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Re: [Xen-devel] Questions about hvm domU default devices with upstream qemu

Il 04/09/2013 15:17, Stefano Stabellini ha scritto:
On Wed, 4 Sep 2013, Fabio Fantoni wrote:
Il 04/07/2013 15:51, Fabio Fantoni ha scritto:
Last year I posted a question about default devices of upstream qemu that
differ from qemu traditional, like empty floppy and cdrom in particular.
About empty floppy now is disabled as workaround.
About empty cdrom Stabellini tells that is useful, so I tried to use it but
cd-insert was failing,and I must define other empty cdrom on xl
configuration file, for example with: ',raw,hdb,ro,cdrom'.
It seem that there isn't default devices usable without define them in xen,
and I think that probably need to revise the definition of the devices to
avoid empty and unusable ones and to do everything as best as possible (also
with possibly reviewing qemu side).
Another good thing is also consider pv domU case and possible future support
of spice and/or other useful features.
Thanks for any reply.
I seen no replies about this, I think is important improve upstream qemu
support and remove the traditional ASA upstream will be equivalent or superior
in all features.

I also think is good idea add q35 support on xen.
Seem that hvm domUs have performance limits, in particular on windows domUs
(also with pv drivers) caused probably by old hardware emulation by qemu
and/or xen support limited on some instruction sets.
I don't know how to add essential q35 support on hvmloader to do some tests
and have effective data about improvements.
Anyone on this?
I agree that this is important and thanks for raising the issue.
It would be nice if somebody stepped up to do the q35 work.

Thanks for reply, can you reply also on questions about default devices with upstream qemu please?

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