[PATCH 2/9] KVM: Expose a version 2 architectural PMU to a guests

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From: Avi Kivity <avi@xxxxxxxxxx>

Use perf_events to emulate an architectural PMU, version 2.

Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
---
 arch/x86/include/asm/kvm_host.h |   43 ++++
 arch/x86/kvm/Makefile           |    2 +-
 arch/x86/kvm/pmu.c              |  513 +++++++++++++++++++++++++++++++++++++++
 arch/x86/kvm/x86.c              |   20 +-
 include/linux/kvm_host.h        |    1 +
 5 files changed, 570 insertions(+), 9 deletions(-)
 create mode 100644 arch/x86/kvm/pmu.c

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index c1f19de..53caa94 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -20,6 +20,7 @@
 #include <linux/kvm.h>
 #include <linux/kvm_para.h>
 #include <linux/kvm_types.h>
+#include <linux/perf_event.h>
 
 #include <asm/pvclock-abi.h>
 #include <asm/desc.h>
@@ -296,6 +297,36 @@ struct kvm_mmu {
 	u64 pdptrs[4]; /* pae */
 };
 
+enum pmc_type {
+	KVM_PMC_GP,
+	KVM_PMC_FIXED,
+};
+
+struct kvm_pmc {
+	enum pmc_type type;
+	u64 counter;
+	u64 eventsel;
+	struct perf_event *perf_event;
+	struct kvm_vcpu *vcpu;
+};
+
+struct kvm_pmu {
+	unsigned nr_arch_gp_counters;
+	unsigned nr_arch_fixed_counters;
+	unsigned available_event_types;
+	u64 fixed_ctr_ctrl;
+	u64 global_ctrl;
+	u64 global_status;
+	u64 global_ovf_ctrl;
+	u64 gp_counter_bitmask;
+	u64 fixed_counter_bitmask;
+	u64 global_ctrl_mask;
+	u8 version;
+	struct kvm_pmc gp_counters[X86_PMC_MAX_GENERIC];
+	struct kvm_pmc fixed_counters[X86_PMC_MAX_FIXED];
+	u64 reprogram_pmi;
+};
+
 struct kvm_vcpu_arch {
 	/*
 	 * rip and regs accesses must go through
@@ -433,6 +464,8 @@ struct kvm_vcpu_arch {
 	unsigned access;
 	gfn_t mmio_gfn;
 
+	struct kvm_pmu pmu;
+
 	/* used for guest single stepping over the given code position */
 	unsigned long singlestep_rip;
 
@@ -894,4 +927,14 @@ extern bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn);
 
 void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err);
 
+void kvm_pmu_init(struct kvm_vcpu *vcpu);
+void kvm_pmu_destroy(struct kvm_vcpu *vcpu);
+void kvm_pmu_reset(struct kvm_vcpu *vcpu);
+void kvm_pmu_cpuid_update(struct kvm_vcpu *vcpu);
+bool kvm_pmu_msr(struct kvm_vcpu *vcpu, u32 msr);
+int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
+int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data);
+int kvm_pmu_read_pmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data);
+void kvm_handle_pmu_event(struct kvm_vcpu *vcpu);
+
 #endif /* _ASM_X86_KVM_HOST_H */
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index f15501f..cfca03f 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -12,7 +12,7 @@ kvm-$(CONFIG_IOMMU_API)	+= $(addprefix ../../../virt/kvm/, iommu.o)
 kvm-$(CONFIG_KVM_ASYNC_PF)	+= $(addprefix ../../../virt/kvm/, async_pf.o)
 
 kvm-y			+= x86.o mmu.o emulate.o i8259.o irq.o lapic.o \
-			   i8254.o timer.o
+			   i8254.o timer.o pmu.o
 kvm-intel-y		+= vmx.o
 kvm-amd-y		+= svm.o
 
