From: Paolo Bonzini <pbonzini@redhat.com>
To: "Marc-André Lureau" <marcandre.lureau@gmail.com>,
Linhaifeng <haifeng.lin@huawei.com>
Cc: Thibaut Collet <thibaut.collet@6wind.com>,
jasowang@redhat.com, QEMU <qemu-devel@nongnu.org>,
stefanha@redhat.com, "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v4 1/1] vhost user: add support of live migration
Date: Fri, 17 Jul 2015 04:25:57 +0200 [thread overview]
Message-ID: <55A867B5.9000100@redhat.com> (raw)
In-Reply-To: <CAJ+F1C+Wd46ng9ahN+5h_9GbbEVk-EHOOqk-1AZ-_P_fPvts7w@mail.gmail.com>
On 17/07/2015 02:19, Marc-André Lureau wrote:
>>> >> How does vhost-user do this? I can see this patch providing enough
>>> >> support for *non*live migration. However, it cannot be enough for live
>>> >> migration unless I'm missing something obvious.
>>> >>
>>> >> Paolo
>> >
>> > Agree. vhost-user should mmap the log memory and mark dirty pages when send
>> > or receive packets.
> This is already supported by vhost-user protocol, isn't it? The
> LOG_BASE/FD and vring log_guest_addr are provided. I can't find any
> vhost-user backend implementing dirty bitmaps yet though, but it looks
> like it should work. I suppose the backend should stop all IO after
> RESET_OWNER is received.
But LOG_BASE makes little sense across processes, and LOG_FD is unused
in QEMU, isn't it? So this patch is not enough to add support of live
migration.
Paolo
next prev parent reply other threads:[~2015-07-17 2:26 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-26 9:22 [Qemu-devel] [PATCH v4 0/1] Add live migration for vhost user Thibaut Collet
2015-06-26 9:22 ` [Qemu-devel] [PATCH v4 1/1] vhost user: add support of live migration Thibaut Collet
2015-07-10 13:05 ` Paolo Bonzini
2015-07-13 2:27 ` Linhaifeng
2015-07-17 0:19 ` Marc-André Lureau
2015-07-17 2:25 ` Paolo Bonzini [this message]
2015-07-17 10:34 ` Marc-André Lureau
2015-07-17 12:57 ` Paolo Bonzini
2015-07-17 13:35 ` Marc-André Lureau
2015-07-17 13:50 ` Paolo Bonzini
2015-07-18 0:07 ` Marc-André Lureau
2015-07-18 13:18 ` Paolo Bonzini
2015-07-17 0:20 ` [Qemu-devel] [PATCH v4 0/1] Add live migration for vhost user Marc-André Lureau
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