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51,727 commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Linus Torvalds
|
e7f24a388e |
Fix x86 boot crash for non-kjump kexecs, by David Woodhouse.
Signed-off-by: Ingo Molnar <mingo@kernel.org> -----BEGIN PGP SIGNATURE----- iQJFBAABCgAvFiEEBpT5eoXrXCwVQwEKEnMQ0APhK1gFAmoJYxcRHG1pbmdvQGtl cm5lbC5vcmcACgkQEnMQ0APhK1j2hA/+MxdlM9As/a/mXpjyqezX2Ja7QsKYcUrD T5IgYi+5mUN3Bu5NYCkjI6jw4L3fAW1k2nLdAglnp9vo0L0McL7rN4pf/v0vUQ2y LEcWr1Oaml15hg3/vBWTOhYVsRoEFqRkrTMQS0hKh7RbEG4bYXeT0Z9oJAjvSzj+ y8bLYzYiJuAM4AqNpiTHns1c2hUXBroooqsqml9+FXL2+kLx+oAP9uwAJk7/b5sI aGHw0XNypM6QBbXHrj/2QfrH1Mxsb6vk21PHKvvukdiZRs8G4zNjrfInB/7Ri8Ob ACdmPrp/U5jxfpmBFhmbsm5Z1wb955n+P3uWQ/8TFkjBLtPpxao3jN7xgRKb4lY4 EjY123XvrWTm2wCF9wyp6L029jWoDTMAR22Dr1THtsssHeZSLFcVp66LIkxoxWJB fjpyNuf4Y800xf6xUNlJ6/irbyhMyuPxOjdgNDoD/mKiWq1+Y2y4K/ILAwXpmzmB xyEp1L2C30K3kquxQ63gyerEAxLux7KF1gRk0KZllf0HK3dEjiWf0B9TyM0E24rt BmUb0WLUy9Tlbojs7qF4Lge2ooLJkKuj+s86ATi6vb20gN/hXvCZJ+/+xF7glRIT 6BBFXKVQ3Vf1sCRBwsDPZoUc1e9mlxHzIyUkFOnjxOp10YCzeUo6h9vo6acPbWYB 7vzHxuJV8cg= =aolN -----END PGP SIGNATURE----- Merge tag 'x86-urgent-2026-05-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 fix from Ingo Molnar: - Fix x86 boot crash for non-kjump kexecs (David Woodhouse) * tag 'x86-urgent-2026-05-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/kexec: Push kjump return address even for non-kjump kexec |
||
|
Linus Torvalds
|
daa3de23f9 |
Fix an MCE polling interval adjustment regression, by Borislav Petkov.
Signed-off-by: Ingo Molnar <mingo@kernel.org> -----BEGIN PGP SIGNATURE----- iQJFBAABCgAvFiEEBpT5eoXrXCwVQwEKEnMQ0APhK1gFAmoJX3QRHG1pbmdvQGtl cm5lbC5vcmcACgkQEnMQ0APhK1iVAQ/+IJNl7oQ8kNHpf3mu4hr0Bl/PAg/V3jSd qNY4QtjA2RnbRvNVVFn0gNnspS/ysTsUKOfBijDsSCEOwZ76FX1JxwLsGjsztxsL EFIvJGMe1sQZ6LbeVvogWiHyjnf98kYtC/NpPQ1gB8jr4splQRunLlvRntAdUbP3 8cCpLCKyxspXWXO+0qyWrVdO1BVNKJJ6zrNQhqh8Qxbk/5Aln51zTloF0lhO51gS YrUgFIsJaNcPwTwS0QIj87H55e4CDyEAoQzzexJroUNLn2DHKIqMt6T3qjy08HtY 0CCsUyFD3CkDsESAM0eIWC7kyWtJjdP8QQKXl5Fdkz2NRuRbiITqDzt0b4HcKzRl CzRZl6eJ2HQDv0EqM9WW2sRc9WFmZ7q+bP06k1iK3xsTzmb9VL+t5oVXhSTFbvKj hHVxlcvmhLWmNCSLlVSUJhe4a90KM2nMf7vl5WS3VMv3J1qjuFIkf4iQtbdqdKDv /ZocfdPjoZgWO8M2tFl6DTqSZOjxxl9ArSCzBJCf7kPEQSBTfUW8u4lLCssaQ/36 pKwAIYNd8U+1SY7Dg6i1l6BfQmsEF71r1NE+8BO4m2xBE8eS3btvRuOXB5JMNlF5 DQSJ/oDKvUfbGUrVNezZh7MNfUmmmiORYIVHMnQYyY2BKjDc0iYL9NtILtqEnbFo ipdGFlOKq24= =XtNx -----END PGP SIGNATURE----- Merge tag 'ras-urgent-2026-05-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull MCE fix from Ingo Molnar: - Fix an MCE polling interval adjustment regression (Borislav Petkov) * tag 'ras-urgent-2026-05-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mce: Restore MCA polling interval halving |
||
|
Linus Torvalds
|
4844e7c4c2 |
xen: branch for v7.1-rc4
-----BEGIN PGP SIGNATURE----- iJEEABYKADkWIQRTLbB6QfY48x44uB6AXGG7T9hjvgUCagcYWxsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQgFxhu0/YY75k0AEAw1PQkrTSg+PYw9/ZSl2h 2W+mZZTS4FqfhyLD7P10dMUBAPc0oGEOxePQqmi5zwROB+nC5dSECoiCkp+Ms2Lr LE4H =LARt -----END PGP SIGNATURE----- Merge tag 'for-linus-7.1b-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip Pull xen fixes from Juergen Gross: - one simple cleanup - a fix for a corner case when running as Xen PV dom0 - a fix of a regression for Xen PV guests, introduced in 7.0 * tag 'for-linus-7.1b-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: x86/xen: Tolerate nested XEN_LAZY_MMU entering/leaving x86/xen: Fix xen_e820_swap_entry_with_ram() xen/arm: Replace __ASSEMBLY__ with __ASSEMBLER__ in interface.h |
||
|
Linus Torvalds
|
48f76a1271 |
ACPI support fixes for 7.1-rc4
- Check ACPI_COMPANION() against NULL during probe in several core
ACPI device drivers (Rafael Wysocki)
- Restore log level of messages in amd_set_max_freq_ratio() (Mario
Limonciello)
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Merge tag 'acpi-7.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI support fixes from Rafael Wysocki:
"These fix several platform drivers that use the ACPI companion of the
given platform device without checking its presence, which may lead to
a NULL pointer dereference or other kind of malfunction if the driver
is forced to match a device without an ACPI companion via driver
override, and restore debug log level for some messages in the ACPI
CPPC library:
- Check ACPI_COMPANION() against NULL during probe in several core
ACPI device drivers (Rafael Wysocki)
- Restore log level of messages in amd_set_max_freq_ratio() (Mario
Limonciello)"
* tag 'acpi-7.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI: PAD: xen: Check ACPI_COMPANION() against NULL
ACPI: driver: Check ACPI_COMPANION() against NULL during probe
Revert "ACPI: CPPC: Adjust debug messages in amd_set_max_freq_ratio() to warn"
|
||
Rafael J. Wysocki
|
af149b667b |
Merge branch 'acpi-cppc'
Merge a revert of an ACPI CPPC commit that increased the log level of some debug messages which turned out to be a bad idea: - Restore log level of messages in amd_set_max_freq_ratio() (Mario Limonciello) * acpi-cppc: Revert "ACPI: CPPC: Adjust debug messages in amd_set_max_freq_ratio() to warn" |
||
Juergen Gross
|
4594437880 |
x86/xen: Tolerate nested XEN_LAZY_MMU entering/leaving
With the support of nested lazy mmu sections it can happen that
arch_enter_lazy_mmu_mode() is being called twice without a call of
arch_leave_lazy_mmu_mode() in between, as the lazy_mmu_*() helpers
are not disabling preemption when checking for nested lazy mmu
sections.
This is a problem when running as a Xen PV guest, as
xen_enter_lazy_mmu() and xen_leave_lazy_mmu() don't tolerate this
case.
Fix that in xen_enter_lazy_mmu() and xen_leave_lazy_mmu() in order
not to hurt all other lazy mmu mode users.
Fixes:
|
||
|
Juergen Gross
|
28e03f78e6 |
x86/xen: Fix xen_e820_swap_entry_with_ram()
When swapping a not page-aligned E820 map entry with RAM, the start
address of the modified entry is calculated wrong (the offset into the
page is subtracted instead of being added to the page address).
Fixes:
|
||
|
Linus Torvalds
|
e1914add27 |
Arm:
* Add the pKVM side of the workaround for ARM's erratum 4193714, provided
that the EL3 firmware does its part of the job. KVM will refuse to
initialise otherwise.
- Correctly handle 52bit VAs for guest EL2 stage-1 translations when
running under NV with E2H==0.
* Correctly deal with permission faults in guest_memfd memslots.
* Fix the steal-time selftest after the infrastructure was reworked.
* Make sure the host cannot pass a non-sensical clock update to the
EL2 tracing infrastructure.
* Appoint Steffen Eiden as a reviewer in anticipation of the KVM/s390
ability to run arm64 guests, which will inevitably lead to arm64
code being directly used on s390.
* Make sure that EL2 is configured with both exception entry and exit
being Context Synchronization Events.
* Handle the current vcpu being NULL on EL2 panic.
* Fix the selftest_vcpu memcache being empty at the point of donation or
sharing.
* Check that the memcache has enough capacity before engaging on the
share/donate path.
* Fix __deactivate_fgt() to use its parameter rather than a variable
in the macro context.
s390:
* Fix array overrun with large amounts of PCI devices.
x86:
* Never use L0's PAUSE loop exiting while L2 is running, since it's
unlikely that a nested guest will help solving the hypervisor's
spinlock contention
* Fix emulation of MOVNTDQA.
* Fix typo in Xen hypercall tracepoint
* Add back an optimization that was left behind when recently
fixing a bug.
* Add module parameter to disable CET, whose implementation seems
to have issues. For now it remains enabled by default.
