linux-kernel - RE: [PATCH v5 06/13] iommufd: Allow pt_id to carry viommu_id for IOMMU_HWPT

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Message-ID: <BN9PR11MB5276C669AE11D94CD2A1BD1E8C4A2@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Mon, 28 Oct 2024 02:46:29 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, "jgg@...dia.com" <jgg@...dia.com>,
	"will@...nel.org" <will@...nel.org>
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	"patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: RE: [PATCH v5 06/13] iommufd: Allow pt_id to carry viommu_id for
 IOMMU_HWPT_ALLOC

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Saturday, October 26, 2024 7:50 AM
> 
> Now a vIOMMU holds a shareable nesting parent HWPT. So, it can act like
> that nesting parent HWPT to allocate a nested HWPT.
> 
> Support that in the IOMMU_HWPT_ALLOC ioctl handler, and update its kdoc.
> 
> Also, add an iommufd_hwpt_nested_alloc_for_viommu helper to allocate a

the helper name is not updated.

> nested HWPT for a vIOMMU object. Since a vIOMMU object holds the parent
> hwpt's refcount already, increase the refcount of the vIOMMU only.
> 
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>

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