Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 633 insertions, 0 deletions

diff --git a/arch/riscv/kvm/vcpu_pmu.c b/arch/riscv/kvm/vcpu_pmu.c
new file mode 100644
index 0000000000..86391a5061
--- /dev/null
+++ b/arch/riscv/kvm/vcpu_pmu.c
@@ -0,0 +1,633 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 Rivos Inc
+ *
+ * Authors:
+ *     Atish Patra <atishp@rivosinc.com>
+ */
+
+#define pr_fmt(fmt)	"riscv-kvm-pmu: " fmt
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/kvm_host.h>
+#include <linux/perf/riscv_pmu.h>
+#include <asm/csr.h>
+#include <asm/kvm_vcpu_sbi.h>
+#include <asm/kvm_vcpu_pmu.h>
+#include <linux/bitops.h>
+
+#define kvm_pmu_num_counters(pmu) ((pmu)->num_hw_ctrs + (pmu)->num_fw_ctrs)
+#define get_event_type(x) (((x) & SBI_PMU_EVENT_IDX_TYPE_MASK) >> 16)
+#define get_event_code(x) ((x) & SBI_PMU_EVENT_IDX_CODE_MASK)
+
+static enum perf_hw_id hw_event_perf_map[SBI_PMU_HW_GENERAL_MAX] = {
+	[SBI_PMU_HW_CPU_CYCLES] = PERF_COUNT_HW_CPU_CYCLES,
+	[SBI_PMU_HW_INSTRUCTIONS] = PERF_COUNT_HW_INSTRUCTIONS,
+	[SBI_PMU_HW_CACHE_REFERENCES] = PERF_COUNT_HW_CACHE_REFERENCES,
+	[SBI_PMU_HW_CACHE_MISSES] = PERF_COUNT_HW_CACHE_MISSES,
+	[SBI_PMU_HW_BRANCH_INSTRUCTIONS] = PERF_COUNT_HW_BRANCH_INSTRUCTIONS,
+	[SBI_PMU_HW_BRANCH_MISSES] = PERF_COUNT_HW_BRANCH_MISSES,
+	[SBI_PMU_HW_BUS_CYCLES] = PERF_COUNT_HW_BUS_CYCLES,
+	[SBI_PMU_HW_STALLED_CYCLES_FRONTEND] = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND,
+	[SBI_PMU_HW_STALLED_CYCLES_BACKEND] = PERF_COUNT_HW_STALLED_CYCLES_BACKEND,
+	[SBI_PMU_HW_REF_CPU_CYCLES] = PERF_COUNT_HW_REF_CPU_CYCLES,
+};
+
+static u64 kvm_pmu_get_sample_period(struct kvm_pmc *pmc)
+{
+	u64 counter_val_mask = GENMASK(pmc->cinfo.width, 0);
+	u64 sample_period;
+
+	if (!pmc->counter_val)
+		sample_period = counter_val_mask + 1;
+	else
+		sample_period = (-pmc->counter_val) & counter_val_mask;
+
+	return sample_period;
+}
+
+static u32 kvm_pmu_get_perf_event_type(unsigned long eidx)
+{
+	enum sbi_pmu_event_type etype = get_event_type(eidx);
+	u32 type = PERF_TYPE_MAX;
+
+	switch (etype) {
+	case SBI_PMU_EVENT_TYPE_HW:
+		type = PERF_TYPE_HARDWARE;
+		break;
+	case SBI_PMU_EVENT_TYPE_CACHE:
+		type = PERF_TYPE_HW_CACHE;
+		break;
+	case SBI_PMU_EVENT_TYPE_RAW:
+	case SBI_PMU_EVENT_TYPE_FW:
+		type = PERF_TYPE_RAW;
+		break;
+	default:
+		break;
+	}
+
+	return type;
+}
+
+static bool kvm_pmu_is_fw_event(unsigned long eidx)
+{
+	return get_event_type(eidx) == SBI_PMU_EVENT_TYPE_FW;
+}
+
+static void kvm_pmu_release_perf_event(struct kvm_pmc *pmc)
+{
+	if (pmc->perf_event) {
+		perf_event_disable(pmc->perf_event);
+		perf_event_release_kernel(pmc->perf_event);
+		pmc->perf_event = NULL;
+	}
+}
+
+static u64 kvm_pmu_get_perf_event_hw_config(u32 sbi_event_code)
+{
+	return hw_event_perf_map[sbi_event_code];
+}
+
+static u64 kvm_pmu_get_perf_event_cache_config(u32 sbi_event_code)
