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Re: [PATCH 0/5] x86/pv: #DB vs %dr6 fixes, part 2
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 18 Sep 2023 11:45:10 +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: Mon, 18 Sep 2023 09:45:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.09.2023 21:56, Andrew Cooper wrote:
> A third which I'm on the fence about is about PV guests and General
> Detect. We firmly prohibit PV guests from setting DR7.GD, but we them
> play with the DR6.GD bit as if it had been asserted.
>
> It would be easy to put GD back into the set of reserved bits for DR6,
> but it also wouldn't be hard to handle GD via dr7_emul and let the PV
> guest have a more-normal looking set of debug functionality.
Anything "more-normal looking" is to be preferred, I would say. As long
as, like you say here, it isn't overly hard.
Jan
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