From: Dave Hansen <dave.hansen@intel.com>
To: Kohei Tarumizu <tarumizu.kohei@fujitsu.com>,
catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
x86@kernel.org, hpa@zytor.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, fenghua.yu@intel.com,
reinette.chatre@intel.com
Subject: Re: [PATCH v3 6/9] x86: resctrl: pseudo_lock: Fix to restore to original value when re-enabling hardware prefetch register
Date: Wed, 20 Apr 2022 13:56:07 -0700 [thread overview]
Message-ID: <2eb705cd-8607-4b8c-2c0b-31265d503eed@intel.com> (raw)
In-Reply-To: <20220420030223.689259-7-tarumizu.kohei@fujitsu.com>
On 4/19/22 20:02, Kohei Tarumizu wrote:
> The current pseudo_lock.c code overwrittes the value of the
> MSR_MISC_FEATURE_CONTROL to 0 even if the original value is not 0.
> Therefore, modify it to save and restore the original values.
It would be nice to mention that the wrmsr()'s in this patch are only
done inside of an interrupt-disabled region. Without that little tidbit
of information, it's not obviously correct that the smp_call_function()
in patch 8/9 is correct.
The x86 code here looks reasonable otherwise. It's a little bit of a
shame that this is *ONLY* for BROADWELL_X for now, but I assume you were
just conservative about it because that's all you have to test on.
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next prev parent reply other threads:[~2022-04-20 20:57 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-20 3:02 [PATCH v3 0/9] Add hardware prefetch control driver for A64FX and x86 Kohei Tarumizu
2022-04-20 3:02 ` [PATCH v3 1/9] drivers: base: Add hardware prefetch control core driver Kohei Tarumizu
2022-04-20 21:40 ` Thomas Gleixner
2022-04-22 12:10 ` tarumizu.kohei
2022-04-21 6:18 ` Greg KH
2022-04-22 12:30 ` tarumizu.kohei
2022-04-20 3:02 ` [PATCH v3 2/9] drivers: base: Add Kconfig/Makefile to build " Kohei Tarumizu
2022-04-20 3:02 ` [PATCH v3 3/9] soc: fujitsu: Add hardware prefetch control support for A64FX Kohei Tarumizu
2022-04-20 3:02 ` [PATCH v3 4/9] soc: fujitsu: Add Kconfig/Makefile to build hardware prefetch control driver Kohei Tarumizu
2022-04-20 22:14 ` Thomas Gleixner
2022-04-20 3:02 ` [PATCH v3 5/9] arm64: Create cache sysfs directory without ACPI PPTT for hardware prefetch control Kohei Tarumizu
2022-04-20 3:02 ` [PATCH v3 6/9] x86: resctrl: pseudo_lock: Fix to restore to original value when re-enabling hardware prefetch register Kohei Tarumizu
2022-04-20 20:56 ` Dave Hansen [this message]
2022-04-22 12:01 ` tarumizu.kohei
2022-04-25 23:17 ` Reinette Chatre
2022-04-27 2:51 ` tarumizu.kohei
2022-04-20 3:02 ` [PATCH v3 7/9] x86: Add hardware prefetch control support for x86 Kohei Tarumizu
2022-04-20 22:27 ` Thomas Gleixner
2022-04-22 12:16 ` tarumizu.kohei
2022-04-20 3:02 ` [PATCH v3 8/9] x86: Add Kconfig/Makefile to build hardware prefetch control driver Kohei Tarumizu
2022-04-20 3:02 ` [PATCH v3 9/9] docs: ABI: Add sysfs documentation interface of " Kohei Tarumizu
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