[1/3] KVM: Fix mov cr0 #GP at wrong instruction

Commit Message

Avi Kivity June 10, 2010, 2:02 p.m. UTC

None

Patch

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 0cd0f29..f0683c8 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -596,7 +596,7 @@  int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg);
 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
 		    bool has_error_code, u32 error_code);
 
-void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
+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);
 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2ae0c39..6d1616d 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -807,7 +807,7 @@  static void init_vmcb(struct vcpu_svm *svm)
 	 * svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0.
 	 */
 	svm->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET;
-	kvm_set_cr0(&svm->vcpu, svm->vcpu.arch.cr0);
+	(void)kvm_set_cr0(&svm->vcpu, svm->vcpu.arch.cr0);
 
 	save->cr4 = X86_CR4_PAE;
 	/* rdx = ?? */
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7fa6ea7..a6a5121 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3158,11 +3158,20 @@  vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
 	hypercall[2] = 0xc1;
 }
 
+static void complete_insn_gp(struct kvm_vcpu *vcpu, int err)
+{
+	if (err)
+		kvm_inject_gp(vcpu, 0);
+	else
+		skip_emulated_instruction(vcpu);
+}
+
 static int handle_cr(struct kvm_vcpu *vcpu)
 {
 	unsigned long exit_qualification, val;
 	int cr;
 	int reg;
+	int err;
 
 	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
 	cr = exit_qualification & 15;
@@ -3173,8 +3182,8 @@  static int handle_cr(struct kvm_vcpu *vcpu)
 		trace_kvm_cr_write(cr, val);
 		switch (cr) {
 		case 0:
-			kvm_set_cr0(vcpu, val);
-			skip_emulated_instruction(vcpu);
+			err = kvm_set_cr0(vcpu, val);
+			complete_insn_gp(vcpu, err);
 			return 1;
 		case 3:
 			kvm_set_cr3(vcpu, val);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5fa8684..72df8fd 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -417,7 +417,7 @@  out:
 	return changed;
 }
 
-static int __kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
+int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 {
 	unsigned long old_cr0 = kvm_read_cr0(vcpu);
 	unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
@@ -460,17 +460,11 @@  static int __kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 		kvm_mmu_reset_context(vcpu);
 	return 0;
 }
-
-void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
-{
-	if (__kvm_set_cr0(vcpu, cr0))
-		kvm_inject_gp(vcpu, 0);
-}
 EXPORT_SYMBOL_GPL(kvm_set_cr0);
 
 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 {
-	kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
+	(void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
 }
 EXPORT_SYMBOL_GPL(kvm_lmsw);
 
@@ -3652,7 +3646,7 @@  static int emulator_set_cr(int cr, unsigned long val, struct kvm_vcpu *vcpu)
 
 	switch (cr) {
 	case 0:
-		res = __kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
+		res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
 		break;
 	case 2:
 		vcpu->arch.cr2 = val;