From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Anchal Agarwal <anchalag@amazon.com>
Cc: "tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@redhat.com" <mingo@redhat.com>,
"bp@alien8.de" <bp@alien8.de>, "hpa@zytor.com" <hpa@zytor.com>,
"jgross@suse.com" <jgross@suse.com>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"sstabellini@kernel.org" <sstabellini@kernel.org>,
"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
"roger.pau@citrix.com" <roger.pau@citrix.com>,
"axboe@kernel.dk" <axboe@kernel.dk>,
"davem@davemloft.net" <davem@davemloft.net>,
"rjw@rjwysocki.net" <rjw@rjwysocki.net>,
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"pavel@ucw.cz" <pavel@ucw.cz>,
"peterz@infradead.org" <peterz@infradead.org>,
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dwmw@amazon.co.uk
Subject: Re: [PATCH v3 01/11] xen/manage: keep track of the on-going suspend mode
Date: Tue, 1 Jun 2021 10:18:36 -0400 [thread overview]
Message-ID: <1ff91b30-3963-728e-aefb-57944197bdde@oracle.com> (raw)
In-Reply-To: <20210528215008.GA19622@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com>
On 5/28/21 5:50 PM, Anchal Agarwal wrote:
> That only fails during boot but not after the control jumps into the image. The
> non boot cpus are brought offline(freeze_secondary_cpus) and then online via cpu hotplug path. In that case xen_vcpu_setup doesn't invokes the hypercall again.
OK, that makes sense --- by that time VCPUs have already been registered. What I don't understand though is why resume doesn't fail every time --- xen_vcpu and xen_vcpu_info should be different practically always, shouldn't they? Do you observe successful resumes when the hypercall fails?
>
> Another line of thought is something what kexec does to come around this problem
> is to abuse soft_reset and issue it during syscore_resume or may be before the image get loaded.
> I haven't experimented with that yet as I am assuming there has to be a way to re-register vcpus during resume.
Right, that sounds like it should work.
-boris
next prev parent reply other threads:[~2021-06-01 14:19 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 22:22 [PATCH v3 00/11] Fix PM hibernation in Xen guests Anchal Agarwal
2020-08-21 22:25 ` [PATCH v3 01/11] xen/manage: keep track of the on-going suspend mode Anchal Agarwal
2020-09-13 15:43 ` boris.ostrovsky
2020-09-14 21:47 ` Anchal Agarwal
2020-09-15 0:24 ` boris.ostrovsky
2020-09-15 18:00 ` Anchal Agarwal
2020-09-15 19:58 ` boris.ostrovsky
2020-09-21 21:54 ` Anchal Agarwal
2020-09-22 16:18 ` boris.ostrovsky
2020-09-22 23:17 ` Anchal Agarwal
2020-09-25 19:04 ` Anchal Agarwal
2020-09-25 20:02 ` boris.ostrovsky
2020-09-25 22:28 ` Anchal Agarwal
2020-09-28 18:49 ` boris.ostrovsky
2020-09-30 21:29 ` Anchal Agarwal
2020-10-01 12:43 ` boris.ostrovsky
2021-05-21 5:26 ` Anchal Agarwal
2021-05-25 22:23 ` Boris Ostrovsky
2021-05-26 4:40 ` Anchal Agarwal
2021-05-26 18:29 ` Boris Ostrovsky
2021-05-28 21:50 ` Anchal Agarwal
2021-06-01 14:18 ` Boris Ostrovsky [this message]
2021-06-02 19:37 ` Anchal Agarwal
2021-06-03 20:11 ` Boris Ostrovsky
2021-06-03 23:27 ` Anchal Agarwal
2021-06-04 1:49 ` Boris Ostrovsky
2020-09-13 17:07 ` boris.ostrovsky
2020-08-21 22:26 ` [PATCH v3 02/11] xenbus: add freeze/thaw/restore callbacks support Anchal Agarwal
2020-09-13 16:11 ` boris.ostrovsky
2020-09-15 19:56 ` Anchal Agarwal
2020-08-21 22:26 ` [PATCH v3 03/11] x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume Anchal Agarwal
2020-08-21 22:27 ` [PATCH v3 04/11] x86/xen: add system core suspend and resume callbacks Anchal Agarwal
2020-09-13 17:25 ` boris.ostrovsky
2020-08-21 22:27 ` [PATCH v3 05/11] genirq: Shutdown irq chips in suspend/resume during hibernation Thomas Gleixner
2020-08-22 0:36 ` Thomas Gleixner
2020-08-24 17:25 ` Anchal Agarwal
2020-08-25 13:20 ` Christoph Hellwig
2020-08-25 15:25 ` Thomas Gleixner
2020-08-21 22:28 ` [PATCH v3 06/11] xen-blkfront: add callbacks for PM suspend and hibernation Anchal Agarwal
2020-08-21 22:29 ` [PATCH v3 07/11] xen-netfront: " Anchal Agarwal
2020-08-21 22:29 ` [PATCH v3 08/11] x86/xen: save and restore steal clock during PM hibernation Anchal Agarwal
2020-08-21 22:30 ` [PATCH v3 09/11] xen: Introduce wrapper for save/restore sched clock offset Anchal Agarwal
2020-08-21 22:30 ` [PATCH v3 10/11] xen: Update sched clock offset to avoid system instability in hibernation Anchal Agarwal
2020-09-13 17:52 ` boris.ostrovsky
2020-08-21 22:31 ` [PATCH v3 11/11] PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP_AREA Anchal Agarwal
2020-08-28 18:26 ` [PATCH v3 00/11] Fix PM hibernation in Xen guests Anchal Agarwal
2020-08-28 18:29 ` Rafael J. Wysocki
2020-08-28 18:39 ` Anchal Agarwal
2020-09-11 20:44 ` Anchal Agarwal
2020-09-11 15:19 ` boris.ostrovsky
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