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([2a01:e34:ed2f:f020:6971:b700:3764:fa96]) by smtp.googlemail.com with ESMTPSA id z3sm5815106wrw.87.2020.11.12.03.40.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 Nov 2020 03:40:54 -0800 (PST) Subject: Re: [PATCH v2 05/17] clocksource/hyperv: use MSR-based access if running as root To: Wei Liu Cc: Linux on Hyper-V List , virtualization@lists.linux-foundation.org, Linux Kernel List , Michael Kelley , Vineeth Pillai , Sunil Muthuswamy , Nuno Das Neves , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Thomas Gleixner References: <20201105165814.29233-1-wei.liu@kernel.org> <20201105165814.29233-6-wei.liu@kernel.org> <3527e98a-faab-2360-f521-aa04bbe92edf@linaro.org> <20201112112437.lt3g5bhpjym3evu5@liuwe-devbox-debian-v2> From: Daniel Lezcano Message-ID: <2c5101fb-f3de-7b0c-ee76-e5a0e6b32098@linaro.org> Date: Thu, 12 Nov 2020 12:40:53 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201112112437.lt3g5bhpjym3evu5@liuwe-devbox-debian-v2> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org On 12/11/2020 12:24, Wei Liu wrote: > On Thu, Nov 12, 2020 at 10:56:17AM +0100, Daniel Lezcano wrote: >> On 05/11/2020 17:58, Wei Liu wrote: >>> Signed-off-by: Wei Liu Acked-by: Daniel Lezcano >>> --- >> >> I would like to apply this patch but the changelog is too short (one line). >> >> Please add a small paragraph (no need to resend just answer here, I will >> amend the log myself. > > Please don't apply this to your tree. It is dependent on a previous > patch. I expect this series to go through the hyperv tree. > > I will add in this small paragraph in a later version: > > When Linux runs as the root partition, the setup required for TSC page > is different. Luckily Linux also has access to the MSR based > clocksource. We can just disable the TSC page clocksource if Linux is > the root partition. > > If you're happy with the description, I would love to have an ack from > you. I will funnel the patch via the hyperv tree. > > Wei. > -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog