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

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commit 4b661d6133c5d3a7c9aca0b4ee5a78c7766eff3f upstream.

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 <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Change-Id: Ic7358a5cc152dce9d72e5a08085748a1dfc2f903
(cherry picked from commit 4b661d6133c5d3a7c9aca0b4ee5a78c7766eff3f)
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Marc Zyngier 2020-07-06 17:38:01 +01:00 • committed by Greg Kroah-Hartman
commit 6f5211c079
1 changed files with 8 additions and 0 deletions
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8
drivers/clocksource/arm_arch_timer.c
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@ -476,6 +476,14 @@ 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 *,