KVM: aarch64: implement KVM_CAP_SET_GUEST_DEBUG2

Move KVM_GUESTDBG_VALID_MASK to kvm_host.h
and use it to return the value of this capability.
Compile tested only.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210401135451.1004564-5-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/arm64/include/asm/kvm_host.h

@@ -401,6 +401,10 @@ struct kvm_vcpu_arch {
 #define KVM_ARM64_PENDING_EXCEPTION	(1 << 8) /* Exception pending */
 #define KVM_ARM64_EXCEPT_MASK		(7 << 9) /* Target EL/MODE */
 
+#define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
+				 KVM_GUESTDBG_USE_SW_BP | \
+				 KVM_GUESTDBG_USE_HW | \
+				 KVM_GUESTDBG_SINGLESTEP)
 /*
  * When KVM_ARM64_PENDING_EXCEPTION is set, KVM_ARM64_EXCEPT_MASK can
  * take the following values:

arch/arm64/kvm/arm.c

@@ -208,6 +208,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_VCPU_ATTRIBUTES:
 		r = 1;
 		break;
+	case KVM_CAP_SET_GUEST_DEBUG2:
+		return KVM_GUESTDBG_VALID_MASK;
 	case KVM_CAP_ARM_SET_DEVICE_ADDR:
 		r = 1;
 		break;

arch/arm64/kvm/guest.c

@@ -888,11 +888,6 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 	return -EINVAL;
 }
 
-#define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE |    \
-			    KVM_GUESTDBG_USE_SW_BP | \
-			    KVM_GUESTDBG_USE_HW | \
-			    KVM_GUESTDBG_SINGLESTEP)
-
 /**
  * kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging
  * @kvm:	pointer to the KVM struct