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Re: [PATCH 2/5] x86: Introduce x86_merge_dr6()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 14 Sep 2023 16:53:24 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jinoh Kang <jinoh.kang.kr@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 14 Sep 2023 14:53:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.09.2023 01:21, Andrew Cooper wrote:
> The current logic used to update %dr6 when injecting #DB is buggy. The
> architectural behaviour is to overwrite B{0..3} and accumulate all other bits.
While I consider this behavior plausible, forever since the introduction of
debug registers in i386 I have been missing a description in the manuals of
how %dr6 updating works. Can you point me at where the above is actually
spelled out?
Jan
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