[v4,10/43] kvm: arm64: Expose debug HW register numbers for Realm

Commit Message

Steven Price Aug. 21, 2024, 3:38 p.m. UTC

From: Suzuki K Poulose <[e-mail]>

Expose VM specific Debug HW register numbers.

Signed-off-by: Suzuki K Poulose <[e-mail]>
Signed-off-by: Steven Price <[e-mail]>
---
 arch/arm64/kvm/arm.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

Patch

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 15c7c2cabbf7..6f3b2c907c85 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -77,6 +77,22 @@  bool is_kvm_arm_initialised(void)
 	return kvm_arm_initialised;
 }
 
+static u32 kvm_arm_get_num_brps(struct kvm *kvm)
+{
+	if (!kvm_is_realm(kvm))
+		return get_num_brps();
+	/* Realm guest is not debuggable. */
+	return 0;
+}
+
+static u32 kvm_arm_get_num_wrps(struct kvm *kvm)
+{
+	if (!kvm_is_realm(kvm))
+		return get_num_wrps();
+	/* Realm guest is not debuggable. */
+	return 0;
+}
+
 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
 {
 	return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
@@ -347,7 +363,6 @@  int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
 	case KVM_CAP_ARM_NISV_TO_USER:
 	case KVM_CAP_ARM_INJECT_EXT_DABT:
-	case KVM_CAP_SET_GUEST_DEBUG:
 	case KVM_CAP_VCPU_ATTRIBUTES:
 	case KVM_CAP_PTP_KVM:
 	case KVM_CAP_ARM_SYSTEM_SUSPEND:
@@ -355,6 +370,9 @@  int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_COUNTER_OFFSET:
 		r = 1;
 		break;
+	case KVM_CAP_SET_GUEST_DEBUG:
+		r = !kvm_is_realm(kvm);
+		break;
 	case KVM_CAP_SET_GUEST_DEBUG2:
 		return KVM_GUESTDBG_VALID_MASK;
 	case KVM_CAP_ARM_SET_DEVICE_ADDR:
@@ -400,10 +418,10 @@  int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 		r = cpus_have_final_cap(ARM64_HAS_32BIT_EL1);
 		break;
 	case KVM_CAP_GUEST_DEBUG_HW_BPS:
-		r = get_num_brps();
+		r = kvm_arm_get_num_brps(kvm);
 		break;
 	case KVM_CAP_GUEST_DEBUG_HW_WPS:
-		r = get_num_wrps();
+		r = kvm_arm_get_num_wrps(kvm);
 		break;
 	case KVM_CAP_ARM_PMU_V3:
 		r = kvm_arm_support_pmu_v3();