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Re: [PATCH 0/4] x86/PVH: Dom0 building adjustments

  • To: Jan Beulich <jbeulich@xxxxxxxx>
  • From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Date: Wed, 1 Sep 2021 15:56:40 +0200
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On Tue, Aug 31, 2021 at 10:53:59AM +0200, Jan Beulich wrote:
> On 30.08.2021 15:01, Jan Beulich wrote:
> > The code building PVH Dom0 made use of sequences of P2M changes
> > which are disallowed as of XSA-378. First of all population of the
> > first Mb of memory needs to be redone. Then, largely as a
> > workaround, checking introduced by XSA-378 needs to be slightly
> > relaxed.
> > 
> > Note that with these adjustments I get Dom0 to start booting on my
> > development system, but the Dom0 kernel then gets stuck. Since it
> > was the first time for me to try PVH Dom0 in this context (see
> > below for why I was hesitant), I cannot tell yet whether this is
> > due further fallout from the XSA, or some further unrelated
> > problem.

Iff you have some time could you check without the XSA applied? I have
to admit I haven't been testing staging, so it's possible some
breakage as slipped in (however osstest seemed fine with it).

> > Dom0's BSP is in VPF_blocked state while all APs are
> > still in VPF_down. The 'd' debug key, unhelpfully, doesn't produce
> > any output, so it's non-trivial to check whether (like PV likes to
> > do) Dom0 has panic()ed without leaving any (visible) output.

Not sure it would help much, but maybe you can post the Xen+Linux

Do you have iommu debug/verbose enabled to catch iommu faults?

> Correction: I did mean '0' here, producing merely
> (XEN) '0' pressed -> dumping Dom0's registers
> (XEN) *** Dumping Dom0 vcpu#0 state: ***
> (XEN) *** Dumping Dom0 vcpu#1 state: ***
> (XEN) *** Dumping Dom0 vcpu#2 state: ***
> (XEN) *** Dumping Dom0 vcpu#3 state: ***
> 'd' output supports the "system is idle" that was also visible from
> 'q' output.

Can you dump the state of the VMCS and see where the IP points to in

Thanks, Roger.



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