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Subject[PATCH 03/10] KVM: X86: Add helper function to convert SPTE to GFN
Date
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
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