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Re: [Xen-devel] [PATCH 00/11] Fixes to debugging facilities


  • To: Xen-devel <xen-devel@xxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Mon, 4 Jun 2018 16:39:29 +0100
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  • Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Brian Woods <brian.woods@xxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Mon, 04 Jun 2018 15:39:50 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 04/06/18 14:59, Andrew Cooper wrote:
> So this started as a small fix for the vmentry failure (penultimate patch),
> and has snowballed...
>
> I'm fairly confident that everything involving DEBUGCTL.BTF is broken, and
> there are definitely bugs with configuring DEBUGCTL.RTM (which really isn't
> helped by the fact that the GCC TSX intrinsics render the resulting code
> un-debuggable.)  I'll defer fixing these swamps for now.
>
> The first 4 patches probably want backporting to the stable trees, so I've
> taken care to move them ahead of patch 6 for backport reasons.  While all
> fixes would ideally be backported, I can't find a way of fixing %dr6 merging
> (as it needs to be done precicely once) without a behavioural change in the
> monitor subsystem.
>
> Patch 8 probably breaks introspection, so can't be taken at this point.  See
> that patch for discussion of the problem and my best guess at a solution.

As spotted by Razvan, I forgot to mention that this series is built on
top of "x86/vmx: Fix handing of MSR_DEBUGCTL on VMExit".  It can be
found in git form here:

http://xenbits.xen.org/gitweb/?p=people/andrewcoop/xen.git;a=shortlog;h=refs/heads/debug-fixes-v1

~Andrew

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