From: Marc Zyngier <marc.zyngier@arm.com>
To: Will Deacon <will.deacon@arm.com>, Mark Rutland <mark.rutland@arm.com>
Cc: Itaru Kitayama <itaru.kitayama@riken.jp>,
Catalin Marinas <catalin.marinas@arm.com>,
Hoan Tran <hotran@apm.com>,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, Tai Tri Nguyen <ttnguyen@apm.com>
Subject: [PATCH 0/2] arm64: PMU: Sanitize usage of PMSELR_EL0.SEL
Date: Fri, 2 Dec 2016 15:50:57 +0000 [thread overview]
Message-ID: <1480693859-27249-1-git-send-email-marc.zyngier@arm.com> (raw)
An ugly interaction between the use of PMSELR_EL0 in a host kernel and
the use of PMXEVCNTR_EL0 in a guest has recently come to light [1],
leading to the guest taking an UNDEF exception in EL1 when using the
PMU.
The fix is pretty simple ("don't do that!"), making the PMU useable on
X-Gene, which seems to have a stricter (but nonetheless valid)
interpretation of the architecture.
Patches against 4.9-rc6.
[1] https://lists.cs.columbia.edu/pipermail/kvmarm/2016-November/022545.html
Marc Zyngier (2):
arm64: PMU: Do not use PMSELR_EL0 to access PMCCFILTR_EL0
arm64: PMU: Reset PMSELR_EL0 to a sane value at boot time
arch/arm64/kernel/perf_event.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
--
2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: marc.zyngier@arm.com (Marc Zyngier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/2] arm64: PMU: Sanitize usage of PMSELR_EL0.SEL
Date: Fri, 2 Dec 2016 15:50:57 +0000 [thread overview]
Message-ID: <1480693859-27249-1-git-send-email-marc.zyngier@arm.com> (raw)
An ugly interaction between the use of PMSELR_EL0 in a host kernel and
the use of PMXEVCNTR_EL0 in a guest has recently come to light [1],
leading to the guest taking an UNDEF exception in EL1 when using the
PMU.
The fix is pretty simple ("don't do that!"), making the PMU useable on
X-Gene, which seems to have a stricter (but nonetheless valid)
interpretation of the architecture.
Patches against 4.9-rc6.
[1] https://lists.cs.columbia.edu/pipermail/kvmarm/2016-November/022545.html
Marc Zyngier (2):
arm64: PMU: Do not use PMSELR_EL0 to access PMCCFILTR_EL0
arm64: PMU: Reset PMSELR_EL0 to a sane value at boot time
arch/arm64/kernel/perf_event.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
--
2.1.4
next reply other threads:[~2016-12-02 15:50 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-02 15:50 Marc Zyngier [this message]
2016-12-02 15:50 ` [PATCH 0/2] arm64: PMU: Sanitize usage of PMSELR_EL0.SEL Marc Zyngier
2016-12-02 15:50 ` [PATCH 1/2] arm64: PMU: Do not use PMSELR_EL0 to access PMCCFILTR_EL0 Marc Zyngier
2016-12-02 15:50 ` Marc Zyngier
2016-12-06 13:50 ` Will Deacon
2016-12-06 13:50 ` Will Deacon
2016-12-06 14:32 ` Marc Zyngier
2016-12-06 14:32 ` Marc Zyngier
2016-12-02 15:50 ` [PATCH 2/2] arm64: PMU: Reset PMSELR_EL0 to a sane value at boot time Marc Zyngier
2016-12-02 15:50 ` Marc Zyngier
2016-12-02 21:28 ` [PATCH 0/2] arm64: PMU: Sanitize usage of PMSELR_EL0.SEL Itaru Kitayama
2016-12-02 21:28 ` Itaru Kitayama
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