Generic:
* Reject offset causing an unsigned overflow in kvm_reset_dirty_gfn()
Documentation:
* Update stale links
Selftests:
* Fix guest_memfd_test with host page size > guest page size.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini:
"arm64:
- Add the pKVM side of the workaround for ARM's erratum 4193714,
provided that the EL3 firmware does its part of the job. KVM will
refuse to initialise otherwise
- Correctly handle 52bit VAs for guest EL2 stage-1 translations when
running under NV with E2H==0
- Correctly deal with permission faults in guest_memfd memslots
- Fix the steal-time selftest after the infrastructure was reworked
- Make sure the host cannot pass a non-sensical clock update to the
EL2 tracing infrastructure
- Appoint Steffen Eiden as a reviewer in anticipation of the KVM/s390
ability to run arm64 guests, which will inevitably lead to arm64
code being directly used on s390
- Make sure that EL2 is configured with both exception entry and exit
being Context Synchronization Events
- Handle the current vcpu being NULL on EL2 panic
- Fix the selftest_vcpu memcache being empty at the point of donation
or sharing
- Check that the memcache has enough capacity before engaging on the
share/donate path
- Fix __deactivate_fgt() to use its parameter rather than a variable
in the macro context
s390:
- Fix array overrun with large amounts of PCI devices
x86:
- Never use L0's PAUSE loop exiting while L2 is running, since it's
unlikely that a nested guest will help solving the hypervisor's
spinlock contention
- Fix emulation of MOVNTDQA
- Fix typo in Xen hypercall tracepoint
- Add back an optimization that was left behind when recently fixing
a bug
- Add module parameter to disable CET, whose implementation seems to
have issues. For now it remains enabled by default
Generic:
- Reject offset causing an unsigned overflow in kvm_reset_dirty_gfn()
Documentation:
- Update stale links
Selftests:
- Fix guest_memfd_test with host page size > guest page size"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (22 commits)
KVM: VMX: introduce module parameter to disable CET
KVM: x86: Swap the dst and src operand for MOVNTDQA
KVM: x86: use again the flush argument of __link_shadow_page()
KVM: selftests: Ensure gmem file sizes are multiple of host page size
Documentation: kvm: update links in the references section of AMD Memory Encryption
KVM: nSVM: Never use L0's PAUSE loop exiting while L2 is running
KVM: x86: Fix Xen hypercall tracepoint argument assignment
KVM: Reject wrapped offset in kvm_reset_dirty_gfn()
KVM: arm64: Pre-check vcpu memcache for host->guest donate
KVM: arm64: Pre-check vcpu memcache for host->guest share
KVM: arm64: Seed pkvm_ownership_selftest vcpu memcache
KVM: arm64: Fix __deactivate_fgt macro parameter typo
KVM: arm64: Guard against NULL vcpu on VHE hyp panic path
KVM: arm64: Make EL2 exception entry and exit context-synchronization events
MAINTAINERS: Add Steffen as reviewer for KVM/arm64
KVM: arm64: Remove potential UB on nvhe tracing clock update
KVM: selftests: arm64: Fix steal_time test after UAPI refactoring
KVM: arm64: Handle permission faults with guest_memfd
KVM: arm64: nv: Consider the DS bit when translating TCR_EL2
KVM: arm64: Work around C1-Pro erratum 4193714 for protected guests
...
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Borislav Petkov (AMD)
|
ea324444ec |
x86/mce: Restore MCA polling interval halving
RongQing reported that the MCA polling interval doesn't halve when an
error gets logged. It was traced down to the commit in Fixes:, because:
mce_timer_fn()
|-> mce_poll_banks()
|-> machine_check_poll()
|-> mce_log()
which will queue the work and return.
Now, back in mce_timer_fn():
/*
* Alert userspace if needed. If we logged an MCE, reduce the polling
* interval, otherwise increase the polling interval.
*/
if (mce_notify_irq())
<--- here we haven't ran the notifier chain yet so mce_need_notify is
not set yet so this won't hit and we won't halve the interval iv.
Now the notifier chain runs. mce_early_notifier() sets the bit, does
mce_notify_irq(), that clears the bit and then the notifier chain
a little later logs the error.
So this is a silly timing issue.
But, that's all unnecessary.
All it needs to happen here is, the "should we notify of a logged MCE"
mce_notify_irq() asks, should be simply a question to the mce gen pool:
"Are you empty?"
And that then turns into a simple yes or no answer and it all
JustWorks(tm).
So do that and also distribute the functionality where it belongs:
- Print that MCE events have been logged in mce_log()
- Trigger the mcelog tool specific work in the first notifier
As a result, mce_notify_irq() can go now.
Fixes:
|
||
Paolo Bonzini
|
2d5d3fc593 |
KVM: VMX: introduce module parameter to disable CET
There have been reports of host hangs caused by CET virtualization. Until these are analyzed further, introduce a module parameter that makes it possible to easily disable it. Link: https://lore.kernel.org/all/85548beb-1486-40f9-beb4-632c78e3360b@proxmox.com/ Cc: David Riley <d.riley@proxmox.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
||
Sean Christopherson
|
3098c076c8 |
KVM: x86: Swap the dst and src operand for MOVNTDQA
Swap the MOVNTDQA operands, as MOVNTDQA does NOT in fact have "the same
characteristics as 0F E7 (MOVNTDQ)"; MOVNTDQA loads from memory and stores
to registers, while MOVNTDQ loads from registers and stores to memory.
Per the SDM:
MOVNTDQ - Move packed integer values in xmm1 to m128 using non-temporal
hint.
MOVNTDQA - Move double quadword from m128 to xmm1 using non-temporal hint
if WC memory type.
Reported-by: Josh Eads <josheads@google.com>
Fixes:
|
||
|
Paolo Bonzini
|
6b72d0578c |
KVM: x86: use again the flush argument of __link_shadow_page()
Except in the case of parentless nested-TDP pages, mmu_page_zap_pte() clears the SPTE but leaves the invalid_list empty. In this case, using kvm_flush_remote_tlbs() as kvm_mmu_remote_flush_or_zap() does is overkill. Avoid flushing the entirety of the remote TLBs unless the invalid_list was populated: instead, use a more efficient gfn-targeting flush (if available) and skip it altogether if the caller guarantees that a TLB flush is not necessary. Based-on: <20260503201029.106481-1-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-ID: <20260503210917.121840-1-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
||
|
Sean Christopherson
|
5bd1ddb791 |
KVM: nSVM: Never use L0's PAUSE loop exiting while L2 is running
Never use L0's (KVM's) PAUSE loop exiting controls while L2 is running,
and instead always configure vmcb02 according to L1's exact capabilities
and desires.
The purpose of intercepting PAUSE after N attempts is to detect when the
vCPU may be stuck waiting on a lock, so that KVM can schedule in a
different vCPU that may be holding said lock. Barring a very interesting
setup, L1 and L2 do not share locks, and it's extremely unlikely that an
L1 vCPU would hold a spinlock while running L2. I.e. having a vCPU
executing in L1 yield to a vCPU running in L2 will not allow the L1 vCPU
to make forward progress, and vice versa.
While teaching KVM's "on spin" logic to only yield to other vCPUs in L2 is
doable, in all likelihood it would do more harm than good for most setups.
KVM has limited visibility into which L2 "vCPUs" belong to the same VM,
and thus share a locking domain. And even if L2 vCPUs are in the same
VM, KVM has no visilibity into L2 vCPU's that are scheduled out by the
L1 hypervisor.
Furthermore, KVM doesn't actually steal PAUSE exits from L1. If L1 is
intercepting PAUSE, KVM will route PAUSE exits to L1, not L0, as
nested_svm_intercept() gives priority to the vmcb12 intercept. As such,
overriding the count/threshold fields in vmcb02 with vmcb01's values is
nonsensical, as doing so clobbers all the training/learning that has been
done in L1.
Even worse, if L1 is not intercepting PAUSE, i.e. KVM is handling PAUSE
exits, then KVM will adjust the PLE knobs based on L2 behavior, which could
very well be detrimental to L1, e.g. due to essentially poisoning L1 PLE
training with bad data.
And copying the count from vmcb02 to vmcb01 on a nested VM-Exit makes even
less sense, because again, the purpose of PLE is to detect spinning vCPUs.
Whether or not a vCPU is spinning in L2 at the time of a nested VM-Exit
has no relevance as to the behavior of the vCPU when it executes in L1.
The only scenarios where any of this actually works is if at least one
of KVM or L1 is NOT intercepting PAUSE for the guest. Per the original
changelog, those were the only scenarios considered to be supported.
Disabling KVM's use of PLE makes it so the VM is always in a "supported"
mode.
Last, but certainly not least, using KVM's count/threshold instead of the
values provided by L1 is a blatant violation of the SVM architecture.
Fixes:
|
||
Qiang Ma
|
2b72f1674e |
KVM: x86: Fix Xen hypercall tracepoint argument assignment
TRACE_EVENT(kvm_xen_hypercall) stores a5 in __entry->a4 instead of __entry->a5. That overwrites the recorded a4 argument and leaves a5 unset in the trace entry. Fix the typo so both arguments are captured correctly. Signed-off-by: Qiang Ma <maqianga@uniontech.com> Link: https://patch.msgid.link/20260512015313.1685784-1-maqianga@uniontech.com/ Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
||
Prathyushi Nangia
|
c21b90f776 |
x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
Make sure resources are not improperly shared in the op cache and cause instruction corruption this way. Signed-off-by: Prathyushi Nangia <prathyushi.nangia@amd.com> Co-developed-by: Borislav Petkov (AMD) <bp@alien8.de> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
||
|
Linus Torvalds
|
70390501d1 |
Miscellaneous x86 fixes:
- Fix memory map enumeration bug in the Xen e820 parsing code
(Juergen Gross)
- Re-enable e820 BIOS fallback if e820 table is empty
(David Gow)
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2026-05-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
- Fix memory map enumeration bug in the Xen e820 parsing code (Juergen
Gross)
- Re-enable e820 BIOS fallback if e820 table is empty (David Gow)
* tag 'x86-urgent-2026-05-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/boot/e820: Re-enable BIOS fallback if e820 table is empty
x86/xen: Fix a potential problem in xen_e820_resolve_conflicts()
|
||
|
Linus Torvalds
|
e5cf0260a7 |
Miscellaneous perf events fixes:
- Fix deadlock in the perf_mmap() failure path (Peter Zijlstra)
- Intel ACR (Auto Counter Reload) fixes (Dapeng Mi):
- Fix validation and configuration of ACR masks
- Fix ACR rescheduling bug causing stale masks
- Disable the PMI on ACR-enabled hardware
- Enable ACR on Panther Cover uarch too
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'perf-urgent-2026-05-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf events fixes from Ingo Molnar:
- Fix deadlock in the perf_mmap() failure path (Peter Zijlstra)
- Intel ACR (Auto Counter Reload) fixes (Dapeng Mi):
- Fix validation and configuration of ACR masks
- Fix ACR rescheduling bug causing stale masks
- Disable the PMI on ACR-enabled hardware
- Enable ACR on Panther Cover uarch too
* tag 'perf-urgent-2026-05-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/intel: Enable auto counter reload for DMR
perf/x86/intel: Disable PMI for self-reloaded ACR events
perf/x86/intel: Always reprogram ACR events to prevent stale masks
perf/x86/intel: Improve validation and configuration of ACR masks
perf/core: Fix deadlock in perf_mmap() failure path
|
||
Mario Limonciello
|
db5dadb562 |
Revert "ACPI: CPPC: Adjust debug messages in amd_set_max_freq_ratio() to warn"
Some older systems don't support CPPC in the firmware and this just makes noise for them when booting. Drop back to debug. This reverts commit |
||
David Woodhouse
|
786a45757d |
x86/kexec: Push kjump return address even for non-kjump kexec
The version of purgatory code shipped by kexec-tools attempts to look above
the top of its stack to find a return address for a kjump, even in a non-kjump
kexec.
