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| author |   Mark Rutland <mark.rutland@arm.com> | 2022-09-12 17:22:08 +0100 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2022-09-16 17:15:03 +0100 |
| commit | 4c0bd995d73ed8897650095c7892b132a0bd66a4 (patch) | |
| tree | 554558e8ad1ab0797b279f93875bd490b84ccd7f /arch/arm64/kernel/entry.S | |
| parent | arm64: alternatives: make alt_region const (diff) | |
| download | wireguard-linux-4c0bd995d73ed8897650095c7892b132a0bd66a4.tar.xz wireguard-linux-4c0bd995d73ed8897650095c7892b132a0bd66a4.zip | |
arm64: alternatives: have callbacks take a cap
Today, callback alternatives are special-cased within
__apply_alternatives(), and are applied alongside patching for system
capabilities as ARM64_NCAPS is not part of the boot_capabilities feature
mask.
This special-casing is less than ideal. Giving special meaning to
ARM64_NCAPS for this requires some structures and loops to use
ARM64_NCAPS + 1 (AKA ARM64_NPATCHABLE), while others use ARM64_NCAPS.
It's also not immediately clear callback alternatives are only applied
when applying alternatives for system-wide features.
To make this a bit clearer, changes the way that callback alternatives
are identified to remove the special-casing of ARM64_NCAPS, and to allow
callback alternatives to be associated with a cpucap as with all other
alternatives.
New cpucaps, ARM64_ALWAYS_BOOT and ARM64_ALWAYS_SYSTEM are added which
are always detected alongside boot cpu capabilities and system
capabilities respectively. All existing callback alternatives are made
to use ARM64_ALWAYS_SYSTEM, and so will be patched at the same point
during the boot flow as before.
Subsequent patches will make more use of these new cpucaps.
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/20220912162210.3626215-7-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/entry.S')
| -rw-r--r-- | arch/arm64/kernel/entry.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 2d73b3e793b2..e28137d64b76 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -114,7 +114,7 @@ * them if required. */ .macro apply_ssbd, state, tmp1, tmp2 -alternative_cb spectre_v4_patch_fw_mitigation_enable +alternative_cb ARM64_ALWAYS_SYSTEM, spectre_v4_patch_fw_mitigation_enable b .L__asm_ssbd_skip\@ // Patched to NOP alternative_cb_end ldr_this_cpu \tmp2, arm64_ssbd_callback_required, \tmp1 @@ -123,7 +123,7 @@ alternative_cb_end tbnz \tmp2, #TIF_SSBD, .L__asm_ssbd_skip\@ mov w0, #ARM_SMCCC_ARCH_WORKAROUND_2 mov w1, #\state -alternative_cb smccc_patch_fw_mitigation_conduit +alternative_cb ARM64_ALWAYS_SYSTEM, smccc_patch_fw_mitigation_conduit nop // Patched to SMC/HVC #0 alternative_cb_end .L__asm_ssbd_skip\@: @@ -175,7 +175,7 @@ alternative_else_nop_endif .macro mte_set_kernel_gcr, tmp, tmp2 #ifdef CONFIG_KASAN_HW_TAGS -alternative_cb kasan_hw_tags_enable +alternative_cb ARM64_ALWAYS_SYSTEM, kasan_hw_tags_enable b 1f alternative_cb_end mov \tmp, KERNEL_GCR_EL1 @@ -186,7 +186,7 @@ alternative_cb_end .macro mte_set_user_gcr, tsk, tmp, tmp2 #ifdef CONFIG_KASAN_HW_TAGS -alternative_cb kasan_hw_tags_enable +alternative_cb ARM64_ALWAYS_SYSTEM, kasan_hw_tags_enable b 1f alternative_cb_end ldr \tmp, [\tsk, #THREAD_MTE_CTRL] |