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2d7921c499
VMware exposes the following Pseudo PMCs: 0x10000: Physical host TSC 0x10001: Elapsed real time in ns 0x10002: Elapsed apparent time in ns For more info refer to: https://www.vmware.com/files/pdf/techpaper/Timekeeping-In-VirtualMachines.pdf VMware allows access to these Pseduo-PMCs even when read via RDPMC in Ring3 and CR4.PCE=0. Therefore, commit modifies x86 emulator to allow access to these PMCs in this situation. In addition, emulation of these PMCs were added to kvm_pmu_rdpmc(). Signed-off-by: Arbel Moshe <arbel.moshe@oracle.com> Signed-off-by: Liran Alon <liran.alon@oracle.com> Reviewed-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __KVM_X86_PMU_H
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#define __KVM_X86_PMU_H
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#define vcpu_to_pmu(vcpu) (&(vcpu)->arch.pmu)
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#define pmu_to_vcpu(pmu) (container_of((pmu), struct kvm_vcpu, arch.pmu))
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#define pmc_to_pmu(pmc) (&(pmc)->vcpu->arch.pmu)
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/* retrieve the 4 bits for EN and PMI out of IA32_FIXED_CTR_CTRL */
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#define fixed_ctrl_field(ctrl_reg, idx) (((ctrl_reg) >> ((idx)*4)) & 0xf)
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#define VMWARE_BACKDOOR_PMC_HOST_TSC 0x10000
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#define VMWARE_BACKDOOR_PMC_REAL_TIME 0x10001
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#define VMWARE_BACKDOOR_PMC_APPARENT_TIME 0x10002
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struct kvm_event_hw_type_mapping {
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u8 eventsel;
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u8 unit_mask;
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unsigned event_type;
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};
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struct kvm_pmu_ops {
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unsigned (*find_arch_event)(struct kvm_pmu *pmu, u8 event_select,
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u8 unit_mask);
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unsigned (*find_fixed_event)(int idx);
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bool (*pmc_is_enabled)(struct kvm_pmc *pmc);
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struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx);
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struct kvm_pmc *(*msr_idx_to_pmc)(struct kvm_vcpu *vcpu, unsigned idx);
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int (*is_valid_msr_idx)(struct kvm_vcpu *vcpu, unsigned idx);
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bool (*is_valid_msr)(struct kvm_vcpu *vcpu, u32 msr);
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int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
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int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
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void (*refresh)(struct kvm_vcpu *vcpu);
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void (*init)(struct kvm_vcpu *vcpu);
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void (*reset)(struct kvm_vcpu *vcpu);
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};
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static inline u64 pmc_bitmask(struct kvm_pmc *pmc)
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{
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struct kvm_pmu *pmu = pmc_to_pmu(pmc);
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return pmu->counter_bitmask[pmc->type];
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}
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static inline u64 pmc_read_counter(struct kvm_pmc *pmc)
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{
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u64 counter, enabled, running;
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counter = pmc->counter;
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if (pmc->perf_event)
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counter += perf_event_read_value(pmc->perf_event,
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&enabled, &running);
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/* FIXME: Scaling needed? */
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return counter & pmc_bitmask(pmc);
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}
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static inline void pmc_stop_counter(struct kvm_pmc *pmc)
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{
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if (pmc->perf_event) {
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pmc->counter = pmc_read_counter(pmc);
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perf_event_release_kernel(pmc->perf_event);
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pmc->perf_event = NULL;
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}
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}
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static inline bool pmc_is_gp(struct kvm_pmc *pmc)
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{
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return pmc->type == KVM_PMC_GP;
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}
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static inline bool pmc_is_fixed(struct kvm_pmc *pmc)
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{
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return pmc->type == KVM_PMC_FIXED;
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}
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static inline bool pmc_is_enabled(struct kvm_pmc *pmc)
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{
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return kvm_x86_ops->pmu_ops->pmc_is_enabled(pmc);
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}
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/* returns general purpose PMC with the specified MSR. Note that it can be
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* used for both PERFCTRn and EVNTSELn; that is why it accepts base as a
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* paramenter to tell them apart.
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*/
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static inline struct kvm_pmc *get_gp_pmc(struct kvm_pmu *pmu, u32 msr,
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u32 base)
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{
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if (msr >= base && msr < base + pmu->nr_arch_gp_counters)
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return &pmu->gp_counters[msr - base];
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return NULL;
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}
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/* returns fixed PMC with the specified MSR */
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static inline struct kvm_pmc *get_fixed_pmc(struct kvm_pmu *pmu, u32 msr)
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{
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int base = MSR_CORE_PERF_FIXED_CTR0;
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if (msr >= base && msr < base + pmu->nr_arch_fixed_counters)
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return &pmu->fixed_counters[msr - base];
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return NULL;
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}
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void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel);
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void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx);
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void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx);
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void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu);
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void kvm_pmu_handle_event(struct kvm_vcpu *vcpu);
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int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data);
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int kvm_pmu_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned idx);
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bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr);
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int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
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int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
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void kvm_pmu_refresh(struct kvm_vcpu *vcpu);
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void kvm_pmu_reset(struct kvm_vcpu *vcpu);
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void kvm_pmu_init(struct kvm_vcpu *vcpu);
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void kvm_pmu_destroy(struct kvm_vcpu *vcpu);
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bool is_vmware_backdoor_pmc(u32 pmc_idx);
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extern struct kvm_pmu_ops intel_pmu_ops;
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extern struct kvm_pmu_ops amd_pmu_ops;
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#endif /* __KVM_X86_PMU_H */
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