After the commit in Fixes: the word above the stack might not be there,
leading to a fault (which is at least now caught by my exception-handling code
in kexec).
That commit fixed things for the actual kjump path, but no longer
"gratuitously" pushes the unused return address to the stack in the non-kjump
path. Put that *back* in the non-kjump path, to prevent purgatory from
crashing when trying to access it.
Fixes:
|
||
David Gow
|
5772f65352 |
x86/boot/e820: Re-enable BIOS fallback if e820 table is empty
In commit: |
||
|
Linus Torvalds
|
adc1e5c620 |
EFI fixes for v7.1 #1
- Fix issues in EFI graceful recovery on x86 introduced by changes to the kernel mode FPU APIs - I-cache coherency fixes for the LoongArch EFI stub - Locking fix for EFI pstore - Code tweak for efivarfs -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQQQm/3uucuRGn1Dmh0wbglWLn0tXAUCafml9AAKCRAwbglWLn0t XJSnAQD400URJjhvoFRAkGNEt+ETSGYU03s07wzv8efsfjLCyAEA9gRhsa3D0ArK 21zd5xeLHgeMhLCA5ZkO+HkhFsd8hQk= =45fv -----END PGP SIGNATURE----- Merge tag 'efi-fixes-for-v7.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi Pull EFI fixes from Ard Biesheuvel: - Fix issues in EFI graceful recovery on x86 introduced by changes to the kernel mode FPU APIs - I-cache coherency fixes for the LoongArch EFI stub - Locking fix for EFI pstore - Code tweak for efivarfs * tag 'efi-fixes-for-v7.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: x86/efi: Restore IRQ state in EFI page fault handler x86/efi: Fix graceful fault handling after FPU softirq changes efi/libstub: Synchronize instruction cache after kernel relocation efi/loongarch: Implement efi_cache_sync_image() efi/libstub: Move efi_relocate_kernel() into its only remaining user efi: pstore: Drop efivar lock when efi_pstore_open() returns with an error efivarfs: use QSTR() in efivarfs_alloc_dentry |
||
Dapeng Mi
|
aa4384bc8f |
perf/x86/intel: Enable auto counter reload for DMR
Panther cove µarch starts to support auto counter reload (ACR), but the
static_call intel_pmu_enable_acr_event() is not updated for the Panther
Cove µarch used by DMR. It leads to the auto counter reload is not
really enabled on DMR.
Update static_call intel_pmu_enable_acr_event() in intel_pmu_init_pnc().
Fixes:
|
||
|
Dapeng Mi
|
1271aeccc3 |
perf/x86/intel: Disable PMI for self-reloaded ACR events
On platforms with Auto Counter Reload (ACR) support, such as NVL, a
"NMI received for unknown reason 30" warning is observed when running
multiple events in a group with ACR enabled:
$ perf record -e '{instructions/period=20000,acr_mask=0x2/u,\
cycles/period=40000,acr_mask=0x3/u}' ./test
The warning occurs because the Performance Monitoring Interrupt (PMI)
is enabled for the self-reloaded event (the cycles event in this case).
According to the Intel SDM, the overflow bit
(IA32_PERF_GLOBAL_STATUS.PMCn_OVF) is never set for self-reloaded events.
Since the bit is not set, the perf NMI handler cannot identify the source
of the interrupt, leading to the "unknown reason" message.
Furthermore, enabling PMI for self-reloaded events is unnecessary and
can lead to extraneous records that pollute the user's requested data.
Disable the interrupt bit for all events configured with ACR self-reload.
Fixes:
|
||
|
Dapeng Mi
|
8ba0b706a4 |
perf/x86/intel: Always reprogram ACR events to prevent stale masks
Members of an ACR group are logically linked via a bitmask of their
hardware counter indices. If some members of the group are assigned new
hardware counters during rescheduling, even events that keep their
original counter index must be updated with a new mask.
Without this, an event will continue to use a stale acr_mask that
references the old indices of its group peers. Ensure all ACR events are
reprogrammed during the scheduling path to maintain consistency across
the group.
Fixes:
|
||
|
Dapeng Mi
|
5ad732a56b |
perf/x86/intel: Improve validation and configuration of ACR masks
Currently there are several issues on the user space ACR mask validation
and configuration.
- The validation for user space ACR mask (attr.config2) is incomplete,
e.g., the ACR mask could include the index which belongs to another
ACR events group, but it's not validated.
- An early return on an invalid ACR mask caused all subsequent ACR groups
to be skipped.
- The stale hardware ACR mask (hw.config1) is not cleared before setting
new hardware ACR mask.
The following changes address all of the above issues.
- Figure out the event index group of an ACR group. Any bits in the
user-space mask not present in the index group are now dropped.
- Instead of an early return on invalid bits, drop only the invalid
portions and continue iterating through all ACR events to ensure full
configuration.
- Explicitly clear the stale hardware ACR mask for each event prior to
writing the new configuration.
Besides, a non-leader event member of ACR group could be disabled in
theory. This could cause bit-shifting errors in the acr_mask of remaining
group members. But since ACR sampling requires all events to be active,
this should not be a big concern in real use case. Add a "FIXME" comment
to notice this risk.
Fixes:
|
||
|
Juergen Gross
|
5f87199452 |
x86/xen: Fix a potential problem in xen_e820_resolve_conflicts()
When fixing a conflict in xen_e820_resolve_conflicts(), the loop over
the E820 map entries needs to be restarted, as the E820 map will have
been modified by the fix. Otherwise entries might be skipped by
accident.
Fixes:
|
||
Ard Biesheuvel
|
2c340aab54 |
x86/efi: Restore IRQ state in EFI page fault handler
The kernel's softirq API does not permit re-enabling softirqs while IRQs are disabled. The reason for this is that local_bh_enable() will not only re-enable delivery of softirqs over the back of IRQs, it will also handle any pending softirqs immediately, regardless of whether IRQs are enabled at that point. For this reason, commit |
||
Ivan Hu
|
088f65e206 |
x86/efi: Fix graceful fault handling after FPU softirq changes
Since commit |
||
|
Sean Christopherson
|
0cb2af2ea6 |
KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
The shadow MMU computes GFNs for direct shadow pages using sp->gfn plus the SPTE index. This assumption breaks for shadow paging if the guest page tables are modified between VM entries (similar to commit |
||
|
Sean Christopherson
|
0aec99f9bf |
KVM: x86: Fix misleading variable names and add more comments for PIR=>IRR flow
Rename kvm_apic_update_irr()'s "irr_updated" and vmx_sync_pir_to_irr()'s "got_posted_interrupt" to a more accurate "max_irr_is_from_pir", as neither "irr_updated" nor "got_posted_interrupt" is accurate. __kvm_apic_update_irr() and thus kvm_apic_update_irr() specifically return true if and only if the highest priority IRQ, i.e. max_irr, is a "new" pending IRQ from the PIR. I.e. it's possible for the IRR to be updated, i.e. for a posted IRQ to be "got", *without* the APIs returning true. Expand vmx_sync_pir_to_irr()'s comment to explain why it's necessary to set KVM_REQ_EVENT only if a "new" IRQ was found, and to explain why it's safe to do so only if a new IRQ is also the highest priority pending IRQ. No functional change intended. Signed-off-by: Sean Christopherson <seanjc@google.com> Link: https://patch.msgid.link/20260503201703.108231-3-pbonzini@redhat.com/ Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
||
|
Paolo Bonzini
|
33fd0ccd25 |
KVM: x86: Do IRR scan in __kvm_apic_update_irr even if PIR is empty
Fall back to apic_find_highest_vector() when PID.ON is set but PIR
turns out to be empty, to correctly report the highest pending interrupt
from the existing IRR.
In a nested VM stress test, the following WARNING fires in
vmx_check_nested_events() when kvm_cpu_has_interrupt() reports a pending
interrupt but the subsequent kvm_apic_has_interrupt() (which invokes
vmx_sync_pir_to_irr() again) returns -1:
WARNING: CPU: 99 PID: 57767 at arch/x86/kvm/vmx/nested.c:4449 vmx_check_nested_events+0x6bf/0x6e0 [kvm_intel]
Call Trace:
kvm_check_and_inject_events
vcpu_enter_guest.constprop.0
vcpu_run
kvm_arch_vcpu_ioctl_run
kvm_vcpu_ioctl
__x64_sys_ioctl
do_syscall_64
entry_SYSCALL_64_after_hwframe
The root cause is a race between vmx_sync_pir_to_irr() on the target vCPU
and __vmx_deliver_posted_interrupt() on a sender vCPU. The sender
performs two individually-atomic operations that are not a single
transaction:
1. pi_test_and_set_pir(vector) -- sets the PIR bit
2. pi_test_and_set_on() -- sets PID.ON
The following interleaving triggers the bug:
Sender vCPU (IPI): Target vCPU (1st sync_pir_to_irr):
B1: set PIR[vector]
A1: pi_clear_on()
A2: pi_harvest_pir() -> sees B1 bit
A3: xchg() -> consumes bit, PIR=0
(1st sync returns correct max_irr)
B2: set PID.ON = 1
Target vCPU (2nd sync_pir_to_irr):
C1: pi_test_on() -> TRUE (from B2)
C2: pi_clear_on() -> ON=0
C3: pi_harvest_pir() -> PIR empty
C4: *max_irr = -1, early return
IRR NOT SCANNED
The interrupt is not lost (it resides in the IRR from the first sync and
is recovered on the next vcpu_enter_guest() iteration), but the incorrect
max_irr causes a spurious WARNING and a wasted L2 VM-Enter/VM-Exit cycle.
Fixes:
|
||
|
Paolo Bonzini
|
464af6fc2b |
KVM: x86: check for nEPT/nNPT in slow flush hypercalls
Checking is_guest_mode(vcpu) is incorrect, because translate_nested_gpa()
is only valid if an L2 guest is running *with nested EPT/NPT enabled*.
Instead use the same condition as translate_nested_gpa() itself.
