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Re: [Xen-devel] Xen 4.4 development update, qemu pci hole start address

On 08/10/13 19:13, Pasi Kärkkäinen wrote:
On Tue, Oct 08, 2013 at 09:05:55PM +0300, Pasi Kärkkäinen wrote:
On Thu, Sep 26, 2013 at 05:47:40PM +0100, George Dunlap wrote:

"quick" workaround was proposed for Xen 4.3 release, and the "proper" solution
to be done later for Xen 4.4. Is that still the case? Does this issue still 
need to be resolved?

Quote from the above email/url, Stefano writing:

"this is what I would do:

1) modify upstream QEMU to start the PCI hole at 0xe0000000, to match
qemu-xen-unstable in terms of configuration and not to introduce any
regressions. Do this for the Xen 4.3 release.

2) for Xen 4.4 rework the two patches above and improve
i440fx_update_pci_mem_hole: resizing the pci_hole subregion is not
enough, it also needs to be able to resize the system memory region
(xen.ram) to make room for the bigger pci_hole"

Hmm, or maybe this series fixed the issue already properly for Xen 4.3.0?

No, this series is still a work-around; see 8/8 of that series: "It's too late in the release to do a proper fix, so we try to do damage control." It is fairly likely that there are OS / device combinations that currently will not work for PCI pass-through, because either the OS, the driver, or the device won't work when relocated into 64-bit PCI space.

(I think the problem Gordan has been working on might be related, but I'm not sure.)

So yes, good catch -- there should still be an outstanding issue related to qemu-xen.


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