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Re: [PATCH for-4.22? 9/9] x86/HVM: more checking for XEN_DOMCTL_ioport_mapping
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 16 Jun 2026 12:07:01 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- Delivery-date: Tue, 16 Jun 2026 10:07:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.06.2026 12:01, Roger Pau Monné wrote:
> On Mon, Jun 15, 2026 at 04:16:41PM +0200, Jan Beulich wrote:
>> When adding ranges, only alter existing ones when there is an exact match.
>> Don't accept ranges overlapping existing ones.
>>
>> When removing ranges, only remove a range if there's an exact match.
>> Return an error when the range isn't found, and also don't call
>> ioports_deny_access() in that case.
>
> Isn't the ioports_deny_access() part stale now? As you remove the
> permission adjustments in patch 8/9.
Oh, indeed. Dropped that last half sentence.
>> Fixes: 192c4dabc344 ("domctl and p2m changes for PCI passthru")
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks.
>> ---
>> Should "exact match" perhaps also include the guest port number? I'm
>> uncertain here as that kind of conflicts with "add" being treated as
>> "change" when the host port (and now count) match.
>
> I think we want to keep the existing behavior and allow using an add
> operation to change the guest port.
Okay.
Jan
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