From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ahmed Abd El Mawgood Subject: [RESEND PATCH V8 03/11] KVM: X86: Add helper function to convert SPTE to GFN Date: Mon, 21 Jan 2019 01:39:32 +0200 Message-Id: <20190120233940.15282-4-ahmedsoliman@mena.vt.edu> In-Reply-To: <20190120233940.15282-1-ahmedsoliman@mena.vt.edu> References: <20190120233940.15282-1-ahmedsoliman@mena.vt.edu> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit To: Paolo Bonzini , rkrcmar@redhat.com, Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , 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 , Igor Stoppa Cc: Ahmed Abd El Mawgood List-ID: Signed-off-by: Ahmed Abd El Mawgood --- 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