BUG: FreeBSD fails to boot on xen-unstable tip

BUG: FreeBSD fails to boot on xen-unstable tip

[Roger Pau Monné]

Hello,

FreeBSD bootloader is getting stuck with tip of xen-unstable. I've
bisected the Xen tree and found that the culprit of this is the
following commit:

527824f41f5fac9cba3d4441b2e73d3118d98837 is the first bad commit
commit 527824f41f5fac9cba3d4441b2e73d3118d98837
Author: Tim Deegan <tim@xen.org>
Date:   Thu Mar 28 11:27:31 2013 +0000

    x86/hvm: Centralize and simplify the RTC IRQ logic.

    This keeps the behaviour of strobing the IRQ line every time any RTC
    interrupt source is raised.  I rather suspect (based on the behaviour
    of the MC146818A RTC) that we ought to be suppressing all subsequent
    interrupts whenever RTC_IRQF is set, but this way avoids making
    guest-visible changes.

    Signed-off-by: Tim Deegan <tim@xen.org>
    Acked-by: Jan Beulich <jbeulich@suse.com>
    Acked-by: Keir Fraser <keir@xen.org>

Not sure, but I guess this is probably related to the issues George is
seeing on Windows 2003:

<CAFLBxZbaggssHmQFpEkreFDsqdu3XPDqd1k4fXQb9k=qSXjMcw@mail.gmail.com>

Roger.

Re: BUG: FreeBSD fails to boot on xen-unstable tip

[Jan Beulich]

>>> On 18.04.13 at 13:36, Roger Pau Monné<roger.pau@citrix.com> wrote:
> Hello,
> 
> FreeBSD bootloader is getting stuck with tip of xen-unstable. I've
> bisected the Xen tree and found that the culprit of this is the
> following commit:
> 
> 527824f41f5fac9cba3d4441b2e73d3118d98837 is the first bad commit
> commit 527824f41f5fac9cba3d4441b2e73d3118d98837
> Author: Tim Deegan <tim@xen.org>
> Date:   Thu Mar 28 11:27:31 2013 +0000
> 
>     x86/hvm: Centralize and simplify the RTC IRQ logic.
> 
>     This keeps the behaviour of strobing the IRQ line every time any RTC
>     interrupt source is raised.  I rather suspect (based on the behaviour
>     of the MC146818A RTC) that we ought to be suppressing all subsequent
>     interrupts whenever RTC_IRQF is set, but this way avoids making
>     guest-visible changes.
> 
>     Signed-off-by: Tim Deegan <tim@xen.org>
>     Acked-by: Jan Beulich <jbeulich@suse.com>
>     Acked-by: Keir Fraser <keir@xen.org>
> 
> Not sure, but I guess this is probably related to the issues George is
> seeing on Windows 2003:
> 
> <CAFLBxZbaggssHmQFpEkreFDsqdu3XPDqd1k4fXQb9k=qSXjMcw@mail.gmail.com>

But George is seeing his issue with a much earlier commit, so the
connection can only be relatively weak.

But both together suggest to me that perhaps a debugging patch
for both of you to try might be more useful at this point than a
partial revert of the bad commit he spotted. Maybe later today,
or if not, then hopefully tomorrow...

Jan

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