linux-kernel - Re: [PATCH v8 14/29] iommufd/viommu: Add IOMMUFD_CMD_HW_QUEUE

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Message-ID: <20250709170904.GG1599700@nvidia.com>
Date: Wed, 9 Jul 2025 14:09:04 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, corbet@....net, will@...nel.org,
	bagasdotme@...il.com, robin.murphy@....com, joro@...tes.org,
	thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
	shuah@...nel.org, jsnitsel@...hat.com, nathan@...nel.org,
	peterz@...radead.org, yi.l.liu@...el.com, mshavit@...gle.com,
	praan@...gle.com, zhangzekun11@...wei.com, iommu@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-kselftest@...r.kernel.org, patches@...ts.linux.dev,
	mochs@...dia.com, alok.a.tiwari@...cle.com, vasant.hegde@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com
Subject: Re: [PATCH v8 14/29] iommufd/viommu: Add IOMMUFD_CMD_HW_QUEUE_ALLOC
 ioctl

On Fri, Jul 04, 2025 at 06:13:30PM -0700, Nicolin Chen wrote:
> +static struct iommufd_access *
> +iommufd_hw_queue_alloc_phys(struct iommu_hw_queue_alloc *cmd,
> +			    struct iommufd_viommu *viommu, phys_addr_t *base_pa)
> +{
> +	struct iommufd_access *access;
> +	struct page **pages;
> +	size_t max_npages;
> +	size_t length;
> +	u64 offset;
> +	size_t i;
> +	int rc;
> +
> +	offset =
> +		cmd->nesting_parent_iova - PAGE_ALIGN(cmd->nesting_parent_iova);

PAGE_ALIGN is ALIGN UP, that is the wrong direction?

It is just:

      offset = cmd->nesting_parent_iova % PAGE_SIZE;

And this is missing:

	*base_pa = (page_to_pfn(pages[0]) << PAGE_SHIFT) + offset;

??

Jason