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authorAvi Kivity <avi@redhat.com>2009-12-29 18:43:06 +0200
committerMarcelo Tosatti <mtosatti@redhat.com>2010-03-01 12:35:50 -0300
commite8467fda83cdc9de53972fee0cd2e6916cf66f41 (patch)
tree3a1644bf9b26f29eee74614f70e9d9a82c079ea9
parent4d4ec0874583b127caac1d0f84033c8971b2fd2a (diff)
KVM: VMX: Allow the guest to own some cr0 bits
We will use this later to give the guest ownership of cr0.ts. Signed-off-by: Avi Kivity <avi@redhat.com>
-rw-r--r--arch/x86/include/asm/kvm_host.h2
-rw-r--r--arch/x86/kvm/kvm_cache_regs.h2
-rw-r--r--arch/x86/kvm/svm.c5
-rw-r--r--arch/x86/kvm/vmx.c9
4 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index a4de557ad73..693046a7a12 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -269,6 +269,7 @@ struct kvm_vcpu_arch {
u32 regs_dirty;
unsigned long cr0;
+ unsigned long cr0_guest_owned_bits;
unsigned long cr2;
unsigned long cr3;
unsigned long cr4;
@@ -489,6 +490,7 @@ struct kvm_x86_ops {
void (*set_segment)(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg);
void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
+ void (*decache_cr0_guest_bits)(struct kvm_vcpu *vcpu);
void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
diff --git a/arch/x86/kvm/kvm_cache_regs.h b/arch/x86/kvm/kvm_cache_regs.h
index f46859751b3..6b419a36cbd 100644
--- a/arch/x86/kvm/kvm_cache_regs.h
+++ b/arch/x86/kvm/kvm_cache_regs.h
@@ -40,6 +40,8 @@ static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index)
static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask)
{
+ if (mask & vcpu->arch.cr0_guest_owned_bits)
+ kvm_x86_ops->decache_cr0_guest_bits(vcpu);
return vcpu->arch.cr0 & mask;
}
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d3246ce70ae..3899c2d1983 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -956,6 +956,10 @@ static void svm_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
svm->vmcb->save.gdtr.base = dt->base ;
}
+static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
+{
+}
+
static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
{
}
@@ -2948,6 +2952,7 @@ static struct kvm_x86_ops svm_x86_ops = {
.set_segment = svm_set_segment,
.get_cpl = svm_get_cpl,
.get_cs_db_l_bits = kvm_get_cs_db_l_bits,
+ .decache_cr0_guest_bits = svm_decache_cr0_guest_bits,
.decache_cr4_guest_bits = svm_decache_cr4_guest_bits,
.set_cr0 = svm_set_cr0,
.set_cr3 = svm_set_cr3,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 4c7177c489a..dbcdb55094f 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1653,6 +1653,14 @@ static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
}
+static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
+{
+ ulong cr0_guest_owned_bits = vcpu->arch.cr0_guest_owned_bits;
+
+ vcpu->arch.cr0 &= ~cr0_guest_owned_bits;
+ vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & cr0_guest_owned_bits;
+}
+
static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
{
ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits;
@@ -4106,6 +4114,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
.set_segment = vmx_set_segment,
.get_cpl = vmx_get_cpl,
.get_cs_db_l_bits = vmx_get_cs_db_l_bits,
+ .decache_cr0_guest_bits = vmx_decache_cr0_guest_bits,
.decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
.set_cr0 = vmx_set_cr0,
.set_cr3 = vmx_set_cr3,