[PATCH 1/4] KVM: x86: Move the check for upper 32 reserved bits of DR6 to separate function

[Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>]

Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>
---
 arch/x86/kvm/x86.c | 2 +-
 arch/x86/kvm/x86.h | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c17e6eb..4746ec1 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1096,7 +1096,7 @@ static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 	case 4:
 		/* fall through */
 	case 6:
-		if (val & 0xffffffff00000000ULL)
+		if (!kvm_dr6_valid(val))
 			return -1; /* #GP */
 		vcpu->arch.dr6 = (val & DR6_VOLATILE) | kvm_dr6_fixed(vcpu);
 		break;
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index b968acc..5043108 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -354,6 +354,11 @@ static inline bool kvm_dr7_valid(u64 data)
 	/* Bits [63:32] are reserved */
 	return !(data >> 32);
 }
+static inline bool kvm_dr6_valid(u64 data)
+{
+	/* Bits [63:32] are reserved */
+	return !(data >> 32);
+}
 
 void kvm_load_guest_xsave_state(struct kvm_vcpu *vcpu);
 void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu);
-- 
1.8.3.1