Let userspace check if there is kvm ptp service in host.
before VMs migrate to a another host, VMM may check if this
cap is available to determine the migration behaviour.
Signed-off-by: Jianyong Wu <jianyong.wu@xxxxxxx>
Suggested-by: Marc Zyngier <maz@xxxxxxxxxx>
---
drivers/clocksource/arm_arch_timer.c | 4 ++--
drivers/ptp/ptp_kvm_arm64.c | 1 -
include/uapi/linux/kvm.h | 1 +
virt/kvm/arm/arm.c | 1 +
4 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index fe0ed8acfa33..0ae673193bee 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -1639,7 +1639,7 @@ TIMER_ACPI_DECLARE(arch_timer, ACPI_SIG_GTDT, arch_timer_acpi_init);
#if IS_ENABLED(CONFIG_PTP_1588_CLOCK_KVM)
#include <linux/arm-smccc.h>
-int kvm_arch_ptp_get_clock_fn(unsigned long *cycle, struct timespec64 *ts,
+int kvm_arch_ptp_get_crosststamp(unsigned long *cycle, struct timespec64 *ts,
struct clocksource **cs)
{
struct arm_smccc_res hvc_res;
@@ -1656,5 +1656,5 @@ int kvm_arch_ptp_get_clock_fn(unsigned long *cycle, struct timespec64 *ts,
return 0;
}
-EXPORT_SYMBOL_GPL(kvm_arch_ptp_get_clock_fn);
+EXPORT_SYMBOL_GPL(kvm_arch_ptp_get_crosststamp);
#endif
diff --git a/drivers/ptp/ptp_kvm_arm64.c b/drivers/ptp/ptp_kvm_arm64.c
index 7c697f20904f..f3f957117865 100644
--- a/drivers/ptp/ptp_kvm_arm64.c
+++ b/drivers/ptp/ptp_kvm_arm64.c
@@ -30,7 +30,6 @@ int kvm_arch_ptp_init(void)
int kvm_arch_ptp_get_clock_generic(struct timespec64 *ts,
struct arm_smccc_res *hvc_res)
{
- u64 ns;
ktime_t ktime_overall;
arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID,
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 2fe12b40d503..a0bff6002bd9 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -993,6 +993,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_ARM_SVE 170
#define KVM_CAP_ARM_PTRAUTH_ADDRESS 171
#define KVM_CAP_ARM_PTRAUTH_GENERIC 172
+#define KVM_CAP_ARM_KVM_PTP 173
#ifdef KVM_CAP_IRQ_ROUTING
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index bd5c55916d0d..80999985160b 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -201,6 +201,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_MP_STATE:
case KVM_CAP_IMMEDIATE_EXIT:
case KVM_CAP_VCPU_EVENTS:
+ case KVM_CAP_ARM_KVM_PTP:
r = 1;
break;
case KVM_CAP_ARM_SET_DEVICE_ADDR:
--
2.17.1
