Re: [Xen-devel] [PATCH] tools/xl: disallow PCI device assignment for HVM guest when PoD is enabled

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Jan 09, 2014 at 02:19:14PM -0500, Konrad Rzeszutek Wilk wrote:
> On Thu, Jan 09, 2014 at 07:17:03PM +0000, Wei Liu wrote:
> > This replicates a Xend behavior, see ec789523749 ("xend: Dis-allow
> > device assignment if PoD is enabled.").
> > 
> > Allegedly-reported-by: Konrad Wilk <konrad.wilk@xxxxxxxxxx>
> > Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> > Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
> > Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> > ---
> > This was listed in 4.4 development update. A quick skim through
> > hypervisor vtd changesets suggests the situation stays unchanged since 3
> > years ago -- at least I didn't find any log message related to "PoD".
> > 
> > Rune: git log --since="2010-01-21" xen/drivers/passthrough/vtd
> > (It was first reported on 2010-01-21)
> > 
> > This patch is tested with setting memory=, maxmem= and pci=[] parameters
> > in both HVM and PV guests. In HVM guest's case I need to have
> > claim_mode=0 in /etc/xen/xl.conf to make xl actually create HVM with PoD
> > mode enabled.
> 
> Which implies something is amiss with the PoD memory usage >= nr_pages
> for the domain. Which implies that it allocates more memory than it asked
> for.
> 
> We should track that as a bug I think.

Ian, can you track this in Xen bug tracker?

Claim mode doesn't work for HVM with PoD enabled.

Wei.

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