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From: Stefan Hajnoczi <stefanha@redhat.com>
To: Steve Sistare <steven.sistare@oracle.com>
Cc: "Daniel P. Berrange" <berrange@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	"Jason Zeng" <jason.zeng@linux.intel.com>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"Juan Quintela" <quintela@redhat.com>,
	qemu-devel@nongnu.org,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	"Alex Williamson" <alex.williamson@redhat.com>,
	"Marc-André Lureau" <marcandre.lureau@redhat.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Philippe Mathieu-Daudé" <philmd@redhat.com>,
	"Markus Armbruster" <armbru@redhat.com>
Subject: Re: [PATCH V3 07/22] cpr
Date: Wed, 12 May 2021 17:19:02 +0100	[thread overview]
Message-ID: <YJv/9uOKbYmhAyQp@stefanha-x1.localdomain> (raw)
In-Reply-To: <1620390320-301716-8-git-send-email-steven.sistare@oracle.com>

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On Fri, May 07, 2021 at 05:25:05AM -0700, Steve Sistare wrote:
> To use the restart mode, qemu must be started with the memfd-alloc machine
> option.  The memfd's are saved to the environment and kept open across exec,
> after which they are found from the environment and re-mmap'd.  Hence guest
> ram is preserved in place, albeit with new virtual addresses in the qemu
> process.  The caller resumes the guest by calling cprload, which loads
> state from the file.  If the VM was running at cprsave time, then VM
> execution resumes.  cprsave supports any type of guest image and block
> device, but the caller must not modify guest block devices between cprsave
> and cprload.

Does QEMU's existing -object memory-backend-file on tmpfs or hugetlbfs
achieve the same thing?

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  reply	other threads:[~2021-05-12 16:20 UTC|newest]

