Thread (17 messages) 17 messages, 4 authors, 2022-12-02

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

From: Michael Kelley (LINUX) <hidden>
Date: 2022-11-03 20:58:31
Also in: lkml

From: Stanislav Kinsburskii <redacted> Sent: Thursday, November 3, 2022 10:59 AM
quoted hunk ↗ jump to hunk
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 <redacted>
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 <redacted>
CC: Thomas Gleixner <redacted>
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 <redacted>
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