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Re: [PATCH v2 19/26] xen/riscv: implement IRQ routing for device passthrough
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 5 Jun 2026 09:38:05 +0200
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- Cc: Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 05 Jun 2026 07:38:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.06.2026 17:35, Oleksii Kurochko wrote:
> On 6/3/26 6:01 PM, Jan Beulich wrote:
>> On 08.05.2026 16:43, Oleksii Kurochko wrote:
>>> @@ -86,6 +88,22 @@ unsigned int intc_irq_nums(void)
>>> return intc_hw_ops->irq_nums();
>>> }
>>>
>>> +int intc_route_irq_to_guest(struct irq_desc *desc,
>>> + unsigned int priority)
>>> +{
>>> + ASSERT(spin_is_locked(&desc->lock));
>>> +
>>> + ASSERT(intc_hw_ops->guest_irq_type);
>>> +
>>> + desc->handler = intc_hw_ops->guest_irq_type;
>>> + set_bit(_IRQ_GUEST, &desc->status);
>>
>> Is desc->status accessed anywhere without holding desc->lock? If not,
>> __set_bit() or simply |= ?
>
> In release_irq() it could be used without lock:
> ...
> /* Wait to make sure it's not being used on another CPU */
> do { smp_mb(); } while ( test_bit(_IRQ_INPROGRESS, &desc->status) );
That's fine with the update being non-atomic. I probably should have said
"modified" instead of "accessed".
Jan
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