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KVM: arm64: Support trace filtering for guests

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For nVHE, switch the filter value in and out if the Coresight driver
asks for it. This will support filters for guests when sinks other than
TRBE are used.

For VHE, just write the filter directly to TRFCR_EL1 where trace can be
used even with TRBE sinks.

Signed-off-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20250106142446.628923-7-james.clark@linaro.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
James Clark
2025-01-06 14:24:41 +00:00
committed by Marc Zyngier
parent a665e3bc88
commit 054b88391b
2 changed files with 20 additions and 0 deletions
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2
arch/arm64/include/asm/kvm_host.h
View File

@@ -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);

18
arch/arm64/kvm/debug.c
View File

@@ -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);