linux-kernel - [PATCH V4 10/15] KVM: Add spte's point in the struct kvm_mmu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20181013145406.4911-11-Tianyu.Lan@microsoft.com>
Date:   Sat, 13 Oct 2018 22:54:01 +0800
From:   lantianyu1986@...il.com
To:     unlisted-recipients:; (no To-header on input)
Cc:     Lan Tianyu <Tianyu.Lan@...rosoft.com>, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, x86@...nel.org,
        pbonzini@...hat.com, rkrcmar@...hat.com,
        devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, michael.h.kelley@...rosoft.com,
        vkuznets@...hat.com
Subject: [PATCH V4 10/15] KVM: Add spte's point in the struct kvm_mmu_page

From: Lan Tianyu <Tianyu.Lan@...rosoft.com>

It's necessary to check whether mmu page is last or large page when add
mmu page into flush list. "spte" is needed for such check and so add
spte point in the struct kvm_mmu_page.

Signed-off-by: Lan Tianyu <Tianyu.Lan@...rosoft.com>
---
 arch/x86/include/asm/kvm_host.h | 1 +
 arch/x86/kvm/mmu.c              | 5 +++++
 arch/x86/kvm/paging_tmpl.h      | 2 ++
 3 files changed, 8 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 8279235285f8..c986ebefc9ac 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -333,6 +333,7 @@ struct kvm_mmu_page {
 	int root_count;          /* Currently serving as active root */
 	unsigned int unsync_children;
 	struct kvm_rmap_head parent_ptes; /* rmap pointers to parent sptes */
+	u64 *sptep;
 
 	/* The page is obsolete if mmu_valid_gen != kvm->arch.mmu_valid_gen.  */
 	unsigned long mmu_valid_gen;
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index e984a0067a43..393f4048dd7a 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3165,6 +3165,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, int write, int map_writable,
 			pseudo_gfn = base_addr >> PAGE_SHIFT;
 			sp = kvm_mmu_get_page(vcpu, pseudo_gfn, iterator.addr,
 					      iterator.level - 1, 1, ACC_ALL);
+			sp->sptep = iterator.sptep;
 
 			link_shadow_page(vcpu, iterator.sptep, sp);
 		}
@@ -3602,6 +3603,7 @@ static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
 		sp = kvm_mmu_get_page(vcpu, 0, 0,
 				vcpu->arch.mmu->shadow_root_level, 1, ACC_ALL);
 		++sp->root_count;
+		sp->sptep = NULL;
 		spin_unlock(&vcpu->kvm->mmu_lock);
 		vcpu->arch.mmu->root_hpa = __pa(sp->spt);
 	} else if (vcpu->arch.mmu->shadow_root_level == PT32E_ROOT_LEVEL) {
@@ -3618,6 +3620,7 @@ static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
 					i << 30, PT32_ROOT_LEVEL, 1, ACC_ALL);
 			root = __pa(sp->spt);
 			++sp->root_count;
+			sp->sptep = NULL;
 			spin_unlock(&vcpu->kvm->mmu_lock);
 			vcpu->arch.mmu->pae_root[i] = root | PT_PRESENT_MASK;
 		}
@@ -3658,6 +3661,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
 				vcpu->arch.mmu->shadow_root_level, 0, ACC_ALL);
 		root = __pa(sp->spt);
 		++sp->root_count;
+		sp->sptep = NULL;
 		spin_unlock(&vcpu->kvm->mmu_lock);
 		vcpu->arch.mmu->root_hpa = root;
 		return 0;
@@ -3695,6 +3699,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
 				      0, ACC_ALL);
 		root = __pa(sp->spt);
 		++sp->root_count;
+		sp->sptep = NULL;
 		spin_unlock(&vcpu->kvm->mmu_lock);
 
 		vcpu->arch.mmu->pae_root[i] = root | pm_mask;
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 6bdca39829bc..833e8855bbc9 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -633,6 +633,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
 			table_gfn = gw->table_gfn[it.level - 2];
 			sp = kvm_mmu_get_page(vcpu, table_gfn, addr, it.level-1,
 					      false, access);
+			sp->sptep = it.sptep;
 		}
 
 		/*
@@ -663,6 +664,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
 
 		sp = kvm_mmu_get_page(vcpu, direct_gfn, addr, it.level-1,
 				      true, direct_access);
+		sp->sptep = it.sptep;
 		link_shadow_page(vcpu, it.sptep, sp);
 	}
 
-- 
2.14.4