diff options
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 3 | ||||
| -rw-r--r-- | arch/arm64/kvm/pmu-emul.c | 21 | ||||
| -rw-r--r-- | arch/arm64/kvm/sys_regs.c | 28 | ||||
| -rw-r--r-- | include/kvm/arm_pmu.h | 6 |
4 files changed, 43 insertions, 15 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index af06ccb7ee34..0fe9cc9dc836 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -257,6 +257,9 @@ struct kvm_arch { cpumask_var_t supported_cpus; + /* PMCR_EL0.N value for the guest */ + u8 pmcr_n; + /* Hypercall features firmware registers' descriptor */ struct kvm_smccc_features smccc_feat; struct maple_tree smccc_filter; diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index 6337ba6f7941..6d4763d7308f 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -873,11 +873,27 @@ static bool pmu_irq_is_valid(struct kvm *kvm, int irq) return true; } +/** + * kvm_arm_pmu_get_max_counters - Return the max number of PMU counters. + * @kvm: The kvm pointer + */ +u8 kvm_arm_pmu_get_max_counters(struct kvm *kvm) +{ + struct arm_pmu *arm_pmu = kvm->arch.arm_pmu; + + /* + * The arm_pmu->num_events considers the cycle counter as well. + * Ignore that and return only the general-purpose counters. + */ + return arm_pmu->num_events - 1; +} + static void kvm_arm_set_pmu(struct kvm *kvm, struct arm_pmu *arm_pmu) { lockdep_assert_held(&kvm->arch.config_lock); kvm->arch.arm_pmu = arm_pmu; + kvm->arch.pmcr_n = kvm_arm_pmu_get_max_counters(kvm); } /** @@ -1091,5 +1107,8 @@ u8 kvm_arm_pmu_get_pmuver_limit(void) */ u64 kvm_vcpu_read_pmcr(struct kvm_vcpu *vcpu) { - return __vcpu_sys_reg(vcpu, PMCR_EL0); + u64 pmcr = __vcpu_sys_reg(vcpu, PMCR_EL0) & + ~(ARMV8_PMU_PMCR_N_MASK << ARMV8_PMU_PMCR_N_SHIFT); + + return pmcr | ((u64)vcpu->kvm->arch.pmcr_n << ARMV8_PMU_PMCR_N_SHIFT); } diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index d490cd903e2b..6dcfac15fe49 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -721,12 +721,7 @@ static u64 reset_pmu_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) { u64 n, mask = BIT(ARMV8_PMU_CYCLE_IDX); - /* No PMU available, any PMU reg may UNDEF... */ - if (!kvm_arm_support_pmu_v3()) - return 0; - - n = read_sysreg(pmcr_el0) >> ARMV8_PMU_PMCR_N_SHIFT; - n &= ARMV8_PMU_PMCR_N_MASK; + n = vcpu->kvm->arch.pmcr_n; if (n) mask |= GENMASK(n - 1, 0); @@ -762,17 +757,15 @@ static u64 reset_pmselr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) static u64 reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) { - u64 pmcr; + u64 pmcr = 0; - /* No PMU available, PMCR_EL0 may UNDEF... */ - if (!kvm_arm_support_pmu_v3()) - return 0; - - /* Only preserve PMCR_EL0.N, and reset the rest to 0 */ - pmcr = read_sysreg(pmcr_el0) & (ARMV8_PMU_PMCR_N_MASK << ARMV8_PMU_PMCR_N_SHIFT); if (!kvm_supports_32bit_el0()) pmcr |= ARMV8_PMU_PMCR_LC; + /* + * The value of PMCR.N field is included when the + * vCPU register is read via kvm_vcpu_read_pmcr(). + */ __vcpu_sys_reg(vcpu, r->reg) = pmcr; return __vcpu_sys_reg(vcpu, r->reg); @@ -1103,6 +1096,13 @@ static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, return true; } +static int get_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r, + u64 *val) +{ + *val = kvm_vcpu_read_pmcr(vcpu); + return 0; +} + /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */ #define DBG_BCR_BVR_WCR_WVR_EL1(n) \ { SYS_DESC(SYS_DBGBVRn_EL1(n)), \ @@ -2167,7 +2167,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { { SYS_DESC(SYS_SVCR), undef_access }, { PMU_SYS_REG(PMCR_EL0), .access = access_pmcr, - .reset = reset_pmcr, .reg = PMCR_EL0 }, + .reset = reset_pmcr, .reg = PMCR_EL0, .get_user = get_pmcr }, { PMU_SYS_REG(PMCNTENSET_EL0), .access = access_pmcnten, .reg = PMCNTENSET_EL0 }, { PMU_SYS_REG(PMCNTENCLR_EL0), diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h index c6a5e49b850a..96e15f4bb18c 100644 --- a/include/kvm/arm_pmu.h +++ b/include/kvm/arm_pmu.h @@ -102,6 +102,7 @@ void kvm_vcpu_pmu_resync_el0(void); u8 kvm_arm_pmu_get_pmuver_limit(void); int kvm_arm_set_default_pmu(struct kvm *kvm); +u8 kvm_arm_pmu_get_max_counters(struct kvm *kvm); u64 kvm_vcpu_read_pmcr(struct kvm_vcpu *vcpu); #else @@ -181,6 +182,11 @@ static inline int kvm_arm_set_default_pmu(struct kvm *kvm) return -ENODEV; } +static inline u8 kvm_arm_pmu_get_max_counters(struct kvm *kvm) +{ + return 0; +} + static inline u64 kvm_vcpu_read_pmcr(struct kvm_vcpu *vcpu) { return 0; |