[PATCH] KVM: Prevent stale bits in cr0 and cr4

Hardware virtualization implementations allow the guests to freely change some
of the bits in cr0 and cr4, but trap when changing the other bits.  This is
useful to avoid excessive exits due to changing, for example, the ts flag.

It also means the kvm's copy of cr0 and cr4 may be stale with respect to these
bits.  most of the time this doesn't matter as these bits are not very
interesting.  Other times, however (for example when returning cr0 to
userspace), they are, so get the fresh contents of these bits from the guest
by means of a new arch operation.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/kvm/kvm.h

@@ -283,6 +283,7 @@ struct kvm_arch_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_cr4_guest_bits)(struct kvm_vcpu *vcpu);
 	void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
 	void (*set_cr0_no_modeswitch)(struct kvm_vcpu *vcpu,
 				      unsigned long cr0);

drivers/kvm/kvm_main.c

@@ -390,6 +390,7 @@ EXPORT_SYMBOL_GPL(set_cr0);
 
 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 {
+	kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
 	set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
 }
 EXPORT_SYMBOL_GPL(lmsw);
@@ -917,9 +918,10 @@ int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
 
 int emulate_clts(struct kvm_vcpu *vcpu)
 {
-	unsigned long cr0 = vcpu->cr0;
+	unsigned long cr0;
 
-	cr0 &= ~CR0_TS_MASK;
+	kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
+	cr0 = vcpu->cr0 & ~CR0_TS_MASK;
 	kvm_arch_ops->set_cr0(vcpu, cr0);
 	return X86EMUL_CONTINUE;
 }
@@ -1072,6 +1074,7 @@ void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
 
 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
 {
+	kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
 	switch (cr) {
 	case 0:
 		return vcpu->cr0;
@@ -1406,6 +1409,7 @@ static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
 	sregs->gdt.limit = dt.limit;
 	sregs->gdt.base = dt.base;
 
+	kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
 	sregs->cr0 = vcpu->cr0;
 	sregs->cr2 = vcpu->cr2;
 	sregs->cr3 = vcpu->cr3;
@@ -1470,6 +1474,8 @@ static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
 #endif
 	vcpu->apic_base = sregs->apic_base;
 
+	kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
+
 	mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
 	kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
 

drivers/kvm/svm.c

@@ -702,6 +702,10 @@ static void svm_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 	vcpu->svm->vmcb->save.gdtr.base = dt->base ;
 }
 
+static void svm_decache_cr0_cr4_guest_bits(struct kvm_vcpu *vcpu)
+{
+}
+
 static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 {
 #ifdef CONFIG_X86_64
@@ -1645,6 +1649,7 @@ static struct kvm_arch_ops svm_arch_ops = {
 	.get_segment = svm_get_segment,
 	.set_segment = svm_set_segment,
 	.get_cs_db_l_bits = svm_get_cs_db_l_bits,
+	.decache_cr0_cr4_guest_bits = svm_decache_cr0_cr4_guest_bits,
 	.set_cr0 = svm_set_cr0,
 	.set_cr0_no_modeswitch = svm_set_cr0,
 	.set_cr3 = svm_set_cr3,

drivers/kvm/vmx.c

@@ -737,6 +737,15 @@ static void exit_lmode(struct kvm_vcpu *vcpu)
 
 #endif
 
+static void vmx_decache_cr0_cr4_guest_bits(struct kvm_vcpu *vcpu)
+{
+	vcpu->cr0 &= KVM_GUEST_CR0_MASK;
+	vcpu->cr0 |= vmcs_readl(GUEST_CR0) & ~KVM_GUEST_CR0_MASK;
+
+	vcpu->cr4 &= KVM_GUEST_CR4_MASK;
+	vcpu->cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
+}
+
 static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 {
 	if (vcpu->rmode.active && (cr0 & CR0_PE_MASK))
@@ -2002,6 +2011,7 @@ static struct kvm_arch_ops vmx_arch_ops = {
 	.get_segment = vmx_get_segment,
 	.set_segment = vmx_set_segment,
 	.get_cs_db_l_bits = vmx_get_cs_db_l_bits,
+	.decache_cr0_cr4_guest_bits = vmx_decache_cr0_cr4_guest_bits,
 	.set_cr0 = vmx_set_cr0,
 	.set_cr0_no_modeswitch = vmx_set_cr0_no_modeswitch,
 	.set_cr3 = vmx_set_cr3,