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linux/include/kvm/arm_pmu.h
Oliver Upton 123f42f0ad Merge branch kvm-arm64/pmu_pmcr_n into kvmarm/next 
* kvm-arm64/pmu_pmcr_n:
  : User-defined PMC limit, courtesy Raghavendra Rao Ananta
  :
  : Certain VMMs may want to reserve some PMCs for host use while running a
  : KVM guest. This was a bit difficult before, as KVM advertised all
  : supported counters to the guest. Userspace can now limit the number of
  : advertised PMCs by writing to PMCR_EL0.N, as KVM's sysreg and PMU
  : emulation enforce the specified limit for handling guest accesses.
  KVM: selftests: aarch64: vPMU test for validating user accesses
  KVM: selftests: aarch64: vPMU register test for unimplemented counters
  KVM: selftests: aarch64: vPMU register test for implemented counters
  KVM: selftests: aarch64: Introduce vpmu_counter_access test
  tools: Import arm_pmuv3.h
  KVM: arm64: PMU: Allow userspace to limit PMCR_EL0.N for the guest
  KVM: arm64: Sanitize PM{C,I}NTEN{SET,CLR}, PMOVS{SET,CLR} before first run
  KVM: arm64: Add {get,set}_user for PM{C,I}NTEN{SET,CLR}, PMOVS{SET,CLR}
  KVM: arm64: PMU: Set PMCR_EL0.N for vCPU based on the associated PMU
  KVM: arm64: PMU: Add a helper to read a vCPU's PMCR_EL0
  KVM: arm64: Select default PMU in KVM_ARM_VCPU_INIT handler
  KVM: arm64: PMU: Introduce helpers to set the guest's PMU

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
2023-10-30 20:24:19 +00:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2015 Linaro Ltd.
* Author: Shannon Zhao <shannon.zhao@linaro.org>
*/
#ifndef __ASM_ARM_KVM_PMU_H
#define __ASM_ARM_KVM_PMU_H
#include <linux/perf_event.h>
#include <linux/perf/arm_pmuv3.h>
#define ARMV8_PMU_CYCLE_IDX (ARMV8_PMU_MAX_COUNTERS - 1)
#if IS_ENABLED(CONFIG_HW_PERF_EVENTS) && IS_ENABLED(CONFIG_KVM)
struct kvm_pmc {
u8 idx; /* index into the pmu->pmc array */
struct perf_event *perf_event;
};
struct kvm_pmu_events {
u32 events_host;
u32 events_guest;
};
struct kvm_pmu {
struct irq_work overflow_work;
struct kvm_pmu_events events;
struct kvm_pmc pmc[ARMV8_PMU_MAX_COUNTERS];
int irq_num;
bool created;
bool irq_level;
};
struct arm_pmu_entry {
struct list_head entry;
struct arm_pmu *arm_pmu;
};
DECLARE_STATIC_KEY_FALSE(kvm_arm_pmu_available);
static __always_inline bool kvm_arm_support_pmu_v3(void)
{
return static_branch_likely(&kvm_arm_pmu_available);
}
#define kvm_arm_pmu_irq_initialized(v) ((v)->arch.pmu.irq_num >= VGIC_NR_SGIS)
u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx);
void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, u64 select_idx, u64 val);
u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu);
u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1);
void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu);
void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu);
void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu);
void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val);
void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val);
void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu);
void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu);
bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu);
void kvm_pmu_update_run(struct kvm_vcpu *vcpu);
void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val);
void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val);
void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data,
u64 select_idx);
void kvm_vcpu_reload_pmu(struct kvm_vcpu *vcpu);
int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr);
int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr);
int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr);
int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu);
struct kvm_pmu_events *kvm_get_pmu_events(void);
void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu);
void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu);
void kvm_vcpu_pmu_resync_el0(void);
#define kvm_vcpu_has_pmu(vcpu) \
(vcpu_has_feature(vcpu, KVM_ARM_VCPU_PMU_V3))
/*
* Updates the vcpu's view of the pmu events for this cpu.
* Must be called before every vcpu run after disabling interrupts, to ensure
* that an interrupt cannot fire and update the structure.
*/
#define kvm_pmu_update_vcpu_events(vcpu) \
do { \
if (!has_vhe() && kvm_vcpu_has_pmu(vcpu)) \
vcpu->arch.pmu.events = *kvm_get_pmu_events(); \
} while (0)
/*
* Evaluates as true when emulating PMUv3p5, and false otherwise.
*/
#define kvm_pmu_is_3p5(vcpu) ({ \
u64 val = IDREG(vcpu->kvm, SYS_ID_AA64DFR0_EL1); \
u8 pmuver = SYS_FIELD_GET(ID_AA64DFR0_EL1, PMUVer, val); \
\
pmuver >= ID_AA64DFR0_EL1_PMUVer_V3P5; \
})
u8 kvm_arm_pmu_get_pmuver_limit(void);
u64 kvm_pmu_evtyper_mask(struct kvm *kvm);
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
struct kvm_pmu {
};
static inline bool kvm_arm_support_pmu_v3(void)
{
return false;
}
#define kvm_arm_pmu_irq_initialized(v) (false)
static inline u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu,
u64 select_idx)
{
return 0;
}
static inline void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu,
u64 select_idx, u64 val) {}
static inline u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu)
{
return 0;
}
static inline void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu) {}
static inline void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu) {}
static inline void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu) {}
static inline void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val) {}
static inline void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val) {}
static inline void kvm_pmu_flush_hwstate(struct kvm_vcpu *vcpu) {}
static inline void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu) {}
static inline bool kvm_pmu_should_notify_user(struct kvm_vcpu *vcpu)
{
return false;
}
static inline void kvm_pmu_update_run(struct kvm_vcpu *vcpu) {}
static inline void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val) {}
static inline void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val) {}
static inline void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu,
u64 data, u64 select_idx) {}
static inline int kvm_arm_pmu_v3_set_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
return -ENXIO;
}
static inline int kvm_arm_pmu_v3_get_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
return -ENXIO;
}
static inline int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
return -ENXIO;
}
static inline int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu)
{
return 0;
}
static inline u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1)
{
return 0;
}
#define kvm_vcpu_has_pmu(vcpu) ({ false; })
#define kvm_pmu_is_3p5(vcpu) ({ false; })
static inline void kvm_pmu_update_vcpu_events(struct kvm_vcpu *vcpu) {}
static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {}
static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {}
static inline void kvm_vcpu_reload_pmu(struct kvm_vcpu *vcpu) {}
static inline u8 kvm_arm_pmu_get_pmuver_limit(void)
{
return 0;
}
static inline u64 kvm_pmu_evtyper_mask(struct kvm *kvm)
{
return 0;
}
static inline void kvm_vcpu_pmu_resync_el0(void) {}
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;
}
#endif
#endif
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