Use the newfanged printf-based guest assert framework to spit out the
guest RIP when an unhandled exception is detected, which makes debugging
such failures *much* easier.
Link: https://lore.kernel.org/r/20230729003643.1053367-34-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Drop the param-based guest assert macros and enable the printf versions
for all selftests. Note! This change can affect tests even if they
don't use directly use guest asserts! E.g. via library code, or due to
the compiler making different optimization decisions.
Link: https://lore.kernel.org/r/20230729003643.1053367-33-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Convert x86's VMX PMU capabilities test to use printf-based guest asserts.
Opportunstically add a helper to do the WRMSR+assert so as to reduce the
amount of copy+paste needed to spit out debug information.
Link: https://lore.kernel.org/r/20230729003643.1053367-31-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Convert x86's nested SVM software interrupt injection test to use printf-
based guest asserts. Opportunistically use GUEST_ASSERT() and
GUEST_FAIL() in a few locations to spit out more debug information.
Link: https://lore.kernel.org/r/20230729003643.1053367-28-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Convert x86's nested exceptions test to printf-based guest asserts, and
use REPORT_GUEST_ASSERT() instead of TEST_FAIL() so that output is
formatted correctly.
Link: https://lore.kernel.org/r/20230729003643.1053367-26-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Convert x86's MONITOR/MWAIT test to use printf-based guest asserts. Add a
macro to handle reporting failures to reduce the amount of copy+paste
needed for MONITOR vs. MWAIT.
Link: https://lore.kernel.org/r/20230729003643.1053367-25-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Convert x86's Hyper-V feature test to use print-based guest asserts.
Opportunistically use the EQ and NE variants in a few places to capture
additional information.
Link: https://lore.kernel.org/r/20230729003643.1053367-23-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Convert x86's CPUID test to use printf-based GUEST_ASSERT_EQ() so that
the test prints out debug information. Note, the test previously used
REPORT_GUEST_ASSERT_2(), but that was pointless because none of the
guest-side code passed any parameters to the assert.
Link: https://lore.kernel.org/r/20230729003643.1053367-21-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Convert the steal_time test to use printf-based GUEST_ASERT.
Opportunistically use GUEST_ASSERT_EQ() and GUEST_ASSERT_NE() so that the
test spits out debug information on failure.
Link: https://lore.kernel.org/r/20230729003643.1053367-20-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Use printf-based guest assert reporting in ARM's vGIC IRQ test. Note,
this is not as innocuous as it looks! The printf-based version of
GUEST_ASSERT_EQ() ensures the expressions are evaluated only once, whereas
the old version did not!
Link: https://lore.kernel.org/r/20230729003643.1053367-15-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Convert ARM's debug exceptions test to use printf-based GUEST_ASSERT().
Opportunistically Use GUEST_ASSERT_EQ() in guest_code_ss() so that the
expected vs. actual values get printed out.
Link: https://lore.kernel.org/r/20230729003643.1053367-12-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Convert ARM's aarch_timer test to use printf-based GUEST_ASSERT().
To maintain existing functionality, manually print the host information,
e.g. stage and iteration, to stderr prior to reporting the guest assert.
Link: https://lore.kernel.org/r/20230729003643.1053367-11-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Add a test to exercise the various features in KVM selftest's local
snprintf() and compare them to LIBC's snprintf() to ensure they behave
the same.
This is not an exhaustive test. KVM's local snprintf() does not
implement all the features LIBC does, e.g. KVM's local snprintf() does
not support floats or doubles, so testing for those features were
excluded.
Testing was added for the features that are expected to work to
support a minimal version of printf() in the guest.
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
[sean: use UCALL_EXIT_REASON, enable for all architectures]
Link: https://lore.kernel.org/r/20230731203026.1192091-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Define the expected architecture specific exit reason for a successful
ucall so that common tests can assert that a ucall occurred without the
test needing to implement arch specific code.
