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From: Wei Liu <wei.liu2@citrix.com>
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>
Subject: Re: [PATCH] libxl: disallow PCI device assignment for HVM guest when PoD is enabled
Date: Fri, 10 Jan 2014 12:21:59 +0000	[thread overview]
Message-ID: <20140110122159.GI29180@zion.uk.xensource.com> (raw)
In-Reply-To: <52CFE496.5090906@citrix.com>

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

  reply	other threads:[~2014-01-10 12:22 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-10 11:27 [PATCH] libxl: disallow PCI device assignment for HVM guest when PoD is enabled Wei Liu
2014-01-10 11:39 ` Jan Beulich
2014-01-10 11:46   ` Wei Liu
2014-01-10 12:16     ` Andrew Cooper
2014-01-10 12:21       ` Wei Liu [this message]
2014-01-10 12:28       ` Jan Beulich
2014-01-10 14:03         ` Wei Liu
2014-01-10 14:07           ` Ian Campbell
2014-01-10 14:09           ` Jan Beulich
2014-01-10 14:15             ` Wei Liu
2014-01-10 14:52               ` Jan Beulich
2014-01-13 10:54 ` Wei Liu
2014-01-13 11:11   ` Ian Campbell
2014-01-13 11:45     ` Wei Liu
2014-01-13 11:47       ` Ian Campbell

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