From: Anchal Agarwal <anchalag@amazon.com>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>,
<hpa@zytor.com>, <x86@kernel.org>, <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>,
<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>,
<anchalag@amazon.com>
Subject: Re: [PATCH 09/12] x86/xen: save and restore steal clock
Date: Thu, 4 Jun 2020 18:33:36 +0000 [thread overview]
Message-ID: <20200604183336.GA25251@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> (raw)
In-Reply-To: <5edb4147-af12-3a0e-e8f7-5b72650209ac@oracle.com>
On Sat, May 30, 2020 at 07:44:06PM -0400, Boris Ostrovsky wrote:
> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe.
>
>
>
> On 5/19/20 7:28 PM, Anchal Agarwal wrote:
> > 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();
>
>
> Doesn't make any difference but I think since this patch is where you
> are dealing with clock then pvclock_resume() should be added here and
> not in the earlier patch.
>
>
> -boris
I think the reason it may be in previous patch because it was a part
of syscore_resume and steal clock fix came in later.
It could me moved to this patch that deals with all clock stuff.
-Anchal
>
>
> >
> > + /* 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
>
>
>
next prev parent reply other threads:[~2020-06-04 18:34 UTC|newest]
Thread overview: 42+ 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 ` [PATCH 01/12] xen/manage: keep track of the on-going suspend mode 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
2020-05-30 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
2020-05-30 23:02 ` Boris Ostrovsky
2020-06-04 23:03 ` Anchal Agarwal
2020-06-05 21:39 ` Boris Ostrovsky
2020-06-08 16:52 ` Anchal Agarwal
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
2020-05-30 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
2020-05-19 23:26 ` [PATCH 05/12] genirq: Shutdown irq chips in suspend/resume during hibernation Anchal Agarwal
2020-05-19 23:29 ` Singh, Balbir
2020-05-19 23:36 ` Agarwal, Anchal
2020-05-19 23:34 ` Anchal Agarwal
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
2020-05-20 5:00 ` kbuild test robot
2020-05-20 5:07 ` kbuild test robot
2020-05-21 23:48 ` Anchal Agarwal
2020-05-22 1:43 ` Singh, Balbir
2020-05-23 12:32 ` kbuild test robot
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 ` [PATCH 08/12] xen/time: introduce xen_{save,restore}_steal_clock Anchal Agarwal
2020-05-30 23:32 ` Boris Ostrovsky
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 [this message]
2020-05-19 23:29 ` [PATCH 10/12] xen: Introduce wrapper for save/restore sched clock offset 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 ` [PATCH 12/12] PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP_AREA Anchal Agarwal
2020-05-28 17:59 ` [PATCH 00/12] Fix PM hibernation in Xen guests Agarwal, Anchal
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