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[Xen-devel] Re: [PATCH] xen-upstream-qemu: get vncpassword through xenst

To: ZhouPeng <zpengxen@xxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH] xen-upstream-qemu: get vncpassword through xenstore, enable VNC_AUTH_VNC
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Thu, 21 Apr 2011 12:30:30 +0100
Cc: "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, "qemu-devel@xxxxxxxxxx" <qemu-devel@xxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
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On Thu, 21 Apr 2011, ZhouPeng wrote:
> Thank you for your review.
> Does this means the xen-upsteam-qemu will give up xenstore?
> Many features of xen except for vncpasswd
> may need that xl send||receive msg to||from xen-qemu.
> I think some other part of xen may need to read xenstore which may be
> updated by qemu.
> xenstore's sharing characteristic give much convenience for many-way
> msg communication,
> but the RPC may only give single-way.
> So I am somewhat in doubt xen-upstream-qemu will give up xenstore.
> IMO, I don't think qemu may accept xenstore's code only used by xen,
> except
> qemu need to add a new general shared many-way msg exchange mechanism,
> like xenstore database.

Even though a "QMP bus" could be useful, I don't think there is anything
like that at the moment.
Also considering that each qemu instance takes care of a single guest,
the usefulness of such a mechanism is reduced.

Anyhow in this particular case using QMP seems appropriate: I would
welcome patches to add QMP support to libxenlight, even though I realize
that it is a bigger effort than this single patch.

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