Cc: stable@vger.kernel.org
Reviewed-by: Sean Christopherson <seanjc@google.com>
Fixes:
|
||
|
Linus Torvalds
|
8f4e8687c8 |
Miscellaneous x86 fixes:
- Prevent deadlock during shstk sigreturn (Rick Edgecombe)
- Disable FRED when PTI is forced on (Dave Hansen)
- Revert a CPA INVLPGB optimization that did not properly handle
discontiguous virtual addresses (Dave Hansen)
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2026-04-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
- Prevent deadlock during shstk sigreturn (Rick Edgecombe)
- Disable FRED when PTI is forced on (Dave Hansen)
- Revert a CPA INVLPGB optimization that did not properly handle
discontiguous virtual addresses (Dave Hansen)
* tag 'x86-urgent-2026-04-24' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mm: Revert INVLPGB optimization for set_memory code
x86/cpu: Disable FRED when PTI is forced on
x86/shstk: Prevent deadlock during shstk sigreturn
|
||
Dave Hansen
|
a39a701482 |
x86/mm: Revert INVLPGB optimization for set_memory code
tl;dr: Revert an INVLPGB optimization that did not properly handle discontiguous virtual addresses. Full story: I got a report from some graphics (i915) folks that bisected a regression in their test suite to |
||
|
Linus Torvalds
|
45dcf5e288 |
PCMCIA fixes and cleanups for v7.1
A number of minor PCMCIA bugfixes and cleanups, and a patch removing obsolete host controller drivers. -----BEGIN PGP SIGNATURE----- iQJPBAABCgA5FiEEmgXaWKgmjrvkPhLCmpdgiUyNow0FAmnqWwIbHGxpbnV4QGRv bWluaWticm9kb3dza2kubmV0AAoJEJqXYIlMjaMNifYP/R89OwUCazfebvE+mzTT Nlj11sxOaMF9ZMDkWZlP49TkoBZjQ9MEb6hGgw99SLLf5bYoHQFHZ0RMIwM/7UXv y66ZLqfuGgdenUre8QROsYP1uegO4gh41aRm9a7cswoAkNlnIgKhH1k2/jhRwlXT rrl2CObgkdAtpnZDb2GFyjL2Y5VEKoKJf3nrNlDs1R4NBDVmfisojlfLeYFGGBsq CESwNcj9eEj+NuUhdWOmHXjXOvsDxk2PpTUEettswcdInOj8MApScbmyj/UqCX6A RTI/myAeLeGTMgTrZCfIqhCiaZbBdVcoKYakRfAZVyM1KuHQo/PmAlMPhv5C4lRT V8Fqz3RTtcYxblTMoxWh8pMaCKoH905YIINs54rkFwAqgq6TXgu26QdZtH+YR2V/ /0JI613MfSDhC2WwEF3j+sW0WlCnGSFZ5yzUZQmoQYf4US3ZOhp1JgaK+18QtqUa 00e0OQkLNN03Nj7UcoMfLHANOBVjLV8C8U+zkHT1t5AI4bRlP8FSTNrFP0f2VKWZ rm0S7CWovRS9mewOOXVHv2Wo0bxSaBsBxrD2G8n1PRE96xpXZvjuUKQtSyX6Totk lacS2HziABD7IiuKH0djC1MPPZkbZcct3TO8PggVYkrDa9nyQAsG4Z2+S85f8+Qg ALVHDj4B4bbJEVyn4duU9y+F =y3cK -----END PGP SIGNATURE----- Merge tag 'pcmcia-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux Pull PCMCIA updates from Dominik Brodowski: "A number of minor PCMCIA bugfixes and cleanups, and a patch removing obsolete host controller drivers" * tag 'pcmcia-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux: pcmcia: remove obsolete host controller drivers pcmcia: Convert to use less arguments in pci_bus_for_each_resource() PCMCIA: Fix garbled log messages for KERN_CONT |
||
|
Linus Torvalds
|
38ee6e1fb6 |
kgdb patches for 7.1
Only a very small update for kgdb this cycle: a single patch from Kexin Sun that fixes some outdated comments. Signed-off-by: Daniel Thompson (RISCstar) <danielt@kernel.org> -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEELzVBU1D3lWq6cKzwfOMlXTn3iKEFAmno2OcACgkQfOMlXTn3 iKHVNw/+IXsSmpUTllkwlzmib+D7zYVEoyLOdoBRQyJDjjT9Qe811budkIs02sIk NUgMBnffInU73lCw2TbRpKag9+dl8ZglKFvM3UpElFzY5ePnUc/fHeFtsXdzVjSK PVzL3fCtN66R1MuMeCdMNjhtSVHNJCrclj0We39JRgli7kWK1zH6kY8X/j/ExBTR 9S5e3/9Yn/V9Z2Z33lwBMCKLHyd/5r0ezKbvfVGmqT/sTE/IbTcTfVMipEHGtHfA JHs5PC+1obJ9jeq/1c1fV8tZ8kO+VjGI0yUibbWEBmPx0pVUW/FG1z+WwhlbcyOl cyhKQ7d4h4e718M+bWAXeoRGk9bXyAWHqWojM98Xh+TvR2H20qAzUC44qeT9tt7B SOfvZM4Xwsn+uYqmthtMqLMqe8VIX2WbUVjsntYZ46fRTq8RAUY3z7yLv6bm7N4l p4i7/cdCsbzi+tN6uaKANywvt9ygEAcPILGfMhfIS4Pa7aQ/JVjKgxKhP1bUuH9u ftqIcJwvX3d8MDQY4FsLpsRToj3rADfr35HnQCc7fmqRIFi7++fXzPerktdF/5Sd 6NMR0+mdFewdW9JfYKGZMTybf9XXyC+F6HlKgNOBddPje7qQlLUIQBajn71W753i TNKI5Go6idMgWEukNVXGD2XqObyKD2eBgCj/42Kc8bDfo7D66UA= =MegD -----END PGP SIGNATURE----- Merge tag 'kgdb-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux Pull kgdb update from Daniel Thompson: "Only a very small update for kgdb this cycle: a single patch from Kexin Sun that fixes some outdated comments" * tag 'kgdb-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux: kgdb: update outdated references to kgdb_wait() |
||
|
Linus Torvalds
|
2a4c0c11c0 |
s390 updates for 7.1 merge window
- Add support for CONFIG_PAGE_TABLE_CHECK and enable it in debug_defconfig. s390 can only tell user from kernel PTEs via the mm, so mm_struct is now passed into pxx_user_accessible_page() callbacks - Expose the PCI function UID as an arch-specific slot attribute in sysfs so a function can be identified by its user-defined id while still in standby. Introduces a generic ARCH_PCI_SLOT_GROUPS hook in drivers/pci/slot.c - Refresh s390 PCI documentation to reflect current behavior and cover previously undocumented sysfs attributes - zcrypt device driver cleanup series: consistent field types, clearer variable naming, a kernel-doc warning fix, and a comment explaining the intentional synchronize_rcu() in pkey_handler_register() - Provide an s390 arch_raw_cpu_ptr() that avoids the detour via get_lowcore() using alternatives, shrinking defconfig by ~27 kB - Guard identity-base randomization with kaslr_enabled() so nokaslr keeps the identity mapping at 0 even with CONFIG_RANDOMIZE_IDENTITY_BASE=y - Build S390_MODULES_SANITY_TEST as a module only by requiring KUNIT && m, since built-in would not exercise module loading - Remove the permanently commented-out HMCDRV_DEV_CLASS create_class() code in the hmcdrv driver - Drop stale ident_map_size extern conflicting with asm/page.h -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEE3QHqV+H2a8xAv27vjYWKoQLXFBgFAmno78kACgkQjYWKoQLX FBiHbggAmW5hPIDf4F8HLomMREaaQb7QAyYwfeefwhcFUXSMu8td8S68aN4UkOnS DGSFjb+V6Nqd+ewrF7IS9pRU9YFsmBqo3MnLdcJ/ojZFz8BlwoAi+E4AD1a38hY2 9zh2siPBMjydqBRUn6zjsK8auk4e8r44iS5MNNMXDF2ePE/PnPKTm93GhbtnnM6r a7mQkiPbi6j0sN/UU+pQkhS4fm2XNaGpCGGX0W0v2RdLIYZ9zQQdg4TaEsjQ5wZA OC3P8LG3OyJjnxsY2J8PIKK0VM0JP67KUGnQOi1y8HbN1LkFfAWF6CK7tsyUE/JM TYg7ENs2mUMmaa8niOGkiXzjjAxD0g== =NpmP -----END PGP SIGNATURE----- Merge tag 's390-7.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Vasily Gorbik: - Add support for CONFIG_PAGE_TABLE_CHECK and enable it in debug_defconfig. s390 can only tell user from kernel PTEs via the mm, so mm_struct is now passed into pxx_user_accessible_page() callbacks - Expose the PCI function UID as an arch-specific slot attribute in sysfs so a function can be identified by its user-defined id while still in standby. Introduces a generic ARCH_PCI_SLOT_GROUPS hook in drivers/pci/slot.c - Refresh s390 PCI documentation to reflect current behavior and cover previously undocumented sysfs attributes - zcrypt device driver cleanup series: consistent field types, clearer variable naming, a kernel-doc warning fix, and a comment explaining the intentional synchronize_rcu() in pkey_handler_register() - Provide an s390 arch_raw_cpu_ptr() that avoids the detour via get_lowcore() using alternatives, shrinking defconfig by ~27 kB - Guard identity-base randomization with kaslr_enabled() so nokaslr keeps the identity mapping at 0 even with RANDOMIZE_IDENTITY_BASE=y - Build S390_MODULES_SANITY_TEST as a module only by requiring KUNIT && m, since built-in would not exercise module loading - Remove the permanently commented-out HMCDRV_DEV_CLASS create_class() code in the hmcdrv driver - Drop stale ident_map_size extern conflicting with asm/page.h * tag 's390-7.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/zcrypt: Fix warning about wrong kernel doc comment PCI: s390: Expose the UID as an arch specific PCI slot attribute docs: s390/pci: Improve and update PCI documentation s390/pkey: Add comment about synchronize_rcu() to pkey base s390/hmcdrv: Remove commented out code s390/zcrypt: Slight rework on the agent_id field s390/zcrypt: Explicitly use a card variable in _zcrypt_send_cprb s390/zcrypt: Rework MKVP fields and handling s390/zcrypt: Make apfs a real unsigned int field s390/zcrypt: Rework domain processing within zcrypt device driver s390/zcrypt: Move inline function rng_type6cprb_msgx from header to code s390/percpu: Provide arch_raw_cpu_ptr() s390: Enable page table check for debug_defconfig s390/pgtable: Add s390 support for page table check s390/pgtable: Use set_pmd_bit() to invalidate PMD entry mm/page_table_check: Pass mm_struct to pxx_user_accessible_page() s390/boot: Respect kaslr_enabled() for identity randomization s390/Kconfig: Make modules sanity test a module-only option s390/setup: Drop stale ident_map_size declaration |
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|
Linus Torvalds
|
8fd12b03c7 |
hyperv-next for v7.1
