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linux/arch/x86/kvm
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Borislav Petkov (AMD) 1251b96d79 x86/CPU/AMD: Fix the DIV(0) initial fix attempt 
commit f58d6fbcb7 upstream.

Initially, it was thought that doing an innocuous division in the #DE
handler would take care to prevent any leaking of old data from the
divider but by the time the fault is raised, the speculation has already
advanced too far and such data could already have been used by younger
operations.

Therefore, do the innocuous division on every exit to userspace so that
userspace doesn't see any potentially old data from integer divisions in
kernel space.

Do the same before VMRUN too, to protect host data from leaking into the
guest too.

Fixes: 77245f1c3c ("x86/CPU/AMD: Do not leak quotient data after a division by 0")
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/20230811213824.10025-1-bp@alien8.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-08-23 17:32:41 +02:00
..
mmu KVM: x86/mmu: Grab memslot for correct address space in NX recovery worker 2023-06-02 16:34:10 -07:00
svm x86/CPU/AMD: Fix the DIV(0) initial fix attempt 2023-08-23 17:32:41 +02:00
vmx KVM: x86: Disallow KVM_SET_SREGS{2} if incoming CR0 is invalid 2023-08-03 10:26:01 +02:00
.gitignore KVM: x86: use a separate asm-offsets.c file 2022-11-09 12:10:17 -05:00
cpuid.c x86/srso: Add SRSO_NO support 2023-08-08 20:04:52 +02:00
cpuid.h KVM: x86: Add dedicated helper to get CPUID entry with significant index 2022-07-14 11:38:32 -04:00
debugfs.c KVM: x86: Unify pr_fmt to use module name for all KVM modules 2022-12-29 15:47:35 -05:00
emulate.c KVM: x86: Assert that the emulator doesn't load CS with garbage in !RM 2023-03-23 16:07:52 -07:00
fpu.h KVM: x86: Move FPU register accessors into fpu.h 2021-06-17 13:09:24 -04:00
hyperv.c KVM x86 PMU changes for 6.3: 2023-02-15 08:23:24 -05:00
hyperv.h KVM: x86: Hyper-V invariant TSC control 2022-12-29 15:33:29 -05:00
i8254.c KVM: x86: Unify pr_fmt to use module name for all KVM modules 2022-12-29 15:47:35 -05:00
i8254.h KVM: x86: PIT: Preserve state of speaker port data bit 2022-06-08 13:06:20 -04:00
i8259.c KVM: x86: Unify pr_fmt to use module name for all KVM modules 2022-12-29 15:47:35 -05:00
ioapic.c KVM: x86/ioapic: Resample the pending state of an IRQ when unmasking 2023-03-27 10:13:28 -04:00
ioapic.h x86/kvm: remove unused ack_notifier callbacks 2021-11-18 07:05:57 -05:00
irq.c KVM: x86: Unify pr_fmt to use module name for all KVM modules 2022-12-29 15:47:35 -05:00
irq.h x86/kvm: remove unused ack_notifier callbacks 2021-11-18 07:05:57 -05:00
irq_comm.c KVM: x86: Unify pr_fmt to use module name for all KVM modules 2022-12-29 15:47:35 -05:00
Kconfig kvm: Remove "select SRCU" 2023-04-05 13:47:42 +00:00
kvm-asm-offsets.c KVM: SVM: move MSR_IA32_SPEC_CTRL save/restore to assembly 2022-11-09 12:25:53 -05:00
kvm_cache_regs.h KVM: x86: Add helpers to query individual CR0/CR4 bits 2023-03-22 10:10:53 -07:00
kvm_emulate.h KVM: x86: Use emulator callbacks instead of duplicating "host flags" 2023-01-31 17:29:09 -08:00
kvm_onhyperv.c KVM: x86/mmu: Move filling of Hyper-V's TLB range struct into Hyper-V code 2023-04-10 15:17:29 -07:00
kvm_onhyperv.h s390: 2023-05-01 12:06:20 -07:00
lapic.c KVM: x86: Bail from kvm_recalculate_phys_map() if x2APIC ID is out-of-bounds 2023-06-02 17:20:50 -07:00
lapic.h KVM: x86: Split out logic to generate "readable" APIC regs mask to helper 2023-01-24 10:04:35 -08:00
Makefile KVM: x86: Introduce .hv_inject_synthetic_vmexit_post_tlb_flush() nested hook 2022-11-18 12:59:13 -05:00
mmu.h KVM: x86/mmu: Refresh CR0.WP prior to checking for emulated permission faults 2023-04-10 15:25:36 -07:00
mtrr.c KVM: x86: Unify pr_fmt to use module name for all KVM modules 2022-12-29 15:47:35 -05:00
pmu.c KVM x86 PMU changes for 6.4: 2023-04-26 15:53:36 -04:00
pmu.h KVM: x86/pmu: Fix a typo in kvm_pmu_request_counter_reprogam() 2023-04-07 09:07:41 -07:00
reverse_cpuid.h ARM: 2023-02-25 11:30:21 -08:00
smm.c KVM: x86: Use emulator callbacks instead of duplicating "host flags" 2023-01-31 17:29:09 -08:00
smm.h KVM: x86: smm: preserve interrupt shadow in SMRAM 2022-11-09 12:31:26 -05:00
trace.h KVM: x86/xen: Add CPL to Xen hypercall tracepoint 2022-11-28 13:31:01 -05:00
tss.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
x86.c x86: Move gds_ucode_mitigated() declaration to header 2023-08-16 18:32:22 +02:00
x86.h KVM selftests, and an AMX/XCR0 bugfix, for 6.4: 2023-04-26 15:56:01 -04:00
xen.c KVM: x86/xen: update Xen CPUID Leaf 4 (tsc info) sub-leaves, if present 2023-01-24 10:05:20 -08:00
xen.h KVM: x86/xen: update Xen CPUID Leaf 4 (tsc info) sub-leaves, if present 2023-01-24 10:05:20 -08:00