Suggested-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20230731203026.1192091-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Add an architecture specific ucall.h and inline the simple arch hooks,
e.g. the init hook for everything except ARM, and the actual "do ucall"
hook for everything except x86 (which should be simple, but temporarily
isn't due to carrying a workaround).
Having a per-arch ucall header will allow adding a #define for the
expected KVM exit reason for a ucall that is colocated (for everything
except x86) with the ucall itself.
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20230731203026.1192091-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Add printf-based GUEST_ASSERT macros and accompanying host-side support to
provide an assert-specific versions of GUEST_PRINTF(). To make it easier
to parse assert messages, for humans and bots alike, preserve/use the same
layout as host asserts, e.g. in the example below, the reported expression,
file, line number, and message are from the guest assertion, not the host
reporting of the assertion.
The call stack still captures the host reporting, but capturing the guest
stack is a less pressing concern, i.e. can be done in the future, and an
optimal solution would capture *both* the host and guest stacks, i.e.
capturing the host stack isn't an outright bug.
Running soft int test
==== Test Assertion Failure ====
x86_64/svm_nested_soft_inject_test.c:39: regs->rip != (unsigned long)l2_guest_code_int
pid=214104 tid=214104 errno=4 - Interrupted system call
1 0x0000000000401b35: run_test at svm_nested_soft_inject_test.c:191
2 0x00000000004017d2: main at svm_nested_soft_inject_test.c:212
3 0x0000000000415b03: __libc_start_call_main at libc-start.o:?
4 0x000000000041714f: __libc_start_main_impl at ??:?
5 0x0000000000401660: _start at ??:?
Expected IRQ at RIP 0x401e50, received IRQ at 0x401e50
Don't bother sharing code between ucall_assert() and ucall_fmt(), as
forwarding the variable arguments would either require using macros or
building a va_list, i.e. would make the code less readable and/or require
just as much copy+paste code anyways.
Gate the new macros with a flag so that tests can more or less be switched
over one-by-one. The slow conversion won't be perfect, e.g. library code
won't pick up the flag, but the only asserts in library code are of the
vanilla GUEST_ASSERT() variety, i.e. don't print out variables.
Add a temporary alias to GUEST_ASSERT_1() to fudge around ARM's
arch_timer.h header using GUEST_ASSERT_1(), thus thwarting any attempt to
convert tests one-by-one.
Link: https://lore.kernel.org/r/20230729003643.1053367-9-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Add more flexibility to guest debugging and testing by adding
GUEST_PRINTF() and GUEST_ASSERT_FMT() to the ucall framework.
Add a sized buffer to the ucall structure to hold the formatted string,
i.e. to allow the guest to easily resolve the string, and thus avoid the
ugly pattern of the host side having to make assumptions about the desired
format, as well as having to pass around a large number of parameters.
The buffer size was chosen to accommodate most use cases, and based on
similar usage. E.g. printf() uses the same size buffer in
arch/x86/boot/printf.c. And 1KiB ought to be enough for anybody.
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
[sean: massage changelog, wrap macro param in ()]
Link: https://lore.kernel.org/r/20230729003643.1053367-8-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Add additional pages to the guest to account for the number of pages
the ucall headers need. The only reason things worked before is the
ucall headers are fairly small. If they were ever to increase in
size the guest could run out of memory.
This is done in preparation for adding string formatting options to
the guest through the ucall framework which increases the size of
the ucall headers.
Fixes: 426729b2cf ("KVM: selftests: Add ucall pool based implementation")
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Link: https://lore.kernel.org/r/20230729003643.1053367-7-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Add a local version of guest_snprintf() for use in the guest.
Having a local copy allows the guest access to string formatting
options without dependencies on LIBC. LIBC is problematic because
it heavily relies on both AVX-512 instructions and a TLS, neither of
which are guaranteed to be set up in the guest.
The file guest_sprintf.c was lifted from arch/x86/boot/printf.c and
adapted to work in the guest, including the addition of buffer length.
