Re: [PATCH v4 0/8] KVM: VMX: Rip out "deferred nested VM-Exit updates"

[Sean Christopherson <seanjc@google.com>]

On Thu, 08 Jan 2026 19:45:24 -0800, Sean Christopherson wrote:
> v4 of what was "KVM: VMX: Fix APICv activation bugs", but the two bug fixes
> were already merged and so that name doesn't fit.
> 
> Rip out the "defer updates until nested VM-Exit" that contributed to the
> APICv bugs and made them harder to fix.
> 
> v4:
>  - Collect reviews. [Chao]
>  - Use the existing vmcall() in the selftest. [Chao]
>  - Use GUEST_FAIL() instead of TEST_FAIL() in the guest. [Chao]
>  - Correct the number of args passed to the guest in the test. [Chao]
>  - Remove the redundant hwapic_isr_update() call in kvm_lapic_reset()
>  - Use the local "vmx" variable in vmx_set_virtual_apic_mode(). [Chao]
>  - Relocate the "update SVI" comment from __kvm_vcpu_update_apicv()
>    to kvm_apic_update_apicv().
> 
> [...]

Applied to kvm-x86 apic, thanks!

[1/8] KVM: selftests: Add a test to verify APICv updates (while L2 is active)
      https://github.com/kvm-x86/linux/commit/c3a9a27c79e4
[2/8] KVM: nVMX: Switch to vmcs01 to update PML controls on-demand if L2 is active
      https://github.com/kvm-x86/linux/commit/3e013d0a7099
[3/8] KVM: nVMX: Switch to vmcs01 to update TPR threshold on-demand if L2 is active
      https://github.com/kvm-x86/linux/commit/51ca2746078e
[4/8] KVM: nVMX: Switch to vmcs01 to update SVI on-demand if L2 is active
      https://github.com/kvm-x86/linux/commit/f0044429b257
[5/8] KVM: nVMX: Switch to vmcs01 to refresh APICv controls on-demand if L2 is active
      https://github.com/kvm-x86/linux/commit/2bf889a68fba
[6/8] KVM: nVMX: Switch to vmcs01 to update APIC page on-demand if L2 is active
      https://github.com/kvm-x86/linux/commit/51c821d6d0ba
[7/8] KVM: nVMX: Switch to vmcs01 to set virtual APICv mode on-demand if L2 is active
      https://github.com/kvm-x86/linux/commit/249cc1ab4b9a
[8/8] KVM: x86: Update APICv ISR (a.k.a. SVI) as part of kvm_apic_update_apicv()
      https://github.com/kvm-x86/linux/commit/000d75b0b186

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