KVM: nVMX: Use kvm_vcpu_map() to get/pin vmcs12's APIC-access page

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Use kvm_vcpu_map() to get/pin the backing for vmcs12's APIC-access page,
there's no reason it has to be restricted to 'struct page' backing.  The
APIC-access page actually doesn't need to be backed by anything, which is
ironically why it got left behind by the series which introduced
kvm_vcpu_map()[1]; the plan was to shove a dummy pfn into vmcs02[2], but
that code never got merged.

Switching the APIC-access page to kvm_vcpu_map() doesn't preclude using a
magic pfn in the future, and will allow a future patch to drop
kvm_vcpu_gpa_to_page().

[1] https://lore.kernel.org/all/1547026933-31226-1-git-send-email-karahmed@amazon.de
[2] https://lore.kernel.org/lkml/1543845551-4403-1-git-send-email-karahmed@amazon.de

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220429010416.2788472-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

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Sean Christopherson 2022-04-29 01:04:11 +00:00 • committed by Paolo Bonzini

parent 8e1c69149f

commit fe1911aa44

2 changed files with 13 additions and 28 deletions

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39

arch/x86/kvm/vmx/nested.c

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2

arch/x86/kvm/vmx/vmx.h

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