+{
+	u64 config = U64_MAX;
+	unsigned int cache_type, cache_op, cache_result;
+
+	/* All the cache event masks lie within 0xFF. No separate masking is necessary */
+	cache_type = (sbi_event_code & SBI_PMU_EVENT_CACHE_ID_CODE_MASK) >>
+		      SBI_PMU_EVENT_CACHE_ID_SHIFT;
+	cache_op = (sbi_event_code & SBI_PMU_EVENT_CACHE_OP_ID_CODE_MASK) >>
+		    SBI_PMU_EVENT_CACHE_OP_SHIFT;
+	cache_result = sbi_event_code & SBI_PMU_EVENT_CACHE_RESULT_ID_CODE_MASK;
+
+	if (cache_type >= PERF_COUNT_HW_CACHE_MAX ||
+	    cache_op >= PERF_COUNT_HW_CACHE_OP_MAX ||
+	    cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
+		return config;
+
+	config = cache_type | (cache_op << 8) | (cache_result << 16);
+
+	return config;
+}
+
+static u64 kvm_pmu_get_perf_event_config(unsigned long eidx, uint64_t evt_data)
+{
+	enum sbi_pmu_event_type etype = get_event_type(eidx);
+	u32 ecode = get_event_code(eidx);
+	u64 config = U64_MAX;
+
+	switch (etype) {
+	case SBI_PMU_EVENT_TYPE_HW:
+		if (ecode < SBI_PMU_HW_GENERAL_MAX)
+			config = kvm_pmu_get_perf_event_hw_config(ecode);
+		break;
+	case SBI_PMU_EVENT_TYPE_CACHE:
+		config = kvm_pmu_get_perf_event_cache_config(ecode);
+		break;
+	case SBI_PMU_EVENT_TYPE_RAW:
+		config = evt_data & RISCV_PMU_RAW_EVENT_MASK;
+		break;
+	case SBI_PMU_EVENT_TYPE_FW:
+		if (ecode < SBI_PMU_FW_MAX)
+			config = (1ULL << 63) | ecode;
+		break;
+	default:
+		break;
+	}
+
+	return config;
+}
+
+static int kvm_pmu_get_fixed_pmc_index(unsigned long eidx)
+{
+	u32 etype = kvm_pmu_get_perf_event_type(eidx);
+	u32 ecode = get_event_code(eidx);
+
+	if (etype != SBI_PMU_EVENT_TYPE_HW)
+		return -EINVAL;
+
+	if (ecode == SBI_PMU_HW_CPU_CYCLES)
+		return 0;
+	else if (ecode == SBI_PMU_HW_INSTRUCTIONS)
+		return 2;
+	else
+		return -EINVAL;
+}
+
+static int kvm_pmu_get_programmable_pmc_index(struct kvm_pmu *kvpmu, unsigned long eidx,
+					      unsigned long cbase, unsigned long cmask)
+{
+	int ctr_idx = -1;
+	int i, pmc_idx;
+	int min, max;
+
+	if (kvm_pmu_is_fw_event(eidx)) {
+		/* Firmware counters are mapped 1:1 starting from num_hw_ctrs for simplicity */
+		min = kvpmu->num_hw_ctrs;
+		max = min + kvpmu->num_fw_ctrs;
+	} else {
+		/* First 3 counters are reserved for fixed counters */
+		min = 3;
+		max = kvpmu->num_hw_ctrs;
+	}
+
+	for_each_set_bit(i, &cmask, BITS_PER_LONG) {
+		pmc_idx = i + cbase;
+		if ((pmc_idx >= min && pmc_idx < max) &&
+		    !test_bit(pmc_idx, kvpmu->pmc_in_use)) {
+			ctr_idx = pmc_idx;
+			break;
+		}
+	}
+
+	return ctr_idx;
+}
+
+static int pmu_get_pmc_index(struct kvm_pmu *pmu, unsigned long eidx,
+			     unsigned long cbase, unsigned long cmask)
+{
+	int ret;
+
+	/* Fixed counters need to be have fixed mapping as they have different width */
+	ret = kvm_pmu_get_fixed_pmc_index(eidx);
+	if (ret >= 0)
+		return ret;
+
+	return kvm_pmu_get_programmable_pmc_index(pmu, eidx, cbase, cmask);
