Re: [PATCH for-4.22? 9/9] x86/HVM: more checking for XEN_DOMCTL_ioport_mapping

["Roger Pau Monné" <roger.pau@citrix.com>]

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.

> Fixes: 192c4dabc344 ("domctl and p2m changes for PCI passthru")
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Acked-by: Roger Pau Monné <roger.pau@citrix.com>

> ---
> 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.

Thanks, Roger.