From: Ian Campbell <ian.campbell@citrix.com>
To: "Lengyel, Tamas" <tlengyel@novetta.com>
Cc: xen-devel@lists.xen.org
Subject: Re: Question on QEMU restore process
Date: Tue, 26 May 2015 16:49:28 +0100 [thread overview]
Message-ID: <1432655368.14664.150.camel@citrix.com> (raw)
In-Reply-To: <CAD33N+6aufsZkVM8sNicZz2c5Xe-YbtjVXGrFqVCoxdkCFkRbQ@mail.gmail.com>
On Tue, 2015-05-26 at 17:38 +0200, Lengyel, Tamas wrote:
> Hi all,
>
> I'm wondering if someone can point me in the right direction. I'm
> trying to understand the process around domain save/restore using XL.
> I can see the xl save format and how its appended with the QEMU state
> aquired via the xen-save-devices-state qmp command (this is for
> upstream QEMU).
>
> However, I have a hard time locating the exact point where that save
> state is being loaded into the new QEMU process. I see in libxc that
> it should be dumped into "/var/lib/xen/qemu-resume" appended by the
> domain id of the newly created domain. It seems this was passed to
> QEMU via the -loadvm flag at one point, but on Xen 4.4 I don't see
> that flag on my QEMU processes when I restore a domain.
libxl__build_device_model_args_new appears to pass it as "-incoming
fd:N" where N is an open file descriptor which qemu will inherit from
its parent (libxl).
Ian.
next prev parent reply other threads:[~2015-05-26 15:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-26 15:38 Question on QEMU restore process Lengyel, Tamas
2015-05-26 15:49 ` Ian Campbell [this message]
2015-05-29 11:19 ` Lengyel, Tamas
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