I.e. s/sprintf/snprintf/
The functions where prefixed with "guest_" to allow guests to
explicitly call them.
A string formatted by this function is expected to succeed or die. If
something goes wrong during the formatting process a GUEST_ASSERT()
will be thrown.
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Link: https://lore.kernel.org/all/mtdi6smhur5rqffvpu7qux7mptonw223y2653x2nwzvgm72nlo@zyc4w3kwl3rg
[sean: add a link to the discussion of other options]
Link: https://lore.kernel.org/r/20230729003643.1053367-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Add strnlen() to the string overrides to allow it to be called in the
guest.
The implementation for strnlen() was taken from the kernel's generic
version, lib/string.c.
This will be needed when printf() is introduced.
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Link: https://lore.kernel.org/r/20230729003643.1053367-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Preserve or clobber all GPRs (except RIP and RSP, as they're saved and
restored via the VMCS) when performing a ucall on x86 to fudge around a
horrific long-standing bug in selftests' nested VMX support where L2's
GPRs are not preserved across a nested VM-Exit. I.e. if a test triggers a
nested VM-Exit to L1 in response to a ucall, e.g. GUEST_SYNC(), then L2's
GPR state can be corrupted.
The issues manifests as an unexpected #GP in clear_bit() when running the
hyperv_evmcs test due to RBX being used to track the ucall object, and RBX
being clobbered by the nested VM-Exit. The problematic hyperv_evmcs
testcase is where L0 (test's host userspace) injects an NMI in response to
GUEST_SYNC(8) from L2, but the bug could "randomly" manifest in any test
that induces a nested VM-Exit from L0. The bug hasn't caused failures in
the past due to sheer dumb luck.
The obvious fix is to rework the nVMX helpers to save/restore L2 GPRs
across VM-Exit and VM-Enter, but that is a much bigger task and carries
its own risks, e.g. nSVM does save/restore GPRs, but not in a thread-safe
manner, and there is a _lot_ of cleanup that can be done to unify code
for doing VM-Enter on nVMX, nSVM, and eVMCS.
Link: https://lore.kernel.org/r/20230729003643.1053367-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Clean up TEST_ASSERT_EQ() so that the (mostly) raw code is captured in the
main assert message, not the helper macro's code. E.g. make this:
x86_64/tsc_msrs_test.c:106: __a == __b
pid=40470 tid=40470 errno=0 - Success
1 0x000000000040170e: main at tsc_msrs_test.c:106
2 0x0000000000416f23: __libc_start_call_main at libc-start.o:?
3 0x000000000041856f: __libc_start_main_impl at ??:?
4 0x0000000000401ef0: _start at ??:?
TEST_ASSERT_EQ(rounded_host_rdmsr(MSR_IA32_TSC), val + 1) failed.
rounded_host_rdmsr(MSR_IA32_TSC) is 0
val + 1 is 0x1
look like this:
x86_64/tsc_msrs_test.c:106: rounded_host_rdmsr(MSR_IA32_TSC) == val + 1
pid=5737 tid=5737 errno=0 - Success
1 0x0000000000401714: main at tsc_msrs_test.c:106
2 0x0000000000415c23: __libc_start_call_main at libc-start.o:?
3 0x000000000041726f: __libc_start_main_impl at ??:?
4 0x0000000000401e60: _start at ??:?
0 != 0x1 (rounded_host_rdmsr(MSR_IA32_TSC) != val + 1)
Opportunstically clean up the formatting of the entire macro.
Link: https://lore.kernel.org/r/20230729003643.1053367-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
There is already an ASSERT_EQ macro in the file
tools/testing/selftests/kselftest_harness.h, so currently KVM selftests
can't include test_util.h from the KVM selftests together with that file.
Rename the macro in the KVM selftests to TEST_ASSERT_EQ to avoid the
problem - it is also more similar to the other macros in test_util.h that
way.
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/r/20230712075910.22480-2-thuth@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Don't nullify "nodep" to NULL one line before it's set to "tmp".
