* [RFC][PATCH 3/7] KVM: MMU: Add Two Level Paging (TLP)
@ 2008-02-01 8:23 Yang, Sheng
0 siblings, 0 replies; only message in thread
From: Yang, Sheng @ 2008-02-01 8:23 UTC (permalink / raw)
To: Avi Kivity; +Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f
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From 22895ad4778189242dd546c98709bcd3fadb0cf6 Mon Sep 17 00:00:00 2001
From: Sheng Yang <sheng.yang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Date: Fri, 1 Feb 2008 06:32:19 +0800
Subject: [PATCH] KVM: MMU: Add Two Level Paging (TLP)
For EPT's path is very different from NPT's, the return value of the function
tlp_enable() indicate if EPT exists, then set up proper path.
Signed-off-by: Sheng Yang <sheng.yang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
arch/x86/kvm/mmu.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 69 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 635e70c..14de6d0 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1188,6 +1188,55 @@ static void paging_free(struct kvm_vcpu *vcpu)
#include "paging_tmpl.h"
#undef PTTYPE
+static int ept_paging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
+ u32 error_code)
+{
+ /* No paging fault for EPT */
+ BUG();
+ return -1;
+}
+
+static void ept_paging_free(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.mmu.root_hpa = INVALID_PAGE;
+}
+
+static void ept_paging_prefetch_page(struct kvm_vcpu *vcpu,
+ struct kvm_mmu_page *sp)
+{
+ BUG();
+}
+
+static int init_kvm_tlp_mmu(struct kvm_vcpu *vcpu)
+{
+ struct kvm_mmu *context = &vcpu->arch.mmu;
+
+ context->new_cr3 = nonpaging_new_cr3;
+ context->shadow_root_level = 0;
+ context->root_hpa = INVALID_PAGE;
+
+ if (kvm_x86_ops->tlp_enabled() == KVM_TLP_EPT) {
+ context->page_fault = ept_paging_page_fault;
+ context->free = ept_paging_free;
+ context->prefetch_page = ept_paging_prefetch_page;
+ }
+
+ if (!is_paging(vcpu)) {
+ context->gva_to_gpa = nonpaging_gva_to_gpa;
+ context->root_level = 0;
+ } else if (is_long_mode(vcpu)) {
+ context->gva_to_gpa = paging64_gva_to_gpa;
+ context->root_level = PT64_ROOT_LEVEL;
+ } else if (is_pae(vcpu)) {
+ context->gva_to_gpa = paging64_gva_to_gpa;
+ context->root_level = PT32E_ROOT_LEVEL;
+ } else {
+ context->gva_to_gpa = paging32_gva_to_gpa;
+ context->root_level = PT32_ROOT_LEVEL;
+ }
+ return 0;
+}
+
static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level)
{
struct kvm_mmu *context = &vcpu->arch.mmu;
@@ -1229,7 +1278,7 @@ static int paging32E_init_context(struct kvm_vcpu *vcpu)
return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL);
}
-static int init_kvm_mmu(struct kvm_vcpu *vcpu)
+static int init_kvm_softmmu(struct kvm_vcpu *vcpu)
{
ASSERT(vcpu);
ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa));
@@ -1244,6 +1293,14 @@ static int init_kvm_mmu(struct kvm_vcpu *vcpu)
return paging32_init_context(vcpu);
}
+static int init_kvm_mmu(struct kvm_vcpu *vcpu)
+{
+ if (kvm_x86_ops->tlp_enabled())
+ return init_kvm_tlp_mmu(vcpu);
+ else
+ return init_kvm_softmmu(vcpu);
+}
+
static void destroy_kvm_mmu(struct kvm_vcpu *vcpu)
{
ASSERT(vcpu);
@@ -1264,6 +1321,15 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu)
{
int r;
+ if (kvm_x86_ops->tlp_enabled() == KVM_TLP_EPT) {
+ if (!is_paging(vcpu))
+ vcpu->arch.mmu.root_hpa =
+ VMX_EPT_IDENTITY_PAGETABLE_ADDR;
+ else
+ vcpu->arch.mmu.root_hpa = vcpu->arch.cr3;
+ kvm_x86_ops->set_cr3(vcpu, vcpu->arch.mmu.root_hpa);
+ return 0;
+ }
r = mmu_topup_memory_caches(vcpu);
if (r)
goto out;
@@ -1280,7 +1346,8 @@ EXPORT_SYMBOL_GPL(kvm_mmu_load);
void kvm_mmu_unload(struct kvm_vcpu *vcpu)
{
- mmu_free_roots(vcpu);
+ if (kvm_x86_ops->tlp_enabled() != KVM_TLP_EPT)
+ mmu_free_roots(vcpu);
}
static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,
--
debian.1.5.3.7.1-dirty
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From 22895ad4778189242dd546c98709bcd3fadb0cf6 Mon Sep 17 00:00:00 2001
From: Sheng Yang <sheng.yang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Date: Fri, 1 Feb 2008 06:32:19 +0800
Subject: [PATCH] KVM: MMU: Add Two Level Paging (TLP)
For EPT's path is very different from NPT's, the return value of the function
tlp_enable() indicate if EPT exists, then set up proper path.
