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Date: Fri, 21 Aug 2020 22:30:11 +0000 From: Anchal Agarwal <anchalag@...zon.com> To: <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>, <hpa@...or.com>, <x86@...nel.org>, <boris.ostrovsky@...cle.com>, <jgross@...e.com>, <linux-pm@...r.kernel.org>, <linux-mm@...ck.org>, <kamatam@...zon.com>, <sstabellini@...nel.org>, <konrad.wilk@...cle.com>, <roger.pau@...rix.com>, <axboe@...nel.dk>, <davem@...emloft.net>, <rjw@...ysocki.net>, <len.brown@...el.com>, <pavel@....cz>, <peterz@...radead.org>, <eduval@...zon.com>, <sblbir@...zon.com>, <anchalag@...zon.com>, <xen-devel@...ts.xenproject.org>, <vkuznets@...hat.com>, <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <dwmw@...zon.co.uk>, <benh@...nel.crashing.org> Subject: [PATCH v3 09/11] xen: Introduce wrapper for save/restore sched clock offset Introduce wrappers for save/restore xen_sched_clock_offset to be used by PM hibernation code to avoid system instability during resume. Signed-off-by: Anchal Agarwal <anchalag@...zon.com> --- arch/x86/xen/time.c | 15 +++++++++++++-- arch/x86/xen/xen-ops.h | 2 ++ 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c index 91f5b330dcc6..e45349178ffc 100644 --- a/arch/x86/xen/time.c +++ b/arch/x86/xen/time.c @@ -387,12 +387,23 @@ static const struct pv_time_ops xen_time_ops __initconst = { static struct pvclock_vsyscall_time_info *xen_clock __read_mostly; static u64 xen_clock_value_saved; +/*This is needed to maintain a monotonic clock value during PM hibernation */ +void xen_save_sched_clock_offset(void) +{ + xen_clock_value_saved = xen_clocksource_read() - xen_sched_clock_offset; +} + +void xen_restore_sched_clock_offset(void) +{ + xen_sched_clock_offset = xen_clocksource_read() - xen_clock_value_saved; +} + void xen_save_time_memory_area(void) { struct vcpu_register_time_memory_area t; int ret; - xen_clock_value_saved = xen_clocksource_read() - xen_sched_clock_offset; + xen_save_sched_clock_offset(); if (!xen_clock) return; @@ -435,7 +446,7 @@ void xen_restore_time_memory_area(void) out: /* Need pvclock_resume() before using xen_clocksource_read(). */ pvclock_resume(); - xen_sched_clock_offset = xen_clocksource_read() - xen_clock_value_saved; + xen_restore_sched_clock_offset(); } static void xen_setup_vsyscall_time_info(void) diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index 9f0a4345220e..9a79e210119c 100644 --- a/arch/x86/xen/xen-ops.h +++ b/arch/x86/xen/xen-ops.h @@ -69,6 +69,8 @@ void xen_save_time_memory_area(void); void xen_restore_time_memory_area(void); void xen_init_time_ops(void); void xen_hvm_init_time_ops(void); +void xen_save_sched_clock_offset(void); +void xen_restore_sched_clock_offset(void); irqreturn_t xen_debug_interrupt(int irq, void *dev_id); -- 2.16.6
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