This adds helper methods to get segment limits for kvm_x86_ops and x86_emulate_ops. Hooks are added for SVM and VMX
Signed-off-by: Mohammed Gamal <m.gamal005@xxxxxxxxx>
---
arch/x86/include/asm/kvm_emulate.h | 1 +
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/svm.c | 8 ++++++++
arch/x86/kvm/vmx.c | 8 ++++++++
arch/x86/kvm/x86.c | 12 ++++++++++++
5 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index 51cfd73..ce90048 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -138,6 +138,7 @@ struct x86_emulate_ops {
u16 (*get_segment_selector)(int seg, struct kvm_vcpu *vcpu);
void (*set_segment_selector)(u16 sel, int seg, struct kvm_vcpu *vcpu);
unsigned long (*get_cached_segment_base)(int seg, struct kvm_vcpu *vcpu);
+ u32 (*get_cached_segment_limit)(int seg, struct kvm_vcpu *vcpu);
void (*get_gdt)(struct desc_ptr *dt, struct kvm_vcpu *vcpu);
ulong (*get_cr)(int cr, struct kvm_vcpu *vcpu);
int (*set_cr)(int cr, ulong val, struct kvm_vcpu *vcpu);
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 502e53f..e32efc4 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -468,6 +468,7 @@ struct kvm_x86_ops {
int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
+ u32 (*get_segment_limit)(struct kvm_vcpu *vcpu, int seg);
void (*get_segment)(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg);
int (*get_cpl)(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 56c9b6b..504761d 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1038,6 +1038,13 @@ static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
return s->base;
}
+static u32 svm_get_segment_limit(struct kvm_vcpu *vcpu, int seg)
+{
+ struct vmcb_seg *s = svm_seg(vcpu, seg);
+
+ return s->limit;
+}
+
static void svm_get_segment(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg)
{
@@ -3461,6 +3468,7 @@ static struct kvm_x86_ops svm_x86_ops = {
.get_msr = svm_get_msr,
.set_msr = svm_set_msr,
.get_segment_base = svm_get_segment_base,
+ .get_segment_limit = svm_get_segment_limit,
.get_segment = svm_get_segment,
.set_segment = svm_set_segment,
.get_cpl = svm_get_cpl,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2fdcc98..4e2626b 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2001,6 +2001,13 @@ static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
return vmcs_readl(sf->base);
}
+static u32 vmx_get_segment_limit(struct kvm_vcpu *vcpu, int seg)
+{
+ struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
+
+ return vmcs_read32(sf->limit);
+}
+
static void vmx_get_segment(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg)
{
@@ -4304,6 +4311,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
.get_msr = vmx_get_msr,
.set_msr = vmx_set_msr,
.get_segment_base = vmx_get_segment_base,
+ .get_segment_limit = vmx_get_segment_limit,
.get_segment = vmx_get_segment,
.set_segment = vmx_set_segment,
.get_cpl = vmx_get_cpl,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6ed3176..d5a231b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3674,6 +3674,11 @@ static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
return kvm_x86_ops->get_segment_base(vcpu, seg);
}
+static u32 get_segment_limit (struct kvm_vcpu *vcpu, int seg)
+{
+ return kvm_x86_ops->get_segment_limit(vcpu, seg);
+}
+
int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
{
kvm_mmu_invlpg(vcpu, address);
@@ -3790,6 +3795,12 @@ static unsigned long emulator_get_cached_segment_base(int seg,
return get_segment_base(vcpu, seg);
}
+static u32 emulate_get_cached_segment_limit(int seg,
+ struct kvm_vcpu *vcpu)
+{
+ return get_segment_limit(vcpu, seg);
+}
+
static bool emulator_get_cached_descriptor(struct desc_struct *desc, int seg,
struct kvm_vcpu *vcpu)
{
@@ -3876,6 +3887,7 @@ static struct x86_emulate_ops emulate_ops = {
.get_segment_selector = emulator_get_segment_selector,
.set_segment_selector = emulator_set_segment_selector,
.get_cached_segment_base = emulator_get_cached_segment_base,
+ .get_cached_segment_limit = emulate_get_cached_segment_limit,
.get_gdt = emulator_get_gdt,
.get_cr = emulator_get_cr,
.set_cr = emulator_set_cr,
--
1.7.0.4
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