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Re: [RFC KERNEL PATCH v6 3/3] xen/privcmd: Add new syscall to get gsi from irq
- To: Jürgen Groß <jgross@xxxxxxxx>
- From: "Chen, Jiqian" <Jiqian.Chen@xxxxxxx>
- Date: Fri, 10 May 2024 10:13:50 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, "Rafael J . Wysocki" <rafael@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "linux-pci@xxxxxxxxxxxxxxx" <linux-pci@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-acpi@xxxxxxxxxxxxxxx" <linux-acpi@xxxxxxxxxxxxxxx>, "Huang, Ray" <Ray.Huang@xxxxxxx>, "Chen, Jiqian" <Jiqian.Chen@xxxxxxx>
- Delivery-date: Fri, 10 May 2024 10:13:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHakgrPZQMiHHEzE0Gs/TUOGsHh17GQJ2yAgACnAgD//41hgIAAiXAA
- Thread-topic: [RFC KERNEL PATCH v6 3/3] xen/privcmd: Add new syscall to get gsi from irq
On 2024/5/10 17:53, Jürgen Groß wrote:
> On 10.05.24 11:06, Chen, Jiqian wrote:
>> Hi,
>>
>> On 2024/5/10 14:46, Jürgen Groß wrote:
>>> On 19.04.24 05:36, Jiqian Chen wrote:
>>>> +
>>>> + info->type = IRQT_PIRQ;
>> I am considering whether I need to use a new type(like IRQT_GSI) here to
>> distinguish with IRQT_PIRQ, because function restore_pirqs will process all
>> IRQT_PIRQ.
>
> restore_pirqs() already considers gsi == 0 to be not GSI related. Isn't this
> enough?
No, it is not enough.
xen_pvh_add_gsi_irq_map adds the mapping of gsi and irq, but the value of gsi
is not 0,
once restore_pirqs is called, it will do PHYSDEVOP_map_pirq for that gsi, but
in pvh dom0, we shouldn't do PHYSDEVOP_map_pirq.
>
>
> Juergen
--
Best regards,
Jiqian Chen.
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