Xen project Mailing List

2014-02-21 22:41 GMT+01:00 Zhang, Eniac <eniac-xw.zhang@xxxxxx>:

Hi all,

I am playing with q35 chipset in qemu (1.6.1). It seems we can’t enable q35 machine under xen yet. I made a few quick hacks which all fail miserably (linux kernel oops and window BSOD). I was wondering why this hasn’t been done (q35 was introduced into qemu in 2009).

Next question, vfio works very well for me in standalone qemu (with Linux host handling iommu), but is that supported under xen? I haven’t tried anything there yet because my gut-feeling is that it won’t work. Because passing vfio device to qemu can only be done on qemu commandline, and xen is not aware of this passing through device, thus not able to make iommu arrangement for this device. Am I on the right track here?

I am interested in implementing both these two features. I’d like to connect with anyone who’s already on this so we don’t duplicate the efforts.

I di some fast test with q35 time ago, one problem found is disks not working with old qemu parameter, with new parameters (-device) see them on boot but trying to do a patch with new qemu parameters compatible also with old cipset with ide I found that automatic bus selection is bugged, unfortunately, after I had more time to continue nor the knowledge to make needed changes in hvmloader.

Regards/Eniac

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Re: [Xen-devel] q35 in xen? vfio in xen?