From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wei Liu <wei.liu2@citrix.com>
Subject: Re: [PATCH] libxl: disallow PCI device assignment for
 HVM guest when PoD is enabled
Date: Fri, 10 Jan 2014 12:21:59 +0000
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To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Ian Campbell <ian.campbell@citrix.com>, Ian Jackson <ian.jackson@eu.citrix.com>, Jan Beulich <JBeulich@suse.com>, Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>, xen-devel <xen-devel@lists.xenproject.org>, Xiantao Zhang <xiantao.zhang@intel.com>
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On Fri, Jan 10, 2014 at 12:16:22PM +0000, Andrew Cooper wrote:
> On 10/01/2014 11:46, Wei Liu wrote:
> > On Fri, Jan 10, 2014 at 11:39:51AM +0000, Jan Beulich wrote:
> >>>>> On 10.01.14 at 12:27, Wei Liu <wei.liu2@citrix.com> wrote:
> >>> +    /* We cannot have PoD and PCI device assignment at the same time
> >>> +     * for HVM guest. It was reported that VT-d engine cannot
> >> There's still a "VT-d" left in here...
> >>
> > I mentioned AMD as well. Was trying to clarify things a bit more...
> >
> > Wei.
> 
> Use "IOMMU"/"PCI Passthrough"/etc as appropriate, which are vendor neutral.
> 
> There is no way for for PoD (or Paging for that matter) to work in
> combination with PCIPassthrough, as you need all the backing RAM for all
> gfns to exist to receive DMA.
> 

Thanks for clarification. I will fix this comment.

Wei.

> ~Andrew