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Re: [PATCH 1/7] x86: don't allow Dom0 access to port CF9
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 25 Oct 2023 15:59:31 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Wed, 25 Oct 2023 13:59:39 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.10.2023 14:36, Roger Pau Monné wrote:
> On Thu, May 11, 2023 at 02:05:11PM +0200, Jan Beulich wrote:
>> This allows to initiate machine reset, which we don't want to permit
>> Dom0 to invoke that way.
>>
>> While there insert blank lines and convert the sibling PCI config space
>> port numbers to upper case, matching style earlier in the function.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks.
> Should we also do something about port 0x64?
That would be more involved, as its reset (and A20) functionality is
only a small subset of what it is used for. IOW we'd have to intercept
accesses and pass through the majority of the operations.
Jan
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