arch/x86/kvm/pmu_intel.c - linux-mtk - Git at Google

 /*
  * KVM PMU support for Intel CPUs
  *
  * Copyright 2011 Red Hat, Inc. and/or its affiliates.
  *
  * Authors:
  *   Avi Kivity   <avi@redhat.com>
  *   Gleb Natapov <gleb@redhat.com>
  *
  * 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 <asm/perf_event.h>
 #include "x86.h"
 #include "cpuid.h"
 #include "lapic.h"
 #include "pmu.h"

 static struct kvm_event_hw_type_mapping intel_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 },
 	[7] = { 0x00, 0x30, PERF_COUNT_HW_REF_CPU_CYCLES },
 };

 /* mapping between fixed pmc index and intel_arch_events array */
 static int fixed_pmc_events[] = {1, 0, 7};

 static void reprogram_fixed_counters(struct kvm_pmu *pmu, u64 data)
 {
 	int i;

 	for (i = 0; i < pmu->nr_arch_fixed_counters; i++) {
 		u8 new_ctrl = fixed_ctrl_field(data, i);
 		u8 old_ctrl = fixed_ctrl_field(pmu->fixed_ctr_ctrl, i);
 		struct kvm_pmc *pmc;

 		pmc = get_fixed_pmc(pmu, MSR_CORE_PERF_FIXED_CTR0 + i);

 		if (old_ctrl == new_ctrl)
 			continue;

 		reprogram_fixed_counter(pmc, new_ctrl, i);
 	}

 	pmu->fixed_ctr_ctrl = data;
 }

 /* function is called when global control register has been updated. */
 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_counter(pmu, bit);
 }

 static unsigned intel_find_arch_event(struct kvm_pmu *pmu,
 				      u8 event_select,
 				      u8 unit_mask)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(intel_arch_events); i++)
 		if (intel_arch_events[i].eventsel == event_select
 		    && intel_arch_events[i].unit_mask == unit_mask
 		    && (pmu->available_event_types & (1 << i)))
 			break;

 	if (i == ARRAY_SIZE(intel_arch_events))
 		return PERF_COUNT_HW_MAX;

 	return intel_arch_events[i].event_type;
 }

 static unsigned intel_find_fixed_event(int idx)
 {
 	u32 event;
 	size_t size = ARRAY_SIZE(fixed_pmc_events);

 	if (idx >= size)
 		return PERF_COUNT_HW_MAX;

 	event = fixed_pmc_events[array_index_nospec(idx, size)];
 	return intel_arch_events[event].event_type;
 }

 /* check if a PMC is enabled by comparing it with globl_ctrl bits. */
 static bool intel_pmc_is_enabled(struct kvm_pmc *pmc)
 {
 	struct kvm_pmu *pmu = pmc_to_pmu(pmc);

 	return test_bit(pmc->idx, (unsigned long *)&pmu->global_ctrl);
 }

 static struct kvm_pmc *intel_pmc_idx_to_pmc(struct kvm_pmu *pmu, int pmc_idx)
 {
 	if (pmc_idx < INTEL_PMC_IDX_FIXED)
 		return get_gp_pmc(pmu, MSR_P6_EVNTSEL0 + pmc_idx,
 				  MSR_P6_EVNTSEL0);
 	else {
 		u32 idx = pmc_idx - INTEL_PMC_IDX_FIXED;

 		return get_fixed_pmc(pmu, idx + MSR_CORE_PERF_FIXED_CTR0);
 	}
 }

 /* returns 0 if idx's corresponding MSR exists; otherwise returns 1. */
 static int intel_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned idx)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
 	bool fixed = idx & (1u << 30);

 	idx &= ~(3u << 30);

 	return (!fixed && idx >= pmu->nr_arch_gp_counters) ||
 		(fixed && idx >= pmu->nr_arch_fixed_counters);
 }

 static struct kvm_pmc *intel_msr_idx_to_pmc(struct kvm_vcpu *vcpu,
 					    unsigned idx, u64 *mask)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
 	bool fixed = idx & (1u << 30);
 	struct kvm_pmc *counters;
 	unsigned int num_counters;

 	idx &= ~(3u << 30);
 	if (fixed) {
 		counters = pmu->fixed_counters;
 		num_counters = pmu->nr_arch_fixed_counters;
 	} else {
 		counters = pmu->gp_counters;
 		num_counters = pmu->nr_arch_gp_counters;
 	}
 	if (idx >= num_counters)
 		return NULL;
 	*mask &= pmu->counter_bitmask[fixed ? KVM_PMC_FIXED : KVM_PMC_GP];
 	return &counters[array_index_nospec(idx, num_counters)];
 }

