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

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Message-ID: <ZtnKsf71piBohHt_@8bytes.org>
Date: Thu, 5 Sep 2024 17:13:53 +0200
From: Joerg Roedel <joro@...tes.org>
To: Jason Gunthorpe <jgg@...dia.com>
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 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.

Regards,

	Joerg