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Re: [Xen-devel] Re: [RFC PATCH linux-2.6.18-xen] pciback: clean up (MSI-

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [RFC PATCH linux-2.6.18-xen] pciback: clean up (MSI-X vec, entrynr) list when resetting PCI device
From: Laszlo Ersek <lersek@xxxxxxxxxx>
Date: Wed, 01 Jun 2011 19:32:54 +0200
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 06/01/11 16:31, Konrad Rzeszutek Wilk wrote:
On Wed, Jun 01, 2011 at 01:02:02PM +0200, Laszlo Ersek wrote:
(Perhaps it's best to write a separate mail about this.)

Yes. You did use 'iommu=soft' on your bootup line right?

I thought I did; turns out I was wrong. Sorry for the noise.

Now I tried with "iommu=soft swiotlb=force", but this way the guest immediately disappears; it doesn't even start to produce console output.

# xm create -c f15-64bit-pv
Using config file "/etc/xen/f15-64bit-pv".
Using <class 'grub.GrubConf.GrubConfigFile'> to parse /grub/menu.lst
Started domain f15-64bit-pv

http://wiki.xen.org/xenwiki/XenPCIpassthrough says though:


    # Starting the DomU using pvgrub with 'iommu=soft swiotlb=force'
    breaks pvgrub.

Perhaps that could be the reason. Removing "swiotlb=force" and keeping only "iommu=soft" crashes (?) the same way.


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