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| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2021-04-05 17:42:54 +0100 |
|---|---|---|
| committer | Mathieu Poirier <mathieu.poirier@linaro.org> | 2021-04-06 16:05:28 -0600 |
| commit | a1319260bf62951e279ea228f682bf4b8834a3c2 (patch) | |
| tree | 856ce34e19e6189e4e931e6f58ec2df84dec1f13 /arch/arm64/kvm/debug.c | |
| parent | d2602bb4f5a450642b96d467e27e6d5d3ef7fa54 (diff) | |
| download | linux-a1319260bf62951e279ea228f682bf4b8834a3c2.tar.gz linux-a1319260bf62951e279ea228f682bf4b8834a3c2.tar.bz2 linux-a1319260bf62951e279ea228f682bf4b8834a3c2.zip | |
arm64: KVM: Enable access to TRBE support for host
For a nvhe host, the EL2 must allow the EL1&0 translation
regime for TraceBuffer (MDCR_EL2.E2TB == 0b11). This must
be saved/restored over a trip to the guest. Also, before
entering the guest, we must flush any trace data if the
TRBE was enabled. And we must prohibit the generation
of trace while we are in EL1 by clearing the TRFCR_EL1.
For vhe, the EL2 must prevent the EL1 access to the Trace
Buffer.
The MDCR_EL2 bit definitions for TRBE are available here :
https://developer.arm.com/documentation/ddi0601/2020-12/AArch64-Registers/
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210405164307.1720226-8-suzuki.poulose@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Diffstat (limited to 'arch/arm64/kvm/debug.c')
| -rw-r--r-- | arch/arm64/kvm/debug.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c index b6d2c33ad1df..6f992c696911 100644 --- a/arch/arm64/kvm/debug.c +++ b/arch/arm64/kvm/debug.c @@ -89,7 +89,7 @@ void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) * - Debug ROM Address (MDCR_EL2_TDRA) * - OS related registers (MDCR_EL2_TDOSA) * - Statistical profiler (MDCR_EL2_TPMS/MDCR_EL2_E2PB) - * - Self-hosted Trace Filter controls (MDCR_EL2_TTRF) + * - Self-hosted Trace (MDCR_EL2_TTRF/MDCR_EL2_E2TB) * * Additionally, KVM only traps guest accesses to the debug registers if * the guest is not actively using them (see the KVM_ARM64_DEBUG_DIRTY @@ -107,8 +107,8 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) trace_kvm_arm_setup_debug(vcpu, vcpu->guest_debug); /* - * This also clears MDCR_EL2_E2PB_MASK to disable guest access - * to the profiling buffer. + * This also clears MDCR_EL2_E2PB_MASK and MDCR_EL2_E2TB_MASK + * to disable guest access to the profiling and trace buffers */ vcpu->arch.mdcr_el2 = __this_cpu_read(mdcr_el2) & MDCR_EL2_HPMN_MASK; vcpu->arch.mdcr_el2 |= (MDCR_EL2_TPM | @@ -248,9 +248,15 @@ void kvm_arch_vcpu_load_debug_state_flags(struct kvm_vcpu *vcpu) if (cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_PMSVER_SHIFT) && !(read_sysreg_s(SYS_PMBIDR_EL1) & BIT(SYS_PMBIDR_EL1_P_SHIFT))) vcpu->arch.flags |= KVM_ARM64_DEBUG_STATE_SAVE_SPE; + + /* Check if we have TRBE implemented and available at the host */ + if (cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_TRBE_SHIFT) && + !(read_sysreg_s(SYS_TRBIDR_EL1) & TRBIDR_PROG)) + vcpu->arch.flags |= KVM_ARM64_DEBUG_STATE_SAVE_TRBE; } void kvm_arch_vcpu_put_debug_state_flags(struct kvm_vcpu *vcpu) { - vcpu->arch.flags &= ~KVM_ARM64_DEBUG_STATE_SAVE_SPE; + vcpu->arch.flags &= ~(KVM_ARM64_DEBUG_STATE_SAVE_SPE | + KVM_ARM64_DEBUG_STATE_SAVE_TRBE); } |