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Re: [PATCH for-4.19???] x86/physdev: replace physdev_{,un}map_pirq() checking against DOMID_SELF
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 12 Jun 2024 13:46:54 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Chen Jiqian <Jiqian.Chen@xxxxxxx>
- Delivery-date: Wed, 12 Jun 2024 11:47:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.06.2024 12:52, Roger Pau Monné wrote:
> On Wed, Jun 12, 2024 at 10:44:56AM +0200, Jan Beulich wrote:
>> It's hardly ever correct to check for just DOMID_SELF, as guests have
>> ways to figure out their domain IDs and hence could instead use those as
>> inputs to respective hypercalls. Note, however, that for ordinary DomU-s
>> the adjustment is relaxing things rather than tightening them, since
>> - as a result of XSA-237 - the respective XSM checks would have rejected
>> self (un)mapping attempts for other than the control domain.
>>
>> Since in physdev_map_pirq() handling overall is a little easier this
>> way, move obtaining of the domain pointer into the caller. Doing the
>> same for physdev_unmap_pirq() is just to keep both consistent in this
>> regard. For both this has the advantage that it is now provable (by the
>> build not failing) that there are no DOMID_SELF checks left (and none
>> could easily be re-added).
>>
>> Fixes: 0b469cd68708 ("Interrupt remapping to PIRQs in HVM guests")
>> Fixes: 9e1a3415b773 ("x86: fixes after emuirq changes")
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks.
> I wonder if we should introduce a helper to check for the current
> domain:
>
> #define is_current_domain(d) ((d) == current->domain)
Hmm, that's not even shorter, and imo not any more "meaningful". Plus
it wouldn't cover the case where we have currd already in a local var.
Jan
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