+}
+
+static int pmu_ctr_read(struct kvm_vcpu *vcpu, unsigned long cidx,
+			unsigned long *out_val)
+{
+	struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
+	struct kvm_pmc *pmc;
+	u64 enabled, running;
+	int fevent_code;
+
+	pmc = &kvpmu->pmc[cidx];
+
+	if (pmc->cinfo.type == SBI_PMU_CTR_TYPE_FW) {
+		fevent_code = get_event_code(pmc->event_idx);
+		pmc->counter_val = kvpmu->fw_event[fevent_code].value;
+	} else if (pmc->perf_event) {
+		pmc->counter_val += perf_event_read_value(pmc->perf_event, &enabled, &running);
+	} else {
+		return -EINVAL;
+	}
+	*out_val = pmc->counter_val;
+
+	return 0;
+}
+
+static int kvm_pmu_validate_counter_mask(struct kvm_pmu *kvpmu, unsigned long ctr_base,
+					 unsigned long ctr_mask)
+{
+	/* Make sure the we have a valid counter mask requested from the caller */
+	if (!ctr_mask || (ctr_base + __fls(ctr_mask) >= kvm_pmu_num_counters(kvpmu)))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int kvm_pmu_create_perf_event(struct kvm_pmc *pmc, struct perf_event_attr *attr,
+				     unsigned long flags, unsigned long eidx, unsigned long evtdata)
+{
+	struct perf_event *event;
+
+	kvm_pmu_release_perf_event(pmc);
+	attr->config = kvm_pmu_get_perf_event_config(eidx, evtdata);
+	if (flags & SBI_PMU_CFG_FLAG_CLEAR_VALUE) {
+		//TODO: Do we really want to clear the value in hardware counter
+		pmc->counter_val = 0;
+	}
+
+	/*
+	 * Set the default sample_period for now. The guest specified value
+	 * will be updated in the start call.
+	 */
+	attr->sample_period = kvm_pmu_get_sample_period(pmc);
+
+	event = perf_event_create_kernel_counter(attr, -1, current, NULL, pmc);
+	if (IS_ERR(event)) {
+		pr_err("kvm pmu event creation failed for eidx %lx: %ld\n", eidx, PTR_ERR(event));
+		return PTR_ERR(event);
+	}
+
+	pmc->perf_event = event;
+	if (flags & SBI_PMU_CFG_FLAG_AUTO_START)
+		perf_event_enable(pmc->perf_event);
+
+	return 0;
+}
+
+int kvm_riscv_vcpu_pmu_incr_fw(struct kvm_vcpu *vcpu, unsigned long fid)
+{
+	struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
+	struct kvm_fw_event *fevent;
+
+	if (!kvpmu || fid >= SBI_PMU_FW_MAX)
+		return -EINVAL;
+
+	fevent = &kvpmu->fw_event[fid];
+	if (fevent->started)
+		fevent->value++;
+
+	return 0;
+}
+
+int kvm_riscv_vcpu_pmu_read_hpm(struct kvm_vcpu *vcpu, unsigned int csr_num,
+				unsigned long *val, unsigned long new_val,
+				unsigned long wr_mask)
+{
+	struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
+	int cidx, ret = KVM_INSN_CONTINUE_NEXT_SEPC;
+
+	if (!kvpmu || !kvpmu->init_done) {
+		/*
+		 * In absence of sscofpmf in the platform, the guest OS may use
+		 * the legacy PMU driver to read cycle/instret. In that case,
+		 * just return 0 to avoid any illegal trap. However, any other
+		 * hpmcounter access should result in illegal trap as they must
+		 * be access through SBI PMU only.
