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Date: Fri,  7 Dec 2018 14:47:56 +0200
From: Ahmed Abd El Mawgood <ahmedsoliman@...a.vt.edu>
To: Paolo Bonzini <pbonzini@...hat.com>,
	rkrcmar@...hat.com,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	hpa@...or.com,
	x86@...nel.org,
	kvm@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	ahmedsoliman0x666@...il.com,
	ovich00@...il.com,
	kernel-hardening@...ts.openwall.com,
	nigel.edwards@....com,
	Boris Lukashev <blukashev@...pervictus.com>,
	Igor Stoppa <igor.stoppa@...il.com>
Cc: Ahmed Abd El Mawgood <ahmedsoliman@...a.vt.edu>
Subject: [PATCH 03/10] KVM: X86: Add helper function to convert SPTE to GFN

Signed-off-by: Ahmed Abd El Mawgood <ahmedsoliman@...a.vt.edu>
---
 arch/x86/kvm/mmu.c | 7 +++++++
 arch/x86/kvm/mmu.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index b67d743c33..a300e4acb8 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1024,6 +1024,13 @@ static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index)
 
 	return sp->gfn + (index << ((sp->role.level - 1) * PT64_LEVEL_BITS));
 }
+gfn_t spte_to_gfn(u64 *spte)
+{
+	struct kvm_mmu_page *sp;
+
+	sp = page_header(__pa(spte));
+	return kvm_mmu_page_get_gfn(sp, spte - sp->spt);
+}
 
 static void kvm_mmu_page_set_gfn(struct kvm_mmu_page *sp, int index, gfn_t gfn)
 {
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index c7b333147c..49d7f2f002 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -211,4 +211,5 @@ void kvm_mmu_gfn_allow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);
 bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
 				    struct kvm_memory_slot *slot, u64 gfn);
 int kvm_arch_write_log_dirty(struct kvm_vcpu *vcpu);
+gfn_t spte_to_gfn(u64 *sptep);
 #endif
-- 
2.19.2

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