KVM: x86: Clean up and document nested #PF workaround

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Replace the per-vendor hack-a-fix for KVM's #PF => #PF => #DF workaround
with an explicit, common workaround in kvm_inject_emulated_page_fault().
Aside from being a hack, the current approach is brittle and incomplete,
e.g. nSVM's KVM_SET_NESTED_STATE fails to set ->inject_page_fault(),
and nVMX fails to apply the workaround when VMX is intercepting #PF due
to allow_smaller_maxphyaddr=1.

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

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Sean Christopherson 2022-03-03 20:20:17 -08:00 • committed by Paolo Bonzini

parent 25cc05652c

commit 6819af7597

4 changed files with 37 additions and 19 deletions

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2

arch/x86/include/asm/kvm_host.h

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18

arch/x86/kvm/svm/nested.c

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15

arch/x86/kvm/vmx/nested.c

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21

arch/x86/kvm/x86.c

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