+		 */
+		if (csr_num == CSR_CYCLE || csr_num == CSR_INSTRET) {
+			*val = 0;
+			return ret;
+		} else {
+			return KVM_INSN_ILLEGAL_TRAP;
+		}
+	}
+
+	/* The counter CSR are read only. Thus, any write should result in illegal traps */
+	if (wr_mask)
+		return KVM_INSN_ILLEGAL_TRAP;
+
+	cidx = csr_num - CSR_CYCLE;
+
+	if (pmu_ctr_read(vcpu, cidx, val) < 0)
+		return KVM_INSN_ILLEGAL_TRAP;
+
+	return ret;
+}
+
+int kvm_riscv_vcpu_pmu_num_ctrs(struct kvm_vcpu *vcpu,
+				struct kvm_vcpu_sbi_return *retdata)
+{
+	struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
+
+	retdata->out_val = kvm_pmu_num_counters(kvpmu);
+
+	return 0;
+}
+
+int kvm_riscv_vcpu_pmu_ctr_info(struct kvm_vcpu *vcpu, unsigned long cidx,
+				struct kvm_vcpu_sbi_return *retdata)
+{
+	struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
+
+	if (cidx > RISCV_KVM_MAX_COUNTERS || cidx == 1) {
+		retdata->err_val = SBI_ERR_INVALID_PARAM;
+		return 0;
+	}
+
+	retdata->out_val = kvpmu->pmc[cidx].cinfo.value;
+
+	return 0;
+}
+
+int kvm_riscv_vcpu_pmu_ctr_start(struct kvm_vcpu *vcpu, unsigned long ctr_base,
+				 unsigned long ctr_mask, unsigned long flags, u64 ival,
+				 struct kvm_vcpu_sbi_return *retdata)
+{
+	struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
+	int i, pmc_index, sbiret = 0;
+	struct kvm_pmc *pmc;
+	int fevent_code;
+
+	if (kvm_pmu_validate_counter_mask(kvpmu, ctr_base, ctr_mask) < 0) {
+		sbiret = SBI_ERR_INVALID_PARAM;
+		goto out;
+	}
+
+	/* Start the counters that have been configured and requested by the guest */
+	for_each_set_bit(i, &ctr_mask, RISCV_MAX_COUNTERS) {
+		pmc_index = i + ctr_base;
+		if (!test_bit(pmc_index, kvpmu->pmc_in_use))
+			continue;
+		pmc = &kvpmu->pmc[pmc_index];
+		if (flags & SBI_PMU_START_FLAG_SET_INIT_VALUE)
+			pmc->counter_val = ival;
+		if (pmc->cinfo.type == SBI_PMU_CTR_TYPE_FW) {
+			fevent_code = get_event_code(pmc->event_idx);
+			if (fevent_code >= SBI_PMU_FW_MAX) {
+				sbiret = SBI_ERR_INVALID_PARAM;
+				goto out;
+			}
+
+			/* Check if the counter was already started for some reason */
+			if (kvpmu->fw_event[fevent_code].started) {
+				sbiret = SBI_ERR_ALREADY_STARTED;
+				continue;
+			}
+
+			kvpmu->fw_event[fevent_code].started = true;
+			kvpmu->fw_event[fevent_code].value = pmc->counter_val;
+		} else if (pmc->perf_event) {
+			if (unlikely(pmc->started)) {
+				sbiret = SBI_ERR_ALREADY_STARTED;
+				continue;
+			}
+			perf_event_period(pmc->perf_event, kvm_pmu_get_sample_period(pmc));
+			perf_event_enable(pmc->perf_event);
+			pmc->started = true;
+		} else {
+			sbiret = SBI_ERR_INVALID_PARAM;
+		}
+	}
+
+out:
+	retdata->err_val = sbiret;
+
+	return 0;
+}
+
+int kvm_riscv_vcpu_pmu_ctr_stop(struct kvm_vcpu *vcpu, unsigned long ctr_base,
+				unsigned long ctr_mask, unsigned long flags,
+				struct kvm_vcpu_sbi_return *retdata)
+{
+	struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
+	int i, pmc_index, sbiret = 0;
+	u64 enabled, running;
+	struct kvm_pmc *pmc;
+	int fevent_code;
+
+	if (kvm_pmu_validate_counter_mask(kvpmu, ctr_base, ctr_mask) < 0) {
+		sbiret = SBI_ERR_INVALID_PARAM;
+		goto out;
+	}
+
+	/* Stop the counters that have been configured and requested by the guest */
+	for_each_set_bit(i, &ctr_mask, RISCV_MAX_COUNTERS) {
+		pmc_index = i + ctr_base;
+		if (!test_bit(pmc_index, kvpmu->pmc_in_use))
+			continue;
+		pmc = &kvpmu->pmc[pmc_index];
+		if (pmc->cinfo.type == SBI_PMU_CTR_TYPE_FW) {
+			fevent_code = get_event_code(pmc->event_idx);
+			if (fevent_code >= SBI_PMU_FW_MAX) {
+				sbiret = SBI_ERR_INVALID_PARAM;
+				goto out;
+			}
+
+			if (!kvpmu->fw_event[fevent_code].started)
+				sbiret = SBI_ERR_ALREADY_STOPPED;
