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| author | Marc Zyngier <maz@kernel.org> | 2021-03-05 21:52:51 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-03-06 12:18:40 +0300 |
| commit | f27647b588c13647a60074b5a8dd39a86d919a1d (patch) | |
| tree | 99a47bf8bf42dc6994eb98191dc0dd4dbbff080b /arch/arm64/kernel/image-vars.h | |
| parent | 6b5b368fccd7109b052e45af8ba1464c8d140a49 (diff) | |
| download | linux-f27647b588c13647a60074b5a8dd39a86d919a1d.tar.xz | |
KVM: arm64: Don't access PMSELR_EL0/PMUSERENR_EL0 when no PMU is available
When running under a nesting hypervisor, it isn't guaranteed that
the virtual HW will include a PMU. In which case, let's not try
to access the PMU registers in the world switch, as that'd be
deadly.
Reported-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Link: https://lore.kernel.org/r/20210209114844.3278746-3-maz@kernel.org
Message-Id: <20210305185254.3730990-6-maz@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/arm64/kernel/image-vars.h')
| -rw-r--r-- | arch/arm64/kernel/image-vars.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 23f1a557bd9f..5aa9ed1e9ec6 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -101,6 +101,9 @@ KVM_NVHE_ALIAS(__stop___kvm_ex_table); /* Array containing bases of nVHE per-CPU memory regions. */ KVM_NVHE_ALIAS(kvm_arm_hyp_percpu_base); +/* PMU available static key */ +KVM_NVHE_ALIAS(kvm_arm_pmu_available); + #endif /* CONFIG_KVM */ #endif /* __ARM64_KERNEL_IMAGE_VARS_H */ |