linux-kernel - RE: [PATCH v7 2/6] vfio/nvgrace-gpu: Add support for huge pfnmap

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Message-ID:
 <CH3PR12MB7548581B57EBA82B803EE884ABDEA@CH3PR12MB7548.namprd12.prod.outlook.com>
Date: Wed, 26 Nov 2025 08:59:20 +0000
From: Shameer Kolothum <skolothumtho@...dia.com>
To: Ankit Agrawal <ankita@...dia.com>, "jgg@...pe.ca" <jgg@...pe.ca>, Yishai
 Hadas <yishaih@...dia.com>, "kevin.tian@...el.com" <kevin.tian@...el.com>,
	"alex@...zbot.org" <alex@...zbot.org>, Aniket Agashe <aniketa@...dia.com>,
	Vikram Sethi <vsethi@...dia.com>, Matt Ochs <mochs@...dia.com>
CC: "Yunxiang.Li@....com" <Yunxiang.Li@....com>, "yi.l.liu@...el.com"
	<yi.l.liu@...el.com>, "zhangdongdong@...incomputing.com"
	<zhangdongdong@...incomputing.com>, Avihai Horon <avihaih@...dia.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>, "peterx@...hat.com"
	<peterx@...hat.com>, "pstanner@...hat.com" <pstanner@...hat.com>, Alistair
 Popple <apopple@...dia.com>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Neo Jia
	<cjia@...dia.com>, Kirti Wankhede <kwankhede@...dia.com>, "Tarun Gupta
 (SW-GPU)" <targupta@...dia.com>, Zhi Wang <zhiw@...dia.com>, Dan Williams
	<danw@...dia.com>, Dheeraj Nigam <dnigam@...dia.com>, Krishnakant Jaju
	<kjaju@...dia.com>
Subject: RE: [PATCH v7 2/6] vfio/nvgrace-gpu: Add support for huge pfnmap



> -----Original Message-----
> From: Ankit Agrawal <ankita@...dia.com>
> Sent: 26 November 2025 05:26
> To: Ankit Agrawal <ankita@...dia.com>; jgg@...pe.ca; Yishai Hadas
> <yishaih@...dia.com>; Shameer Kolothum <skolothumtho@...dia.com>;
> kevin.tian@...el.com; alex@...zbot.org; Aniket Agashe
> <aniketa@...dia.com>; Vikram Sethi <vsethi@...dia.com>; Matt Ochs
> <mochs@...dia.com>
> Cc: Yunxiang.Li@....com; yi.l.liu@...el.com;
> zhangdongdong@...incomputing.com; Avihai Horon <avihaih@...dia.com>;
> bhelgaas@...gle.com; peterx@...hat.com; pstanner@...hat.com; Alistair
> Popple <apopple@...dia.com>; kvm@...r.kernel.org; linux-
> kernel@...r.kernel.org; Neo Jia <cjia@...dia.com>; Kirti Wankhede
> <kwankhede@...dia.com>; Tarun Gupta (SW-GPU) <targupta@...dia.com>;
> Zhi Wang <zhiw@...dia.com>; Dan Williams <danw@...dia.com>; Dheeraj
> Nigam <dnigam@...dia.com>; Krishnakant Jaju <kjaju@...dia.com>
> Subject: [PATCH v7 2/6] vfio/nvgrace-gpu: Add support for huge pfnmap
> 
> From: Ankit Agrawal <ankita@...dia.com>
> 
> NVIDIA's Grace based systems have large device memory. The device
> memory is mapped as VM_PFNMAP in the VMM VMA. The nvgrace-gpu
> module could make use of the huge PFNMAP support added in mm [1].
> 
> To make use of the huge pfnmap support, fault/huge_fault ops
> based mapping mechanism needs to be implemented. Currently nvgrace-gpu
> module relies on remap_pfn_range to do the mapping during VM bootup.
> Replace it to instead rely on fault and use vfio_pci_vmf_insert_pfn
> to setup the mapping.
> 
> Moreover to enable huge pfnmap, nvgrace-gpu module is updated by
> adding huge_fault ops implementation. The implementation establishes
> mapping according to the order request. Note that if the PFN or the
> VMA address is unaligned to the order, the mapping fallbacks to
> the PTE level.
> 
> Link: https://lore.kernel.org/all/20240826204353.2228736-1-
> peterx@...hat.com/ [1]
> 
> Cc: Shameer Kolothum <skolothumtho@...dia.com>
> Cc: Alex Williamson <alex@...zbot.org>
> Cc: Jason Gunthorpe <jgg@...pe.ca>
> Cc: Vikram Sethi <vsethi@...dia.com>
> Reviewed-by: Zhi Wang <zhiw@...dia.com>
> Signed-off-by: Ankit Agrawal <ankita@...dia.com>

Reviewed-by: Shameer Kolothum <skolothumtho@...dia.com>