linux-kernel - Re: [PATCH v3 06/14] iommufd: Add IOMMUFD_OBJ_VIRQ and IOMMUFD_CMD_VIRQ

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Message-ID: <Z3dZzXblPIlxXEQ+@Asurada-Nvidia>
Date: Thu, 2 Jan 2025 19:30:21 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <kevin.tian@...el.com>, <will@...nel.org>, <corbet@....net>,
	<joro@...tes.org>, <suravee.suthikulpanit@....com>, <robin.murphy@....com>,
	<dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>, <shuah@...nel.org>,
	<linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <eric.auger@...hat.com>,
	<jean-philippe@...aro.org>, <mdf@...nel.org>, <mshavit@...gle.com>,
	<shameerali.kolothum.thodi@...wei.com>, <smostafa@...gle.com>,
	<ddutile@...hat.com>, <yi.l.liu@...el.com>, <patches@...ts.linux.dev>
Subject: Re: [PATCH v3 06/14] iommufd: Add IOMMUFD_OBJ_VIRQ and
 IOMMUFD_CMD_VIRQ_ALLOC

On Thu, Jan 02, 2025 at 04:52:46PM -0400, Jason Gunthorpe wrote:
> On Tue, Dec 17, 2024 at 09:00:19PM -0800, Nicolin Chen wrote:
> > +/* An iommufd_virq_header packs a vIOMMU interrupt in an iommufd_virq queue */
> > +struct iommufd_virq_header {
> > +	struct list_head node;
> > +	ssize_t irq_len;
> > +	void *irq_data;
> > +};
> 
> Based on how it is used in iommufd_viommu_report_irq()
> 
> +       header = kzalloc(sizeof(*header) + irq_len, GFP_KERNEL);
> +       header->irq_data = (void *)header + sizeof(*header);
> +       memcpy(header->irq_data, irq_ptr, irq_len);
> 
> It should be a flex array and use the various flexarray tools
> 
> struct iommufd_virq_header {
>        ssize_t irq_len;
>        u64 irq_data[] __counted_by(irq_len);
> }

Changed to
-------------------------------------------------------------------------
/* An iommufd_vevent represents a vIOMMU event in an iommufd_veventq */
struct iommufd_vevent {
	struct list_head node;
	ssize_t data_len;
	u64 event_data[] __counted_by(data_len);
};
[...]
	vevent = kmalloc(struct_size(vevent, event_data, data_len), GFP_KERNEL);
-	header->irq_data = (void *)header + sizeof(*header);
-------------------------------------------------------------------------

Thanks
Nicolin