Re: [PATCH v5 05/16] clocksource/hyperv: use MSR-based access if running as root
From: Pavel Tatashin <pasha.tatashin@soleen.com>
Date: 2021-01-20 16:18:21
Also in:
linux-hyperv, lkml
On Wed, Jan 20, 2021 at 7:01 AM Wei Liu [off-list ref] 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. Luckily Linux also has access to the MSR based
quoted hunk
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 <redacted> --- 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; +
Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com> _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization