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Message-Id: <20190106192345.13578-4-ahmedsoliman@mena.vt.edu>
Date: Sun, 6 Jan 2019 21:23:37 +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 V8 03/11] 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 098df7d135..bbfe3f2863 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1053,6 +1053,13 @@ 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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