 static bool intel_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
 	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;
 }

 static int intel_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
 	struct kvm_pmc *pmc;

 	switch (msr) {
 	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, msr, MSR_IA32_PERFCTR0))) {
 			u64 val = pmc_read_counter(pmc);
 			*data = val & pmu->counter_bitmask[KVM_PMC_GP];
 			return 0;
 		} else if ((pmc = get_fixed_pmc(pmu, msr))) {
 			u64 val = pmc_read_counter(pmc);
 			*data = val & pmu->counter_bitmask[KVM_PMC_FIXED];
 			return 0;
 		} else if ((pmc = get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0))) {
 			*data = pmc->eventsel;
 			return 0;
 		}
 	}

 	return 1;
 }

 static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
 	struct kvm_pmc *pmc;
 	u32 msr = msr_info->index;
 	u64 data = msr_info->data;

 	switch (msr) {
 	case MSR_CORE_PERF_FIXED_CTR_CTRL:
 		if (pmu->fixed_ctr_ctrl == data)
 			return 0;
 		if (!(data & 0xfffffffffffff444ull)) {
 			reprogram_fixed_counters(pmu, data);
 			return 0;
 		}
 		break;
 	case MSR_CORE_PERF_GLOBAL_STATUS:
 		if (msr_info->host_initiated) {
 			pmu->global_status = data;
 			return 0;
 		}
 		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)))) {
 			if (!msr_info->host_initiated)
 				pmu->global_status &= ~data;
 			pmu->global_ovf_ctrl = data;
 			return 0;
 		}
 		break;
 	default:
 		if ((pmc = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0))) {
 			if (msr_info->host_initiated)
 				pmc->counter = data;
 			else
 				pmc->counter = (s32)data;
 			return 0;
 		} else if ((pmc = get_fixed_pmc(pmu, msr))) {
 			pmc->counter = data;
 			return 0;
 		} else if ((pmc = get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0))) {
 			if (data == pmc->eventsel)
 				return 0;
 			if (!(data & pmu->reserved_bits)) {
 				reprogram_gp_counter(pmc, data);
 				return 0;
 			}
 		}
 	}

 	return 1;
 }

 static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
 	struct kvm_cpuid_entry2 *entry;
 	union cpuid10_eax eax;
 	union cpuid10_edx edx;

 	pmu->nr_arch_gp_counters = 0;
 	pmu->nr_arch_fixed_counters = 0;
 	pmu->counter_bitmask[KVM_PMC_GP] = 0;
 	pmu->counter_bitmask[KVM_PMC_FIXED] = 0;
 	pmu->version = 0;
 	pmu->reserved_bits = 0xffffffff00200000ull;

 	entry = kvm_find_cpuid_entry(vcpu, 0xa, 0);
 	if (!entry)
 		return;
 	eax.full = entry->eax;
 	edx.full = entry->edx;

 	pmu->version = eax.split.version_id;
 	if (!pmu->version)
 		return;

 	pmu->nr_arch_gp_counters = min_t(int, eax.split.num_counters,
 					INTEL_PMC_MAX_GENERIC);
 	pmu->counter_bitmask[KVM_PMC_GP] = ((u64)1 << eax.split.bit_width) - 1;
 	pmu->available_event_types = ~entry->ebx &
 					((1ull << eax.split.mask_length) - 1);

 	if (pmu->version == 1) {
 		pmu->nr_arch_fixed_counters = 0;
 	} else {
 		pmu->nr_arch_fixed_counters =
 			min_t(int, edx.split.num_counters_fixed,
 				INTEL_PMC_MAX_FIXED);
 		pmu->counter_bitmask[KVM_PMC_FIXED] =
 			((u64)1 << edx.split.bit_width_fixed) - 1;
 	}

 	pmu->global_ctrl = ((1ull << pmu->nr_arch_gp_counters) - 1) |
 		(((1ull << pmu->nr_arch_fixed_counters) - 1) << INTEL_PMC_IDX_FIXED);
 	pmu->global_ctrl_mask = ~pmu->global_ctrl;

 	entry = kvm_find_cpuid_entry(vcpu, 7, 0);
 	if (entry &&
 	    (boot_cpu_has(X86_FEATURE_HLE) || boot_cpu_has(X86_FEATURE_RTM)) &&
 	    (entry->ebx & (X86_FEATURE_HLE|X86_FEATURE_RTM)))
 		pmu->reserved_bits ^= HSW_IN_TX|HSW_IN_TX_CHECKPOINTED;
 }

