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Re: [Xen-devel] Status of FLR in Xen 4.4

On Thu, 2013-09-26 at 18:05 +0200, Matthias wrote:

> I would like to ask what the current status of FLR, or better of FLR
> emulation is in latest Xen and if we can expect better support in the
> future.
> Is this the current status or is this supposed to work and I only have
> a problem on my setup?

xl simply asks the dom0 kernel to reset the card, so this is entirely
dependent on the functionality of your dom0 kernel and/or the features
of the particular hardware WRT allowing things to be reset.

> Also, I'm specifically referring to xl because back in the day when I
> used xm with xen 4.0 and 4.1, this never was an issue and i could
> reboot both linux and windows domUs without issues as often as I
> wanted (with the same hardware setup I now use with xl). So to me it
> seems that there is a possibility to handle non-FLR'ed vga cards
> gracefully, but xl simply isn't capable of that / does not do that.

This I'm afraid I don't know enough about to comment much.

tools/python/xen/util/pci.py appears to implement various FLR quirks for
bits of hardware, including some GFX from the looks of things.

These all belong in the upstream Linux kernel these days. You don't say
which kernel you are using but you could try updating it.

You could also check the kernel source for a quirk for your particular


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