diff options
Diffstat (limited to 'arch/arm64/kvm/pmu.c')
-rw-r--r-- | arch/arm64/kvm/pmu.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/arm64/kvm/pmu.c b/arch/arm64/kvm/pmu.c index 5414b134f99a..599e6d3f692e 100644 --- a/arch/arm64/kvm/pmu.c +++ b/arch/arm64/kvm/pmu.c @@ -5,6 +5,7 @@ */ #include <linux/kvm_host.h> #include <linux/perf_event.h> +#include <asm/kvm_hyp.h> /* * Given the exclude_{host,guest} attributes, determine if we are going @@ -43,3 +44,41 @@ void kvm_clr_pmu_events(u32 clr) ctx->pmu_events.events_host &= ~clr; ctx->pmu_events.events_guest &= ~clr; } + +/** + * Disable host events, enable guest events + */ +bool __hyp_text __pmu_switch_to_guest(struct kvm_cpu_context *host_ctxt) +{ + struct kvm_host_data *host; + struct kvm_pmu_events *pmu; + + host = container_of(host_ctxt, struct kvm_host_data, host_ctxt); + pmu = &host->pmu_events; + + if (pmu->events_host) + write_sysreg(pmu->events_host, pmcntenclr_el0); + + if (pmu->events_guest) + write_sysreg(pmu->events_guest, pmcntenset_el0); + + return (pmu->events_host || pmu->events_guest); +} + +/** + * Disable guest events, enable host events + */ +void __hyp_text __pmu_switch_to_host(struct kvm_cpu_context *host_ctxt) +{ + struct kvm_host_data *host; + struct kvm_pmu_events *pmu; + + host = container_of(host_ctxt, struct kvm_host_data, host_ctxt); + pmu = &host->pmu_events; + + if (pmu->events_guest) + write_sysreg(pmu->events_guest, pmcntenclr_el0); + + if (pmu->events_host) + write_sysreg(pmu->events_host, pmcntenset_el0); +} |