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Re: [Xen-devel] Some issues in recent ChangeSet.

To: "Yu, Ke" <ke.yu@xxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Some issues in recent ChangeSet.
From: "Zhai, Edwin" <edwin.zhai@xxxxxxxxx>
Date: Fri, 15 Sep 2006 11:11:25 +0800
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Steven Hand <Steven.Hand@xxxxxxxxxxxx>, "Zhai, Edwin" <edwin.zhai@xxxxxxxxx>, "Zheng, Jeff" <jeff.zheng@xxxxxxxxx>
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On Thu, Sep 14, 2006 at 01:47:11PM +0800, Yu, Ke wrote:
> Keir Fraser wrote:
> > On 4/9/06 8:19 am, "Yu, Ke" <ke.yu@xxxxxxxxx> wrote:
> > 
> >> I also see HVM domain reboot failed again in recent cset.
> >> 
> >> A quick look showes qemu-dm and HV use diferrent MFN to map
> >> shared_page after rebooting, this will cause DM event channel
> >> binding failure. In my box, DM use mfn 0x2d406  while HV use mfn
> >> 0x2d426 to map shared page, they differ 0x20 pages. Looks like
> >> xc_get_pfn_list is incorrect after rebooting. I will look into this
> >> issue. 
same issue happened when vmx save/restore.
ke's short-term patch can fix it.
any comments?


> > 
> > Short-term fix: For HVM guests, return frame list by scanning the P2M
> > table so you definitely get the frames in the right order (currently
> > it always scans the ownership linked list, which actually has no
> > guaranteed order). 
> > 
> > Long-term fix: Always map HVM guest pages by PFN rather than MFN.
> > This will avoid domain0 needing to manually do P->M translations --
> > it'll instead happen automatically inside Xen. Much neater.
> > 
> > Overall we should be aiming to get read of get_pfn_list entirely,
> > especially for HVM guests.
> > 
> >  -- Keir
> Hi Keir, 
> Please see the attached short-term fix. Hopefully, it can be applied before 
> 3.0.3. 
> I have tested it with several memory combinations, and all pass:
> ia32 guest, ia32 host, 1G guest mem
> ia32 pae guest, ia32pae host, 1.5G guest mem,
> ia32 guest, ia32e host, 1G guest mem
> ia32e guest, ia32e host, 4G guest mem
> ia32e guest, ia32e host, 8G guest mem
> Best Regards
> Ke
> ----------------
> Intel Opensource Technology Center

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best rgds,

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