linux-kernel - [PATCH 4.9 23/31] KVM: x86: Add is_executable

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Message-Id: <20191115062018.378810254@linuxfoundation.org>
Date:   Fri, 15 Nov 2019 14:20:52 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ben Hutchings <ben@...adent.org.uk>
Subject: [PATCH 4.9 23/31] KVM: x86: Add is_executable_pte()

From: Ben Hutchings <ben@...adent.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@...adent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;