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* Status of FLR in Xen 4.4
@ 2013-09-26 16:05 Matthias
  2013-09-26 16:16 ` Ian Campbell
  2013-09-26 16:20 ` David Vrabel
  0 siblings, 2 replies; 23+ messages in thread
From: Matthias @ 2013-09-26 16:05 UTC (permalink / raw)
  To: xen-devel@lists.xen.org


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Hi everyone,

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.

I'm asking because with xl (latest build and traditional qemu, not
upstream), I always had problems with rebooting domUs which have vga cards
passed through to them, because appearently they don't get reinitialized
and then cause either bluescreens (windows), blackscreens (linux) or the
complete freeze of the dom0. As far as I understood this is caused by the
vga card do not have FLR capability (lspci -vvv shows FLReset-). So while
lately rebooting sometimes works on windows, it never works on linux domUs
and it appears that xl is simply not really capable of dealing with reboots
with non-FLR'ed vga cards passed through the domUs and I have to reboot the
dom0 to get the vga cards running again.

Is this the current status or is this supposed to work and I only have a
problem on my setup?

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.

It would be great to have a quick roundup of the current situation and
future plans, because I'm planing a project to use xen's vga passthrough in
a cloud / big data setup and the unreliable reboot behaviour is currently a
deal breaker for me.

Thanks in advance!

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^ permalink raw reply	[flat|nested] 23+ messages in thread
end of thread, other threads:[~2013-10-04  6:07 UTC | newest]

Thread overview: 23+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-09-26 16:05 Status of FLR in Xen 4.4 Matthias
2013-09-26 16:16 ` Ian Campbell
2013-09-26 17:59   ` Matthias
2013-09-27 13:34     ` Konrad Rzeszutek Wilk
2013-09-27 17:07       ` Matthias
2013-09-27 17:28         ` Sander Eikelenboom
2013-09-27 19:19           ` Matthias
2013-09-27 19:33             ` Sander Eikelenboom
2013-09-27 19:48               ` Matthias
2013-09-27 20:06                 ` Sander Eikelenboom
2013-09-27 17:53         ` Is: RCU callback detects an RCU hang with Linux 3.12+ Was: " Konrad Rzeszutek Wilk
2013-10-03 22:34           ` Matthias
2013-10-04  6:07             ` Pasi Kärkkäinen
2013-09-26 16:20 ` David Vrabel
2013-09-26 17:48   ` Ross Philipson
2013-09-26 18:01     ` David Vrabel
2013-09-26 18:41       ` Matthias
2013-09-26 19:13         ` Gordan Bobic
2013-09-27 12:26           ` Matthias
2013-09-27 13:27             ` Gordan Bobic
2013-09-27 13:48               ` Konrad Rzeszutek Wilk
2013-09-27 14:00                 ` Gordan Bobic
2013-10-03 22:20       ` Matthias

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