Signed-off-by: Minjie Du <duminjie@vivo.com>
Link: https://lore.kernel.org/r/20230704122148.11573-1-duminjie@vivo.com
[sean: massage shortlog+changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
With test case kvm_page_table_test, start time is acquired with
time type CLOCK_MONOTONIC_RAW, however end time in timespec_elapsed()
is acquired with time type CLOCK_MONOTONIC. This can cause inaccurate
elapsed time calculation due to mixing timebases, e.g. LoongArch in
particular will see weirdness.
Modify kvm_page_table_test to use unified time type CLOCK_MONOTONIC for
start time.
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20230731022405.854884-1-maobibo@loongson.cn
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Attempt to set the to-be-queued exception to be both pending and injected
_after_ KVM_CAP_SYNC_REGS's kvm_vcpu_ioctl_x86_set_vcpu_events() squashes
the pending exception (if there's also an injected exception). Buggy KVM
versions will eventually yell loudly about having impossible state when
processing queued excpetions, e.g.
WARNING: CPU: 0 PID: 1115 at arch/x86/kvm/x86.c:10095 kvm_check_and_inject_events+0x220/0x500 [kvm]
arch/x86/kvm/x86.c:kvm_check_and_inject_events():
WARN_ON_ONCE(vcpu->arch.exception.injected &&
vcpu->arch.exception.pending);
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Link: https://lore.kernel.org/r/20230728001606.2275586-3-mhal@rbox.co
[sean: split to separate patch, massage changelog and comment]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Attempt to modify the to-be-injected exception vector to an illegal value
_after_ the sanity checks performed by KVM_CAP_SYNC_REGS's
arch/x86/kvm/x86.c:kvm_vcpu_ioctl_x86_set_vcpu_events(). Buggy KVM
versions will eventually yells loudly about attempting to inject a bogus
vector, e.g.
WARNING: CPU: 0 PID: 1107 at arch/x86/kvm/x86.c:547 kvm_check_and_inject_events+0x4a0/0x500 [kvm]
arch/x86/kvm/x86.c:exception_type():
WARN_ON(vector > 31 || vector == NMI_VECTOR)
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Link: https://lore.kernel.org/r/20230728001606.2275586-3-mhal@rbox.co
[sean: split to separate patch]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Attempt to modify vcpu->run->s.regs _after_ the sanity checks performed by
KVM_CAP_SYNC_REGS's arch/x86/kvm/x86.c:sync_regs(). This can lead to some
nonsensical vCPU states accompanied by kernel splats, e.g. disabling PAE
while long mode is enabled makes KVM all kinds of confused:
WARNING: CPU: 0 PID: 1142 at arch/x86/kvm/mmu/paging_tmpl.h:358 paging32_walk_addr_generic+0x431/0x8f0 [kvm]
arch/x86/kvm/mmu/paging_tmpl.h:
KVM_BUG_ON(is_long_mode(vcpu) && !is_pae(vcpu), vcpu->kvm)
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Link: https://lore.kernel.org/r/20230728001606.2275586-3-mhal@rbox.co
[sean: see link]
Signed-off-by: Sean Christopherson <seanjc@google.com>
In a spirit of using a sledgehammer to crack a nut, make sync_regs() feed
__set_sregs() and kvm_vcpu_ioctl_x86_set_vcpu_events() with kernel's own
copy of data.
Both __set_sregs() and kvm_vcpu_ioctl_x86_set_vcpu_events() assume they
have exclusive rights to structs they operate on. While this is true when
coming from an ioctl handler (caller makes a local copy of user's data),
sync_regs() breaks this contract; a pointer to a user-modifiable memory
(vcpu->run->s.regs) is provided. This can lead to a situation when incoming
data is checked and/or sanitized only to be re-set by a user thread running
in parallel.
