KVM: x86: Enhance comments for MMU roles and nested transition trickiness

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Expand the comments for the MMU roles.  The interactions with gfn_track
PGD reuse in particular are hairy.

Regarding PGD reuse, add comments in the nested virtualization flows to
call out why kvm_init_mmu() is unconditionally called even when nested
TDP is used.

Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622175739.3610207-50-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-06-22 10:57:34 -07:00 • committed by Paolo Bonzini

parent 3b77daa5ef

commit 616007c866

3 changed files with 49 additions and 10 deletions

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57

arch/x86/include/asm/kvm_host.h

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1

arch/x86/kvm/svm/nested.c

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1

arch/x86/kvm/vmx/nested.c

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