-----BEGIN PGP SIGNATURE----- iQFHBAABCgAxFiEEIbPD0id6easf0xsudhRwX5BBoF4FAmnobFATHHdlaS5saXVA a2VybmVsLm9yZwAKCRB2FHBfkEGgXhafB/wMvf8yu4FgapbSRIlPboeW/ONDyuHd k0y1a0IFMQLspWfCxK8+snEcHT3g9xzG3ksqcnac0SPgzqxQ4dlK/c7Xr+5EBXuf TEt/bHrt6KT5BUpb1k/XxcdoObCsvZd3vfqR020OsHijw1Ni9PrdqeZxk56/vFJs nvgyKvsrAEyfALOH1Vgwg0gNWpqJBj1KcT3Kl1o4p5lwQzVpUREZii6RyvgXT/pu mckN63FrEPOpDaJllHmCPcfFSzqNi+wFQcFxm35w9rDQsVdnMsRWoJbcXNYW5QGM +KOZ1/tzw4Z3queW78hcxsH6sXiElLDsJgtDohBhxbVvUXy+xHrJCOm5 =4Ke3 -----END PGP SIGNATURE----- Merge tag 'hyperv-next-signed-20260421' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux Pull Hyper-V updates from Wei Liu: - Fix cross-compilation for hv tools (Aditya Garg) - Fix vmemmap_shift exceeding MAX_FOLIO_ORDER in mshv_vtl (Naman Jain) - Limit channel interrupt scan to relid high water mark (Michael Kelley) - Export hv_vmbus_exists() and use it in pci-hyperv (Dexuan Cui) - Fix cleanup and shutdown issues for MSHV (Jork Loeser) - Introduce more tracing support for MSHV (Stanislav Kinsburskii) * tag 'hyperv-next-signed-20260421' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: x86/hyperv: Skip LP/VP creation on kexec x86/hyperv: move stimer cleanup to hv_machine_shutdown() Drivers: hv: vmbus: fix hyperv_cpuhp_online variable shadowing mshv: Add tracepoint for GPA intercept handling mshv_vtl: Fix vmemmap_shift exceeding MAX_FOLIO_ORDER tools: hv: Fix cross-compilation Drivers: hv: vmbus: Export hv_vmbus_exists() and use it in pci-hyperv mshv: Introduce tracing support Drivers: hv: vmbus: Limit channel interrupt scan to relid high water mark |
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Jork Loeser
|
5170a82e89 |
x86/hyperv: Skip LP/VP creation on kexec
After a kexec the logical processors and virtual processors already exist in the hypervisor because they were created by the previous kernel. Attempting to add them again causes either a BUG_ON or corrupted VP state leading to MCEs in the new kernel. Add hv_lp_exists() to probe whether an LP is already present by calling HVCALL_GET_LOGICAL_PROCESSOR_RUN_TIME. When it succeeds the LP exists and we skip the add-LP and create-VP loops entirely. Also add hv_call_notify_all_processors_started() which informs the hypervisor that all processors are online. This is required after adding LPs (fresh boot) and is a no-op on kexec since we skip that path. Co-developed-by: Anirudh Rayabharam <anrayabh@linux.microsoft.com> Signed-off-by: Anirudh Rayabharam <anrayabh@linux.microsoft.com> Co-developed-by: Stanislav Kinsburskii <stanislav.kinsburskii@gmail.com> Signed-off-by: Stanislav Kinsburskii <stanislav.kinsburskii@gmail.com> Co-developed-by: Mukesh Rathor <mrathor@linux.microsoft.com> Signed-off-by: Mukesh Rathor <mrathor@linux.microsoft.com> Signed-off-by: Jork Loeser <jloeser@linux.microsoft.com> Reviewed-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com> Signed-off-by: Wei Liu <wei.liu@kernel.org> |
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Jork Loeser
|
f7ce370b52 |
x86/hyperv: move stimer cleanup to hv_machine_shutdown()
Move hv_stimer_global_cleanup() from vmbus's hv_kexec_handler() to hv_machine_shutdown() in the platform code. This ensures stimer cleanup happens before the vmbus unload, which is required for root partition kexec to work correctly. Co-developed-by: Anirudh Rayabharam <anrayabh@linux.microsoft.com> Signed-off-by: Anirudh Rayabharam <anrayabh@linux.microsoft.com> Signed-off-by: Jork Loeser <jloeser@linux.microsoft.com> Reviewed-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com> Signed-off-by: Wei Liu <wei.liu@kernel.org> |
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Dave Hansen
|
932d922285 |
x86/cpu: Disable FRED when PTI is forced on
FRED and PTI were never intended to work together. No FRED hardware is vulnerable to Meltdown and all of it should have LASS anyway. Nevertheless, if you boot a system with pti=on and fred=on, the kernel tries to do what is asked of it and dies a horrible death on the first attempt to run userspace (since it never switches to the user page tables). Disable FRED when PTI is forced on, and print a warning about it. A quick brain dump about what a FRED+PTI implementation would look like is below. I'm not sure it would make any sense to do it, but never say never. All I know is that it's way too complicated to be worth it today. <brain dump> The SWITCH_TO_USER/KERNEL_CR3 bits are simple to fix (or at least we have the assembly tools to do it already), as is sticking the FRED entry text in .entry.text (it's not in there today). The nasty part is the stacks. Today, the CPU pops into the kernel on MSR_IA32_FRED_RSP0 which is normal old kernel memory and not mapped to userspace. The hardware pushes gunk on to MSR_IA32_FRED_RSP0, which is currently the task stacks. MSR_IA32_FRED_RSP0 would need to point elsewhere, probably cpu_entry_stack(). Then, start playing games with stacks on entry/exit, including copying gunk to and from the task stack. While I'd *like* to have PTI everywhere, I'm not sure it's worth mucking up the FRED code with PTI kludges. If a user wants fast entry/exit, they use FRED. If you want PTI (and sekuritay), you certainly don't care about fast entry and FRED isn't going to help you *all* that much, so you can just stay with the IDT. Plus, FRED hardware should have LASS which gives you a similar security profile to PTI without the CR3 munging. </brain dump> Reported-by: Gayatri Kammela <Gayatri.Kammela@amd.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de> Tested-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com> Cc:stable@vger.kernel.org Link: https://patch.msgid.link/20260421163136.E7C6788A@davehans-spike.ostc.intel.com |
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Kexin Sun
|
256e5254ef |
kgdb: update outdated references to kgdb_wait()
The function kgdb_wait() was folded into the static function
kgdb_cpu_enter() by commit
|
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Linus Torvalds
|
065c4e67cc |
Mostly cleanups and small things, notably:
- musl libc compatibility - vDSO installation fix - TLB sync race fix for recent SMP support - build fix for 32-bit with Clang 20/21 -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEpeA8sTs3M8SN2hR410qiO8sPaAAFAmnmKS4ACgkQ10qiO8sP aAD2+w//dOOblgUYgQJUXIxHpS7Gcb3Tm+a7ujC23q/kWf/pc8milCSf+zoxzUXL 23Vwh4Gt4KrHKp8lG1gU3xZqV0qwhXNi5HO2hMpB0ioIVpX3TcrUhFbp/Oirvhgi 3PvnvsFtUlW82DFgewB98tefXZSAlG/pg+RjQ3weHfEo+xQbjYc+kR8o59tN8LNR Ea4rrxyjsr3KN2yBNaFpDkMchudP6XWgKByAZBxZ2FofC3zuVRCyF8ThDfQl/3/W muSqX+2iuKjGpmxV0XWt72hYOhNYjBtDY7f4EPe6sbUy+PU6SjD9h/s7VTyVHgZR 3Sii9AQLLJNYPoglExMfmWfeUnJCUJNNTLUze+ZtnhURZQYTvyJRzVmKj6fDPjK2 jGEKXanfZCK9Cfgy2f2xbQxCxhAVwz6QT0XaQO2dZBXa0anzG+2HM0Zn8MNa9jbU +Lm11k1jd1QBifr+5zeni98KHt2mf77blCny8TraODgLNgWUVi5kMkPF4bZgD4Qj udMU9lOkTD08R89hG/Le9TsB+NIpPauyNxDHUpC/VDterFdZqFvmOFT6afTo/4RZ nXNVdL1tn+7O7v0bLdbyhXwj2her1GDbe6HZ5eTNqmjcOthcgI3gF2stDfFhEbNb /wMHnpGPncMeEI8YWtWOFA4FA5T32+LafLCKhuRJdaw0+f/NMOo= =oovZ -----END PGP SIGNATURE----- Merge tag 'uml-for-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux Pull uml updates from Johannes Berg: "Mostly cleanups and small things, notably: - musl libc compatibility - vDSO installation fix - TLB sync race fix for recent SMP support - build fix for 32-bit with Clang 20/21" * tag 'uml-for-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: um: Disable GCOV_PROFILE_ALL on 32-bit UML with Clang 20/21 um: drivers: call kernel_strrchr() explicitly in cow_user.c um: Replace strncpy() with strnlen()+memcpy_and_pad() in strncpy_chunk_from_user() x86/um: fix vDSO installation um: Remove CONFIG_FRAME_WARN from x86_64_defconfig um: Fix pte_read() and pte_exec() for kernel mappings um: Fix potential race condition in TLB sync um: time-travel: clean up kernel-doc warnings um: avoid struct sigcontext redefinition with musl um: fix address-of CMSG_DATA() rvalue in stub |
||
Rick Edgecombe
|
9874b2917b |
x86/shstk: Prevent deadlock during shstk sigreturn
During sigreturn the shadow stack signal frame is popped. The kernel does
this by reading the shadow stack using normal read accesses. When it can't
assume the memory is shadow stack, it takes extra steps to makes sure it is
reading actual shadow stack memory and not other normal readable memory. It
does this by holding the mmap read lock while doing the access and checking
the flags of the VMA.
Unfortunately that is not safe. If the read of the shadow stack sigframe
hits a page fault, the fault handler will try to recursively grab another
mmap read lock. This normally works ok, but if a writer on another CPU is
also waiting, the second read lock could fail and cause a deadlock.
Fix this by not holding mmap lock during the read access to userspace.
Instead use mmap_lock_speculate_...() to watch for changes between dropping
mmap lock and the userspace access. Retry if anything grabbed an mmap write
lock in between and could have changed the VMA.
These mmap_lock_speculate_...() helpers use mm::mm_lock_seq, which is only
available when PER_VMA_LOCK is configured. So make X86_USER_SHADOW_STACK
depend on it. On x86, PER_VMA_LOCK is a default configuration for SMP
kernels. So drop support for the other configs under the assumption that
the !SMP shadow stack user base does not exist.
Currently there is a check that skips the lookup work when the SSP can be
assumed to be on a shadow stack. While reorganizing the function, remove
the optimization to make the tricky code flows more common, such that
issues like this cannot escape detection for so long.