 static void intel_pmu_init(struct kvm_vcpu *vcpu)
 {
 	int i;
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);

 	for (i = 0; i < INTEL_PMC_MAX_GENERIC; i++) {
 		pmu->gp_counters[i].type = KVM_PMC_GP;
 		pmu->gp_counters[i].vcpu = vcpu;
 		pmu->gp_counters[i].idx = i;
 	}

 	for (i = 0; i < INTEL_PMC_MAX_FIXED; i++) {
 		pmu->fixed_counters[i].type = KVM_PMC_FIXED;
 		pmu->fixed_counters[i].vcpu = vcpu;
 		pmu->fixed_counters[i].idx = i + INTEL_PMC_IDX_FIXED;
 	}
 }

 static void intel_pmu_reset(struct kvm_vcpu *vcpu)
 {
 	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
 	int i;

 	for (i = 0; i < INTEL_PMC_MAX_GENERIC; i++) {
 		struct kvm_pmc *pmc = &pmu->gp_counters[i];

 		pmc_stop_counter(pmc);
 		pmc->counter = pmc->eventsel = 0;
 	}

 	for (i = 0; i < INTEL_PMC_MAX_FIXED; i++)
 		pmc_stop_counter(&pmu->fixed_counters[i]);

 	pmu->fixed_ctr_ctrl = pmu->global_ctrl = pmu->global_status =
 		pmu->global_ovf_ctrl = 0;
 }

 struct kvm_pmu_ops intel_pmu_ops = {
 	.find_arch_event = intel_find_arch_event,
 	.find_fixed_event = intel_find_fixed_event,
 	.pmc_is_enabled = intel_pmc_is_enabled,
 	.pmc_idx_to_pmc = intel_pmc_idx_to_pmc,
 	.msr_idx_to_pmc = intel_msr_idx_to_pmc,
 	.is_valid_msr_idx = intel_is_valid_msr_idx,
 	.is_valid_msr = intel_is_valid_msr,
 	.get_msr = intel_pmu_get_msr,
 	.set_msr = intel_pmu_set_msr,
 	.refresh = intel_pmu_refresh,
 	.init = intel_pmu_init,
 	.reset = intel_pmu_reset,
 };
	/*
	* KVM PMU support for Intel CPUs
	*
	* Copyright 2011 Red Hat, Inc. and/or its affiliates.
	*
	* Authors:
	* Avi Kivity <avi@redhat.com>
	* Gleb Natapov <gleb@redhat.com>
	*
	* 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 <asm/perf_event.h>
	#include "x86.h"
	#include "cpuid.h"
	#include "lapic.h"
	#include "pmu.h"

	static struct kvm_event_hw_type_mapping intel_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 },
	[7] = { 0x00, 0x30, PERF_COUNT_HW_REF_CPU_CYCLES },
	};

	/* mapping between fixed pmc index and intel_arch_events array */
	static int fixed_pmc_events[] = {1, 0, 7};

	static void reprogram_fixed_counters(struct kvm_pmu *pmu, u64 data)
	{
	int i;

	for (i = 0; i < pmu->nr_arch_fixed_counters; i++) {
	u8 new_ctrl = fixed_ctrl_field(data, i);
	u8 old_ctrl = fixed_ctrl_field(pmu->fixed_ctr_ctrl, i);
	struct kvm_pmc *pmc;

	pmc = get_fixed_pmc(pmu, MSR_CORE_PERF_FIXED_CTR0 + i);

	if (old_ctrl == new_ctrl)
	continue;

	reprogram_fixed_counter(pmc, new_ctrl, i);
	}

	pmu->fixed_ctr_ctrl = data;
	}

	/* function is called when global control register has been updated. */
	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_counter(pmu, bit);
	}

	static unsigned intel_find_arch_event(struct kvm_pmu *pmu,
	u8 event_select,
	u8 unit_mask)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(intel_arch_events); i++)
	if (intel_arch_events[i].eventsel == event_select
	&& intel_arch_events[i].unit_mask == unit_mask
	&& (pmu->available_event_types & (1 << i)))
	break;

	if (i == ARRAY_SIZE(intel_arch_events))
	return PERF_COUNT_HW_MAX;

	return intel_arch_events[i].event_type;
	}

	static unsigned intel_find_fixed_event(int idx)
	{
	u32 event;
	size_t size = ARRAY_SIZE(fixed_pmc_events);

	if (idx >= size)
	return PERF_COUNT_HW_MAX;

	event = fixed_pmc_events[array_index_nospec(idx, size)];
	return intel_arch_events[event].event_type;
	}

