linux-kernel - RE: [PATCH v4 09/23] iommufd: Abstract iopt_pin_pages and iopt_unpin

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Message-ID: <BN9PR11MB52762B0EE49C84ACB60F3E848C90A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Thu, 15 May 2025 05:54:25 +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 v4 09/23] iommufd: Abstract iopt_pin_pages and
 iopt_unpin_pages helpers

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Friday, May 9, 2025 11:03 AM
> 
> The new HW QUEUE object will be added for HW to access the guest queue
> for
> HW-accelerated virtualization feature. It needs to ensure the guest memory
> pages are pinned when HW accesses them and they are contiguous in
> physical
> address space.

'pin' is the generic requirement but contiguity is vendor specific. Let's
make it clear.

> 
> This is very like the existing iommufd_access_pin_pages() that outputs the
> pinned page list for the caller to test its contiguity.
> 
> Move those code from iommufd_access_pin/unpin_pages() and related
> function
> for a pair of iopt helpers that can be shared with the HW QUEUE allocator.
> 
> Rename check_area_prot() to align with the existing iopt_area helpers, and
> inline it to the header since iommufd_access_rw() still uses it.
> 
> Reviewed-by: Pranjal Shrivastava <praan@...gle.com>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>