Re: [Xen-devel] Issues with PCI-Passtrough (VT-d) in HVM with Xen 4.6

["Jürgen Walter" <juwalter@xxxxxxxxx>]

Hi Jan,


On 3 Jun 2016, at 16:20, Jan Beulich wrote:

> > > > On 03.06.16 at 15:26, <JBeulich@xxxxxxxx> wrote:
> > > > > On 03.06.16 at 14:02, <juwalter@xxxxxxxxx> wrote:
> > >     or is this just some method the overwrite all registers with
> > > "ffffffff" first and then set the actual value?
> > >
> > >    [914572] xbk: 06:00.0: write request 4 bytes at 0x10 = ffffffff
> > >    [914574] xbk: 06:00.0: read 4 bytes at 0x10
> > >    [914582] xbk: 06:00.0: read 4 bytes at 0x10 = f7a00000
> > >    [914591] xbk: 06:00.0: read 4 bytes at 0x10
> > >    [914599] xbk: 06:00.0: read 4 bytes at 0x10 = 10000      <---- 
> > > fail
> > That's an unexpected value, indeed (but seems to match up with
> > the source, so there's definitely something wrong here - this
> > presumably ought to be 0xffff0000, meaning the size of that
> > region is 64k).
> Mind trying out the attached patch?
Many thanks for your patch!! I did try it, and it is different now 
(details in files attached)
"best of conf_space_header" see below.

I cannot really make sense of it, though. Can you?

Thank you, Jürgen


original:

xen-pciback: 0000:06:00.0: write request 4 bytes at 0x10 = ffffffff
xen-pciback: 0000:06:00.0: read 4 bytes at 0x10
xen-pciback: 0000:06:00.0: read 4 bytes at 0x10 = f7a00000
xen-pciback: 0000:06:00.0: read 4 bytes at 0x10
xen-pciback: 0000:06:00.0: read 4 bytes at 0x10 = 10000


patched:

xen-pciback: 0000:06:00.0: write request 4 bytes at 0x10 = ffffffff
xen-pciback: 0000:06:00.0: read 4 bytes at 0x10
xen-pciback: 0000:06:00.0: read 4 bytes at 0x10 = f7a00000
xen-pciback: 0000:06:00.0: read 4 bytes at 0x10
xen-pciback: 0000:06:00.0: read 4 bytes at 0x10 = ffff0000

Attachment: cmp-orig-patch.txt
Description: Text document

Attachment: pci-attach-orig.txt
Description: Text document

Attachment: pci-attach-patch.txt
Description: Text document

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