[PATCH v2 10/43] kvm: arm64: Expose debug HW register numbers for Realm

Steven Price
2024-04-12T08:43:42Z

From: Suzuki K Poulose <suzuki.poulose@arm.com>

Expose VM specific Debug HW register numbers.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
arch/arm64/kvm/arm.c | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 5729ea430d6d..22da6493912a 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -67,6 +67,22 @@ bool is_kvm_arm_initialised(void)
return kvm_arm_initialised;
}

+static u32 kvm_arm_get_num_brps(struct kvm *kvm)
+{
+ if (!kvm || !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 || !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;
@@ -257,7 +273,6 @@ 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:
@@ -265,6 +280,9 @@ 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:
@@ -310,10 +328,10 @@ 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();
--
2.34.1