KVM: x86: Add helpers to handle 64-bit APIC MSR read/writes

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Add helpers to handle 64-bit APIC read/writes via MSRs to deduplicate the
x2APIC and Hyper-V code needed to service reads/writes to ICR.  Future
support for IPI virtualization will add yet another path where KVM must
handle 64-bit APIC MSR reads/write (to ICR).

Opportunistically fix the comment in the write path; ICR2 holds the
destination (if there's no shorthand), not the vector.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220204214205.3306634-9-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2022-02-04 21:42:02 +00:00 • committed by Paolo Bonzini

parent 7018005235

commit 5429478d03

1 changed files with 29 additions and 30 deletions

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arch/x86/kvm/lapic.c

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