From: Michael Kelley via Virtualization <virtualization@lists.linux-foundation.org>
To: Wei Liu <wei.liu@kernel.org>,
Linux on Hyper-V List <linux-hyperv@vger.kernel.org>
Cc: Stephen Hemminger <sthemmin@microsoft.com>,
"pasha.tatashin@soleen.com" <pasha.tatashin@soleen.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Linux Kernel List <linux-kernel@vger.kernel.org>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
Nuno Das Neves <nunodasneves@linux.microsoft.com>,
Sunil Muthuswamy <sunilmut@microsoft.com>,
Vineeth Pillai <viremana@linux.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 00:34:26 +0000 [thread overview]
Message-ID: <MWHPR21MB159358DEBC6EA386763B788FD7BC9@MWHPR21MB1593.namprd21.prod.outlook.com> (raw)
In-Reply-To: <20210120120058.29138-6-wei.liu@kernel.org>
From: Wei Liu <wei.liu@kernel.org> Sent: Wednesday, January 20, 2021 4:01 AM
>
> 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.
>
> Signed-off-by: Wei Liu <wei.liu@kernel.org>
> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> ---
> drivers/clocksource/hyperv_timer.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
> index ba04cb381cd3..269a691bd2c4 100644
> --- a/drivers/clocksource/hyperv_timer.c
> +++ b/drivers/clocksource/hyperv_timer.c
> @@ -426,6 +426,9 @@ static bool __init hv_init_tsc_clocksource(void)
> if (!(ms_hyperv.features & HV_MSR_REFERENCE_TSC_AVAILABLE))
> return false;
>
> + if (hv_root_partition)
> + return false;
> +
> hv_read_reference_counter = read_hv_clock_tsc;
> phys_addr = virt_to_phys(hv_get_tsc_page());
>
> --
> 2.20.1
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next prev parent reply other threads:[~2021-01-26 0:34 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210120120058.29138-1-wei.liu@kernel.org>
[not found] ` <20210120120058.29138-3-wei.liu@kernel.org>
2021-01-20 16:03 ` [PATCH v5 02/16] x86/hyperv: detect if Linux is the root partition Pavel Tatashin
2021-01-26 0:31 ` Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-7-wei.liu@kernel.org>
2021-01-20 15:12 ` [PATCH v5 06/16] x86/hyperv: allocate output arg pages if required kernel test robot
2021-01-20 19:44 ` Pavel Tatashin
2021-01-26 0:41 ` Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-2-wei.liu@kernel.org>
2021-01-20 15:57 ` [PATCH v5 01/16] asm-generic/hyperv: change HV_CPU_POWER_MANAGEMENT to HV_CPU_MANAGEMENT Pavel Tatashin
2021-01-26 0:25 ` Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-4-wei.liu@kernel.org>
2021-01-20 16:06 ` [PATCH v5 03/16] Drivers: hv: vmbus: skip VMBus initialization if Linux is root Pavel Tatashin
2021-01-26 0:32 ` Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-5-wei.liu@kernel.org>
2021-01-20 16:08 ` [PATCH v5 04/16] iommu/hyperv: don't setup IRQ remapping when running as root Pavel Tatashin
2021-01-26 0:33 ` Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-6-wei.liu@kernel.org>
2021-01-20 16:13 ` [PATCH v5 05/16] clocksource/hyperv: use MSR-based access if " Pavel Tatashin
2021-01-26 0:34 ` Michael Kelley via Virtualization [this message]
[not found] ` <20210120120058.29138-8-wei.liu@kernel.org>
2021-01-26 0:48 ` [PATCH v5 07/16] x86/hyperv: extract partition ID from Microsoft Hypervisor if necessary Michael Kelley via Virtualization
[not found] ` <20210202150353.6npksy7tobrvfqlt@liuwe-devbox-debian-v2>
2021-02-04 16:33 ` Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-9-wei.liu@kernel.org>
2021-01-26 0:49 ` [PATCH v5 08/16] x86/hyperv: handling hypercall page setup for root Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-10-wei.liu@kernel.org>
2021-01-26 1:20 ` [PATCH v5 09/16] x86/hyperv: provide a bunch of helper functions Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-11-wei.liu@kernel.org>
2021-01-26 1:21 ` [PATCH v5 10/16] x86/hyperv: implement and use hv_smp_prepare_cpus Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-12-wei.liu@kernel.org>
2021-01-26 1:22 ` [PATCH v5 11/16] asm-generic/hyperv: update hv_msi_entry Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-13-wei.liu@kernel.org>
2021-01-26 1:23 ` [PATCH v5 12/16] asm-generic/hyperv: update hv_interrupt_entry Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-14-wei.liu@kernel.org>
2021-01-26 1:26 ` [PATCH v5 13/16] asm-generic/hyperv: introduce hv_device_id and auxiliary structures Michael Kelley via Virtualization
[not found] ` <20210202170248.4hds554cyxpuayqc@liuwe-devbox-debian-v2>
[not found] ` <20210203132601.ftpwgs57qtok47cg@liuwe-devbox-debian-v2>
[not found] ` <CAK8P3a0m8jEij-RdP1PTcNcJW2+mXQ1dA4=s+JLXhnv+NyFiHw@mail.gmail.com>
[not found] ` <20210203140906.g35zr7366hh7p5f3@liuwe-devbox-debian-v2>
2021-02-04 16:46 ` Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-15-wei.liu@kernel.org>
2021-01-26 1:27 ` [PATCH v5 14/16] asm-generic/hyperv: import data structures for mapping device interrupts Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-16-wei.liu@kernel.org>
2021-01-27 5:47 ` [PATCH v5 15/16] x86/hyperv: implement an MSI domain for root partition Michael Kelley via Virtualization
[not found] ` <20210202173153.jkbvwck2vsjlbjbz@liuwe-devbox-debian-v2>
2021-02-02 18:15 ` Michael Kelley via Virtualization
[not found] ` <20210120120058.29138-17-wei.liu@kernel.org>
2021-01-27 5:47 ` [PATCH v5 16/16] iommu/hyperv: setup an IO-APIC IRQ remapping " Michael Kelley via Virtualization
[not found] ` <20210203124700.ugx5vd526455u7lb@liuwe-devbox-debian-v2>
2021-02-04 16:41 ` Michael Kelley via Virtualization
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