Re: [Xen-devel] Re: PCI passthrough stopped working, brainache!

[Andy Burns <xen.lists@xxxxxxxxxxx>]

Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:

> So it works now right?

No.  When I went to bed last night I was convinced it was working,
having seen it work three times in a row where it hadn't at all for
the past 24 hours, albeit not knowing why serial console should make
it work.

I left the machines updating to latest Fedora16 branch, but this
morning it's not working again.

> Did you turn off the machine in between your
> reboots - when you went back from CentOS to F16?

I've not booted CentOS for a few weeks now, machine has certainly been
physically powered off since then,both when working and when faiing.

I do know that for the test above where I posted dmesg results as
requested by Ian, the machine was physically powered off and
passthrough  failed.

I didn't turn the machine physically off for every test, sometimes I
rebooted it from within the dom0, sometimes powered it down to S5
state (which doesn't always work) and re-woke with WOL, sometimes it
hung and  I used the reset button, sometines it hung and I'd press and
hold the power button.

> I did encounter a bug where it would program an hardware interface
> that would retain its state after a reboot and cause the newly built kernel
> to go wrongly. Spent couple of good days trying to narrow that one down

I'll make sure I always physically turn it off until I find the true
cause, back to older  hypervisor and kernel packages again for more
tests ...

I think I remember what was the test I did before the boot that
started working again , but honestly can't remember whether I rebooted
or powered off after that.

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