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Re: [PATCH v4] x86: detect CMOS aliasing on ports other than 0x70/0x71
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 27 Mar 2023 17:44:25 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Paul Durrant <paul@xxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Mon, 27 Mar 2023 15:44:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21.03.2023 15:12, Roger Pau Monné wrote:
> On Mon, Mar 20, 2023 at 09:32:26AM +0100, Jan Beulich wrote:
>> ... in order to also intercept Dom0 accesses through the alias ports.
>
> I'm trying to get some documentation about this aliasing, but so far I
> haven't been able to find any. Do you have any references of where I
> might be able to find it?
>
>> Also stop intercepting accesses to the CMOS ports if we won't ourselves
>> use the CMOS RTC.
>
> Could this create any concerns with the ability to disable NMIs if we
> no longer filter accesses to the RTC?
I've added "..., because of there being none." If there's no RTC, I don't
think it's specified what function (if any) port 70 bit 7 has.
Jan
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