+
+			kvpmu->fw_event[fevent_code].started = false;
+		} else if (pmc->perf_event) {
+			if (pmc->started) {
+				/* Stop counting the counter */
+				perf_event_disable(pmc->perf_event);
+				pmc->started = false;
+			} else {
+				sbiret = SBI_ERR_ALREADY_STOPPED;
+			}
+
+			if (flags & SBI_PMU_STOP_FLAG_RESET) {
+				/* Relase the counter if this is a reset request */
+				pmc->counter_val += perf_event_read_value(pmc->perf_event,
+									  &enabled, &running);
+				kvm_pmu_release_perf_event(pmc);
+			}
+		} else {
+			sbiret = SBI_ERR_INVALID_PARAM;
+		}
+		if (flags & SBI_PMU_STOP_FLAG_RESET) {
+			pmc->event_idx = SBI_PMU_EVENT_IDX_INVALID;
+			clear_bit(pmc_index, kvpmu->pmc_in_use);
+		}
+	}
+
+out:
+	retdata->err_val = sbiret;
+
+	return 0;
+}
+
+int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcpu, unsigned long ctr_base,
+				     unsigned long ctr_mask, unsigned long flags,
+				     unsigned long eidx, u64 evtdata,
+				     struct kvm_vcpu_sbi_return *retdata)
+{
+	int ctr_idx, ret, sbiret = 0;
+	bool is_fevent;
+	unsigned long event_code;
+	u32 etype = kvm_pmu_get_perf_event_type(eidx);
+	struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
+	struct kvm_pmc *pmc = NULL;
+	struct perf_event_attr attr = {
+		.type = etype,
+		.size = sizeof(struct perf_event_attr),
+		.pinned = true,
+		/*
+		 * It should never reach here if the platform doesn't support the sscofpmf
+		 * extension as mode filtering won't work without it.
+		 */
+		.exclude_host = true,
+		.exclude_hv = true,
+		.exclude_user = !!(flags & SBI_PMU_CFG_FLAG_SET_UINH),
+		.exclude_kernel = !!(flags & SBI_PMU_CFG_FLAG_SET_SINH),
+		.config1 = RISCV_PMU_CONFIG1_GUEST_EVENTS,
+	};
+
+	if (kvm_pmu_validate_counter_mask(kvpmu, ctr_base, ctr_mask) < 0) {
+		sbiret = SBI_ERR_INVALID_PARAM;
+		goto out;
+	}
+
+	event_code = get_event_code(eidx);
+	is_fevent = kvm_pmu_is_fw_event(eidx);
+	if (is_fevent && event_code >= SBI_PMU_FW_MAX) {
+		sbiret = SBI_ERR_NOT_SUPPORTED;
+		goto out;
+	}
+
+	/*
+	 * SKIP_MATCH flag indicates the caller is aware of the assigned counter
+	 * for this event. Just do a sanity check if it already marked used.
+	 */
+	if (flags & SBI_PMU_CFG_FLAG_SKIP_MATCH) {
+		if (!test_bit(ctr_base + __ffs(ctr_mask), kvpmu->pmc_in_use)) {
+			sbiret = SBI_ERR_FAILURE;
+			goto out;
+		}
+		ctr_idx = ctr_base + __ffs(ctr_mask);
+	} else  {
+		ctr_idx = pmu_get_pmc_index(kvpmu, eidx, ctr_base, ctr_mask);
+		if (ctr_idx < 0) {
+			sbiret = SBI_ERR_NOT_SUPPORTED;
+			goto out;
+		}
+	}
+
+	pmc = &kvpmu->pmc[ctr_idx];
+	pmc->idx = ctr_idx;
+
+	if (is_fevent) {
+		if (flags & SBI_PMU_CFG_FLAG_AUTO_START)
+			kvpmu->fw_event[event_code].started = true;
+	} else {
+		ret = kvm_pmu_create_perf_event(pmc, &attr, flags, eidx, evtdata);
+		if (ret)
+			return ret;
+	}
+
+	set_bit(ctr_idx, kvpmu->pmc_in_use);
+	pmc->event_idx = eidx;
+	retdata->out_val = ctr_idx;
+out:
+	retdata->err_val = sbiret;
+
+	return 0;
+}
+
+int kvm_riscv_vcpu_pmu_ctr_read(struct kvm_vcpu *vcpu, unsigned long cidx,
+				struct kvm_vcpu_sbi_return *retdata)
+{
+	int ret;
+
+	ret = pmu_ctr_read(vcpu, cidx, &retdata->out_val);
+	if (ret == -EINVAL)
+		retdata->err_val = SBI_ERR_INVALID_PARAM;
+
+	return 0;
+}
+
+void kvm_riscv_vcpu_pmu_init(struct kvm_vcpu *vcpu)
+{
+	int i = 0, ret, num_hw_ctrs = 0, hpm_width = 0;
+	struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
+	struct kvm_pmc *pmc;
+
+	/*
+	 * PMU functionality should be only available to guests if privilege mode
+	 * filtering is available in the host. Otherwise, guest will always count
+	 * events while the execution is in hypervisor mode.
