| Message ID | 1454656456-11640-20-git-send-email-zhaoshenglong@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Feb 05, 2016 at 03:14:14PM +0800, Shannon Zhao wrote: > From: Shannon Zhao <shannon.zhao@linaro.org> > > To support guest PMUv3, use one bit of the VCPU INIT feature array. > Initialize the PMU when initialzing the vcpu with that bit and PMU > overflow interrupt set. > > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> > Acked-by: Peter Maydell <peter.maydell@linaro.org> > Reviewed-by: Andrew Jones <drjones@redhat.com> > --- > CC: Peter Maydell <peter.maydell@linaro.org> > --- > Documentation/virtual/kvm/api.txt | 2 ++ > arch/arm64/include/asm/kvm_host.h | 2 +- > arch/arm64/include/uapi/asm/kvm.h | 1 + > arch/arm64/kvm/reset.c | 3 +++ > include/kvm/arm_pmu.h | 2 ++ > include/uapi/linux/kvm.h | 1 + > virt/kvm/arm/pmu.c | 9 +++++++++ > 7 files changed, 19 insertions(+), 1 deletion(-) > > diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt > index 07e4cdf..9684f8d 100644 > --- a/Documentation/virtual/kvm/api.txt > +++ b/Documentation/virtual/kvm/api.txt > @@ -2577,6 +2577,8 @@ Possible features: > Depends on KVM_CAP_ARM_EL1_32BIT (arm64 only). > - KVM_ARM_VCPU_PSCI_0_2: Emulate PSCI v0.2 for the CPU. > Depends on KVM_CAP_ARM_PSCI_0_2. > + - KVM_ARM_VCPU_PMU_V3: Emulate PMUv3 for the CPU. > + Depends on KVM_CAP_ARM_PMU_V3. > > > 4.83 KVM_ARM_PREFERRED_TARGET > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h > index 6bab7fb..cb220b7 100644 > --- a/arch/arm64/include/asm/kvm_host.h > +++ b/arch/arm64/include/asm/kvm_host.h > @@ -40,7 +40,7 @@ > > #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS > > -#define KVM_VCPU_MAX_FEATURES 3 > +#define KVM_VCPU_MAX_FEATURES 4 > > int __attribute_const__ kvm_target_cpu(void); > int kvm_reset_vcpu(struct kvm_vcpu *vcpu); > diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h > index 2d4ca4b..6aedbe3 100644 > --- a/arch/arm64/include/uapi/asm/kvm.h > +++ b/arch/arm64/include/uapi/asm/kvm.h > @@ -94,6 +94,7 @@ struct kvm_regs { > #define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */ > #define KVM_ARM_VCPU_EL1_32BIT 1 /* CPU running a 32bit VM */ > #define KVM_ARM_VCPU_PSCI_0_2 2 /* CPU uses PSCI v0.2 */ > +#define KVM_ARM_VCPU_PMU_V3 3 /* Support guest PMUv3 */ > > struct kvm_vcpu_init { > __u32 target; > diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c > index dfbce78..cf4f28a 100644 > --- a/arch/arm64/kvm/reset.c > +++ b/arch/arm64/kvm/reset.c > @@ -77,6 +77,9 @@ int kvm_arch_dev_ioctl_check_extension(long ext) > case KVM_CAP_GUEST_DEBUG_HW_WPS: > r = get_num_wrps(); > break; > + case KVM_CAP_ARM_PMU_V3: > + r = kvm_arm_support_pmu_v3(); > + break; > case KVM_CAP_SET_GUEST_DEBUG: > r = 1; > break; > diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h > index d73cb97..5f86e1d 100644 > --- a/include/kvm/arm_pmu.h > +++ b/include/kvm/arm_pmu.h > @@ -51,6 +51,7 @@ void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val); > void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val); > void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data, > u64 select_idx); > +bool kvm_arm_support_pmu_v3(void); > #else > struct kvm_pmu { > }; > @@ -77,6 +78,7 @@ static inline void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val) {} > static inline void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val) {} > static inline void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, > u64 data, u64 select_idx) {} > +static inline bool kvm_arm_support_pmu_v3(void) { return false; } > #endif > > #endif > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index 9da9051..dc16d30 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -850,6 +850,7 @@ struct kvm_ppc_smmu_info { > #define KVM_CAP_IOEVENTFD_ANY_LENGTH 122 > #define KVM_CAP_HYPERV_SYNIC 123 > #define KVM_CAP_S390_RI 124 > +#define KVM_CAP_ARM_PMU_V3 125 > > #ifdef KVM_CAP_IRQ_ROUTING > > diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c > index 6b525df..2467d62 100644 > --- a/virt/kvm/arm/pmu.c > +++ b/virt/kvm/arm/pmu.c > @@ -384,3 +384,12 @@ void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data, > > pmc->perf_event = event; > } > + > +bool kvm_arm_support_pmu_v3(void) > +{ > + /* Check if HW_PERF_EVENTS are supported by checking the number of > + * hardware performance counters. This could ensure physical PMU and > + * PERF_EVENT driver existing. > + */ nit: coding style, opening comment block should be on its own line I don't understand the last sentence. Do you mean: "This ensures the presence of a physical PMU and that CONFIG_PERF_EVENT is selected." ? Thanks, -Christoffer
On 2016/2/8 20:29, Christoffer Dall wrote: >> +bool kvm_arm_support_pmu_v3(void) >> > +{ >> > + /* Check if HW_PERF_EVENTS are supported by checking the number of >> > + * hardware performance counters. This could ensure physical PMU and >> > + * PERF_EVENT driver existing. >> > + */ > nit: coding style, opening comment block should be on its own line > > I don't understand the last sentence. Do you mean: "This ensures the > presence of a physical PMU and that CONFIG_PERF_EVENT is selected." ? Right.
