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From: Anchal Agarwal <anchalag@amazon.com>
To: <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>,
	<hpa@zytor.com>, <x86@kernel.org>, <boris.ostrovsky@oracle.com>,
	<jgross@suse.com>, <linux-pm@vger.kernel.org>,
	<linux-mm@kvack.org>, <kamatam@amazon.com>,
	<sstabellini@kernel.org>, <konrad.wilk@oracle.com>,
	<roger.pau@citrix.com>, <axboe@kernel.dk>, <davem@davemloft.net>,
	<rjw@rjwysocki.net>, <len.brown@intel.com>, <pavel@ucw.cz>,
	<peterz@infradead.org>, <eduval@amazon.com>, <sblbir@amazon.com>,
	<anchalag@amazon.com>, <xen-devel@lists.xenproject.org>,
	<vkuznets@redhat.com>, <netdev@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <dwmw@amazon.co.uk>,
	<benh@kernel.crashing.org>
Subject: [PATCH 09/12] x86/xen: save and restore steal clock
Date: Tue, 19 May 2020 23:28:55 +0000	[thread overview]
Message-ID: <6f39a1594a25ab5325f34e1e297900d699cd92bf.1589926004.git.anchalag@amazon.com> (raw)
In-Reply-To: <cover.1589926004.git.anchalag@amazon.com>

From: Munehisa Kamata <kamatam@amazon.com>

Save steal clock values of all present CPUs in the system core ops
suspend callbacks. Also, restore a boot CPU's steal clock in the system
core resume callback. For non-boot CPUs, restore after they're brought
up, because runstate info for non-boot CPUs are not active until then.

Signed-off-by: Munehisa Kamata <kamatam@amazon.com>
Signed-off-by: Anchal Agarwal <anchalag@amazon.com>
---
 arch/x86/xen/suspend.c | 13 ++++++++++++-
 arch/x86/xen/time.c    |  3 +++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index 784c4484100b..dae0f74f5390 100644
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -91,12 +91,20 @@ void xen_arch_suspend(void)
 static int xen_syscore_suspend(void)
 {
 	struct xen_remove_from_physmap xrfp;
-	int ret;
+	int cpu, ret;
 
 	/* Xen suspend does similar stuffs in its own logic */
 	if (xen_suspend_mode_is_xen_suspend())
 		return 0;
 
+	for_each_present_cpu(cpu) {
+		/*
+		 * Nonboot CPUs are already offline, but the last copy of
+		 * runstate info is still accessible.
+		 */
+		xen_save_steal_clock(cpu);
+	}
+
 	xrfp.domid = DOMID_SELF;
 	xrfp.gpfn = __pa(HYPERVISOR_shared_info) >> PAGE_SHIFT;
 
@@ -118,6 +126,9 @@ static void xen_syscore_resume(void)
 
 	pvclock_resume();
 
+	/* Nonboot CPUs will be resumed when they're brought up */
+	xen_restore_steal_clock(smp_processor_id());
+
 	gnttab_resume();
 }
 
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index c8897aad13cd..33d754564b09 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -545,6 +545,9 @@ static void xen_hvm_setup_cpu_clockevents(void)
 {
 	int cpu = smp_processor_id();
 	xen_setup_runstate_info(cpu);
+	if (cpu)
+		xen_restore_steal_clock(cpu);
+
 	/*
 	 * xen_setup_timer(cpu) - snprintf is bad in atomic context. Hence
 	 * doing it xen_hvm_cpu_notify (which gets called by smp_init during
-- 
2.24.1.AMZN


