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Re: [Xen-devel] [PATCH] [IOEMU]: fix the crash of HVM live migration wit

To: "Zhai, Edwin" <edwin.zhai@xxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] [IOEMU]: fix the crash of HVM live migration with intensive disk access
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Tue, 11 Aug 2009 13:56:24 +0100
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
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On Tue, 11 Aug 2009, Zhai, Edwin wrote:
>  [IOEMU]: fix the crash of HVM live migration with intensive disk access
> Intensive disk access, e.g. sum of big file, during HVM live migration would 
> cause guest error even file system crash. Guest dmesg said
> "attempt to access beyond end of device
> hda1: rw=0, want=10232032112, limit=10474317"
> Current map cache used by qemu dma doesn't mark the page dirty, so that these 
> pages(probably holding DMA data struct) are not transferred in the last 
> iteration during live migration.
> This patch fixes it, and also merges the qemu's original dirty bitmap used by 
> other devices such as vga.
> Signed-Off-By: Zhai Edwin <edwin.zhai@xxxxxxxxx>

I think the fix is correct but we should thinking about dropping
logdirty and start using xc_hvm_modified_memory instead for all cases.
I think Gianluca also may have something to say about this but this week
he is on vacation.

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