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
new file mode 100644
index 0000000..66b64a7
--- /dev/null
+++ b/arch/x86/kvm/pmu.c
@@ -0,0 +1,513 @@
+/*
+ * Kernel-based Virtual Machine -- Performane Monitoring Unit support
+ *
+ * Copyright 2011 Red Hat, Inc. and/or its affiliates.
+ *
+ * Authors:
+ *   Avi Kivity   <avi@xxxxxxxxxx>
+ *   Gleb Natapov <gleb@xxxxxxxxxx>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/kvm_host.h>
+#include <linux/perf_event.h>
+#include "x86.h"
+#include "lapic.h"
+
+static struct kvm_arch_event_perf_mapping {
+	u8 eventsel;
+	u8 unit_mask;
+	unsigned event_type;
+	bool inexact;
+} arch_events[] = {
+	/* Index must match CPUID 0x0A.EBX bit vector */
+	[0] = { 0x3c, 0x00, PERF_COUNT_HW_CPU_CYCLES },
+	[1] = { 0xc0, 0x00, PERF_COUNT_HW_INSTRUCTIONS },
+	[2] = { 0x3c, 0x01, PERF_COUNT_HW_BUS_CYCLES  },
+	[3] = { 0x2e, 0x4f, PERF_COUNT_HW_CACHE_REFERENCES },
+	[4] = { 0x2e, 0x41, PERF_COUNT_HW_CACHE_MISSES },
+	[5] = { 0xc4, 0x00, PERF_COUNT_HW_BRANCH_INSTRUCTIONS },
+	[6] = { 0xc5, 0x00, PERF_COUNT_HW_BRANCH_MISSES },
+};
+
+/* mapping between fixed pmc index and arch_events array */
+int fixed_pmc_events[] = {1, 0, 2};
+
+static bool pmc_is_gp(struct kvm_pmc *pmc)
+{
+	return pmc->type == KVM_PMC_GP;
+}
+
+static inline u64 pmc_bitmask(struct kvm_pmc *pmc)
+{
+	struct kvm_pmu *pmu = &pmc->vcpu->arch.pmu;
+
+	return pmc_is_gp(pmc) ? pmu->gp_counter_bitmask :
+		pmu->fixed_counter_bitmask;
+}
+
+static inline int pmc_to_global_idx(struct kvm_pmc *pmc)
+{
+	struct kvm_pmu *pmu = &pmc->vcpu->arch.pmu;
+	struct kvm_pmc *counters;
+	int shift;
+
+	if (pmc_is_gp(pmc)) {
+		counters = pmu->gp_counters;
+		shift = X86_PMC_IDX_GENERIC;
+	} else {
+		counters = pmu->fixed_counters;
+		shift = X86_PMC_IDX_FIXED;
+	}
+
+	return pmc - counters + shift;
+}
+
+static inline bool pmc_enabled(struct kvm_pmc *pmc)
+{
+	struct kvm_pmu *pmu = &pmc->vcpu->arch.pmu;
+	return test_bit(pmc_to_global_idx(pmc),
+			(unsigned long *)&pmu->global_ctrl);
+}
+
+static inline struct kvm_pmc *get_gp_pmc(struct kvm_pmu *pmu, u32 msr,
+					 u32 base)
+{
+	if (msr >= base && msr < base + pmu->nr_arch_gp_counters)
+		return &pmu->gp_counters[msr - base];
+	return NULL;
+}
+
+static inline struct kvm_pmc *get_fixed_pmc(struct kvm_pmu *pmu, u32 msr)
+{
+	int base = MSR_CORE_PERF_FIXED_CTR0;
+	if (msr >= base && msr < base + pmu->nr_arch_fixed_counters)
+		return &pmu->fixed_counters[msr - base];
+	return NULL;
+}
+
+static struct kvm_pmc *global_idx_to_pmc(struct kvm_pmu *pmu, int idx)
+{
+	if (idx < X86_PMC_IDX_FIXED)
+		return get_gp_pmc(pmu, MSR_P6_EVNTSEL0 + idx, MSR_P6_EVNTSEL0);
+	else
+		return get_fixed_pmc(pmu, MSR_CORE_PERF_FIXED_CTR0 + idx -
+				X86_PMC_IDX_FIXED);
+}
+
+static void kvm_perf_overflow(struct perf_event *perf_event,
+			      struct perf_sample_data *data,
+			      struct pt_regs *regs)
+{
+	struct kvm_pmc *pmc = perf_event->overflow_handler_context;
+	struct kvm_pmu *pmu = &pmc->vcpu->arch.pmu;
+	__set_bit(pmc_to_global_idx(pmc),
+			(unsigned long *)&pmu->global_status);
+}
+
+static void kvm_perf_overflow_intr(struct perf_event *perf_event,
+		struct perf_sample_data *data, struct pt_regs *regs)
+{
+	struct kvm_pmc *pmc = perf_event->overflow_handler_context;
+	struct kvm_pmu *pmu = &pmc->vcpu->arch.pmu;
