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Date: Thu, 5 Nov 2020 16:58:02 +0000 From: Wei Liu <wei.liu@...nel.org> To: Linux on Hyper-V List <linux-hyperv@...r.kernel.org> Cc: virtualization@...ts.linux-foundation.org, Linux Kernel List <linux-kernel@...r.kernel.org>, Michael Kelley <mikelley@...rosoft.com>, Vineeth Pillai <viremana@...ux.microsoft.com>, Sunil Muthuswamy <sunilmut@...rosoft.com>, Nuno Das Neves <nunodasneves@...ux.microsoft.com>, Wei Liu <wei.liu@...nel.org>, "K. Y. Srinivasan" <kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Stephen Hemminger <sthemmin@...rosoft.com>, Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner <tglx@...utronix.de> Subject: [PATCH v2 05/17] clocksource/hyperv: use MSR-based access if running as root Signed-off-by: Wei Liu <wei.liu@...nel.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
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