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arm64: arch_timer: Disable the compat vdso for cores affected by ARM64_WORKAROUND_1418040

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ARM64_WORKAROUND_1418040 requires that AArch32 EL0 accesses to
the virtual counter register are trapped and emulated by the kernel.
This makes the vdso pretty pointless, and in some cases livelock
prone.

Provide a workaround entry that limits the vdso to 64bit tasks.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200706163802.1836732-4-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marc Zyngier 2020-07-06 17:38:01 +01:00 committed by Will Deacon
parent c1fbec4ac0
commit 4b661d6133
1 changed files with 8 additions and 0 deletions
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drivers/clocksource/arm_arch_timer.c
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@ -480,6 +480,14 @@ static const struct arch_timer_erratum_workaround ool_workarounds[] = {
.set_next_event_virt = erratum_set_next_event_tval_virt,
},
#endif
#ifdef CONFIG_ARM64_ERRATUM_1418040
{
.match_type = ate_match_local_cap_id,
.id = (void *)ARM64_WORKAROUND_1418040,
.desc = "ARM erratum 1418040",
.disable_compat_vdso = true,
},
#endif
};
typedef bool (*ate_match_fn_t)(const struct arch_timer_erratum_workaround *,