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KVM: VMX: Perpare a identity page table for EPT in real mode

PATCH In review Yang, Sheng 1 participant 1 message Apr 25, 2008

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Yang, Sheng

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PATCH 7/8 KVM: VMX: Perpare a identity page table for EPT in real mode

From 30448ffed0d5dad04d0538a53661764128cf05f5 Mon Sep 17 00:00:00 2001
From: Sheng Yang <[email protected]>
Date: Fri, 25 Apr 2008 21:44:52 +0800
Subject: [PATCH 7/8] KVM: VMX: Perpare a identity page table for EPT in real mode

Signed-off-by Sheng Yang <[email protected]>
---
 arch/x86/kvm/vmx.c         |   79 
++++++++++++++++++++++++++++++++++++++++++--
 arch/x86/kvm/vmx.h         |    3 ++
 include/asm-x86/kvm_host.h |    3 ++
 3 files changed, 82 insertions(+), 3 deletions(-)
arch/x86/kvm/vmx.c +72 -3
index 98e4f2b..de5f615 100644
@@ -87,7 +87,7 @@ static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
 	return container_of(vcpu, struct vcpu_vmx, vcpu);
 }
 
-static int init_rmode_tss(struct kvm *kvm);
+static int init_rmode(struct kvm *kvm);
 
 static DEFINE_PER_CPU(struct vmcs *, vmxarea);
 static DEFINE_PER_CPU(struct vmcs *, current_vmcs);

@@ -1304,7 +1304,7 @@ static void enter_rmode(struct kvm_vcpu *vcpu)
 	fix_rmode_seg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
 
 	kvm_mmu_reset_context(vcpu);
-	init_rmode_tss(vcpu->kvm);
+	init_rmode(vcpu->kvm);
 }
 
 #ifdef CONFIG_X86_64

@@ -1578,6 +1578,41 @@ out:
 	return ret;
 }
 
+static int init_rmode_identity_map(struct kvm *kvm)
+{
+	int i, r, ret;
+	pfn_t identity_map_pfn;
+	u32 tmp;
+
+	if (!vm_need_ept())
+		return 1;
+	if (unlikely(!kvm->arch.ept_identity_pagetable)) {
+		printk(KERN_ERR "EPT: identity-mapping pagetable "
+			"haven't been allocated!\n");
+		return 0;
+	}
+	if (likely(kvm->arch.ept_identity_pagetable_done))
+		return 1;
+	ret = 0;
+	identity_map_pfn = VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT;
+	r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
+	if (r < 0)
+		goto out;
+	/* Set up identity-mapping pagetable for EPT in real mode */
+	for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
+		tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
+			_PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
+		r = kvm_write_guest_page(kvm, identity_map_pfn,
+				&tmp, i * sizeof(tmp), sizeof(tmp));
+		if (r < 0)
+			goto out;
+	}
+	kvm->arch.ept_identity_pagetable_done = true;
+	ret = 1;
+out:
+	return ret;
+}
+
 static void seg_setup(int seg)
 {
 	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];

@@ -1612,6 +1647,31 @@ out:
 	return r;
 }
 
+static int alloc_identity_pagetable(struct kvm *kvm)
+{
+	struct kvm_userspace_memory_region kvm_userspace_mem;
+	int r = 0;
+
+	down_write(&kvm->slots_lock);
+	if (kvm->arch.ept_identity_pagetable)
+		goto out;
+	kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
+	kvm_userspace_mem.flags = 0;
+	kvm_userspace_mem.guest_phys_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR;
+	kvm_userspace_mem.memory_size = PAGE_SIZE;
+	r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
+	if (r)
+		goto out;
+
+	down_read(&current->mm->mmap_sem);
+	kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
+			VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT);
+	up_read(&current->mm->mmap_sem);
+out:
+	up_write(&kvm->slots_lock);
+	return r;
+}
+
 static void allocate_vpid(struct vcpu_vmx *vmx)
 {
 	int vpid;

@@ -1775,6 +1835,15 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
 	return 0;
 }
 
