KVM: x86: Move delivery of non-APICv interrupt into vendor code

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Handle non-APICv interrupt delivery in vendor code, even though it means
VMX and SVM will temporarily have duplicate code.  SVM's AVIC has a race
condition that requires KVM to fall back to legacy interrupt injection
_after_ the interrupt has been logged in the vIRR, i.e. to fix the race,
SVM will need to open code the full flow anyways[*].  Refactor the code
so that the SVM bug without introducing other issues, e.g. SVM would
return "success" and thus invoke trace_kvm_apicv_accept_irq() even when
delivery through the AVIC failed, and to opportunistically prepare for
using KVM_X86_OP to fill each vendor's kvm_x86_ops struct, which will
rely on the vendor function matching the kvm_x86_op pointer name.

No functional change intended.

[*] https://lore.kernel.org/all/20211213104634.199141-4-mlevitsk@redhat.com

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220128005208.4008533-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Sean Christopherson 2022-01-28 00:51:48 +00:00 • committed by Paolo Bonzini

parent f6c6804c43

commit 57dfd7b53d

5 changed files with 37 additions and 12 deletions

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2

arch/x86/include/asm/kvm-x86-ops.h

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arch/x86/include/asm/kvm_host.h

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arch/x86/kvm/lapic.c

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arch/x86/kvm/svm/svm.c

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arch/x86/kvm/vmx/vmx.c

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