Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Subject: [PATCH v2 1/4] drivers/clocksource/hyper-v: Introduce a pointer to
 TSC page
From:   Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Cc:     Stanislav Kinsburskiy <stanislav.kinsburskiy@gmail.com>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org
Date:   Wed, 02 Nov 2022 22:07:24 +0000
Message-ID: <166742684418.205987.14378848205726386650.stgit@skinsburskii-cloud-desktop.internal.cloudapp.net>
In-Reply-To: <166742670556.205987.18227942188746093700.stgit@skinsburskii-cloud-desktop.internal.cloudapp.net>
References: <166742670556.205987.18227942188746093700.stgit@skinsburskii-cloud-desktop.internal.cloudapp.net>
User-Agent: StGit/0.19
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
To:     unlisted-recipients:; (no To-header on input)
Precedence: bulk

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(-)

diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
index 11332c82d1af..c4dbf40a3d3e 100644
--- a/drivers/clocksource/hyperv_timer.c
+++ b/drivers/clocksource/hyperv_timer.c
@@ -366,9 +366,11 @@ 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);
 
@@ -406,7 +408,7 @@ 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 */