Re: pci-passthrough not working on 4.0.1-rc1-pre: mm.c:3847:d10 Bad page 00000000001beab4: ed=ffff830151210000(10), sd=ffff830151210000, caf=8000000000000002, taf=7400000000000001

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Wed, Apr 21, 2010 at 03:58:29PM +0200, Sander Eikelenboom wrote:
> Hi Konrad,
> 
> Only tested it today, but the 2.6.33 kernel i used from your tree a couple of weeks ago also gives the bad page in xm dmesg.

This is with the new Xen version (4.1) or the older one? Can you send me
your guest config file? What happens if you don't use pv-grub and
instead plunk the kernel and initrd straight from the guest and
set it them to 'kernel=blah' and 'initrd=blah2'

> The domU doesn't even boot, on console it reports the things below in this case it seems to go wrong on domain creation allready.
> I think port 5 refers to pci device 5 i'm trying to passthrough, without the pci=['0000:05:00.0'] line the domain boots fine.

There  is  a bug in the pv-grub (or py-grub?) where extra
arguments (such as iommu=soft) choke the loader. Somebody else saw this
some time ago and as a work-around referenced the kernel and initrm
directly. 

> 
>   Booting 'Debian GNU/Linux, vmlinuz-2.6.33'
> 
> lock
> root            (hd1)
>  Filesystem type is ext2fs, using whole disk
> kernel          /boot/vmlinuz-2.6.33 root=/dev/xvda2 ro iommu=soft swiotlb=forc
> e
> initrd          /boot/initrd.img-2.6.33
> 
> close blk: backend=/local/domain/0/backend/vbd/21/51713 node=device/vbd/51713
> close blk: backend=/local/domain/0/backend/vbd/21/51714 node=device/vbd/51714
> port 5 still bound!
> 
> 
> in xm dmesg:
> (XEN) mm.c:3847:d21 Bad page 000000000013ea83: ed=ffff8301f3a70000(21), sd=ffff8301f3a70000, caf=8000000000000002, taf=7400000000000001
> (XEN) mm.c:3847:d21 Bad page 000000000013ea83: ed=ffff8301f3a70000(21), sd=ffff8301f3a70000, caf=8000000000000002, taf=7400000000000001
> (XEN) mm.c:3847:d21 Bad page 000000000013ea83: ed=ffff8301f3a70000(21), sd=ffff8301f3a70000, caf=8000000000000002, taf=7400000000000001
> (XEN) mm.c:3847:d21 Bad page 000000000013ea83: ed=ffff8301f3a70000(21), sd=ffff8301f3a70000, caf=8000000000000002, taf=7400000000000001
> (XEN) mm.c:3847:d21 Bad page 000000000013ea83: ed=ffff8301f3a70000(21), sd=ffff8301f3a70000, caf=8000000000000002, taf=7400000000000001
> (XEN) mm.c:3847:d21 Bad page 000000000013ea83: ed=ffff8301f3a70000(21), sd=ffff8301f3a70000, caf=8000000000000002, taf=7400000000000001
>