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KVM: x86: Add is_executable_pte()

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Extracted from commit d3e328f2cb01 "kvm: x86: mmu: Verify that
restored PTE has needed perms in fast page fault".

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ben Hutchings 2019-10-19 18:10:55 +01:00 committed by Greg Kroah-Hartman
parent 515fa37a3e
commit 9dc6bc3f22
1 changed files with 5 additions and 0 deletions
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arch/x86/kvm/mmu.c
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@ -338,6 +338,11 @@ static int is_last_spte(u64 pte, int level)
return 0;
}
static bool is_executable_pte(u64 spte)
{
return (spte & (shadow_x_mask | shadow_nx_mask)) == shadow_x_mask;
}
static kvm_pfn_t spte_to_pfn(u64 pte)
{
return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;