diff mbox series

[v3,1/4] drivers/clocksource/hyper-v: Introduce a pointer to TSC page

Message ID 166749832893.218190.16503272948154953294.stgit@skinsburskii-cloud-desktop.internal.cloudapp.net
State New
Headers
Series hyper-v: Introduce TSC page for root partition |

Commit Message

Stanislav Kinsburskii Nov. 3, 2022, 5:58 p.m. UTC 
  From: Stanislav Kinsburskiy <stanislav.kinsburskiy@gmail.com>

Will be used later keep the address of the remapped page for the root
partition as it will be Microsoft Hypervisor defined (and thus won't be a
static address).

Signed-off-by: Stanislav Kinsburskiy <stanislav.kinsburskiy@gmail.com>
CC: "K. Y. Srinivasan" <kys@microsoft.com>
CC: Haiyang Zhang <haiyangz@microsoft.com>
CC: Wei Liu <wei.liu@kernel.org>
CC: Dexuan Cui <decui@microsoft.com>
CC: Daniel Lezcano <daniel.lezcano@linaro.org>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: linux-hyperv@vger.kernel.org
CC: linux-kernel@vger.kernel.org
---
 drivers/clocksource/hyperv_timer.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Michael Kelley (LINUX) Nov. 3, 2022, 8:58 p.m. UTC | #1 
From: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com> Sent: Thursday, November 3, 2022 10:59 AM
> 
> Will be used later keep the address of the remapped page for the root
> partition as it will be Microsoft Hypervisor defined (and thus won't be a
> static address).
> 
> Signed-off-by: Stanislav Kinsburskiy <stanislav.kinsburskiy@gmail.com>
> CC: "K. Y. Srinivasan" <kys@microsoft.com>
> CC: Haiyang Zhang <haiyangz@microsoft.com>
> CC: Wei Liu <wei.liu@kernel.org>
> CC: Dexuan Cui <decui@microsoft.com>
> CC: Daniel Lezcano <daniel.lezcano@linaro.org>
> CC: Thomas Gleixner <tglx@linutronix.de>
> CC: linux-hyperv@vger.kernel.org
> CC: linux-kernel@vger.kernel.org
> ---
>  drivers/clocksource/hyperv_timer.c |    6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
> index 18de1f439ffd..b0b5df576e17 100644
> --- a/drivers/clocksource/hyperv_timer.c
> +++ b/drivers/clocksource/hyperv_timer.c
> @@ -367,9 +367,11 @@ static union {
>  	u8 reserved[PAGE_SIZE];
>  } tsc_pg __aligned(PAGE_SIZE);
> 
> +static struct ms_hyperv_tsc_page *tsc_page = &tsc_pg.page;
> +
>  struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
>  {
> -	return &tsc_pg.page;
> +	return tsc_page;
>  }
>  EXPORT_SYMBOL_GPL(hv_get_tsc_page);
> 
> @@ -407,7 +409,7 @@ static void suspend_hv_clock_tsc(struct clocksource *arg)
> 
>  static void resume_hv_clock_tsc(struct clocksource *arg)
>  {
> -	phys_addr_t phys_addr = virt_to_phys(&tsc_pg);
> +	phys_addr_t phys_addr = virt_to_phys(tsc_page);
>  	union hv_reference_tsc_msr tsc_msr;
> 
>  	/* Re-enable the TSC page */
> 

Reviewed-by: Michael Kelley <mikelley@microsoft.com>
diff mbox series

Patch

diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
index 18de1f439ffd..b0b5df576e17 100644
--- a/drivers/clocksource/hyperv_timer.c
+++ b/drivers/clocksource/hyperv_timer.c
@@ -367,9 +367,11 @@  static union {
 	u8 reserved[PAGE_SIZE];
 } tsc_pg __aligned(PAGE_SIZE);
 
+static struct ms_hyperv_tsc_page *tsc_page = &tsc_pg.page;
+
 struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
 {
-	return &tsc_pg.page;
+	return tsc_page;
 }
 EXPORT_SYMBOL_GPL(hv_get_tsc_page);
 
@@ -407,7 +409,7 @@  static void suspend_hv_clock_tsc(struct clocksource *arg)
 
 static void resume_hv_clock_tsc(struct clocksource *arg)
 {
-	phys_addr_t phys_addr = virt_to_phys(&tsc_pg);
+	phys_addr_t phys_addr = virt_to_phys(tsc_page);
 	union hv_reference_tsc_msr tsc_msr;
 
 	/* Re-enable the TSC page */