linux-kernel - Re: [RFC KERNEL PATCH v6 3/3] xen/privcmd: Add new syscall to get gsi from irq

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Date: Fri, 10 May 2024 10:13:50 +0000
From: "Chen, Jiqian" <Jiqian.Chen@....com>
To: Jürgen Groß <jgross@...e.com>
CC: Stefano Stabellini <sstabellini@...nel.org>, Bjorn Helgaas
	<bhelgaas@...gle.com>, "Rafael J . Wysocki" <rafael@...nel.org>,
	Roger Pau Monné <roger.pau@...rix.com>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, "Huang, Ray"
	<Ray.Huang@....com>, "Chen, Jiqian" <Jiqian.Chen@....com>
Subject: Re: [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.