Re: [Xen-devel] [PATCH 0/7] Optionally add libvchan to stubdom

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 26/04/13 15:56, Marek Marczykowski wrote:
> On 26.04.2013 16:55, George Dunlap wrote:
> > On Fri, Apr 26, 2013 at 3:45 PM, Marek Marczykowski
> > <marmarek@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> > > This patch series enhances stubdomain with libvchan. It is disabled by default,
> > > but can be easily enabled in mini-os.cfg when needed.
> > > In order to do so, some parts of minios needs to be extended:
> > >   - xenstore (to support transactions)
> > >   - libxc - to support xc_gntshr
> > >
> > > This series assumes "libxc: fix xc_gntshr_munmap" already applied.
> > >
> > > One unsolved problem is implementation of xc_gntshr_share_page_notify. On Linux,
> > > there is kernel, which can notify remote in case of server process death. In
> > > stubdom there is no such place - if exit() is called anywhere, the whole
> > > stubdom is terminated. Also the common case is stubdom destruction (the case
> > > for ioemu stubdom - it is destroyed by toolstack at domain shutdown), I don't
> > > know if stubdom even support clean shutdown.
> > > Anyway I can implement some notification (which needs some additional info
> > > stored by minios version of gnttab), just for clean libxenvchan_close(). But it
> > > is rather rare case.
> > > Some workaround can be checking for domain state at client side, but IMHO it
> > > isn't the best way (although still used in original Qubes OS vchan version).
> > > Any ideas?
> > >
> > > Patch 2 is independent - should be also useful for normal Linux case.
> > I assume your targeting this for 4.4?
> Probably yes, I assume it is too late for 4.3, right?
Unless you've got a really amazing justification, yes. :-)

 -George

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