+	if (!__test_and_set_bit(pmc_to_global_idx(pmc),
+				(unsigned long *)&pmu->reprogram_pmi)) {
+		kvm_perf_overflow(perf_event, data, regs);
+		kvm_make_request(KVM_REQ_PMU, pmc->vcpu);
+	}
+}
+
+static u64 read_pmc(struct kvm_pmc *pmc)
+{
+	u64 counter, enabled, running;
+
+	counter = pmc->counter;
+
+	if (pmc->perf_event)
+		counter += perf_event_read_value(pmc->perf_event,
+						 &enabled, &running);
+
+	/* FIXME: Scaling needed? */
+
+	return counter & pmc_bitmask(pmc);
+}
+
+static void stop_counter(struct kvm_pmc *pmc)
+{
+	if (pmc->perf_event) {
+		pmc->counter = read_pmc(pmc);
+		perf_event_release_kernel(pmc->perf_event);
+		pmc->perf_event = NULL;
+	}
+}
+
+static void reprogram_counter(struct kvm_pmc *pmc, u32 type,
+		unsigned config, bool exclude_user, bool exclude_kernel,
+		bool intr)
+{
+	struct perf_event *event;
+	struct perf_event_attr attr = {
+		.type = type,
+		.size = sizeof(attr),
+		.exclude_idle = true,
+		.exclude_host = 1,
+		.exclude_user = exclude_user,
+		.exclude_kernel = exclude_kernel,
+		.sample_period = (-pmc->counter) & pmc_bitmask(pmc),
+		.config = config,
+	};
+
+	event = perf_event_create_kernel_counter(&attr, -1, current,
+						 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));
+		return;
+	}
+
+	pmc->perf_event = event;
+	__clear_bit(pmc_to_global_idx(pmc),
+			(unsigned long *)&pmc->vcpu->arch.pmu.reprogram_pmi);
+}
+
+static unsigned find_arch_event(struct kvm_pmu *pmu, u8 event_select,
+		u8 unit_mask)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(arch_events); i++)
+		if (arch_events[i].eventsel == event_select
+				&& arch_events[i].unit_mask == unit_mask
+				&& (pmu->available_event_types & (1 << i)))
+			break;
+
+	if (i == ARRAY_SIZE(arch_events))
+		return PERF_COUNT_HW_MAX;
+
+	return arch_events[i].event_type;
+}
+
+static void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
+{
+	unsigned config, type = PERF_TYPE_RAW;
+	u8 event_select, unit_mask;
+
+	pmc->eventsel = eventsel;
+
+	stop_counter(pmc);
+
+	if (!(eventsel & ARCH_PERFMON_EVENTSEL_ENABLE) || !pmc_enabled(pmc))
+		return;
+
+	event_select = eventsel & ARCH_PERFMON_EVENTSEL_EVENT;
+	unit_mask = (eventsel & ARCH_PERFMON_EVENTSEL_UMASK) >> 8;
+
+	if (!(event_select & (ARCH_PERFMON_EVENTSEL_EDGE |
+				ARCH_PERFMON_EVENTSEL_INV |
+				ARCH_PERFMON_EVENTSEL_CMASK))) {
+		config = find_arch_event(&pmc->vcpu->arch.pmu, event_select,
+				unit_mask);
+		if (config != PERF_COUNT_HW_MAX)
+			type = PERF_TYPE_HARDWARE;
+	}
+
+	if (type == PERF_TYPE_RAW)
+		config = eventsel & X86_RAW_EVENT_MASK;
+
+	reprogram_counter(pmc, type, config,
+			!(eventsel & ARCH_PERFMON_EVENTSEL_USR),
+			!(eventsel & ARCH_PERFMON_EVENTSEL_OS),
+			eventsel & ARCH_PERFMON_EVENTSEL_INT);
+}
+
+static void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 en_pmi, int idx)
+{
+	unsigned en = en_pmi & 0x3;
+	bool pmi = en_pmi & 0x8;
+
+	stop_counter(pmc);
+
+	if (!en || !pmc_enabled(pmc))
+		return;
+
+	reprogram_counter(pmc, PERF_TYPE_HARDWARE,
+			arch_events[fixed_pmc_events[idx]].event_type,
+			!(en & 0x2), /* exclude user */
+			!(en & 0x1), /* exclude kernel */
+			pmi);
+}
+
+#define FIXED_EN_PMI(R, I) (((R) >> ((I) * 4)) & 0xf)
+
+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_EN_PMI(data, i);
+		struct kvm_pmc *pmc = get_fixed_pmc(pmu,
+				MSR_CORE_PERF_FIXED_CTR0 + i);
