KVM: nVMX: Disable PML in hardware when running L2

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Unconditionally disable PML in vmcs02, KVM emulates PML purely in the
MMU, e.g. vmx_flush_pml_buffer() doesn't even try to copy the L2 GPAs
from vmcs02's buffer to vmcs12.  At best, enabling PML is a nop.  At
worst, it will cause vmx_flush_pml_buffer() to record bogus GFNs in the
dirty logs.

Initialize vmcs02.GUEST_PML_INDEX such that PML writes would trigger
VM-Exit if PML was somehow enabled, skip flushing the buffer for guest
mode since the index is bogus, and freak out if a PML full exit occurs
when L2 is active.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210213005015.1651772-7-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-02-12 16:50:07 -08:00 • committed by Paolo Bonzini

parent 9eba50f8d7

commit c3bb9a2083

2 changed files with 25 additions and 16 deletions

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29

arch/x86/kvm/vmx/nested.c

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12

arch/x86/kvm/vmx/vmx.c

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