linux-kernel - Re: [PATCH] iommu/amd: Add kernel parameters to limit V1 page-sizes

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Message-ID: <20240905175206.GX1358970@nvidia.com>
Date: Thu, 5 Sep 2024 14:52:06 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Joerg Roedel <joro@...tes.org>
Cc: Baolu Lu <baolu.lu@...ux.intel.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	Vasant Hegde <vasant.hegde@....com>, linux-doc@...r.kernel.org,
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH] iommu/amd: Add kernel parameters to limit V1 page-sizes

On Thu, Sep 05, 2024 at 05:13:53PM +0200, Joerg Roedel wrote:
> On Thu, Sep 05, 2024 at 09:05:31AM -0300, Jason Gunthorpe wrote:
> > On Thu, Sep 05, 2024 at 09:34:07AM +0200, Joerg Roedel wrote:
> > > On Thu, Sep 05, 2024 at 03:31:08PM +0800, Baolu Lu wrote:
> > > > "iommu.nohugepages=1"?
> > > 
> > > Generally yes, but that requires to touch all drivers to make the
> > > behavior consistent. We can start this effort on-top of this change, if
> > > desired.
> > 
> > Let's at least use the same keyword that already exists though??
> 
> You mean amd_iommu=sp_off? I am not in favour of that, in the Linux
> world the term 'hugepage' is more common than 'superpage'. So I
> would avoid spreading the use of the later. We can extend that later to
> the iommu.nohugepages parameter suggested by Baolu.

I see, okay, let me check with some people if the mlx5 part is Ok

Thanks,
Jason