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From:   Ahmed Abd El Mawgood <ahmedsoliman@mena.vt.edu>
To:     Paolo Bonzini <pbonzini@redhat.com>, rkrcmar@redhat.com,
        Jonathan Corbet <corbet@lwn.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        hpa@zytor.com, x86@kernel.org, kvm@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        ahmedsoliman0x666@gmail.com, ovich00@gmail.com,
        kernel-hardening@lists.openwall.com, nigel.edwards@hpe.com,
        Boris Lukashev <blukashev@sempervictus.com>,
        Igor Stoppa <igor.stoppa@gmail.com>
Cc:     Ahmed Abd El Mawgood <ahmedsoliman@mena.vt.edu>
Subject: [PATCH 03/10] KVM: X86: Add helper function to convert SPTE to GFN
Date:   Fri,  7 Dec 2018 14:47:56 +0200
Message-Id: <20181207124803.10828-4-ahmedsoliman@mena.vt.edu>
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Signed-off-by: Ahmed Abd El Mawgood <ahmedsoliman@mena.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