KVM: x86/mmu: Grab shadow root level from mmu_role for shadow MMUs

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Use the mmu_role to initialize shadow root level instead of assuming the
level of KVM's shadow root (host) is the same as that of the guest root,
or in the case of 32-bit non-PAE paging where KVM forces PAE paging.
For nested NPT, the shadow root level cannot be adapted to L1's NPT root
level and is instead always the TDP root level because NPT uses the
current host CR0/CR4/EFER, e.g. 64-bit KVM can't drop into 32-bit PAE to
shadow L1's NPT.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622175739.3610207-20-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-06-22 10:57:04 -07:00 • committed by Paolo Bonzini

parent 16be1d1292

commit d555f7057e

1 changed files with 5 additions and 13 deletions

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arch/x86/kvm/mmu/mmu.c

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