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Re: [Xen-devel] [PATCH] xen: introduce HVM_PARAM_BUFIOREQ_EVTCHN

from [Stefano Stabellini]

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To:	Keir Fraser <keir@xxxxxxx>
Subject:	Re: [Xen-devel] [PATCH] xen: introduce HVM_PARAM_BUFIOREQ_EVTCHN
From:	Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date:	Tue, 15 Nov 2011 16:57:49 +0000
Cc:	"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
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On Tue, 15 Nov 2011, Keir Fraser wrote:
> On 15/11/2011 13:53, "Stefano Stabellini" <Stefano.Stabellini@xxxxxxxxxxxxx>
> wrote:
> 
> > From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> > 
> > Introduce an event channel for buffered io event notifications,
> > advertise the port number using an hvm param.
> > This way the device model is not forced to check the buffered io page
> > for data several times a second for the entire life of the VM (buffered
> > io is mostly used for stdvga emulation in Xen that is switched off after
> > the guest goes into graphical mode).
> 
> It doesn't look like this evtchn can be allocated and specified from outside
> the hypervisor. Hence HVMOP_set_param(BUFIOREQ_EVTCHN) should fail with
> -EINVAL or similar.

Yes, good idea.

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