Signed-off-by: Sheng Yang <sheng.yang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
arch/x86/kvm/mmu.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 69 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 635e70c..14de6d0 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1188,6 +1188,55 @@ static void paging_free(struct kvm_vcpu *vcpu)
#include "paging_tmpl.h"
#undef PTTYPE
+static int ept_paging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
+ u32 error_code)
+{
+ /* No paging fault for EPT */
+ BUG();
+ return -1;
+}
+
+static void ept_paging_free(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.mmu.root_hpa = INVALID_PAGE;
+}
+
+static void ept_paging_prefetch_page(struct kvm_vcpu *vcpu,
+ struct kvm_mmu_page *sp)
+{
+ BUG();
+}
+
+static int init_kvm_tlp_mmu(struct kvm_vcpu *vcpu)
+{
+ struct kvm_mmu *context = &vcpu->arch.mmu;
+
+ context->new_cr3 = nonpaging_new_cr3;
+ context->shadow_root_level = 0;
+ context->root_hpa = INVALID_PAGE;
+
+ if (kvm_x86_ops->tlp_enabled() == KVM_TLP_EPT) {
+ context->page_fault = ept_paging_page_fault;
+ context->free = ept_paging_free;
+ context->prefetch_page = ept_paging_prefetch_page;
+ }
+
+ if (!is_paging(vcpu)) {
+ context->gva_to_gpa = nonpaging_gva_to_gpa;
+ context->root_level = 0;
+ } else if (is_long_mode(vcpu)) {
+ context->gva_to_gpa = paging64_gva_to_gpa;
+ context->root_level = PT64_ROOT_LEVEL;
+ } else if (is_pae(vcpu)) {
+ context->gva_to_gpa = paging64_gva_to_gpa;
+ context->root_level = PT32E_ROOT_LEVEL;
+ } else {
+ context->gva_to_gpa = paging32_gva_to_gpa;
+ context->root_level = PT32_ROOT_LEVEL;
+ }
+ return 0;
+}
+
static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level)
{
struct kvm_mmu *context = &vcpu->arch.mmu;
@@ -1229,7 +1278,7 @@ static int paging32E_init_context(struct kvm_vcpu *vcpu)
return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL);
}
-static int init_kvm_mmu(struct kvm_vcpu *vcpu)
+static int init_kvm_softmmu(struct kvm_vcpu *vcpu)
{
ASSERT(vcpu);
ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa));
@@ -1244,6 +1293,14 @@ static int init_kvm_mmu(struct kvm_vcpu *vcpu)
return paging32_init_context(vcpu);
}
+static int init_kvm_mmu(struct kvm_vcpu *vcpu)
+{
+ if (kvm_x86_ops->tlp_enabled())
+ return init_kvm_tlp_mmu(vcpu);
+ else
+ return init_kvm_softmmu(vcpu);
+}
+
static void destroy_kvm_mmu(struct kvm_vcpu *vcpu)
{
ASSERT(vcpu);
@@ -1264,6 +1321,15 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu)
{
int r;
+ if (kvm_x86_ops->tlp_enabled() == KVM_TLP_EPT) {
+ if (!is_paging(vcpu))
+ vcpu->arch.mmu.root_hpa =
+ VMX_EPT_IDENTITY_PAGETABLE_ADDR;
+ else
+ vcpu->arch.mmu.root_hpa = vcpu->arch.cr3;
+ kvm_x86_ops->set_cr3(vcpu, vcpu->arch.mmu.root_hpa);
+ return 0;
+ }
r = mmu_topup_memory_caches(vcpu);
if (r)
goto out;
@@ -1280,7 +1346,8 @@ EXPORT_SYMBOL_GPL(kvm_mmu_load);
void kvm_mmu_unload(struct kvm_vcpu *vcpu)
{
- mmu_free_roots(vcpu);
+ if (kvm_x86_ops->tlp_enabled() != KVM_TLP_EPT)
+ mmu_free_roots(vcpu);
}
static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,
--
debian.1.5.3.7.1-dirty
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