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(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 98e4f2b..de5f615 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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(¤t->mm->mmap_sem);
+ kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
+ VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT);
+ up_read(¤t->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:
diff --git a/arch/x86/kvm/vmx.h b/arch/x86/kvm/vmx.h
index 093b085..f97eccc 100644
--- a/arch/x86/kvm/vmx.h
+++ b/arch/x86/kvm/vmx.h
@@ -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
diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index 715f7b9..f03ef75 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -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(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 98e4f2b..de5f615 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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(¤t->mm->mmap_sem);
+ kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
+ VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT);
+ up_read(¤t->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:
diff --git a/arch/x86/kvm/vmx.h b/arch/x86/kvm/vmx.h
index 093b085..f97eccc 100644
--- a/arch/x86/kvm/vmx.h
+++ b/arch/x86/kvm/vmx.h
@@ -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
diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index 715f7b9..f03ef75 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -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
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