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| author | Mark Rutland <mark.rutland@arm.com> | 2022-09-12 17:22:04 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2022-09-16 17:15:02 +0100 |
| commit | 34bbfdfb146be3ad485cbe526b2a1e9ce220649c (patch) | |
| tree | 7333a23b43ef3f0cfee878438b4c3d5760a46175 /arch/arm64/kvm/va_layout.c | |
| parent | 92b4b5619f12770d455ae639ed4e773bdf01aff6 (diff) | |
| download | linux-34bbfdfb146be3ad485cbe526b2a1e9ce220649c.tar.bz2 | |
arm64: alternatives: kvm: prepare for cap changes
The KVM patching callbacks use cpus_have_final_cap() internally within
has_vhe(), and subsequent patches will make it invalid to call
cpus_have_final_cap() before alternatives patching has completed, and
will mean that cpus_have_const_cap() will always fall back to dynamic
checks prior to alternatives patching.
In preparation for said change, this patch modifies the KVM patching
callbacks to use cpus_have_cap() directly. This is not subject to
patching, and will dynamically check the cpu_hwcaps array, which is
functionally equivalent to the existing behaviour.
There should be no functional change as a result of this patch.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: James Morse <james.morse@arm.com>
Cc: Joey Gouly <joey.gouly@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20220912162210.3626215-3-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kvm/va_layout.c')
| -rw-r--r-- | arch/arm64/kvm/va_layout.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c index acdb7b3cc97d..91b22a014610 100644 --- a/arch/arm64/kvm/va_layout.c +++ b/arch/arm64/kvm/va_layout.c @@ -169,7 +169,7 @@ void __init kvm_update_va_mask(struct alt_instr *alt, * dictates it and we don't have any spare bits in the * address), NOP everything after masking the kernel VA. */ - if (has_vhe() || (!tag_val && i > 0)) { + if (cpus_have_cap(ARM64_HAS_VIRT_HOST_EXTN) || (!tag_val && i > 0)) { updptr[i] = cpu_to_le32(aarch64_insn_gen_nop()); continue; } @@ -193,7 +193,8 @@ void kvm_patch_vector_branch(struct alt_instr *alt, BUG_ON(nr_inst != 4); - if (!cpus_have_const_cap(ARM64_SPECTRE_V3A) || WARN_ON_ONCE(has_vhe())) + if (!cpus_have_cap(ARM64_SPECTRE_V3A) || + WARN_ON_ONCE(cpus_have_cap(ARM64_HAS_VIRT_HOST_EXTN))) return; /* |