[PATCH 4.9 23/31] KVM: x86: Add is_executable_pte()

From: Ben Hutchings ben@decadent.org.uk

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 --- arch/x86/kvm/mmu.c | 5 +++++ 1 file changed, 5 insertions(+)

--- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -338,6 +338,11 @@ static int is_last_spte(u64 pte, int lev 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;