diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 2 | ||||
| -rw-r--r-- | arch/arm64/kvm/debug.c | 18 |
2 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index fec53d84e990..05931a846e4e 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -1388,6 +1388,7 @@ void kvm_clr_pmu_events(u64 clr); bool kvm_set_pmuserenr(u64 val); void kvm_enable_trbe(void); void kvm_disable_trbe(void); +void kvm_tracing_set_el1_configuration(u64 trfcr_while_in_guest); #else static inline void kvm_set_pmu_events(u64 set, struct perf_event_attr *attr) {} static inline void kvm_clr_pmu_events(u64 clr) {} @@ -1397,6 +1398,7 @@ static inline bool kvm_set_pmuserenr(u64 val) } static inline void kvm_enable_trbe(void) {} static inline void kvm_disable_trbe(void) {} +static inline void kvm_tracing_set_el1_configuration(u64 trfcr_while_in_guest) {} #endif void kvm_vcpu_load_vhe(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c index 92a24adadb0e..0e4c805e7e89 100644 --- a/arch/arm64/kvm/debug.c +++ b/arch/arm64/kvm/debug.c @@ -245,3 +245,21 @@ void kvm_disable_trbe(void) host_data_clear_flag(TRBE_ENABLED); } EXPORT_SYMBOL_GPL(kvm_disable_trbe); + +void kvm_tracing_set_el1_configuration(u64 trfcr_while_in_guest) +{ + if (is_protected_kvm_enabled() || WARN_ON_ONCE(preemptible())) + return; + + if (has_vhe()) { + write_sysreg_s(trfcr_while_in_guest, SYS_TRFCR_EL12); + return; + } + + *host_data_ptr(trfcr_while_in_guest) = trfcr_while_in_guest; + if (read_sysreg_s(SYS_TRFCR_EL1) != trfcr_while_in_guest) + host_data_set_flag(EL1_TRACING_CONFIGURED); + else + host_data_clear_flag(EL1_TRACING_CONFIGURED); +} +EXPORT_SYMBOL_GPL(kvm_tracing_set_el1_configuration); |