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 07e4cdf..9684f8d 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2577,6 +2577,8 @@ Possible features: Depends on KVM_CAP_ARM_EL1_32BIT (arm64 only). - KVM_ARM_VCPU_PSCI_0_2: Emulate PSCI v0.2 for the CPU. Depends on KVM_CAP_ARM_PSCI_0_2. + - KVM_ARM_VCPU_PMU_V3: Emulate PMUv3 for the CPU. + Depends on KVM_CAP_ARM_PMU_V3. 4.83 KVM_ARM_PREFERRED_TARGET diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 6bab7fb..cb220b7 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -40,7 +40,7 @@ #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS -#define KVM_VCPU_MAX_FEATURES 3 +#define KVM_VCPU_MAX_FEATURES 4 int __attribute_const__ kvm_target_cpu(void); int kvm_reset_vcpu(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 2d4ca4b..6aedbe3 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -94,6 +94,7 @@ struct kvm_regs { #define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */ #define KVM_ARM_VCPU_EL1_32BIT 1 /* CPU running a 32bit VM */ #define KVM_ARM_VCPU_PSCI_0_2 2 /* CPU uses PSCI v0.2 */ +#define KVM_ARM_VCPU_PMU_V3 3 /* Support guest PMUv3 */ struct kvm_vcpu_init { __u32 target; diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index dfbce78..cf4f28a 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -77,6 +77,9 @@ int kvm_arch_dev_ioctl_check_extension(long ext) case KVM_CAP_GUEST_DEBUG_HW_WPS: r = get_num_wrps(); break; + case KVM_CAP_ARM_PMU_V3: + r = kvm_arm_support_pmu_v3(); + break; case KVM_CAP_SET_GUEST_DEBUG: r = 1; break; diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h index d73cb97..5f86e1d 100644 --- a/include/kvm/arm_pmu.h +++ b/include/kvm/arm_pmu.h @@ -51,6 +51,7 @@ void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val); void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val); void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data, u64 select_idx); +bool kvm_arm_support_pmu_v3(void); #else struct kvm_pmu { }; @@ -77,6 +78,7 @@ static inline void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val) {} static inline void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val) {} static inline void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data, u64 select_idx) {} +static inline bool kvm_arm_support_pmu_v3(void) { return false; } #endif #endif diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 9da9051..dc16d30 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -850,6 +850,7 @@ struct kvm_ppc_smmu_info { #define KVM_CAP_IOEVENTFD_ANY_LENGTH 122 #define KVM_CAP_HYPERV_SYNIC 123 #define KVM_CAP_S390_RI 124 +#define KVM_CAP_ARM_PMU_V3 125 #ifdef KVM_CAP_IRQ_ROUTING diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c index 6b525df..2467d62 100644 --- a/virt/kvm/arm/pmu.c +++ b/virt/kvm/arm/pmu.c @@ -384,3 +384,12 @@ void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data, pmc->perf_event = event; } + +bool kvm_arm_support_pmu_v3(void) +{ + /* Check if HW_PERF_EVENTS are supported by checking the number of + * hardware performance counters. This could ensure physical PMU and + * PERF_EVENT driver existing. + */ + return (perf_num_counters() > 0); +}