	/* check if a PMC is enabled by comparing it with globl_ctrl bits. */
	static bool intel_pmc_is_enabled(struct kvm_pmc *pmc)
	{
	struct kvm_pmu *pmu = pmc_to_pmu(pmc);

	return test_bit(pmc->idx, (unsigned long *)&pmu->global_ctrl);
	}

	static struct kvm_pmc intel_pmc_idx_to_pmc(struct kvm_pmu pmu, int pmc_idx)
	{
	if (pmc_idx < INTEL_PMC_IDX_FIXED)
	return get_gp_pmc(pmu, MSR_P6_EVNTSEL0 + pmc_idx,
	MSR_P6_EVNTSEL0);
	else {
	u32 idx = pmc_idx - INTEL_PMC_IDX_FIXED;

	return get_fixed_pmc(pmu, idx + MSR_CORE_PERF_FIXED_CTR0);
	}
	}

	/* returns 0 if idx's corresponding MSR exists; otherwise returns 1. */
	static int intel_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned idx)
	{
	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
	bool fixed = idx & (1u << 30);

	idx &= ~(3u << 30);

	return (!fixed && idx >= pmu->nr_arch_gp_counters) \|\|
	(fixed && idx >= pmu->nr_arch_fixed_counters);
	}

	static struct kvm_pmc intel_msr_idx_to_pmc(struct kvm_vcpu vcpu,
	unsigned idx, u64 *mask)
	{
	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
	bool fixed = idx & (1u << 30);
	struct kvm_pmc *counters;
	unsigned int num_counters;

	idx &= ~(3u << 30);
	if (fixed) {
	counters = pmu->fixed_counters;
	num_counters = pmu->nr_arch_fixed_counters;
	} else {
	counters = pmu->gp_counters;
	num_counters = pmu->nr_arch_gp_counters;
	}
	if (idx >= num_counters)
	return NULL;
	*mask &= pmu->counter_bitmask[fixed ? KVM_PMC_FIXED : KVM_PMC_GP];
	return &counters[array_index_nospec(idx, num_counters)];
	}

	static bool intel_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr)
	{
	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
	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;
	}

	static int intel_pmu_get_msr(struct kvm_vcpu vcpu, u32 msr, u64 data)
	{
	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
	struct kvm_pmc *pmc;

	switch (msr) {
	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, msr, MSR_IA32_PERFCTR0))) {
	u64 val = pmc_read_counter(pmc);
	*data = val & pmu->counter_bitmask[KVM_PMC_GP];
	return 0;
	} else if ((pmc = get_fixed_pmc(pmu, msr))) {
	u64 val = pmc_read_counter(pmc);
	*data = val & pmu->counter_bitmask[KVM_PMC_FIXED];
	return 0;
	} else if ((pmc = get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0))) {
	*data = pmc->eventsel;
	return 0;
	}
	}

	return 1;
	}

	static int intel_pmu_set_msr(struct kvm_vcpu vcpu, struct msr_data msr_info)
	{
	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
	struct kvm_pmc *pmc;
	u32 msr = msr_info->index;
	u64 data = msr_info->data;

	switch (msr) {
	case MSR_CORE_PERF_FIXED_CTR_CTRL:
	if (pmu->fixed_ctr_ctrl == data)
	return 0;
	if (!(data & 0xfffffffffffff444ull)) {
	reprogram_fixed_counters(pmu, data);
	return 0;
	}
	break;
	case MSR_CORE_PERF_GLOBAL_STATUS:
	if (msr_info->host_initiated) {
	pmu->global_status = data;
	return 0;
	}
	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)))) {
	if (!msr_info->host_initiated)
	pmu->global_status &= ~data;
	pmu->global_ovf_ctrl = data;
	return 0;
	}
	break;
	default:
	if ((pmc = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0))) {
	if (msr_info->host_initiated)
	pmc->counter = data;
	else
	pmc->counter = (s32)data;
	return 0;
	} else if ((pmc = get_fixed_pmc(pmu, msr))) {
	pmc->counter = data;
	return 0;
	} else if ((pmc = get_gp_pmc(pmu, msr, MSR_P6_EVNTSEL0))) {
	if (data == pmc->eventsel)
	return 0;
	if (!(data & pmu->reserved_bits)) {
	reprogram_gp_counter(pmc, data);
	return 0;
	}
	}
	}

