[Bug 219085] kvm_spurious_fault in L1 when running a nested kvm instance on AMD Opteron_G5_qemu L0

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219085

--- Comment #2 from Sean Christopherson (seanjc@google.com) ---
On Mon, Jul 22, 2024, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=219085
> 
> --- Comment #1 from ununpta@mailto.plus ---
> Command I used on L0 AMD Ryzen:
> qemu-system-x86_64.exe -m 4096 -machine q35 -accel whpx -smp 1 -cpu

This is likely an issue in the L0 hypervisor, which in this case is Hyper-V. 
KVM
(L1) hits a #GP when trying to enable EFER.SVME, which leads to the #UD on
VMSAVE
(SVM isn't enabled).

  [  355.714362] unchecked MSR access error: WRMSR to 0xc0000080 (tried to
write 0x0000000000001d01) at rIP: 0xffffffff9228a274
(native_write_msr+0x4/0x20)

Do you you see the same behavior on other kernel (L1) version?  Have you
changed
any other components (especially in L0)?

> Opteron_G5,check,+svm -hda c:\debian.qcow2
> 
> It's reproducible in 100% cases
> 
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