Fixes:
|
||
|
Linus Torvalds
|
9055c64567 |
memblock: updates for 7.0-rc1
* improve debugability of reserve_mem kernel parameter handling with print outs in case of a failure and debugfs info showing what was actually reserved * Make memblock_free_late() and free_reserved_area() use the same core logic for freeing the memory to buddy and ensure it takes care of updating memblock arrays when ARCH_KEEP_MEMBLOCK is enabled. -----BEGIN PGP SIGNATURE----- iQFEBAABCgAuFiEEeOVYVaWZL5900a/pOQOGJssO/ZEFAmnjRmsQHHJwcHRAa2Vy bmVsLm9yZwAKCRA5A4Ymyw79kYh0CAC4NpZGFqpEBep1eQcfqsPH05dvp1LUXDNk i5GwS2ht/F5D9GcD+EyoYRQjRM8k+XZyOe3sqEF01Uav/rHAv3XrITg/pfiA92AR K7CvQv4NvyQqUNcv/mEb+P8niriJ4oHRXCag9inop1jo/x3Mym07oEy73rknAx9r ZQKwoFNOM/QQGVb9hZUANKCkE8cAsUXG89yEOH0n17FOahC0PZbK/vxjeO+br3IL HxEoC5l1j4cUauf8XEhsVXXdch0iqit/fB3ROePYFNCx7koVYHk6Yl1w++AM0RUA ypOmfPsSiqLY2ciuTIAnpTeMfQkkhEmMI3mp6T5BUBwSKJxLRaSM =c1xd -----END PGP SIGNATURE----- Merge tag 'memblock-v7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock Pull memblock updates from Mike Rapoport: - improve debuggability of reserve_mem kernel parameter handling with print outs in case of a failure and debugfs info showing what was actually reserved - Make memblock_free_late() and free_reserved_area() use the same core logic for freeing the memory to buddy and ensure it takes care of updating memblock arrays when ARCH_KEEP_MEMBLOCK is enabled. * tag 'memblock-v7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock: x86/alternative: delay freeing of smp_locks section memblock: warn when freeing reserved memory before memory map is initialized memblock, treewide: make memblock_free() handle late freeing memblock: make free_reserved_area() update memblock if ARCH_KEEP_MEMBLOCK=y memblock: extract page freeing from free_reserved_area() into a helper memblock: make free_reserved_area() more robust mm: move free_reserved_area() to mm/memblock.c powerpc: opal-core: pair alloc_pages_exact() with free_pages_exact() powerpc: fadump: pair alloc_pages_exact() with free_pages_exact() memblock: reserve_mem: fix end caclulation in reserve_mem_release_by_name() memblock: move reserve_bootmem_range() to memblock.c and make it static memblock: Add reserve_mem debugfs info memblock: Print out errors on reserve_mem parser |
||
|
Linus Torvalds
|
eb0d6d97c2 |
bpf-fixes
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Merge tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf
Pull bpf fixes from Alexei Starovoitov:
"Most of the diff stat comes from Xu Kuohai's fix to emit ENDBR/BTI,
since all JITs had to be touched to move constant blinding out and
pass bpf_verifier_env in.
- Fix use-after-free in arena_vm_close on fork (Alexei Starovoitov)
- Dissociate struct_ops program with map if map_update fails (Amery
Hung)
- Fix out-of-range and off-by-one bugs in arm64 JIT (Daniel Borkmann)
- Fix precedence bug in convert_bpf_ld_abs alignment check (Daniel
Borkmann)
- Fix arg tracking for imprecise/multi-offset in BPF_ST/STX insns
(Eduard Zingerman)
- Copy token from main to subprogs to fix missing kallsyms (Eduard
Zingerman)
- Prevent double close and leak of btf objects in libbpf (Jiri Olsa)
- Fix af_unix null-ptr-deref in sockmap (Michal Luczaj)
- Fix NULL deref in map_kptr_match_type for scalar regs (Mykyta
Yatsenko)
- Avoid unnecessary IPIs. Remove redundant bpf_flush_icache() in
arm64 and riscv JITs (Puranjay Mohan)
- Fix out of bounds access. Validate node_id in arena_alloc_pages()
(Puranjay Mohan)
- Reject BPF-to-BPF calls and callbacks in arm32 JIT (Puranjay Mohan)
- Refactor all JITs to pass bpf_verifier_env to emit ENDBR/BTI for
indirect jump targets on x86-64, arm64 JITs (Xu Kuohai)
- Allow UTF-8 literals in bpf_bprintf_prepare() (Yihan Ding)"
* tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf: (32 commits)
bpf, arm32: Reject BPF-to-BPF calls and callbacks in the JIT
bpf: Dissociate struct_ops program with map if map_update fails
bpf: Validate node_id in arena_alloc_pages()
libbpf: Prevent double close and leak of btf objects
selftests/bpf: cover UTF-8 trace_printk output
bpf: allow UTF-8 literals in bpf_bprintf_prepare()
selftests/bpf: Reject scalar store into kptr slot
bpf: Fix NULL deref in map_kptr_match_type for scalar regs
bpf: Fix precedence bug in convert_bpf_ld_abs alignment check
bpf, arm64: Emit BTI for indirect jump target
bpf, x86: Emit ENDBR for indirect jump targets
bpf: Add helper to detect indirect jump targets
bpf: Pass bpf_verifier_env to JIT
bpf: Move constants blinding out of arch-specific JITs
bpf, sockmap: Take state lock for af_unix iter
bpf, sockmap: Fix af_unix null-ptr-deref in proto update
selftests/bpf: Extend bpf_iter_unix to attempt deadlocking
bpf, sockmap: Fix af_unix iter deadlock
bpf, sockmap: Annotate af_unix sock:: Sk_state data-races
selftests/bpf: verify kallsyms entries for token-loaded subprograms
...
|
||
|
Linus Torvalds
|
9cdca33667 |
integrity-v7.1
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Merge tag 'integrity-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity
Pull integrity updates from Mimi Zohar:
"There are two main changes, one feature removal, some code cleanup,
and a number of bug fixes.
Main changes:
- Detecting secure boot mode was limited to IMA. Make detecting
secure boot mode accessible to EVM and other LSMs
- IMA sigv3 support was limited to fsverity. Add IMA sigv3 support
for IMA regular file hashes and EVM portable signatures
Remove:
- Remove IMA support for asychronous hash calculation originally
added for hardware acceleration
Cleanup:
- Remove unnecessary Kconfig CONFIG_MODULE_SIG and CONFIG_KEXEC_SIG
tests
- Add descriptions of the IMA atomic flags
Bug fixes:
- Like IMA, properly limit EVM "fix" mode
- Define and call evm_fix_hmac() to update security.evm
- Fallback to using i_version to detect file change for filesystems
that do not support STATX_CHANGE_COOKIE
- Address missing kernel support for configured (new) TPM hash
algorithms
- Add missing crypto_shash_final() return value"
* tag 'integrity-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity:
evm: Enforce signatures version 3 with new EVM policy 'bit 3'
integrity: Allow sigv3 verification on EVM_XATTR_PORTABLE_DIGSIG
ima: add support to require IMA sigv3 signatures
ima: add regular file data hash signature version 3 support
ima: Define asymmetric_verify_v3() to verify IMA sigv3 signatures
ima: remove buggy support for asynchronous hashes
integrity: Eliminate weak definition of arch_get_secureboot()
ima: Add code comments to explain IMA iint cache atomic_flags
ima_fs: Correctly create securityfs files for unsupported hash algos
ima: check return value of crypto_shash_final() in boot aggregate
ima: Define and use a digest_size field in the ima_algo_desc structure
powerpc/ima: Drop unnecessary check for CONFIG_MODULE_SIG
ima: efi: Drop unnecessary check for CONFIG_MODULE_SIG/CONFIG_KEXEC_SIG
ima: fallback to using i_version to detect file change
evm: fix security.evm for a file with IMA signature
s390: Drop unnecessary CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT
evm: Don't enable fix mode when secure boot is enabled
integrity: Make arch_ima_get_secureboot integrity-wide
|
||
|
Linus Torvalds
|
01f492e181 |
Arm:
- Add support for tracing in the standalone EL2 hypervisor code, which should help both debugging and performance analysis. This uses the new infrastructure for 'remote' trace buffers that can be exposed by non-kernel entities such as firmware, and which came through the tracing tree. - Add support for GICv5 Per Processor Interrupts (PPIs), as the starting point for supporting the new GIC architecture in KVM. - Finally add support for pKVM protected guests, where pages are unmapped from the host as they are faulted into the guest and can be shared back from the guest using pKVM hypercalls. Protected guests are created using a new machine type identifier. As the elusive guestmem has not yet delivered on its promises, anonymous memory is also supported. This is only a first step towards full isolation from the host; for example, the CPU register state and DMA accesses are not yet isolated. Because this does not really yet bring fully what it promises, it is hidden behind CONFIG_ARM_PKVM_GUEST + 'kvm-arm.mode=protected', and also triggers TAINT_USER when a VM is created. Caveat emptor. - Rework the dreaded user_mem_abort() function to make it more maintainable, reducing the amount of state being exposed to the various helpers and rendering a substantial amount of state immutable. - Expand the Stage-2 page table dumper to support NV shadow page tables on a per-VM basis. - Tidy up the pKVM PSCI proxy code to be slightly less hard to follow. - Fix both SPE and TRBE in non-VHE configurations so that they do not generate spurious, out of context table walks that ultimately lead to very bad HW lockups. - A small set of patches fixing the Stage-2 MMU freeing in error cases. - Tighten-up accepted SMC immediate value to be only #0 for host SMCCC calls. - The usual cleanups and other selftest churn. LoongArch: - Use CSR_CRMD_PLV for kvm_arch_vcpu_in_kernel(). - Add DMSINTC irqchip in kernel support. RISC-V: - Fix steal time shared memory alignment checks - Fix vector context allocation leak - Fix array out-of-bounds in pmu_ctr_read() and pmu_fw_ctr_read_hi() - Fix double-free of sdata in kvm_pmu_clear_snapshot_area() - Fix integer overflow in kvm_pmu_validate_counter_mask() - Fix shift-out-of-bounds in make_xfence_request() - Fix lost write protection on huge pages during dirty logging - Split huge pages during fault handling for dirty logging - Skip CSR restore if VCPU is reloaded on the same core - Implement kvm_arch_has_default_irqchip() for KVM selftests - Factored-out ISA checks into separate sources - Added hideleg to struct kvm_vcpu_config - Factored-out VCPU config into separate sources - Support configuration of per-VM HGATP mode from KVM user space s390: - Support for ESA (31-bit) guests inside nested hypervisors. - Remove restriction on memslot alignment, which is not needed anymore with the new gmap code. - Fix LPSW/E to update the bear (which of course is the breaking event address register). x86: - Shut up various UBSAN warnings on reading module parameter before they were initialized. - Don't zero-allocate page tables that are used for splitting hugepages in the TDP MMU, as KVM is guaranteed to set all SPTEs in the page table and thus write all bytes. - As an optimization, bail early when trying to unsync 4KiB mappings if the target gfn can just be mapped with a 2MiB hugepage. x86 generic: - Copy single-chunk MMIO write values into struct kvm_vcpu (more precisely struct kvm_mmio_fragment) to fix use-after-free stack bugs where KVM would dereference stack pointer after an exit to userspace. - Clean up and comment the emulated MMIO code to try to make it easier to maintain (not necessarily "easy", but "easier"). - Move VMXON+VMXOFF and EFER.SVME toggling out of KVM (not *all* of VMX and SVM enabling) as it is needed for trusted I/O. - Advertise support