+
+		if (FIXED_EN_PMI(pmu->fixed_ctr_ctrl, i) == en_pmi)
+			continue;
+
+		reprogram_fixed_counter(pmc, en_pmi, i);
+	}
+
+	pmu->fixed_ctr_ctrl = data;
+}
+
+static void reprogram_idx(struct kvm_pmu *pmu, int idx)
+{
+	struct kvm_pmc *pmc = global_idx_to_pmc(pmu, idx);
+
+	if (!pmc)
+		return;
+
+	if (pmc_is_gp(pmc))
+		reprogram_gp_counter(pmc, pmc->eventsel);
+	else {
+		int fidx = idx - X86_PMC_IDX_FIXED;
+		reprogram_fixed_counter(pmc,
+				FIXED_EN_PMI(pmu->fixed_ctr_ctrl, fidx), fidx);
+	}
+}
+
+static void global_ctrl_changed(struct kvm_pmu *pmu, u64 data)
+{
+	int bit;
+	u64 diff = pmu->global_ctrl ^ data;
+
+	pmu->global_ctrl = data;
+
+	for_each_set_bit(bit, (unsigned long *)&diff, X86_PMC_IDX_MAX)
+		reprogram_idx(pmu, bit);
+}
+
+bool kvm_pmu_msr(struct kvm_vcpu *vcpu, u32 msr)
+{
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	int ret;
+
+	switch (msr) {
+	case MSR_CORE_PERF_FIXED_CTR_CTRL:
+	case MSR_CORE_PERF_GLOBAL_STATUS:
+	case MSR_CORE_PERF_GLOBAL_CTRL:
+	case MSR_CORE_PERF_GLOBAL_OVF_CTRL:
+		ret = pmu->version > 1;
+		break;
+	default:
+		ret = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0)
+			|| get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0)
+			|| get_fixed_pmc(pmu, msr);
+		break;
+	}
+	return ret;
+}
+
+int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data)
+{
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	struct kvm_pmc *pmc;
+
+	switch (index) {
+	case MSR_CORE_PERF_FIXED_CTR_CTRL:
+		*data = pmu->fixed_ctr_ctrl;
+		return 0;
+	case MSR_CORE_PERF_GLOBAL_STATUS:
+		*data = pmu->global_status;
+		return 0;
+	case MSR_CORE_PERF_GLOBAL_CTRL:
+		*data = pmu->global_ctrl;
+		return 0;
+	case MSR_CORE_PERF_GLOBAL_OVF_CTRL:
+		*data = pmu->global_ovf_ctrl;
+		return 0;
+	default:
+		if ((pmc = get_gp_pmc(pmu, index, MSR_IA32_PERFCTR0)) ||
+				(pmc = get_fixed_pmc(pmu, index))) {
+			*data = read_pmc(pmc);
+			return 0;
+		} else if ((pmc = get_gp_pmc(pmu, index, MSR_P6_EVNTSEL0))) {
+			*data = pmc->eventsel;
+			return 0;
+		}
+	}
+	return 1;
+}
+
+int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data)
+{
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	struct kvm_pmc *pmc;
+
+	switch (index) {
+	case MSR_CORE_PERF_FIXED_CTR_CTRL:
+		if (pmu->fixed_ctr_ctrl == data)
+			return 0;
+		if (!(data & 0xfffffffffffff444)) {
+			reprogram_fixed_counters(pmu, data);
+			return 0;
+		}
+		break;
+	case MSR_CORE_PERF_GLOBAL_STATUS:
+		break; /* RO MSR */
+	case MSR_CORE_PERF_GLOBAL_CTRL:
+		if (pmu->global_ctrl == data)
+			return 0;
+		if (!(data & pmu->global_ctrl_mask)) {
+			global_ctrl_changed(pmu, data);
+			return 0;
+		}
+		break;
+	case MSR_CORE_PERF_GLOBAL_OVF_CTRL:
+		if (!(data & (pmu->global_ctrl_mask & ~(3ull<<62)))) {
+			pmu->global_status &= ~data;
+			pmu->global_ovf_ctrl = data;
+			return 0;
+		}
+		break;
+	default:
+		if ((pmc = get_gp_pmc(pmu, index, MSR_IA32_PERFCTR0)) ||
+				(pmc = get_fixed_pmc(pmu, index))) {
+			data = (s64)(s32)data;
+			pmc->counter += data - read_pmc(pmc);
+			return 0;
+		} else if ((pmc = get_gp_pmc(pmu, index, MSR_P6_EVNTSEL0))) {
+			if (data == pmc->eventsel)
+				return 0;
+			if (!(data & 0xffffffff00200000ull)) {
+				reprogram_gp_counter(pmc, data);
+				return 0;
+			}
+		}
+	}
+	return 1;
+}
+
+int kvm_pmu_read_pmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data)