+static int init_rmode(struct kvm *kvm)
+{
+	if (!init_rmode_tss(kvm))
+		return 0;
+	if (!init_rmode_identity_map(kvm))
+		return 0;
+	return 1;
+}
+
 static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);

@@ -1782,7 +1851,7 @@ static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
 	int ret;
 
 	down_read(&vcpu->kvm->slots_lock);
-	if (!init_rmode_tss(vmx->vcpu.kvm)) {
+	if (!init_rmode(vmx->vcpu.kvm)) {
 		ret = -ENOMEM;
 		goto out;
 	}

@@ -2759,6 +2828,10 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm

*kvm, unsigned int id)
if (alloc_apic_access_page(kvm) != 0)
goto free_vmcs;

+ if (vm_need_ept())
+ if (alloc_identity_pagetable(kvm) != 0)
+ goto free_vmcs;
+
return &vmx->vcpu;

free_vmcs:

arch/x86/kvm/vmx.h +3 -0
index 093b085..f97eccc 100644
@@ -340,6 +340,7 @@ enum vmcs_field {
 #define MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED  0x4
 
 #define APIC_ACCESS_PAGE_PRIVATE_MEMSLOT	9
+#define IDENTITY_PAGETABLE_PRIVATE_MEMSLOT	10
 
 #define VMX_NR_VPIDS				(1 << 16)
 #define VMX_VPID_EXTENT_SINGLE_CONTEXT		1

@@ -353,4 +354,6 @@ enum vmcs_field {
 #define VMX_EPT_EXTENT_GLOBAL_BIT		(1ull << 26)
 #define VMX_EPT_DEFAULT_GAW			3
 
+#define VMX_EPT_IDENTITY_PAGETABLE_ADDR		0xfffbc000ul
+
 #endif
include/asm-x86/kvm_host.h +3 -0
index 715f7b9..f03ef75 100644
@@ -314,6 +314,9 @@ struct kvm_arch{
 	struct page *apic_access_page;
 
 	gpa_t wall_clock;
+
+	struct page *ept_identity_pagetable;
+	bool ept_identity_pagetable_done;
 };
 
 struct kvm_vm_stat {

--
1.5.4.5

From 30448ffed0d5dad04d0538a53661764128cf05f5 Mon Sep 17 00:00:00 2001
From: Sheng Yang <[email protected]>
Date: Fri, 25 Apr 2008 21:44:52 +0800
Subject: [PATCH 7/8] KVM: VMX: Perpare a identity page table for EPT in real mode

Signed-off-by Sheng Yang <[email protected]>
---
 arch/x86/kvm/vmx.c         |   79 ++++++++++++++++++++++++++++++++++++++++++--
 arch/x86/kvm/vmx.h         |    3 ++
 include/asm-x86/kvm_host.h |    3 ++
 3 files changed, 82 insertions(+), 3 deletions(-)
arch/x86/kvm/vmx.c +76 -3

121 lines not on this page · raw message

arch/x86/kvm/vmx.h +3 -0
index 093b085..f97eccc 100644
@@ -340,6 +340,7 @@ enum vmcs_field {
 #define MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED  0x4
 
 #define APIC_ACCESS_PAGE_PRIVATE_MEMSLOT	9
+#define IDENTITY_PAGETABLE_PRIVATE_MEMSLOT	10
 
 #define VMX_NR_VPIDS				(1 << 16)
 #define VMX_VPID_EXTENT_SINGLE_CONTEXT		1

@@ -353,4 +354,6 @@ enum vmcs_field {
 #define VMX_EPT_EXTENT_GLOBAL_BIT		(1ull << 26)
 #define VMX_EPT_DEFAULT_GAW			3
 
+#define VMX_EPT_IDENTITY_PAGETABLE_ADDR		0xfffbc000ul
+
 #endif
include/asm-x86/kvm_host.h +3 -0
index 715f7b9..f03ef75 100644
@@ -314,6 +314,9 @@ struct kvm_arch{
 	struct page *apic_access_page;
 
 	gpa_t wall_clock;
+
+	struct page *ept_identity_pagetable;
+	bool ept_identity_pagetable_done;
 };
 
 struct kvm_vm_stat {
Signature · 1 line
1.5.4.5

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