for AVX512 Bit Matrix Multiply (BMM) instructions - Immediately fail the build if a required #define is missing in one of KVM's headers that is included multiple times. - Reject SET_GUEST_DEBUG with -EBUSY if there's an already injected exception, mostly to prevent syzkaller from abusing the uAPI to trigger WARNs, but also because it can help prevent userspace from unintentionally crashing the VM. - Exempt SMM from CPUID faulting on Intel, as per the spec. - Misc hardening and cleanup changes. x86 (AMD): - Fix and optimize IRQ window inhibit handling for AVIC; make it per-vCPU so that KVM doesn't prematurely re-enable AVIC if multiple vCPUs have to-be-injected IRQs. - Clean up and optimize the OSVW handling, avoiding a bug in which KVM would overwrite state when enabling virtualization on multiple CPUs in parallel. This should not be a problem because OSVW should usually be the same for all CPUs. - Drop a WARN in KVM_MEMORY_ENCRYPT_REG_REGION where KVM complains about a "too large" size based purely on user input. - Clean up and harden the pinning code for KVM_MEMORY_ENCRYPT_REG_REGION. - Disallow synchronizing a VMSA of an already-launched/encrypted vCPU, as doing so for an SNP guest will crash the host due to an RMP violation page fault. - Overhaul KVM's APIs for detecting SEV+ guests so that VM-scoped queries are required to hold kvm->lock, and enforce it by lockdep. Fix various bugs where sev_guest() was not ensured to be stable for the whole duration of a function or ioctl. - Convert a pile of kvm->lock SEV code to guard(). - Play nicer with userspace that does not enable KVM_CAP_EXCEPTION_PAYLOAD, for which KVM needs to set CR2 and DR6 as a response to ioctls such as KVM_GET_VCPU_EVENTS (even if the payload would end up in EXITINFO2 rather than CR2, for example). Only set CR2 and DR6 when consumption of the payload is imminent, but on the other hand force delivery of the payload in all paths where userspace retrieves CR2 or DR6. - Use vcpu->arch.cr2 when updating vmcb12's CR2 on nested #VMEXIT instead of vmcb02->save.cr2. The value is out of sync after a save/restore or after a #PF is injected into L2. - Fix a class of nSVM bugs where some fields written by the CPU are not synchronized from vmcb02 to cached vmcb12 after VMRUN, and so are not up-to-date when saved by KVM_GET_NESTED_STATE. - Fix a class of bugs where the ordering between KVM_SET_NESTED_STATE and KVM_SET_{S}REGS could cause vmcb02 to be incorrectly initialized after save+restore. - Add a variety of missing nSVM consistency checks. - Fix several bugs where KVM failed to correctly update VMCB fields on nested #VMEXIT. - Fix several bugs where KVM failed to correctly synthesize #UD or #GP for SVM-related instructions. - Add support for save+restore of virtualized LBRs (on SVM). - Refactor various helpers and macros to improve clarity and (hopefully) make the code easier to maintain. - Aggressively sanitize fields when copying from vmcb12, to guard against unintentionally allowing L1 to utilize yet-to-be-defined features. - Fix several bugs where KVM botched rAX legality checks when emulating SVM instructions. There are remaining issues in that KVM doesn't handle size prefix overrides for 64-bit guests. - Fail emulation of VMRUN/VMLOAD/VMSAVE if mapping vmcb12 fails instead of somewhat arbitrarily synthesizing #GP (i.e. don't double down on AMD's architectural but sketchy behavior of generating #GP for "unsupported" addresses). - Cache all used vmcb12 fields to further harden against TOCTOU bugs. x86 (Intel): - Drop obsolete branch hint prefixes from the VMX instruction macros. - Use ASM_INPUT_RM() in __vmcs_writel() to coerce clang into using a register input when appropriate. - Code cleanups. guest_memfd: - Don't mark guest_memfd folios as accessed, as guest_memfd doesn't support reclaim, the memory is unevictable, and there is no storage to write back to. LoongArch selftests: - Add KVM PMU test cases s390 selftests: - Enable more memory selftests. x86 selftests: - Add support for Hygon CPUs in KVM selftests. - Fix a bug in the MSR test where it would get false failures on AMD/Hygon CPUs with exactly one of RDPID or RDTSCP. - Add an MADV_COLLAPSE testcase for guest_memfd as a regression test for a bug where the kernel would attempt to collapse guest_memfd folios against KVM's will. -----BEGIN PGP SIGNATURE----- iQFIBAABCAAyFiEE8TM4V0tmI4mGbHaCv/vSX3jHroMFAmnftRQUHHBib256aW5p QHJlZGhhdC5jb20ACgkQv/vSX3jHroPAzwf+NKO4Ktv+7A22ImN0SBl0nlUuulsz vTcw3+hxdRoIw83GdNS+hG5js0wrpMDnbv3t4+VliDNBSSxrBzcSWX2wpilW0Xtw qGo1MWhs2lKPy1NlaRVOwPS6j7uF3AR0TQ1iQLGMedQuCU9WpiKJxyhNXJdbLrt3 8EgFzsvtEsv+jKNRUNDf9+d0j4gZsFyIe+Brhianbw+u3/UCiUClLCdsKPc4+5ZX 08otYXytacGNIf/5Ev1vT4pHkHL0yqKXAtX7LEtaS3+0KrPuLjV4slemivzE9vf5 Evafm5AhA4wpaNMb1ZerhY3T94lsMaJpWxotjR//0Q7C9B59pCQnXCm8mg== =CcE0 -----END PGP SIGNATURE----- Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm Pull kvm updates from Paolo Bonzini: "Arm: - Add support for tracing in the standalone EL2 hypervisor code, which should help both debugging and performance analysis. This uses the new infrastructure for 'remote' trace buffers that can be exposed by non-kernel entities such as firmware, and which came through the tracing tree - Add support for GICv5 Per Processor Interrupts (PPIs), as the starting point for supporting the new GIC architecture in KVM - Finally add support for pKVM protected guests, where pages are unmapped from the host as they are faulted into the guest and can be shared back from the guest using pKVM hypercalls. Protected guests are created using a new machine type identifier. As the elusive guestmem has not yet delivered on its promises, anonymous memory is also supported This is only a first step towards full isolation from the host; for example, the CPU register state and DMA accesses are not yet isolated. Because this does not really yet bring fully what it promises, it is hidden behind CONFIG_ARM_PKVM_GUEST + 'kvm-arm.mode=protected', and also triggers TAINT_USER when a VM is created. Caveat emptor - Rework the dreaded user_mem_abort() function to make it more maintainable, reducing the amount of state being exposed to the various helpers and rendering a substantial amount of state immutable - Expand the Stage-2 page table dumper to support NV shadow page tables on a per-VM basis - Tidy up the pKVM PSCI proxy code to be slightly less hard to follow - Fix both SPE and TRBE in non-VHE configurations so that they do not generate spurious, out of context table walks that ultimately lead to very bad HW lockups - A small set of patches fixing the Stage-2 MMU freeing in error cases - Tighten-up accepted SMC immediate value to be only #0 for host SMCCC calls - The usual cleanups and other selftest churn LoongArch: - Use CSR_CRMD_PLV for kvm_arch_vcpu_in_kernel() - Add DMSINTC irqchip in kernel support RISC-V: - Fix steal time shared memory alignment checks - Fix vector context allocation leak - Fix array out-of-bounds in pmu_ctr_read() and pmu_fw_ctr_read_hi() - Fix double-free of sdata in kvm_pmu_clear_snapshot_area() - Fix integer overflow in kvm_pmu_validate_counter_mask() - Fix shift-out-of-bounds in make_xfence_request() - Fix lost write protection on huge pages during dirty logging - Split huge pages during fault handling for dirty logging - Skip CSR restore if VCPU is reloaded on the same core - Implement kvm_arch_has_default_irqchip() for KVM selftests - Factored-out ISA checks into separate sources - Added hideleg to struct kvm_vcpu_config - Factored-out VCPU config into separate sources - Support configuration of per-VM HGATP mode from KVM user space s390: - Support for ESA (31-bit) guests inside nested hypervisors - Remove restriction on memslot alignment, which is not needed anymore with the new gmap code - Fix LPSW/E to update the bear (which of course is the breaking event address register) x86: - Shut up various UBSAN warnings on reading module parameter before they were initialized - Don't zero-allocate page tables that are used for splitting hugepages in the TDP MMU, as KVM is guaranteed to set all SPTEs in the page table and thus write all bytes - As an optimization, bail early when trying to unsync 4KiB mappings if the target gfn can just be mapped with a 2MiB hugepage x86 generic: - Copy single-chunk MMIO write values into struct kvm_vcpu (more precisely struct kvm_mmio_fragment) to fix use-after-free stack bugs where KVM would dereference stack pointer after an exit to userspace - Clean up and comment the emulated MMIO code to try to make it easier to maintain (not necessarily "easy", but "easier") - Move VMXON+VMXOFF and EFER.SVME toggling out of KVM (not *all* of VMX and SVM enabling) as it is needed for trusted I/O - Advertise support for AVX512 Bit Matrix Multiply (BMM) instructions - Immediately fail the build if a required #define is missing in one of KVM's headers that is included multiple times - Reject SET_GUEST_DEBUG with -EBUSY if there's an already injected exception, mostly to prevent syzkaller from abusing the uAPI to trigger WARNs, but also because it can help prevent userspace from unintentionally crashing the VM - Exempt SMM from CPUID faulting on Intel, as per the spec - Misc hardening and cleanup changes x86 (AMD): - Fix and optimize IRQ window inhibit handling for AVIC; make it per-vCPU so that KVM doesn't prematurely re-enable AVIC if multiple vCPUs have to-be-injected IRQs - Clean up and optimize the OSVW handling, avoiding a bug in which KVM would overwrite state when enabling virtualization on multiple CPUs in parallel. This should not be a problem because OSVW should usually be the same for all CPUs - Drop a WARN in KVM_MEMORY_ENCRYPT_REG_REGION where KVM complains about a "too large" size based purely on user input - Clean up and harden the pinning code for KVM_MEMORY_ENCRYPT_REG_REGION - Disallow synchronizing a VMSA of an already-launched/encrypted vCPU, as doing so for an SNP guest will crash the host due to an RMP violation page fault - Overhaul KVM's APIs for detecting SEV+ guests so that VM-scoped queries are required to hold kvm->lock, and enforce it by lockdep. Fix various bugs where sev_guest() was not ensured to be stable for the whole duration of a function or ioctl - Convert a pile of kvm->lock SEV code to guard() - Play nicer with userspace that does not enable KVM_CAP_EXCEPTION_PAYLOAD, for which KVM needs to set CR2 and DR6 as a response to ioctls such as KVM_GET_VCPU_EVENTS (even if the payload would end up in EXITINFO2 rather than CR2, for example). Only set CR2 and DR6 when consumption of the payload is imminent, but on the other hand force delivery of the payload in all paths where userspace retrieves CR2 or DR6 - Use vcpu->arch.cr2 when updating vmcb12's CR2 on nested #VMEXIT instead of vmcb02->save.cr2. The value is out of sync after a save/restore or after a #PF is injected into L2 - Fix a class of nSVM bugs where some fields written by the CPU are not synchronized from vmcb02 to cached vmcb12 after VMRUN, and so are not up-to-date when saved by