+{
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	bool fast_mode = pmc & (1u << 31);
+	bool fixed = pmc & (1u << 30);
+	struct kvm_pmc *counters;
+	u64 ctr;
+
+	pmc &= (3u << 30) - 1;
+	if (!fixed && pmc >= pmu->nr_arch_gp_counters)
+		return 1;
+	if (fixed && pmc >= pmu->nr_arch_fixed_counters)
+		return 1;
+	counters = fixed ? pmu->fixed_counters : pmu->gp_counters;
+	ctr = read_pmc(&counters[pmc]);
+	if (fast_mode)
+		ctr = (u32)ctr;
+	*data = ctr;
+
+	return 0;
+}
+
+void kvm_pmu_cpuid_update(struct kvm_vcpu *vcpu)
+{
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	struct kvm_cpuid_entry2 *entry;
+	unsigned bitmap_len;
+
+	pmu->nr_arch_gp_counters = 0;
+	pmu->nr_arch_fixed_counters = 0;
+	pmu->fixed_counter_bitmask = 0;
+	pmu->version = 0;
+
+	entry = kvm_find_cpuid_entry(vcpu, 0xa, 0);
+	if (!entry)
+		return;
+
+	pmu->version = entry->eax & 0xff;
+	if (!pmu->version)
+		return;
+
+	pmu->nr_arch_gp_counters = min((int)(entry->eax >> 8) & 0xff,
+			X86_PMC_MAX_GENERIC);
+	pmu->gp_counter_bitmask = ((u64)1 << ((entry->eax >> 16) & 0xff)) - 1;
+	bitmap_len = (entry->eax >> 24) & 0xff;
+	pmu->available_event_types = ~entry->ebx & ((1ull << bitmap_len) - 1);
+
+	if (pmu->version > 1) {
+		pmu->nr_arch_fixed_counters = min((int)(entry->edx) & 0x1f,
+				X86_PMC_MAX_FIXED);
+		pmu->fixed_counter_bitmask =
+			((u64)1 << ((entry->edx >> 5) & 0xff)) - 1;
+		pmu->global_ctrl_mask = ~(((1 << pmu->nr_arch_gp_counters) - 1)
+				| (((1ull << pmu->nr_arch_fixed_counters) - 1)
+					<< X86_PMC_IDX_FIXED));
+	} else
+		pmu->global_ctrl = (1 << pmu->nr_arch_gp_counters) - 1;
+}
+
+void kvm_pmu_init(struct kvm_vcpu *vcpu)
+{
+	int i;
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+
+	memset(pmu, 0, sizeof(*pmu));
+	for (i = 0; i < X86_PMC_MAX_GENERIC; i++) {
+		pmu->gp_counters[i].type = KVM_PMC_GP;
+		pmu->gp_counters[i].vcpu = vcpu;
+	}
+	for (i = 0; i < X86_PMC_MAX_FIXED; i++) {
+		pmu->fixed_counters[i].type = KVM_PMC_FIXED;
+		pmu->fixed_counters[i].vcpu = vcpu;
+	}
+	kvm_pmu_cpuid_update(vcpu);
+}
+
+void kvm_pmu_reset(struct kvm_vcpu *vcpu)
+{
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	int i;
+
+	for (i = 0; i < X86_PMC_MAX_GENERIC; i++) {
+		struct kvm_pmc *pmc = &pmu->gp_counters[i];
+		stop_counter(pmc);
+		pmc->counter = pmc->eventsel = 0;
+	}
+
+	for (i = 0; i < X86_PMC_MAX_FIXED; i++)
+		stop_counter(&pmu->fixed_counters[i]);
+
+	pmu->fixed_ctr_ctrl = pmu->global_ctrl = pmu->global_status =
+		pmu->global_ovf_ctrl = 0;
+}
+
+void kvm_pmu_destroy(struct kvm_vcpu *vcpu)
+{
+	kvm_pmu_reset(vcpu);
+}
+
+void kvm_handle_pmu_event(struct kvm_vcpu *vcpu)
+{
+	struct kvm_pmu *pmu = &vcpu->arch.pmu;
+	u64 bitmask;
+	int bit;
+
+	if (vcpu->arch.apic)
+		kvm_apic_local_deliver(vcpu->arch.apic, APIC_LVTPC);
+
+	bitmask = pmu->reprogram_pmi;
+
+	for_each_set_bit(bit, (unsigned long *)&bitmask, X86_PMC_IDX_MAX) {
+		struct kvm_pmc *pmc = global_idx_to_pmc(pmu, bit);
+
+		if (unlikely(!pmc || !pmc->perf_event)) {
+			__clear_bit(bit, (unsigned long *)&pmu->reprogram_pmi);
+			continue;
+		}
+
+		reprogram_idx(pmu, bit);
+	}
+}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2b1c526..eb60363 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -623,6 +623,8 @@ static void update_cpuid(struct kvm_vcpu *vcpu)
 
