From: Marc Zyngier <maz@kernel.org>
To: Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, kernel-team@android.com,
stable@vger.kernel.org
Subject: [PATCH v2 3/4] arm64: arch_timer: Disable the compat vdso for cores affected by ARM64_WORKAROUND_1418040
Date: Mon, 6 Jul 2020 17:38:01 +0100 [thread overview]
Message-ID: <20200706163802.1836732-4-maz@kernel.org> (raw)
In-Reply-To: <20200706163802.1836732-1-maz@kernel.org>
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.
Cc: stable@vger.kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
drivers/clocksource/arm_arch_timer.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index a8e4fb429f52..6c3e84180146 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -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 *,
--
2.27.0
next prev parent reply other threads:[~2020-07-06 16:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-06 16:37 [PATCH v2 0/4] arm64: Allow the compat vdso to be disabled at runtime Marc Zyngier
2020-07-06 16:37 ` [PATCH v2 1/4] arm64: Introduce a way to disable the 32bit vdso Marc Zyngier
2020-07-06 16:38 ` [PATCH v2 2/4] arm64: arch_timer: Allow an workaround descriptor to disable compat vdso Marc Zyngier
2020-07-06 16:55 ` Mark Rutland
2020-07-06 16:38 ` Marc Zyngier [this message]
2020-07-06 16:57 ` [PATCH v2 3/4] arm64: arch_timer: Disable the compat vdso for cores affected by ARM64_WORKAROUND_1418040 Mark Rutland
2020-07-06 16:38 ` [PATCH v2 4/4] arm64: Rework ARM_ERRATUM_1414080 handling Marc Zyngier
2020-07-06 17:12 ` Mark Rutland
2020-07-08 22:02 ` [PATCH v2 0/4] arm64: Allow the compat vdso to be disabled at runtime Will Deacon
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