Re: [Xen-devel] QEMU 2.2.0 in Xen 4.6

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 23 Jan 2015, Eric Shelton wrote:
> On Jan 23, 2015 10:10 AM, "Stefano Stabellini" 
> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> >
> > On Fri, 23 Jan 2015, Ian Campbell wrote:
> > > On Fri, 2015-01-23 at 14:42 +0000, Stefano Stabellini wrote:
> > >
> > > > HVM guest ---------(PV)----------> QEMU in Dom0 for guest
> > > >Â Â Â|
> > > >Â Â Â--(emulation)--> QEMU Stubdom-(syscall)->Linux Stubdom---(PV)--> 
> > > >QEMU Dom0 for stubdom
> > >
> > > Here, and throughout what you said I think, "QEMU in Dom0 for guest"
> > > could equally well be e.g. "blkback in driver domain for guest" likewise
> > > the "... for stubdom" too.
> > >
> > > i.e. the PV backend for the stubdom or the guest doesn't necessarily
> > > need to be QEMU and doesn't necessarily need to be in dom0.
> >
> > Indeed
> >
> 
> Thank you both.
> 
> There is one other thing that would be helpful to understand. Anthony had to 
> patch the Linux kernel running in the stubdom to
> allow memory mapping. What mappings are needed between dom0 and the stub 
> domain, and between the stub domain and the HVM guest
> domain? I am guessing this comes into play for the display, as it seems that 
> the dom0 qemu instance is running the VNC server.

I don't remember the details of it anymore. CC'ing Anthony that might
have a better idea.

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