Re: [PATCH] KVM: SVM: Do not virtualize MSR accesses for APIC LVTT register

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On 7/25/22 4:46 PM, Paolo Bonzini wrote:
On 7/25/22 05:34, Suravee Suthikulpanit wrote:
AMD does not support APIC TSC-deadline timer mode. AVIC hardware
will generate GP fault when guest kernel writes 1 to bits [18]
of the APIC LVTT register (offset 0x32) to set the timer mode.
(Note: bit 18 is reserved on AMD system).

Therefore, always intercept and let KVM emulate the MSR accesses.

Fixes: f3d7c8aa6882 ("KVM: SVM: Fix x2APIC MSRs interception")
Signed-off-by: Suravee Suthikulpanit<suravee.suthikulpanit@xxxxxxx>

Does this fix some kvm-unit-tests testcase?

I am not sure if we have kvm-unit-tests testcases for this.
I found this when enabling tsc-deadline option in QEMU causing
the vm to fail to boot.

Anyway, I queued the patch, thanks!

Paolo

Thank you,
Suravee



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