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Fixes: 01643c51bf ("KVM: x86: KVM_CAP_SYNC_REGS")
Link: https://lore.kernel.org/r/20230728001606.2275586-2-mhal@rbox.co
Signed-off-by: Sean Christopherson <seanjc@google.com>
group exists yet but the code still goes and iterates over event
siblings
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Merge tag 'perf_urgent_for_v6.5_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fix from Borislav Petkov:
- Fix a lockdep warning when the event given is the first one, no event
group exists yet but the code still goes and iterates over event
siblings
* tag 'perf_urgent_for_v6.5_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86: Fix lockdep warning in for_each_sibling_event() on SPR
doing an inter-procedural optimization and confuse objtool
- Initialize struct elf fully to avoid build failures
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Merge tag 'objtool_urgent_for_v6.5_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull objtool fixes from Borislav Petkov:
- Mark copy_iovec_from_user() __noclone in order to prevent gcc from
doing an inter-procedural optimization and confuse objtool
- Initialize struct elf fully to avoid build failures
* tag 'objtool_urgent_for_v6.5_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
iov_iter: Mark copy_iovec_from_user() noclone
objtool: initialize all of struct elf
- Fix the idle sibling selection
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Merge tag 'sched_urgent_for_v6.5_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fixes from Borislav Petkov:
- Remove a cgroup from under a polling process properly
- Fix the idle sibling selection
* tag 'sched_urgent_for_v6.5_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/psi: use kernfs polling functions for PSI trigger polling
sched/fair: Use recent_used_cpu to test p->cpus_ptr
- Fix a really annoying interrupt storm in the AMD driver
affecting Asus TUF gaming notebooks.
- Fix device tree parsing in the Renesas driver.
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Merge tag 'pinctrl-v6.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
Pull pin control fixes from Linus Walleij:
"I'm mostly on vacation but what would vacation be without a few
critical fixes so people can use their gaming laptops when hiding away
from the sun (or rain)?
- Fix a really annoying interrupt storm in the AMD driver affecting
Asus TUF gaming notebooks
- Fix device tree parsing in the Renesas driver"
* tag 'pinctrl-v6.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
pinctrl: amd: Unify debounce handling into amd_pinconf_set()
pinctrl: amd: Drop pull up select configuration
pinctrl: amd: Use amd_pinconf_set() for all config options
pinctrl: amd: Only use special debounce behavior for GPIO 0
pinctrl: renesas: rzg2l: Handle non-unique subnode names
pinctrl: renesas: rzv2m: Handle non-unique subnode names
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Merge tag '6.5-rc1-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull smb client fixes from Steve French:
- Two reconnect fixes: important fix to address inFlight count to leak
(which can leak credits), and fix for better handling a deleted share
- DFS fix
- SMB1 cleanup fix
- deferred close fix
* tag '6.5-rc1-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
cifs: fix mid leak during reconnection after timeout threshold
cifs: is_network_name_deleted should return a bool
smb: client: fix missed ses refcounting
smb: client: Fix -Wstringop-overflow issues
cifs: if deferred close is disabled then close files immediately
- Fix Speculation_Store_Bypass reporting in /proc/self/status on Power10.
- Fix HPT with 4K pages since recent changes by implementing pmd_same().
- Fix 64-bit native_hpte_remove() to be irq-safe.
Thanks to: Aneesh Kumar K.V, Nageswara R Sastry, Russell Currey.
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Merge tag 'powerpc-6.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman:
- Fix Speculation_Store_Bypass reporting in /proc/self/status on
Power10
- Fix HPT with 4K pages since recent changes by implementing pmd_same()
- Fix 64-bit native_hpte_remove() to be irq-safe
Thanks to Aneesh Kumar K.V, Nageswara R Sastry, and Russell Currey.
* tag 'powerpc-6.5-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/mm/book3s64/hash/4k: Add pmd_same callback for 4K page size
powerpc/64e: Fix obtool warnings in exceptions-64e.S
powerpc/security: Fix Speculation_Store_Bypass reporting on Power10
powerpc/64s: Fix native_hpte_remove() to be irq-safe
