From: Avi Kivity <a...@redhat.com>
On Intel, we call skip_emulated_instruction() even if we injected a #GP,
resulting in the #GP pointing at the wrong address.
Fix by injecting the exception and skipping the instruction at the same place,
so we can do just one or the other.
Signed-off-by: Avi Kivity <a...@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b237084..ea8c319 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -599,7 +599,7 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16
tss_selector, int reason,
int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
-void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
+int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val);
int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val);
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index eb4703f..a6322af 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3192,8 +3192,8 @@ static int handle_cr(struct kvm_vcpu *vcpu)
skip_emulated_instruction(vcpu);
return 1;
case 4:
- kvm_set_cr4(vcpu, val);
- skip_emulated_instruction(vcpu);
+ err = kvm_set_cr4(vcpu, val);
+ complete_insn_gp(vcpu, err);
return 1;
case 8: {
u8 cr8_prev = kvm_get_cr8(vcpu);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 1e0337a..b3eeb24 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -531,7 +531,7 @@ static void update_cpuid(struct kvm_vcpu *vcpu)
}
}
-int __kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
+int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
unsigned long old_cr4 = kvm_read_cr4(vcpu);
unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE;
@@ -563,12 +563,6 @@ int __kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
return 0;
}
-
-void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
-{
- if (__kvm_set_cr4(vcpu, cr4))
- kvm_inject_gp(vcpu, 0);
-}
EXPORT_SYMBOL_GPL(kvm_set_cr4);
static int __kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
@@ -3735,7 +3729,7 @@ static int emulator_set_cr(int cr, unsigned long val,
struct kvm_vcpu *vcpu)
res = __kvm_set_cr3(vcpu, val);
break;
case 4:
- res = __kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
+ res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
break;
case 8:
res = __kvm_set_cr8(vcpu, val & 0xfUL);
--
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