KVM_GET_NESTED_STATE - Fix a class of bugs where the ordering between KVM_SET_NESTED_STATE and KVM_SET_{S}REGS could cause vmcb02 to be incorrectly initialized after save+restore - Add a variety of missing nSVM consistency checks - Fix several bugs where KVM failed to correctly update VMCB fields on nested #VMEXIT - Fix several bugs where KVM failed to correctly synthesize #UD or #GP for SVM-related instructions - Add support for save+restore of virtualized LBRs (on SVM) - Refactor various helpers and macros to improve clarity and (hopefully) make the code easier to maintain - Aggressively sanitize fields when copying from vmcb12, to guard against unintentionally allowing L1 to utilize yet-to-be-defined features - Fix several bugs where KVM botched rAX legality checks when emulating SVM instructions. There are remaining issues in that KVM doesn't handle size prefix overrides for 64-bit guests - Fail emulation of VMRUN/VMLOAD/VMSAVE if mapping vmcb12 fails instead of somewhat arbitrarily synthesizing #GP (i.e. don't double down on AMD's architectural but sketchy behavior of generating #GP for "unsupported" addresses) - Cache all used vmcb12 fields to further harden against TOCTOU bugs x86 (Intel): - Drop obsolete branch hint prefixes from the VMX instruction macros - Use ASM_INPUT_RM() in __vmcs_writel() to coerce clang into using a register input when appropriate - Code cleanups guest_memfd: - Don't mark guest_memfd folios as accessed, as guest_memfd doesn't support reclaim, the memory is unevictable, and there is no storage to write back to LoongArch selftests: - Add KVM PMU test cases s390 selftests: - Enable more memory selftests x86 selftests: - Add support for Hygon CPUs in KVM selftests - Fix a bug in the MSR test where it would get false failures on AMD/Hygon CPUs with exactly one of RDPID or RDTSCP - Add an MADV_COLLAPSE testcase for guest_memfd as a regression test for a bug where the kernel would attempt to collapse guest_memfd folios against KVM's will" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (373 commits) KVM: x86: use inlines instead of macros for is_sev_*guest x86/virt: Treat SVM as unsupported when running as an SEV+ guest KVM: SEV: Goto an existing error label if charging misc_cg for an ASID fails KVM: SVM: Move lock-protected allocation of SEV ASID into a separate helper KVM: SEV: use mutex guard in snp_handle_guest_req() KVM: SEV: use mutex guard in sev_mem_enc_unregister_region() KVM: SEV: use mutex guard in sev_mem_enc_ioctl() KVM: SEV: use mutex guard in snp_launch_update() KVM: SEV: Assert that kvm->lock is held when querying SEV+ support KVM: SEV: Document that checking for SEV+ guests when reclaiming memory is "safe" KVM: SEV: Hide "struct kvm_sev_info" behind CONFIG_KVM_AMD_SEV=y KVM: SEV: WARN on unhandled VM type when initializing VM KVM: LoongArch: selftests: Add PMU overflow interrupt test KVM: LoongArch: selftests: Add basic PMU event counting test KVM: LoongArch: selftests: Add cpucfg read/write helpers LoongArch: KVM: Add DMSINTC inject msi to vCPU LoongArch: KVM: Add DMSINTC device support LoongArch: KVM: Make vcpu_is_preempted() as a macro rather than function LoongArch: KVM: Move host CSR_GSTAT save and restore in context switch LoongArch: KVM: Move host CSR_EENTRY save and restore in context switch ... |
||
|
Borislav Petkov (AMD)
|
e55d98e775 |
x86/CPU: Fix FPDSS on Zen1
Zen1's hardware divider can leave, under certain circumstances, partial results from previous operations. Those results can be leaked by another, attacker thread. Fix that with a chicken bit. Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
||
|
Linus Torvalds
|
440d6635b2 |
mm.git review status for linus..mm-nonmm-stable
Total patches: 126
Reviews/patch: 0.92
Reviewed rate: 76%
- The 2 patch series "pid: make sub-init creation retryable" from Oleg
Nesterov increases the robustness of our creation of init in a new
namespace. By clearing away some historical cruft which is no longer
needed. Also some documentation fixups are provided.
- The 2 patch series "selftests/fchmodat2: Error handling and general"
from Mark Brown has a fixup and a cleanup for the fchmodat2() syscall
selftest.
- The 3 patch series "lib: polynomial: Move to math/ and clean up" from
Andy Shevchenko does as advertised.
- The 3 patch series "hung_task: Provide runtime reset interface for
hung task detector" from Aaron Tomlin gives administrators the ability
to zero out /proc/sys/kernel/hung_task_detect_count.
- The 2 patch series "tools/getdelays: use the static UAPI headers from
tools/include/uapi" from Thomas Weißschuh teaches getdelays to use the
in-kernel UAPI headers rather than the system-provided ones.
- The 5 patch series "watchdog/hardlockup: Improvements to hardlockup"
from Mayank Rungta provides several cleanups and fixups to the
hardlockup detector code and its documentation.
- The 2 patch series "lib/bch: fix undefined behavior from signed
left-shifts" from Josh Law provides a couple of small/theoretical fixes
in the bch code.
- The 2 patch series "ocfs2/dlm: fix two bugs in dlm_match_regions()"
from Junrui Luo does what is claims.
- The 27 patch series "cleanup the RAID5 XOR library" from Christoph
Hellwig is a quite far-reaching cleanup to this code. I can't do better
than to quote Christoph:
The XOR library used for the RAID5 parity is a bit of a mess right
now. The main file sits in crypto/ despite not being cryptography and
not using the crypto API, with the generic implementations sitting in
include/asm-generic and the arch implementations sitting in an asm/
header in theory. The latter doesn't work for many cases, so
architectures often build the code directly into the core kernel, or
create another module for the architecture code.
Change this to a single module in lib/ that also contains the
architecture optimizations, similar to the library work Eric Biggers
has done for the CRC and crypto libraries later. After that it
changes to better calling conventions that allow for smarter
architecture implementations (although none is contained here yet),
and uses static_call to avoid indirection function call overhead.
- The 2 patch series "lib/list_sort: Clean up list_sort() scheduling
workarounds" from Kuan-Wei Chiu cleans up this library code by removing
a hacky thing which was added for UBIFS, which UBIFS doesn't actually
need.
- The 5 patch series "Fix bugs in extract_iter_to_sg()" from Christian
Ehrhardt fixes a few bugs in the scatterlist code, adds in-kernel tests
for the now-fixed bugs and fixes a leak in the test itself.
- The 3 patch series "kdump: Enable LUKS-encrypted dump target support
in ARM64 and PowerPC" from Coiby Xu eenables support of the
LUKS-encrypted device dump target on arm64 and powerpc.
- The 4 patch series "ocfs2: consolidate extent list validation into
block read callbacks" from Joseph Qi addresses ocfs2's validation of
extent list fields - cleanup, simplification, robustness. (Kernel test
robot loves mounting corrupted fs images!)
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Merge tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
- "pid: make sub-init creation retryable" (Oleg Nesterov)
Make creation of init in a new namespace more robust by clearing away
some historical cruft which is no longer needed. Also some
documentation fixups
- "selftests/fchmodat2: Error handling and general" (Mark Brown)
Fix and a cleanup for the fchmodat2() syscall selftest
- "lib: polynomial: Move to math/ and clean up" (Andy Shevchenko)
- "hung_task: Provide runtime reset interface for hung task detector"
(Aaron Tomlin)
Give administrators the ability to zero out
/proc/sys/kernel/hung_task_detect_count
- "tools/getdelays: use the static UAPI headers from
tools/include/uapi" (Thomas Weißschuh)
Teach getdelays to use the in-kernel UAPI headers rather than the
system-provided ones
- "watchdog/hardlockup: Improvements to hardlockup" (Mayank Rungta)
Several cleanups and fixups to the hardlockup detector code and its
documentation
- "lib/bch: fix undefined behavior from signed left-shifts" (Josh Law)
A couple of small/theoretical fixes in the bch code
- "ocfs2/dlm: fix two bugs in dlm_match_regions()" (Junrui Luo)
- "cleanup the RAID5 XOR library" (Christoph Hellwig)
A quite far-reaching cleanup to this code. I can't do better than to
quote Christoph:
"The XOR library used for the RAID5 parity is a bit of a mess right
now. The main file sits in crypto/ despite not being cryptography
and not using the crypto API, with the generic implementations
sitting in include/asm-generic and the arch implementations
sitting in an asm/ header in theory. The latter doesn't work for
many cases, so architectures often build the code directly into
the core kernel, or create another module for the architecture
code.
Change this to a single module in lib/ that also contains the
architecture optimizations, similar to the library work Eric
Biggers has done for the CRC and crypto libraries later. After
that it changes to better calling conventions that allow for
smarter architecture implementations (although none is contained
here yet), and uses static_call to avoid indirection function call
overhead"
- "lib/list_sort: Clean up list_sort() scheduling workarounds"
(Kuan-Wei Chiu)
Clean up this library code by removing a hacky thing which was added
for UBIFS, which UBIFS doesn't actually need
- "Fix bugs in extract_iter_to_sg()" (Christian Ehrhardt)
Fix a few bugs in the scatterlist code, add in-kernel tests for the
now-fixed bugs and fix a leak in the test itself
- "kdump: Enable LUKS-encrypted dump target support in ARM64 and
PowerPC" (Coiby Xu)
Enable support of the LUKS-encrypted device dump target on arm64 and
powerpc
- "ocfs2: consolidate extent list validation into block read callbacks"
(Joseph Qi)
Cleanup, simplify, and make more robust ocfs2's validation of extent
list fields (Kernel test robot loves mounting corrupted fs images!)
* tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (127 commits)
ocfs2: validate group add input before caching
ocfs2: validate bg_bits during freefrag scan
ocfs2: fix listxattr handling when the buffer is full
doc: watchdog: fix typos etc
update Sean's email address
ocfs2: use get_random_u32() where appropriate
ocfs2: split transactions in dio completion to avoid credit exhaustion
ocfs2: remove redundant l_next_free_rec check in __ocfs2_find_path()
ocfs2: validate extent block list fields during block read
ocfs2: remove empty extent list check in ocfs2_dx_dir_lookup_rec()
ocfs2: validate dx_root extent list fields during block read
ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY
ocfs2: handle invalid dinode in ocfs2_group_extend
.get_maintainer.ignore: add Askar
ocfs2: validate bg_list extent bounds in discontig groups
checkpatch: exclude forward declarations of const structs
tools/accounting: handle truncated taskstats netlink messages
taskstats: set version in TGID exit notifications
ocfs2/heartbeat: fix slot mapping rollback leaks on error paths
arm64,ppc64le/kdump: pass dm-crypt keys to kdump kernel
...
|