On 19/5/2022 8:14 pm, Vitaly Kuznetsov wrote:
Like Xu <like.xu.linux@xxxxxxxxx> writes:
...
Hi, the following commit
KVM: x86/pmu: Add IA32_PEBS_ENABLE MSR emulation for extended PEBS
(currently in kvm/queue) breaks a number of selftests, e.g.:
Indeed, e.g.:
x86_64/hyperv_clock
x86_64/max_vcpuid_cap_test
x86_64/mmu_role_test
# ./tools/testing/selftests/kvm/x86_64/state_test
This test continues to be silent after the top commit a3808d884612 ("KVM: x86/pmu:
Expose CPUIDs feature bits PDCM, DS, DTES64"), which implies a root cause.
Anyway, thanks for this git-bisect report.
==== Test Assertion Failure ====
lib/x86_64/processor.c:1207: r == nmsrs
pid=6702 tid=6702 errno=7 - Argument list too long
1 0x000000000040da11: vcpu_save_state at processor.c:1207 (discriminator 4)
2 0x00000000004024e5: main at state_test.c:209 (discriminator 6)
3 0x00007f9f48c2d55f: ?? ??:0
4 0x00007f9f48c2d60b: ?? ??:0
5 0x00000000004026d4: _start at ??:?
Unexpected result from KVM_GET_MSRS, r: 29 (failed MSR was 0x3f1)
I don't think any of these failing tests care about MSR_IA32_PEBS_ENABLE
in particular, they're just trying to do KVM_GET_MSRS/KVM_SET_MSRS.