  parent reply	other threads:[~2020-05-19 23:29 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-19 23:24 [PATCH 00/12] Fix PM hibernation in Xen guests Anchal Agarwal
2020-05-19 23:24 ` Anchal Agarwal
2020-05-19 23:24 ` [PATCH 01/12] xen/manage: keep track of the on-going suspend mode Anchal Agarwal
2020-05-19 23:24   ` Anchal Agarwal
2020-05-30 22:26   ` Boris Ostrovsky
2020-06-01 21:00     ` Agarwal, Anchal
2020-06-01 22:39       ` Boris Ostrovsky
2020-05-19 23:25 ` [PATCH 02/12] xenbus: add freeze/thaw/restore callbacks support Anchal Agarwal
2020-05-19 23:25   ` Anchal Agarwal
2020-05-30 22:56   ` Boris Ostrovsky
2020-06-01 23:36     ` Agarwal, Anchal
2020-05-19 23:25 ` [PATCH 03/12] x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume Anchal Agarwal
2020-05-19 23:25   ` Anchal Agarwal
2020-05-30 23:02   ` Boris Ostrovsky
2020-06-04 23:03     ` Anchal Agarwal
2020-06-04 23:03       ` Anchal Agarwal
2020-06-05 21:39       ` Boris Ostrovsky
2020-06-05 21:39         ` Boris Ostrovsky
2020-06-08 16:52         ` Anchal Agarwal
2020-06-08 16:52           ` Anchal Agarwal
2020-06-08 18:49           ` Boris Ostrovsky
2020-06-08 18:49             ` Boris Ostrovsky
2020-05-19 23:26 ` [PATCH 04/12] x86/xen: add system core suspend and resume callbacks Anchal Agarwal
2020-05-19 23:26   ` Anchal Agarwal
2020-05-30 23:10   ` Boris Ostrovsky
2020-06-03 22:40     ` Agarwal, Anchal
2020-06-05 21:24       ` Boris Ostrovsky
2020-06-08 17:09         ` Anchal Agarwal
2020-06-08 17:09           ` Anchal Agarwal
2020-05-19 23:26 ` [PATCH 05/12] genirq: Shutdown irq chips in suspend/resume during hibernation Anchal Agarwal
2020-05-19 23:34   ` Anchal Agarwal
2020-05-19 23:34   ` Anchal Agarwal
2020-05-19 23:26   ` Anchal Agarwal
2020-05-19 23:29   ` Singh, Balbir
2020-05-19 23:29     ` Singh, Balbir
2020-05-19 23:36     ` Agarwal, Anchal
2020-05-19 23:36       ` Agarwal, Anchal
2020-05-30 23:17   ` Boris Ostrovsky
2020-06-01 20:46     ` Agarwal, Anchal
2020-05-19 23:27 ` [PATCH 06/12] xen-blkfront: add callbacks for PM suspend and hibernation Anchal Agarwal
2020-05-19 23:27   ` Anchal Agarwal
2020-05-20  5:00   ` kbuild test robot
2020-05-20  5:00     ` kbuild test robot
2020-05-20  5:00     ` kbuild test robot
2020-05-20  5:07   ` kbuild test robot
2020-05-20  5:07     ` kbuild test robot
2020-05-21 23:48   ` Anchal Agarwal
2020-05-21 23:48     ` Anchal Agarwal
2020-05-22  1:43     ` Singh, Balbir
2020-05-22  1:43       ` Singh, Balbir
2020-05-23 12:32   ` kbuild test robot
2020-05-23 12:32     ` kbuild test robot
2020-05-28 12:30   ` Roger Pau Monné
2020-05-28 12:30     ` Roger Pau Monné
2020-05-19 23:28 ` [PATCH 07/12] xen-netfront: " Anchal Agarwal
2020-05-19 23:28   ` Anchal Agarwal
2020-05-19 23:28 ` [PATCH 08/12] xen/time: introduce xen_{save,restore}_steal_clock Anchal Agarwal
2020-05-19 23:28   ` Anchal Agarwal
2020-05-30 23:32   ` Boris Ostrovsky
2020-05-19 23:28 ` Anchal Agarwal [this message]
2020-05-19 23:28   ` [PATCH 09/12] x86/xen: save and restore steal clock Anchal Agarwal
2020-05-30 23:44   ` Boris Ostrovsky
2020-06-04 18:33     ` Anchal Agarwal
2020-06-04 18:33       ` Anchal Agarwal
2020-05-19 23:29 ` [PATCH 10/12] xen: Introduce wrapper for save/restore sched clock offset Anchal Agarwal
2020-05-19 23:29   ` Anchal Agarwal
2020-05-19 23:29 ` [PATCH 11/12] xen: Update sched clock offset to avoid system instability in hibernation Anchal Agarwal
2020-05-19 23:29   ` Anchal Agarwal
2020-05-19 23:29 ` [PATCH 12/12] PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP_AREA Anchal Agarwal
2020-05-19 23:29   ` Anchal Agarwal
2020-05-28 17:59 ` [PATCH 00/12] Fix PM hibernation in Xen guests Agarwal, Anchal
2020-05-28 17:59   ` Agarwal, Anchal

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