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Re: [Xen-devel] dom0/pvh: Dom0 PVH with PCI passthrough support status

On Tue, Oct 30, 2018 at 01:32:38PM +0200, Alexandru Vasile wrote:
> Hello,
> > There is some low-hanging fruit, both in Xen and the Linux kernel,
> > which can really be worked in parallel by different parties, so let me
> > know if you have some capacity and we can speak about sharing the
> > workload.
> Could you share more details about the low-hanging fruit?
> Following with an update, I managed to start a PVH Dom0 with the patches
> from Roger’s fixes branch 
> http://xenbits.xen.org/gitweb/?p=people/royger/xen.git;a=shortlog;h=refs/heads/fixes-pvh-v2
> and with the xen kernel tip
> https://kernel.googlesource.com/pub/scm/linux/kernel/git/xen/tip/ (a978a5b –
> latest commit).
> When trying to PCI passthrough a NIC to a HVM DomU guest from PVH Dom0, the
> host completely freezes and reboots and xl returns the following errors:

I think you mean xl returns such error before the host freezes?

> libxl: error:libxl_qmp.c:334:qmp_handle_error_reponse: Domain 1:received an
> error message from QMP server: Mapping machine irq 16 to pirq -1 failed:

Note the "-1" here. It looks wrong. The toolstack and QEMU probably need
to be patched to handle DomU passthrough from a PVH Dom0.


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