	return 1;
	}

	static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
	{
	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
	struct kvm_cpuid_entry2 *entry;
	union cpuid10_eax eax;
	union cpuid10_edx edx;

	pmu->nr_arch_gp_counters = 0;
	pmu->nr_arch_fixed_counters = 0;
	pmu->counter_bitmask[KVM_PMC_GP] = 0;
	pmu->counter_bitmask[KVM_PMC_FIXED] = 0;
	pmu->version = 0;
	pmu->reserved_bits = 0xffffffff00200000ull;

	entry = kvm_find_cpuid_entry(vcpu, 0xa, 0);
	if (!entry)
	return;
	eax.full = entry->eax;
	edx.full = entry->edx;

	pmu->version = eax.split.version_id;
	if (!pmu->version)
	return;

	pmu->nr_arch_gp_counters = min_t(int, eax.split.num_counters,
	INTEL_PMC_MAX_GENERIC);
	pmu->counter_bitmask[KVM_PMC_GP] = ((u64)1 << eax.split.bit_width) - 1;
	pmu->available_event_types = ~entry->ebx &
	((1ull << eax.split.mask_length) - 1);

	if (pmu->version == 1) {
	pmu->nr_arch_fixed_counters = 0;
	} else {
	pmu->nr_arch_fixed_counters =
	min_t(int, edx.split.num_counters_fixed,
	INTEL_PMC_MAX_FIXED);
	pmu->counter_bitmask[KVM_PMC_FIXED] =
	((u64)1 << edx.split.bit_width_fixed) - 1;
	}

	pmu->global_ctrl = ((1ull << pmu->nr_arch_gp_counters) - 1) \|
	(((1ull << pmu->nr_arch_fixed_counters) - 1) << INTEL_PMC_IDX_FIXED);
	pmu->global_ctrl_mask = ~pmu->global_ctrl;

	entry = kvm_find_cpuid_entry(vcpu, 7, 0);
	if (entry &&
	(boot_cpu_has(X86_FEATURE_HLE) \|\| boot_cpu_has(X86_FEATURE_RTM)) &&
	(entry->ebx & (X86_FEATURE_HLE\|X86_FEATURE_RTM)))
	pmu->reserved_bits ^= HSW_IN_TX\|HSW_IN_TX_CHECKPOINTED;
	}

	static void intel_pmu_init(struct kvm_vcpu *vcpu)
	{
	int i;
	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);

	for (i = 0; i < INTEL_PMC_MAX_GENERIC; i++) {
	pmu->gp_counters[i].type = KVM_PMC_GP;
	pmu->gp_counters[i].vcpu = vcpu;
	pmu->gp_counters[i].idx = i;
	}

	for (i = 0; i < INTEL_PMC_MAX_FIXED; i++) {
	pmu->fixed_counters[i].type = KVM_PMC_FIXED;
	pmu->fixed_counters[i].vcpu = vcpu;
	pmu->fixed_counters[i].idx = i + INTEL_PMC_IDX_FIXED;
	}
	}

	static void intel_pmu_reset(struct kvm_vcpu *vcpu)
	{
	struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
	int i;

	for (i = 0; i < INTEL_PMC_MAX_GENERIC; i++) {
	struct kvm_pmc *pmc = &pmu->gp_counters[i];

	pmc_stop_counter(pmc);
	pmc->counter = pmc->eventsel = 0;
	}

	for (i = 0; i < INTEL_PMC_MAX_FIXED; i++)
	pmc_stop_counter(&pmu->fixed_counters[i]);

	pmu->fixed_ctr_ctrl = pmu->global_ctrl = pmu->global_status =
	pmu->global_ovf_ctrl = 0;
	}

	struct kvm_pmu_ops intel_pmu_ops = {
	.find_arch_event = intel_find_arch_event,
	.find_fixed_event = intel_find_fixed_event,
	.pmc_is_enabled = intel_pmc_is_enabled,
	.pmc_idx_to_pmc = intel_pmc_idx_to_pmc,
	.msr_idx_to_pmc = intel_msr_idx_to_pmc,
	.is_valid_msr_idx = intel_is_valid_msr_idx,
	.is_valid_msr = intel_is_valid_msr,
	.get_msr = intel_pmu_get_msr,
	.set_msr = intel_pmu_set_msr,
	.refresh = intel_pmu_refresh,
	.init = intel_pmu_init,
	.reset = intel_pmu_reset,
	};