Re: [Xen-devel] Regression between Xen 4.6.0 and 4.7.0, Direct kernel boot on a qemu-xen and seabios HVM guest doesn't work anymore.

[linux@xxxxxxxxxxxxxx]

On 2016-09-05 11:46, Jan Beulich wrote:
> > > > On 05.09.16 at 11:20, <linux@xxxxxxxxxxxxxx> wrote:
> > Hmm it seems my thread was kind of hijacked and i was dropped from the
> > CC.
> >
> > I had some time and bisected the issue and it resulted in:
> >
> > 5a3ce8f85e7e7bdd339d259daa19f6bc5cb4735f is the first bad commit
> > commit 5a3ce8f85e7e7bdd339d259daa19f6bc5cb4735f
> > Author: Jan Beulich <jbeulich@xxxxxxxx>
> > Date:   Wed Oct 21 10:56:31 2015 +0200
> >
> >      x86/shadow: drop stray name tags from 
> > sh_{guest_get,map}_eff_l1e()
> Hmm, as Wei already indicated - that's rather odd. The commit isn't
> really supposed to have any effect on functionality (and going
> through it again I also can't spot any now). And are you indeed
> using shadow mode, and if so does your problem not occur when
> you use HAP instead?
>
> In any event, if there was some hidden (and unintended) change
> in functionality here, then the most likely result would seem to be
> a crash, yet from the log fragment you posted it doesn't look like
> there's _any_ relevant hypervisor output.
>
> Jan
Hmm i was already afraid of that.
Attached is the output of xl dmesg, HAP is supported and should be 
enabled by default (and i didn't disable it explicitly in my guest.cfg).
I just tried the opposite and specified hap=0 in my guest.cfg and this 
case leads to 2 lines of additional output:
XEN) [2016-09-05 09:58:22.201] sh error: sh_remove_all_mappings(): can't 
find all mappings of mfn 471b69: c=8000000000000003 t=7400000000000001
(XEN) [2016-09-05 09:58:22.201] sh error: sh_remove_all_mappings(): 
can't find all mappings of mfn 471b68: c=8000000000000003 
t=7400000000000001
(XEN) [2016-09-05 09:58:22.334] d0v5 Over-allocation for domain 3: 
262401 > 262400
(XEN) [2016-09-05 09:58:22.334] memory.c:163:d0v5 Could not allocate 
order=0 extent: id=3 memflags=0 (192 of 512)
--
Sander

Attachment: xl-dmesg.txt
Description: Text document

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