KVM: nVMX: Invoke ept_save_pdptrs() if and only if PAE paging is enabled

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Invoke ept_save_pdptrs() when restoring L1's host state on a "late"
VM-Fail if and only if PAE paging is enabled.  This saves a CALL in the
common case where L1 is a 64-bit host, and avoids incorrectly marking
the PDPTRs as dirty.

WARN if ept_save_pdptrs() is called with PAE disabled now that the
nested usage pre-checks is_pae_paging().  Barring a bug in KVM's MMU,
attempting to read the PDPTRs with PAE disabled is now impossible.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200415203454.8296-2-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2020-04-15 13:34:50 -07:00 • committed by Paolo Bonzini

parent 4dcefa312a

commit 9932b49e5a

2 changed files with 8 additions and 7 deletions

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arch/x86/kvm/vmx/nested.c

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13

arch/x86/kvm/vmx/vmx.c

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