Re: [PATCH v3 2/3] KVM: SVM: Disable x2AVIC RDMSR interception for MSRs KVM actually supports

[Naveen N Rao]

On Thu, May 14, 2026 at 02:31:14PM -0700, Sean Christopherson wrote:
> When toggling x2AVIC on/off, use KVM's curated mask of x2APIC MSRs that
> can/should be passed through to the guest (or not) when 2AVIC is enabled.
> Using the effective list provided by the local APIC emulation fixes
> multiple (classes of) bugs, as the existing hand-coded list of MSRs is
> wrong on multiple fronts:
> 
>  - ARBPRI isn't supported by x2APIC, but its unaccelerated AVIC intercept
>    is fault-like; disabling interception is nonsensical and suboptimal as
>    the access generates a #VMEXIT that requires decoding the instruction.

Nit: unless you decided against incorporating the changes we discussed 
in v2, please update this part while applying.


- Naveen