mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
66bb8a065f
Some events can provide a guest with information about other guests or the host (e.g. L3 cache stats); providing the capability to restrict access to a "safe" set of events would limit the potential for the PMU to be used in any side channel attacks. This change introduces a new VM ioctl that sets an event filter. If the guest attempts to program a counter for any blacklisted or non-whitelisted event, the kernel counter won't be created, so any RDPMC/RDMSR will show 0 instances of that event. Signed-off-by: Eric Hankland <ehankland@google.com> [Lots of changes. All remaining bugs are probably mine. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
127 lines
3.9 KiB
C
127 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __KVM_X86_PMU_H
|
|
#define __KVM_X86_PMU_H
|
|
|
|
#define vcpu_to_pmu(vcpu) (&(vcpu)->arch.pmu)
|
|
#define pmu_to_vcpu(pmu) (container_of((pmu), struct kvm_vcpu, arch.pmu))
|
|
#define pmc_to_pmu(pmc) (&(pmc)->vcpu->arch.pmu)
|
|
|
|
/* retrieve the 4 bits for EN and PMI out of IA32_FIXED_CTR_CTRL */
|
|
#define fixed_ctrl_field(ctrl_reg, idx) (((ctrl_reg) >> ((idx)*4)) & 0xf)
|
|
|
|
#define VMWARE_BACKDOOR_PMC_HOST_TSC 0x10000
|
|
#define VMWARE_BACKDOOR_PMC_REAL_TIME 0x10001
|
|
#define VMWARE_BACKDOOR_PMC_APPARENT_TIME 0x10002
|
|
|
|
struct kvm_event_hw_type_mapping {
|
|
u8 eventsel;
|
|
u8 unit_mask;
|
|
unsigned event_type;
|
|
};
|
|
|
|
struct kvm_pmu_ops {
|
|
unsigned (*find_arch_event)(struct kvm_pmu *pmu, u8 event_select,
|
|
u8 unit_mask);
|
|
unsigned (*find_fixed_event)(int idx);
|
|
bool (*pmc_is_enabled)(struct kvm_pmc *pmc);
|
|
struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx);
|
|
struct kvm_pmc *(*msr_idx_to_pmc)(struct kvm_vcpu *vcpu, unsigned idx,
|
|
u64 *mask);
|
|
int (*is_valid_msr_idx)(struct kvm_vcpu *vcpu, unsigned idx);
|
|
bool (*is_valid_msr)(struct kvm_vcpu *vcpu, u32 msr);
|
|
int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
|
|
int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
|
|
void (*refresh)(struct kvm_vcpu *vcpu);
|
|
void (*init)(struct kvm_vcpu *vcpu);
|
|
void (*reset)(struct kvm_vcpu *vcpu);
|
|
};
|
|
|
|
static inline u64 pmc_bitmask(struct kvm_pmc *pmc)
|
|
{
|
|
struct kvm_pmu *pmu = pmc_to_pmu(pmc);
|
|
|
|
return pmu->counter_bitmask[pmc->type];
|
|
}
|
|
|
|
static inline u64 pmc_read_counter(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 inline void pmc_stop_counter(struct kvm_pmc *pmc)
|
|
{
|
|
if (pmc->perf_event) {
|
|
pmc->counter = pmc_read_counter(pmc);
|
|
perf_event_release_kernel(pmc->perf_event);
|
|
pmc->perf_event = NULL;
|
|
}
|
|
}
|
|
|
|
static inline bool pmc_is_gp(struct kvm_pmc *pmc)
|
|
{
|
|
return pmc->type == KVM_PMC_GP;
|
|
}
|
|
|
|
static inline bool pmc_is_fixed(struct kvm_pmc *pmc)
|
|
{
|
|
return pmc->type == KVM_PMC_FIXED;
|
|
}
|
|
|
|
static inline bool pmc_is_enabled(struct kvm_pmc *pmc)
|
|
{
|
|
return kvm_x86_ops->pmu_ops->pmc_is_enabled(pmc);
|
|
}
|
|
|
|
/* returns general purpose PMC with the specified MSR. Note that it can be
|
|
* used for both PERFCTRn and EVNTSELn; that is why it accepts base as a
|
|
* paramenter to tell them apart.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/* returns fixed PMC with the specified MSR */
|
|
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;
|
|
}
|
|
|
|
void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel);
|
|
void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx);
|
|
void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx);
|
|
|
|
void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu);
|
|
void kvm_pmu_handle_event(struct kvm_vcpu *vcpu);
|
|
int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data);
|
|
int kvm_pmu_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned idx);
|
|
bool kvm_pmu_is_valid_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, struct msr_data *msr_info);
|
|
void kvm_pmu_refresh(struct kvm_vcpu *vcpu);
|
|
void kvm_pmu_reset(struct kvm_vcpu *vcpu);
|
|
void kvm_pmu_init(struct kvm_vcpu *vcpu);
|
|
void kvm_pmu_destroy(struct kvm_vcpu *vcpu);
|
|
int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp);
|
|
|
|
bool is_vmware_backdoor_pmc(u32 pmc_idx);
|
|
|
|
extern struct kvm_pmu_ops intel_pmu_ops;
|
|
extern struct kvm_pmu_ops amd_pmu_ops;
|
|
#endif /* __KVM_X86_PMU_H */
|