Re: [Xen-devel] [PATCH RFC] x86/HVM: assume default ioreq servers follow new bufioreq pointer access model

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 01.09.15 at 15:15, <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> On Fri, 28 Aug 2015, Andrew Cooper wrote:
>> On 28/08/15 17:15, Jan Beulich wrote:
>> > There's no way for Xen to know or for such a qemu to tell us.
>> >
>> > Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> > ---
>> > RFC: This implies only patched qemu-trad or ioreq-server-aware
>> >      qemu-upstream get used with xen-unstable. Is this reasonable?
>> 
>> Patched qemu-trad, yes, as it comes from the same source.
>> 
>> Much less certain about qemu-upstream.  There is deliberate support to
>> use a distro provided qemu-upstream as opposed to a xen provided one.
>  
> That's right. Distros are free to mix and match upstream QEMU and Xen
> versions.

Sigh. So to avoid adding an interface just for qemu-trad to use -
is there a way to reliably tell a non-ioreq-server-aware upstream
qemu from qemu-trad inside the hypervisor?

Jan


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