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

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH 2/2] hw/pci-host/x86: extend the 64-bit PCI hole relative to the fw-assigned base
Date: Thu, 27 Sep 2018 09:50:05 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0

On 9/27/18 4:21 AM, Laszlo Ersek wrote:
On 09/27/18 07:48, Gerd Hoffmann wrote:

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

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