linux-kernel - RE: [PATCH v6 10/25] iommufd/viommu: Add IOMMUFD_CMD_HW_QUEUE

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Message-ID: <BN9PR11MB52763496C4A0066A77FED5B48C7BA@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Wed, 25 Jun 2025 03:45:08 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, "jgg@...dia.com" <jgg@...dia.com>,
	"corbet@....net" <corbet@....net>, "will@...nel.org" <will@...nel.org>
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Subject: RE: [PATCH v6 10/25] iommufd/viommu: Add IOMMUFD_CMD_HW_QUEUE_ALLOC
 ioctl

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Saturday, June 14, 2025 3:15 PM
> +
> +	offset =
> +		cmd->nesting_parent_iova - PAGE_ALIGN(cmd-
> >nesting_parent_iova);
> +	max_npages = DIV_ROUND_UP(offset + cmd->length, PAGE_SIZE);
> +
> +	/*
> +	 * FIXME allocation may fail when sizeof(*pages) * max_npages is
> +	 * larger than PAGE_SIZE. This might need a new API returning a
> +	 * bio_vec or something more efficient.
> +	 */
> +	pages = kcalloc(max_npages, sizeof(*pages), GFP_KERNEL);
> +	if (!pages)
> +		return ERR_PTR(-ENOMEM);
> +

any allocation may fail... can you elaborate more here? How does
PAGE_SIZE become a boundary?