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clocksource: hyper-v: Introduce a pointer to TSC page

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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
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Anirudh Rayabharam <anrayabh@linux.microsoft.com>
Link: https://lore.kernel.org/r/166749832893.218190.16503272948154953294.stgit@skinsburskii-cloud-desktop.internal.cloudapp.net
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Stanislav Kinsburskiy 2022-11-03 17:58:48 +00:00 committed by Wei Liu
parent 202818e1c8
commit 76be6331a8
1 changed files with 4 additions and 2 deletions
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6
drivers/clocksource/hyperv_timer.c
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@ -367,9 +367,11 @@ static union {
u8 reserved[PAGE_SIZE]; u8 reserved[PAGE_SIZE];
} tsc_pg __aligned(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) struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
{ {
return &tsc_pg.page; return tsc_page;
} }
EXPORT_SYMBOL_GPL(hv_get_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) 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; union hv_reference_tsc_msr tsc_msr;
/* Re-enable the TSC page */ /* Re-enable the TSC page */