Re: [Qemu-devel] [PATCH 2/2] hw/pci-host/x86: extend the 64-bit PCI hole relative to the fw-assigned base

[Eric Blake]

On 9/27/18 4:21 AM, Laszlo Ersek wrote:
> On 09/27/18 07:48, Gerd Hoffmann wrote:
> >    Hi,
> >
> > > > Maybe using memdev file backend with manually created sparse file
> > > > might actually work (with preallocate disabled)
> > >
> > > Thanks, this sounds like a good idea.
> > >
> > > I see shm_open() is used heavily in ivshmem-related tests. I haven't
> > > looked much at shm_open() before. (I've always known it existed in
> > > POSIX, but I've never cared.)
> >
> > How about improving the lovely pci-testdev we have a bit?  Then we can
> > have huge pci bars without needing backing storage for them ...
>
> Earlier I checked
>
>    qemu-system-x86_64 -device pci-testdev,\?

Side note: While that works, we are trying to shift the documentation 
over to recommending -device pci-testdev,help instead, as then you don't 
need to remember to shell-quote the ? to prevent unintended globbing.

--
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org