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Re: [PATCH 0/5] Fixes to debugging facilities
- To: Jinoh Kang <jinoh.kang.kr@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 22 Aug 2023 08:16:49 +0200
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- Cc: Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Tue, 22 Aug 2023 06:16:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21.08.2023 17:55, Jinoh Kang wrote:
> This is a rebased version of Andrew Cooper's debugging facilities patch:
> https://lore.kernel.org/xen-devel/1528120755-17455-1-git-send-email-andrew.cooper3@xxxxxxxxxx/
>
>> 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.
>
> 6 out of 11 patches from the 2018 patch series above, including the
> vmentry failure fix, have already been committed. This covers the
> remaining 5 patches.
One important formal question: Where did Andrew's S-o-b go on all of the
patches?
Jan
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