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| author | Marc Zyngier <maz@kernel.org> | 2020-09-18 12:25:40 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-09-29 16:08:16 +0100 |
| commit | 29e8910a566aad3ee72f729e45842858d51ced8d (patch) | |
| tree | 24f724d8fc710a804931c0adcbe1418794491e56 /arch/arm64/kernel | |
| parent | c28762070ca651fe7a981b8f31d972c9b7d2c386 (diff) | |
| download | lwn-29e8910a566aad3ee72f729e45842858d51ced8d.tar.gz lwn-29e8910a566aad3ee72f729e45842858d51ced8d.zip | |
KVM: arm64: Simplify handling of ARCH_WORKAROUND_2
Owing to the fact that the host kernel is always mitigated, we can
drastically simplify the WA2 handling by keeping the mitigation
state ON when entering the guest. This means the guest is either
unaffected or not mitigated.
This results in a nice simplification of the mitigation space,
and the removal of a lot of code that was never really used anyway.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/cpu_errata.c | 14 | ||||
| -rw-r--r-- | arch/arm64/kernel/image-vars.h | 2 |
2 files changed, 0 insertions, 16 deletions
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 7fc54c3d4285..7e9caef13db4 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -108,20 +108,6 @@ cpu_enable_trap_ctr_access(const struct arm64_cpu_capabilities *cap) int ssbd_state __read_mostly = ARM64_SSBD_UNKNOWN; -void __init arm64_enable_wa2_handling(struct alt_instr *alt, - __le32 *origptr, __le32 *updptr, - int nr_inst) -{ - BUG_ON(nr_inst != 1); - /* - * Only allow mitigation on EL1 entry/exit and guest - * ARCH_WORKAROUND_2 handling if the SSBD state allows it to - * be flipped. - */ - if (arm64_get_ssbd_state() == ARM64_SSBD_KERNEL) - *updptr = cpu_to_le32(aarch64_insn_gen_nop()); -} - #ifdef CONFIG_ARM64_ERRATUM_1463225 DEFINE_PER_CPU(int, __in_cortex_a76_erratum_1463225_wa); diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 8982b68289b7..d0f3f35dd0d7 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -64,12 +64,10 @@ __efistub__ctype = _ctype; #define KVM_NVHE_ALIAS(sym) __kvm_nvhe_##sym = sym; /* Alternative callbacks for init-time patching of nVHE hyp code. */ -KVM_NVHE_ALIAS(arm64_enable_wa2_handling); KVM_NVHE_ALIAS(kvm_patch_vector_branch); KVM_NVHE_ALIAS(kvm_update_va_mask); /* Global kernel state accessed by nVHE hyp code. */ -KVM_NVHE_ALIAS(arm64_ssbd_callback_required); KVM_NVHE_ALIAS(kvm_host_data); KVM_NVHE_ALIAS(kvm_vgic_global_state); |