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KVM: nVMX: Precisely mark vAPIC and PID maps dirty when delivering nested PI

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Explicitly mark the vmcs12 vAPIC and PI descriptor pages as dirty when
delivering a nested posted interrupt instead of marking all vmcs12 pages
as dirty.  This will allow marking the APIC access page (and any future
 vmcs12 pages) as dirty in nested_mark_vmcs12_pages_dirty() without over-
dirtying in the nested PI case.  Manually marking the vAPIC and PID pages
as dirty also makes the flow a bit more self-documenting, e.g. it's not
obvious at first glance that vmx->nested.pi_desc is actually a host kernel
mapping of a vmcs12 page.

No functional change intended.

Link: https://patch.msgid.link/20251121223444.355422-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2025-11-21 14:34:42 -08:00
parent 70b02809de
commit f74bb1d2ed
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/vmx/nested.c
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@ -4028,7 +4028,8 @@ static int vmx_complete_nested_posted_interrupt(struct kvm_vcpu *vcpu)
}
}
nested_mark_vmcs12_pages_dirty(vcpu);
kvm_vcpu_map_mark_dirty(vcpu, &vmx->nested.virtual_apic_map);
kvm_vcpu_map_mark_dirty(vcpu, &vmx->nested.pi_desc_map);
return 0;
mmio_needed: