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| author | James Morse <james.morse@arm.com> | 2021-12-10 15:32:56 +0100 |
|---|---|---|
| committer | James Morse <james.morse@arm.com> | 2022-02-24 15:02:44 +0100 |
| commit | 228a26b912287934789023b4132ba76065d9491c (patch) | |
| tree | 67a41ff4b1f85a9f72239a7f213d1ff2279af0ac /arch/arm64/kernel/image-vars.h | |
| parent | KVM: arm64: Allow SMCCC_ARCH_WORKAROUND_3 to be discovered and migrated (diff) | |
| download | linux-228a26b912287934789023b4132ba76065d9491c.tar.xz linux-228a26b912287934789023b4132ba76065d9491c.zip | |
arm64: Use the clearbhb instruction in mitigations
Future CPUs may implement a clearbhb instruction that is sufficient
to mitigate SpectreBHB. CPUs that implement this instruction, but
not CSV2.3 must be affected by Spectre-BHB.
Add support to use this instruction as the BHB mitigation on CPUs
that support it. The instruction is in the hint space, so it will
be treated by a NOP as older CPUs.
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Diffstat (limited to 'arch/arm64/kernel/image-vars.h')
| -rw-r--r-- | arch/arm64/kernel/image-vars.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 56db964a4f0c..55a1ced8eb77 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -69,6 +69,7 @@ KVM_NVHE_ALIAS(kvm_compute_final_ctr_el0); KVM_NVHE_ALIAS(spectre_bhb_patch_loop_iter); KVM_NVHE_ALIAS(spectre_bhb_patch_loop_mitigation_enable); KVM_NVHE_ALIAS(spectre_bhb_patch_wa3); +KVM_NVHE_ALIAS(spectre_bhb_patch_clearbhb); /* Global kernel state accessed by nVHE hyp code. */ KVM_NVHE_ALIAS(kvm_vgic_global_state); |