linux-kernel - Re: [PATCH v5 5/6] iommu/amd: Modify clear_dte

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Message-ID: <20241007141021.GQ1365916@nvidia.com>
Date: Mon, 7 Oct 2024 11:10:21 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc: linux-kernel@...r.kernel.org, iommu@...ts.linux.dev, joro@...tes.org,
	robin.murphy@....com, vasant.hegde@....com, kevin.tian@...el.com,
	jon.grimm@....com, santosh.shukla@....com, pandoh@...gle.com,
	kumaranand@...gle.com
Subject: Re: [PATCH v5 5/6] iommu/amd: Modify clear_dte_entry() to avoid
 in-place update

On Mon, Oct 07, 2024 at 04:13:52AM +0000, Suravee Suthikulpanit wrote:
> Lock DTE and copy value to a temporary storage before update using
> cmpxchg128.
> 
> Also, refactor the function to simplify logic for applying erratum 63.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>  drivers/iommu/amd/iommu.c | 18 ++++++------------
>  1 file changed, 6 insertions(+), 12 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason