Re: [Xen-devel] Xen, MCFG acpi table and E820 address map

[Santosh Jodh <Santosh.Jodh@xxxxxxxxxx>]

-----Original Message-----
From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx] 
Sent: Wednesday, September 04, 2013 8:01 AM
To: Jan Beulich
Cc: Santosh Jodh; David Vrabel; xen-devel; Boris Ostrovsky
Subject: Re: [Xen-devel] Xen, MCFG acpi table and E820 address map

On Wed, Sep 04, 2013 at 10:16:26AM +0100, Jan Beulich wrote:
> >>> On 04.09.13 at 03:13, Santosh Jodh <Santosh.Jodh@xxxxxxxxxx> wrote:
> > Xen will use information from MCFG acpi table to access PCIe 
> > extended configuration space. However, Xen validates MCFG table by 
> > making sure that the addresses specified in the MCFG table is 
> > correctly marked as reserved in the E820 address map. If it is not, 
> > the MCFG table is ignored - thereby preventing Xen from accessing PCIe 
> > extended configuration space.
> > 
> > I recently came across a workstation class system that supports 
> > VT-d. This system BIOS has a valid MCFG table. The BIOS does NOT 
> > report the MCFG addresses as reserved in the E820 address map. 
> > However, the addresses ARE claimed as reserved via the ACPI 
> > motherboard resource devnode (PNP0C01) mechanism.

Could you tell me what machine this is? It would be good to know to develop a 
patch against it.
[Santosh Jodh] Unfortunately, this is a new platform I cannot disclose much 
about. However, it seems like this issue has been seen on the following: Asus 
S5A laptop, Asus P5RD1-VM. There are few IBM systems as well - 
http://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-5080398

I should be able to test the patch and provide feedback on this particular 
system.


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