 	if (apic)
 		apic->lapic_timer.timer_mode_mask = timer_mode_mask;
+
+	kvm_pmu_cpuid_update(vcpu);
 }
 
 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
@@ -1655,8 +1657,6 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 	 * which we perfectly emulate ;-). Any other value should be at least
 	 * reported, some guests depend on them.
 	 */
-	case MSR_P6_EVNTSEL0:
-	case MSR_P6_EVNTSEL1:
 	case MSR_K7_EVNTSEL0:
 	case MSR_K7_EVNTSEL1:
 	case MSR_K7_EVNTSEL2:
@@ -1668,8 +1668,6 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 	/* at least RHEL 4 unconditionally writes to the perfctr registers,
 	 * so we ignore writes to make it happy.
 	 */
-	case MSR_P6_PERFCTR0:
-	case MSR_P6_PERFCTR1:
 	case MSR_K7_PERFCTR0:
 	case MSR_K7_PERFCTR1:
 	case MSR_K7_PERFCTR2:
@@ -1706,6 +1704,8 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 	default:
 		if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr))
 			return xen_hvm_config(vcpu, data);
+		if (kvm_pmu_msr(vcpu, msr))
+			return kvm_pmu_set_msr(vcpu, msr, data);
 		if (!ignore_msrs) {
 			pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
 				msr, data);
@@ -1868,10 +1868,6 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 	case MSR_K8_SYSCFG:
 	case MSR_K7_HWCR:
 	case MSR_VM_HSAVE_PA:
-	case MSR_P6_PERFCTR0:
-	case MSR_P6_PERFCTR1:
-	case MSR_P6_EVNTSEL0:
-	case MSR_P6_EVNTSEL1:
 	case MSR_K7_EVNTSEL0:
 	case MSR_K7_PERFCTR0:
 	case MSR_K8_INT_PENDING_MSG:
@@ -1982,6 +1978,8 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 		data = 0xbe702111;
 		break;
 	default:
+		if (kvm_pmu_msr(vcpu, msr))
+			return kvm_pmu_get_msr(vcpu, msr, pdata);
 		if (!ignore_msrs) {
 			pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
 			return 1;
@@ -5730,6 +5728,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 			process_nmi(vcpu);
 		req_immediate_exit =
 			kvm_check_request(KVM_REQ_IMMEDIATE_EXIT, vcpu);
+		if (kvm_check_request(KVM_REQ_PMU, vcpu))
+			kvm_handle_pmu_event(vcpu);
 	}
 
 	r = kvm_mmu_reload(vcpu);
@@ -6470,6 +6470,8 @@ int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
 	kvm_async_pf_hash_reset(vcpu);
 	vcpu->arch.apf.halted = false;
 
+	kvm_pmu_reset(vcpu);
+
 	return kvm_x86_ops->vcpu_reset(vcpu);
 }
 
@@ -6558,6 +6560,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 		goto fail_free_mce_banks;
 
 	kvm_async_pf_hash_reset(vcpu);
+	kvm_pmu_init(vcpu);
 
 	return 0;
 fail_free_mce_banks:
@@ -6576,6 +6579,7 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 {
 	int idx;
 
+	kvm_pmu_destroy(vcpu);
 	kfree(vcpu->arch.mce_banks);
 	kvm_free_lapic(vcpu);
 	idx = srcu_read_lock(&vcpu->kvm->srcu);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index c6a2ec9..7ad40d5 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -52,6 +52,7 @@
 #define KVM_REQ_STEAL_UPDATE      13
 #define KVM_REQ_NMI               14
 #define KVM_REQ_IMMEDIATE_EXIT    15
+#define KVM_REQ_PMU               16
 
 #define KVM_USERSPACE_IRQ_SOURCE_ID	0
 
-- 
1.7.5.3

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