Thread overview: 81+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-07 12:24 [PATCH V3 00/22] Live Update Steve Sistare
2021-05-07 12:24 ` [PATCH V3 01/22] as_flat_walk Steve Sistare
2021-05-07 12:25 ` [PATCH V3 02/22] qemu_ram_volatile Steve Sistare
2021-05-07 12:25 ` [PATCH V3 03/22] oslib: qemu_clr_cloexec Steve Sistare
2021-05-07 12:25 ` [PATCH V3 04/22] util: env var helpers Steve Sistare
2021-05-07 12:25 ` [PATCH V3 05/22] machine: memfd-alloc option Steve Sistare
2021-05-07 12:25 ` [PATCH V3 06/22] vl: add helper to request re-exec Steve Sistare
2021-05-07 14:31   ` Eric Blake
2021-05-13 20:19     ` Steven Sistare
2021-05-14  8:18       ` Daniel P. Berrangé
2021-05-12 16:27   ` Stefan Hajnoczi
2021-05-13 20:20     ` Steven Sistare
2021-05-07 12:25 ` [PATCH V3 07/22] cpr Steve Sistare
2021-05-12 16:19   ` Stefan Hajnoczi [this message]
2021-05-13 20:21     ` Steven Sistare
2021-05-14 11:28       ` Stefan Hajnoczi
2021-05-14 15:14         ` Steven Sistare
2021-05-18 13:42           ` Stefan Hajnoczi
2021-05-07 12:25 ` [PATCH V3 08/22] cpr: QMP interfaces Steve Sistare
2021-06-04 13:59   ` Eric Blake
2021-06-07 17:19     ` Steven Sistare
2021-05-07 12:25 ` [PATCH V3 09/22] cpr: HMP interfaces Steve Sistare
2021-05-07 12:25 ` [PATCH V3 10/22] pci: export functions for cpr Steve Sistare
2021-05-07 12:25 ` [PATCH V3 11/22] vfio-pci: refactor " Steve Sistare
2021-05-19 22:38   ` Alex Williamson
2021-05-21 13:33     ` Steven Sistare
2021-05-21 21:07       ` Alex Williamson
2021-05-21 21:18         ` Steven Sistare
2021-05-07 12:25 ` [PATCH V3 12/22] vfio-pci: cpr part 1 Steve Sistare
2021-05-21 22:24   ` Alex Williamson
2021-05-24 18:29     ` Steven Sistare
2021-06-11 18:15       ` Steven Sistare
2021-06-11 19:43         ` Steven Sistare
2021-05-07 12:25 ` [PATCH V3 13/22] vfio-pci: cpr part 2 Steve Sistare
2021-05-21 22:24   ` Alex Williamson
2021-05-24 18:31     ` Steven Sistare
2021-05-07 12:25 ` [PATCH V3 14/22] vhost: reset vhost devices upon cprsave Steve Sistare
2021-05-07 12:25 ` [PATCH V3 15/22] hostmem-memfd: cpr support Steve Sistare
2021-05-07 12:25 ` [PATCH V3 16/22] chardev: cpr framework Steve Sistare
2021-05-07 14:33   ` Eric Blake
2021-05-13 20:19     ` Steven Sistare
2021-05-07 12:25 ` [PATCH V3 17/22] chardev: cpr for simple devices Steve Sistare
2021-05-07 12:25 ` [PATCH V3 18/22] chardev: cpr for pty Steve Sistare
2021-05-07 12:25 ` [PATCH V3 19/22] chardev: cpr for sockets Steve Sistare
2021-05-07 12:25 ` [PATCH V3 20/22] cpr: only-cpr-capable option Steve Sistare
2021-05-07 12:25 ` [PATCH V3 21/22] cpr: maintainers Steve Sistare
2021-05-07 12:25 ` [PATCH V3 22/22] simplify savevm Steve Sistare
2021-05-07 13:00 ` [PATCH V3 00/22] Live Update no-reply
2021-05-13 20:42   ` Steven Sistare
2021-05-12 16:42 ` Stefan Hajnoczi
2021-05-13 20:21   ` Steven Sistare
2021-05-14 11:53     ` Stefan Hajnoczi
2021-05-14 15:15       ` Steven Sistare
2021-05-17 11:40         ` Stefan Hajnoczi
2021-05-17 19:10           ` Alex Williamson
2021-05-18 13:39             ` Stefan Hajnoczi
2021-05-18 15:48               ` Steven Sistare
2021-05-18  9:57         ` Dr. David Alan Gilbert
2021-05-18 16:00           ` Steven Sistare
2021-05-18 19:23             ` Dr. David Alan Gilbert
2021-05-18 20:01               ` Alex Williamson
2021-05-18 20:14               ` Steven Sistare
2021-05-20 13:00                 ` [PATCH V3 00/22] Live Update [reboot] Dr. David Alan Gilbert
2021-05-21 14:55                   ` Steven Sistare
2021-06-15 19:14                     ` Dr. David Alan Gilbert
2021-06-24 15:05                       ` Steven Sistare
2021-07-06 17:31                         ` Steven Sistare
2021-05-20 13:13                 ` [PATCH V3 00/22] Live Update [restart] Dr. David Alan Gilbert
2021-05-21 14:56                   ` Steven Sistare
2021-05-24 10:39                     ` Dr. David Alan Gilbert
2021-06-02 13:51                       ` Steven Sistare
2021-06-03 19:36                         ` Dr. David Alan Gilbert
2021-06-03 20:44                           ` Daniel P. Berrangé
2021-06-07 16:40                             ` [PATCH V3 00/22] Live Update [restart] : exec Steven Sistare
2021-06-14 14:31                               ` Steven Sistare
2021-06-14 14:36                                 ` Daniel P. Berrangé
2021-06-15 19:05                               ` Dr. David Alan Gilbert
2021-06-07 18:08                           ` [PATCH V3 00/22] Live Update [restart] : code replication Steven Sistare
2021-06-14 14:33                             ` Steven Sistare
2021-05-19 16:43 ` [PATCH V3 00/22] Live Update Steven Sistare
2021-06-02 15:19   ` Steven Sistare

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