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Re: [RFC XEN PATCH v15 3/4] tools: Add new function to get gsi from dev
- To: Jiqian Chen <Jiqian.Chen@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 11 Sep 2024 12:51:33 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony@xxxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "Daniel P . Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Huang Rui <ray.huang@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 11 Sep 2024 10:51:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.09.2024 12:49, Jan Beulich wrote:
> On 11.09.2024 08:58, Jiqian Chen wrote:
>> On PVH dom0, when passthrough a device to domU, QEMU and xl tools
>> want to use gsi number to do pirq mapping, see QEMU code
>> xen_pt_realize->xc_physdev_map_pirq, and xl code
>> pci_add_dm_done->xc_physdev_map_pirq, but in current codes, the gsi
>> number is got from file /sys/bus/pci/devices/<sbdf>/irq, that is
>> wrong, because irq is not equal with gsi, they are in different
>> spaces, so pirq mapping fails.
>>
>> And in current codes, there is no method to get gsi for userspace.
>> For above purpose, add new function to get gsi, and the
>> corresponding ioctl is implemented on linux kernel side.
>>
>> Signed-off-by: Jiqian Chen <Jiqian.Chen@xxxxxxx>
>> Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
>> Signed-off-by: Chen Jiqian <Jiqian.Chen@xxxxxxx>
>> Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
>> ---
>> RFC: it needs to wait for the corresponding third patch on linux kernel side
>> to be merged.
>> https://lore.kernel.org/xen-devel/20240607075109.126277-4-Jiqian.Chen@xxxxxxx/
>
> I'm afraid I don't understand this remark: The change here (and similarly
> patch 4) ought to be independent of when the kernel change goes in. After
> all the libraries need to work on older Linux as well. Please clarify.
Hmm, maybe for this patch the dependency is for the new IOCTL as an
interface to be accepted. That's fine a dependency of course. Yet then
why the same remark in patch 4?
Jan
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