From: Wei Liu <wei.liu@kernel.org>
To: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Wei Liu <wei.liu@kernel.org>,
Linux on Hyper-V List <linux-hyperv@vger.kernel.org>,
virtualization@lists.linux-foundation.org,
Linux Kernel List <linux-kernel@vger.kernel.org>,
Michael Kelley <mikelley@microsoft.com>,
Vineeth Pillai <viremana@linux.microsoft.com>,
Sunil Muthuswamy <sunilmut@microsoft.com>,
Nuno Das Neves <nunodasneves@linux.microsoft.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH v5 05/16] clocksource/hyperv: use MSR-based access if running as root
Date: Tue, 26 Jan 2021 15:19:58 +0000 [thread overview]
Message-ID: <20210126151958.anyp2ncjykivsfvn@liuwe-devbox-debian-v2> (raw)
In-Reply-To: <CA+CK2bBTjUWEOrFKi4pYpEe355sve6b7AjKGc7cQRRe3c-DTrQ@mail.gmail.com>
On Wed, Jan 20, 2021 at 11:13:28AM -0500, Pavel Tatashin wrote:
> On Wed, Jan 20, 2021 at 7:01 AM Wei Liu <wei.liu@kernel.org> wrote:
> >
> > When Linux runs as the root partition, the setup required for TSC page
> > is different.
>
> Why would we need a TSC page as a clock source for root partition at
> all? I think the above can be removed.
>
The TSC page is considered superior to MSR-based clock. In the future we
may want to switch back to that TSC page instead.
I think it provides more context than without.
Wei.
> Luckily Linux also has access to the MSR based
> > clocksource. We can just disable the TSC page clocksource if Linux is
> > the root partition.
> >
next prev parent reply other threads:[~2021-01-26 15:21 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-20 12:00 [PATCH v5 00/16] Introducing Linux root partition support for Microsoft Hypervisor Wei Liu
2021-01-20 12:00 ` [PATCH v5 01/16] asm-generic/hyperv: change HV_CPU_POWER_MANAGEMENT to HV_CPU_MANAGEMENT Wei Liu
2021-01-20 15:57 ` Pavel Tatashin
2021-01-26 0:25 ` Michael Kelley
2021-01-20 12:00 ` [PATCH v5 02/16] x86/hyperv: detect if Linux is the root partition Wei Liu
2021-01-20 16:03 ` Pavel Tatashin
2021-01-26 15:06 ` Wei Liu
2021-01-26 0:31 ` Michael Kelley
2021-01-26 15:15 ` Wei Liu
2021-01-26 15:24 ` Wei Liu
2021-01-20 12:00 ` [PATCH v5 03/16] Drivers: hv: vmbus: skip VMBus initialization if Linux is root Wei Liu
2021-01-20 16:06 ` Pavel Tatashin
2021-01-26 0:32 ` Michael Kelley
2021-01-20 12:00 ` [PATCH v5 04/16] iommu/hyperv: don't setup IRQ remapping when running as root Wei Liu
2021-01-20 16:08 ` Pavel Tatashin
2021-01-26 0:33 ` Michael Kelley
2021-01-20 12:00 ` [PATCH v5 05/16] clocksource/hyperv: use MSR-based access if " Wei Liu
2021-01-20 16:13 ` Pavel Tatashin
2021-01-26 15:19 ` Wei Liu [this message]
2021-01-26 0:34 ` Michael Kelley
2021-01-20 12:00 ` [PATCH v5 06/16] x86/hyperv: allocate output arg pages if required Wei Liu
2021-01-20 15:12 ` kernel test robot
2021-01-20 19:44 ` Pavel Tatashin
2021-01-26 0:41 ` Michael Kelley
2021-01-26 18:09 ` Wei Liu
2021-01-20 12:00 ` [PATCH v5 07/16] x86/hyperv: extract partition ID from Microsoft Hypervisor if necessary Wei Liu
2021-01-26 0:48 ` Michael Kelley
2021-02-02 15:03 ` Wei Liu
2021-02-04 16:33 ` Michael Kelley
2021-01-20 12:00 ` [PATCH v5 08/16] x86/hyperv: handling hypercall page setup for root Wei Liu
2021-01-26 0:49 ` Michael Kelley
2021-01-20 12:00 ` [PATCH v5 09/16] x86/hyperv: provide a bunch of helper functions Wei Liu
2021-01-26 1:20 ` Michael Kelley
2021-02-02 16:19 ` Wei Liu
2021-01-20 12:00 ` [PATCH v5 10/16] x86/hyperv: implement and use hv_smp_prepare_cpus Wei Liu
2021-01-26 1:21 ` Michael Kelley
2021-01-20 12:00 ` [PATCH v5 11/16] asm-generic/hyperv: update hv_msi_entry Wei Liu
2021-01-26 1:22 ` Michael Kelley
2021-01-20 12:00 ` [PATCH v5 12/16] asm-generic/hyperv: update hv_interrupt_entry Wei Liu
2021-01-26 1:23 ` Michael Kelley
2021-01-20 12:00 ` [PATCH v5 13/16] asm-generic/hyperv: introduce hv_device_id and auxiliary structures Wei Liu
2021-01-26 1:26 ` Michael Kelley
2021-02-02 17:02 ` Wei Liu
2021-02-03 13:26 ` Wei Liu
2021-02-03 13:49 ` Arnd Bergmann
2021-02-03 14:09 ` Wei Liu
2021-02-04 16:46 ` Michael Kelley
2021-01-20 12:00 ` [PATCH v5 14/16] asm-generic/hyperv: import data structures for mapping device interrupts Wei Liu
2021-01-26 1:27 ` Michael Kelley
2021-01-20 12:00 ` [PATCH v5 15/16] x86/hyperv: implement an MSI domain for root partition Wei Liu
2021-01-27 5:47 ` Michael Kelley
2021-02-02 17:31 ` Wei Liu
2021-02-02 18:15 ` Michael Kelley
2021-02-02 18:16 ` Wei Liu
2021-01-20 12:00 ` [PATCH v5 16/16] iommu/hyperv: setup an IO-APIC IRQ remapping " Wei Liu
2021-01-27 5:47 ` Michael Kelley
2021-02-03 12:47 ` Wei Liu
2021-02-04 16:41 ` Michael Kelley
2021-02-04 16:48 ` Wei Liu
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