From: Wei Huang Date: Fri, 19 Jun 2015 12:15:28 +0000 (+0200) Subject: KVM: x86/vPMU: whitespace and stylistic adjustments in PMU code X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=e84cfe4ce0113a6c5e3bdf70e20a21552ad3a28d;p=openwrt%2Fstaging%2Fblogic.git KVM: x86/vPMU: whitespace and stylistic adjustments in PMU code Signed-off-by: Wei Huang Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index 38819bc923cf..24d213bd42d4 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -103,25 +103,31 @@ static void kvm_perf_overflow(struct perf_event *perf_event, { struct kvm_pmc *pmc = perf_event->overflow_handler_context; struct kvm_pmu *pmu = pmc_to_pmu(pmc); - if (!test_and_set_bit(pmc->idx, (unsigned long *)&pmu->reprogram_pmi)) { + + if (!test_and_set_bit(pmc->idx, + (unsigned long *)&pmu->reprogram_pmi)) { __set_bit(pmc->idx, (unsigned long *)&pmu->global_status); kvm_make_request(KVM_REQ_PMU, pmc->vcpu); } } static void kvm_perf_overflow_intr(struct perf_event *perf_event, - struct perf_sample_data *data, struct pt_regs *regs) + struct perf_sample_data *data, + struct pt_regs *regs) { struct kvm_pmc *pmc = perf_event->overflow_handler_context; struct kvm_pmu *pmu = pmc_to_pmu(pmc); - if (!test_and_set_bit(pmc->idx, (unsigned long *)&pmu->reprogram_pmi)) { + + if (!test_and_set_bit(pmc->idx, + (unsigned long *)&pmu->reprogram_pmi)) { __set_bit(pmc->idx, (unsigned long *)&pmu->global_status); kvm_make_request(KVM_REQ_PMU, pmc->vcpu); + /* * Inject PMI. If vcpu was in a guest mode during NMI PMI * can be ejected on a guest mode re-entry. Otherwise we can't * be sure that vcpu wasn't executing hlt instruction at the - * time of vmexit and is not going to re-enter guest mode until, + * time of vmexit and is not going to re-enter guest mode until * woken up. So we should wake it, but this is impossible from * NMI context. Do it from irq work instead. */ @@ -157,8 +163,9 @@ static void pmc_stop_counter(struct kvm_pmc *pmc) } static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type, - unsigned config, bool exclude_user, bool exclude_kernel, - bool intr, bool in_tx, bool in_tx_cp) + unsigned config, bool exclude_user, + bool exclude_kernel, bool intr, + bool in_tx, bool in_tx_cp) { struct perf_event *event; struct perf_event_attr attr = { @@ -171,6 +178,7 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type, .exclude_kernel = exclude_kernel, .config = config, }; + if (in_tx) attr.config |= HSW_IN_TX; if (in_tx_cp) @@ -182,8 +190,8 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type, intr ? kvm_perf_overflow_intr : kvm_perf_overflow, pmc); if (IS_ERR(event)) { - printk_once("kvm: pmu event creation failed %ld\n", - PTR_ERR(event)); + printk_once("kvm_pmu: event creation failed %ld\n", + PTR_ERR(event)); return; } @@ -227,10 +235,10 @@ static void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel) unit_mask = (eventsel & ARCH_PERFMON_EVENTSEL_UMASK) >> 8; if (!(eventsel & (ARCH_PERFMON_EVENTSEL_EDGE | - ARCH_PERFMON_EVENTSEL_INV | - ARCH_PERFMON_EVENTSEL_CMASK | - HSW_IN_TX | - HSW_IN_TX_CHECKPOINTED))) { + ARCH_PERFMON_EVENTSEL_INV | + ARCH_PERFMON_EVENTSEL_CMASK | + HSW_IN_TX | + HSW_IN_TX_CHECKPOINTED))) { config = find_arch_event(pmc_to_pmu(pmc), event_select, unit_mask); if (config != PERF_COUNT_HW_MAX) @@ -241,28 +249,28 @@ static void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel) config = eventsel & X86_RAW_EVENT_MASK; pmc_reprogram_counter(pmc, type, config, - !(eventsel & ARCH_PERFMON_EVENTSEL_USR), - !(eventsel & ARCH_PERFMON_EVENTSEL_OS), - eventsel & ARCH_PERFMON_EVENTSEL_INT, - (eventsel & HSW_IN_TX), - (eventsel & HSW_IN_TX_CHECKPOINTED)); + !(eventsel & ARCH_PERFMON_EVENTSEL_USR), + !(eventsel & ARCH_PERFMON_EVENTSEL_OS), + eventsel & ARCH_PERFMON_EVENTSEL_INT, + (eventsel & HSW_IN_TX), + (eventsel & HSW_IN_TX_CHECKPOINTED)); } -static void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 en_pmi, int idx) +static void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int idx) { - unsigned en = en_pmi & 0x3; - bool pmi = en_pmi & 0x8; + unsigned en_field = ctrl & 0x3; + bool pmi = ctrl & 0x8; pmc_stop_counter(pmc); - if (!en || !pmc_is_enabled(pmc)) + if (!en_field || !pmc_is_enabled(pmc)) return; pmc_reprogram_counter(pmc, PERF_TYPE_HARDWARE, - arch_events[fixed_pmc_events[idx]].event_type, - !(en & 0x2), /* exclude user */ - !(en & 0x1), /* exclude kernel */ - pmi, false, false); + arch_events[fixed_pmc_events[idx]].event_type, + !(en_field & 0x2), /* exclude user */ + !(en_field & 0x1), /* exclude kernel */ + pmi, false, false); } static inline u8 fixed_ctrl_field(u64 ctrl, int idx) @@ -275,21 +283,22 @@ static void reprogram_fixed_counters(struct kvm_pmu *pmu, u64 data) int i; for (i = 0; i < pmu->nr_arch_fixed_counters; i++) { - u8 en_pmi = fixed_ctrl_field(data, i); + u8 old_ctrl = fixed_ctrl_field(pmu->fixed_ctr_ctrl, i); + u8 new_ctrl = fixed_ctrl_field(data, i); struct kvm_pmc *pmc = get_fixed_pmc_idx(pmu, i); - if (fixed_ctrl_field(pmu->fixed_ctr_ctrl, i) == en_pmi) + if (old_ctrl == new_ctrl) continue; - reprogram_fixed_counter(pmc, en_pmi, i); + reprogram_fixed_counter(pmc, new_ctrl, i); } pmu->fixed_ctr_ctrl = data; } -static void reprogram_counter(struct kvm_pmu *pmu, int idx) +static void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx) { - struct kvm_pmc *pmc = global_idx_to_pmc(pmu, idx); + struct kvm_pmc *pmc = global_idx_to_pmc(pmu, pmc_idx); if (!pmc) return; @@ -297,9 +306,10 @@ static void reprogram_counter(struct kvm_pmu *pmu, int idx) if (pmc_is_gp(pmc)) reprogram_gp_counter(pmc, pmc->eventsel); else { - int fidx = idx - INTEL_PMC_IDX_FIXED; - reprogram_fixed_counter(pmc, - fixed_ctrl_field(pmu->fixed_ctr_ctrl, fidx), fidx); + int idx = pmc_idx - INTEL_PMC_IDX_FIXED; + u8 ctrl = fixed_ctrl_field(pmu->fixed_ctr_ctrl, idx); + + reprogram_fixed_counter(pmc, ctrl, idx); } } @@ -423,37 +433,43 @@ int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) return 1; } -int kvm_pmu_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned pmc) +/* check if idx is a valid index to access PMU */ +int kvm_pmu_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned idx) { struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); - bool fixed = pmc & (1u << 30); - pmc &= ~(3u << 30); - return (!fixed && pmc >= pmu->nr_arch_gp_counters) || - (fixed && pmc >= pmu->nr_arch_fixed_counters); + bool fixed = idx & (1u << 30); + idx &= ~(3u << 30); + return (!fixed && idx >= pmu->nr_arch_gp_counters) || + (fixed && idx >= pmu->nr_arch_fixed_counters); } -int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data) +int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data) { struct kvm_pmu *pmu = vcpu_to_pmu(vcpu); - bool fast_mode = pmc & (1u << 31); - bool fixed = pmc & (1u << 30); + bool fast_mode = idx & (1u << 31); + bool fixed = idx & (1u << 30); struct kvm_pmc *counters; - u64 ctr; + u64 ctr_val; - pmc &= ~(3u << 30); - if (!fixed && pmc >= pmu->nr_arch_gp_counters) + idx &= ~(3u << 30); + if (!fixed && idx >= pmu->nr_arch_gp_counters) return 1; - if (fixed && pmc >= pmu->nr_arch_fixed_counters) + if (fixed && idx >= pmu->nr_arch_fixed_counters) return 1; counters = fixed ? pmu->fixed_counters : pmu->gp_counters; - ctr = pmc_read_counter(&counters[pmc]); + + ctr_val = pmc_read_counter(&counters[idx]); if (fast_mode) - ctr = (u32)ctr; - *data = ctr; + ctr_val = (u32)ctr_val; + *data = ctr_val; return 0; } +/* refresh PMU settings. This function generally is called when underlying + * settings are changed (such as changes of PMU CPUID by guest VMs), which + * should rarely happen. + */ void kvm_pmu_refresh(struct kvm_vcpu *vcpu) { struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);