KVM: x86/mmu: Use '0' as the one and only value for an invalid PAE root

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Use '0' to denote an invalid pae_root instead of '0' or INVALID_PAGE.
Unlike root_hpa, the pae_roots hold permission bits and thus are
guaranteed to be non-zero.  Having to deal with both values leads to
bugs, e.g. failing to set back to INVALID_PAGE, warning on the wrong
value, etc...

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210309224207.1218275-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

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Sean Christopherson 2021-03-09 14:42:06 -08:00 • committed by Paolo Bonzini

parent 978c834a66

commit c834e5e44f

3 changed files with 24 additions and 12 deletions

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24

arch/x86/kvm/mmu/mmu.c

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2

arch/x86/kvm/mmu/mmu_audit.c

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10

arch/x86/kvm/mmu/mmu_internal.h

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