From: Kaushik Bhandankar <kaushikb@cc.gatech.edu>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Pending Disk I/O requests during live VM migration
Date: Thu, 04 Oct 2007 12:43:16 -0400 [thread overview]
Message-ID: <47051824.1080607@cc.gatech.edu> (raw)
In-Reply-To: <f43fc5580710040930t589a22ebj669af91504956193@mail.gmail.com>
Blue Swirl wrote:
> On 10/4/07, Kaushik Bhandankar <kaushikb@cc.gatech.edu> wrote:
>
>> I am trying to implement functionality in fully-virtualized xen wherein
>> the responses to the pending disk I/O requests during live VM migration
>> get trasnsferred to the new VMM form the old VMM. Specifically, I am
>> looking at IDE disk (tools/ioemu/hw/ide.c)
>>
>
> You should ask Xen related questions in xen lists. At least in Qemu
> pending I/O are flushed before VM save in vl.c:5522.
>
Thanks Blue...
somebody in the xen-devel list suggested to mail this list about it....
Anyway, I have some IDE related questions which somebody on this list
might answer
1) I guess the IDE disk code is in ioemu/hw/ide.c. But where is the IDE
disk controller code located ??
2) I do not really understand BMDMA in ioemu/hw/ide.c. google doesnt
seem to be helping much here. Any documentation about the QEMU IDE disks
would be greatly appreciated.
3) vl.c:5522 seems to be not the correct code (I guess our vl.c codes
are different).. Could you point me to the routine in vl.c where the
pending disk IO requests are flushed before VM save (I guess the VM save
happens in qemu_savevm_state() in vl.c wherein it invokes all the
registered save handlers)?
4) Somebody told me that the pending disk IO requests are stored
somewhere in quemu's I/O disk model but I am not sure exactly
where....Can somebody help me with this ?
Thanks,
Kaushik
next prev parent reply other threads:[~2007-10-04 16:43 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-04 16:01 [Qemu-devel] Pending Disk I/O requests during live VM migration Kaushik Bhandankar
2007-10-04 16:30 ` Blue Swirl
2007-10-04 16:43 ` Kaushik Bhandankar [this message]
2007-10-04 17:05 ` Blue Swirl
2007-10-11 22:00 ` Kaushik Bhandankar
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