Re: [PATCH v3 00/10] KVM: VMX: Fix APICv activation bugs

[Sean Christopherson]

On Fri, 05 Dec 2025 15:19:03 -0800, Sean Christopherson wrote:
> Fix two bugs related to updating APICv state, add a regression test, and
> then rip out the "defer updates until nested VM-Exit" that contributed to
> bug #2, and eliminated a number ideas for fixing bug #1 (ignoring that my
> ideas weren't all that great).
> 
> The only thing that gives me pause is the TLB flushing logic in
> vmx_set_virtual_apic_mode(), mainly because I don't love open coding things
> like that.  But for me, it's a much lesser evil than the mounting pile of
> booleans related to tracking deferred updates, and the mental gymnastics
> needed to understanding the interactions and ordering.
> 
> [...]

Applied 1 and 2 to kvm-x86 fixes.

[01/10] KVM: VMX: Update SVI during runtime APICv activation
        https://github.com/kvm-x86/linux/commit/b2849bec936b
[02/10] KVM: nVMX: Immediately refresh APICv controls as needed on nested VM-Exit
        https://github.com/kvm-x86/linux/commit/297631388309

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https://github.com/kvm-x86/linux/tree/next