KVM: x86/mmu: use kvm_page_format to test SPTEs

is_access_allowed(), and is_executable_pte() within it, are effectively a
special version of permission_fault() that only supports a subset of roles.
In particular it does not allow SMEP, SMAP and PKE; while SMAP and PKE are
not a problem (they are not supported by EPT/NPT and is_access_allowed() is
only used for either EPT/NPT or CR0.PG=0), lack of ring-0 execution checks
support means that KVM can only use MBEC and GMET with shadow paging.

Replace is_access_allowed() with a modified version of permission_fault(),
looking at the same bitmasks but using the struct kvm_mmu's fmt member;
the new version supports MBEC/GMET for free, just by virtue of filling
in the ACC_* masks from the SPTE.

This prepares for a possible future where TDP entries could have XS!=XU,
for example as part of implementing Hyper-V VSM natively inside KVM.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

0 files changed, 0 insertions, 0 deletions