+	 */
+	if (!riscv_isa_extension_available(NULL, SSCOFPMF))
+		return;
+
+	ret = riscv_pmu_get_hpm_info(&hpm_width, &num_hw_ctrs);
+	if (ret < 0 || !hpm_width || !num_hw_ctrs)
+		return;
+
+	/*
+	 * Increase the number of hardware counters to offset the time counter.
+	 */
+	kvpmu->num_hw_ctrs = num_hw_ctrs + 1;
+	kvpmu->num_fw_ctrs = SBI_PMU_FW_MAX;
+	memset(&kvpmu->fw_event, 0, SBI_PMU_FW_MAX * sizeof(struct kvm_fw_event));
+
+	if (kvpmu->num_hw_ctrs > RISCV_KVM_MAX_HW_CTRS) {
+		pr_warn_once("Limiting the hardware counters to 32 as specified by the ISA");
+		kvpmu->num_hw_ctrs = RISCV_KVM_MAX_HW_CTRS;
+	}
+
+	/*
+	 * There is no correlation between the logical hardware counter and virtual counters.
+	 * However, we need to encode a hpmcounter CSR in the counter info field so that
+	 * KVM can trap n emulate the read. This works well in the migration use case as
+	 * KVM doesn't care if the actual hpmcounter is available in the hardware or not.
+	 */
+	for (i = 0; i < kvm_pmu_num_counters(kvpmu); i++) {
+		/* TIME CSR shouldn't be read from perf interface */
+		if (i == 1)
+			continue;
+		pmc = &kvpmu->pmc[i];
+		pmc->idx = i;
+		pmc->event_idx = SBI_PMU_EVENT_IDX_INVALID;
+		if (i < kvpmu->num_hw_ctrs) {
+			pmc->cinfo.type = SBI_PMU_CTR_TYPE_HW;
+			if (i < 3)
+				/* CY, IR counters */
+				pmc->cinfo.width = 63;
+			else
+				pmc->cinfo.width = hpm_width;
+			/*
+			 * The CSR number doesn't have any relation with the logical
+			 * hardware counters. The CSR numbers are encoded sequentially
+			 * to avoid maintaining a map between the virtual counter
+			 * and CSR number.
+			 */
+			pmc->cinfo.csr = CSR_CYCLE + i;
+		} else {
+			pmc->cinfo.type = SBI_PMU_CTR_TYPE_FW;
+			pmc->cinfo.width = BITS_PER_LONG - 1;
+		}
+	}
+
+	kvpmu->init_done = true;
+}
+
+void kvm_riscv_vcpu_pmu_deinit(struct kvm_vcpu *vcpu)
+{
+	struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
+	struct kvm_pmc *pmc;
+	int i;
+
+	if (!kvpmu)
+		return;
+
+	for_each_set_bit(i, kvpmu->pmc_in_use, RISCV_MAX_COUNTERS) {
+		pmc = &kvpmu->pmc[i];
+		pmc->counter_val = 0;
+		kvm_pmu_release_perf_event(pmc);
+		pmc->event_idx = SBI_PMU_EVENT_IDX_INVALID;
+	}
+	bitmap_zero(kvpmu->pmc_in_use, RISCV_MAX_COUNTERS);
+	memset(&kvpmu->fw_event, 0, SBI_PMU_FW_MAX * sizeof(struct kvm_fw_event));
+}
+
+void kvm_riscv_vcpu_pmu_reset(struct kvm_vcpu *vcpu)
+{
+	kvm_riscv_vcpu_pmu_deinit(vcpu);
+}