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Re: [RFC XEN PATCH v4 4/5] domctl: Use gsi to grant/revoke irq permission
- To: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Jiqian Chen <Jiqian.Chen@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 8 Jan 2024 09:55:26 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stewart Hildebrand <Stewart.Hildebrand@xxxxxxx>, Huang Rui <Ray.Huang@xxxxxxx>
- Delivery-date: Mon, 08 Jan 2024 08:55:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.01.2024 02:08, Stefano Stabellini wrote:
> On Fri, 5 Jan 2024, Jiqian Chen wrote:
>> --- a/tools/libs/light/libxl_pci.c
>> +++ b/tools/libs/light/libxl_pci.c
>> @@ -1418,6 +1418,7 @@ static void pci_add_dm_done(libxl__egc *egc,
>> unsigned long long start, end, flags, size;
>> int irq, i;
>> int r;
>> + int gsi;
>> uint32_t flag = XEN_DOMCTL_DEV_RDM_RELAXED;
>> uint32_t domainid = domid;
>> bool isstubdom = libxl_is_stubdom(ctx, domid, &domainid);
>> @@ -1486,6 +1487,7 @@ static void pci_add_dm_done(libxl__egc *egc,
>> goto out_no_irq;
>> }
>> if ((fscanf(f, "%u", &irq) == 1) && irq) {
>> + gsi = irq;
>
> A question for Roger and Jan: are we always guaranteed that gsi == irq
> (also in the PV case)?
Iirc for IO-APIC based IRQs that's always the case; for MSI ones there
simply is no GSI, and Xen's IRQ number then normally isn't the same as
the pIRQ a domain would see.
Jan
|
