From: Jason Gunthorpe <jgg@nvidia.com>
To: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: linux-kernel@vger.kernel.org, iommu@lists.linux.dev,
joro@8bytes.org, robin.murphy@arm.com, vasant.hegde@amd.com,
kevin.tian@intel.com, jon.grimm@amd.com, santosh.shukla@amd.com,
pandoh@google.com, kumaranand@google.com
Subject: Re: [PATCH v4 6/6] iommu/amd: Lock DTE before updating the entry with WRITE_ONCE()
Date: Thu, 26 Sep 2024 16:58:13 -0300 [thread overview]
Message-ID: <20240926195813.GB229871@nvidia.com> (raw)
In-Reply-To: <20240916171805.324292-7-suravee.suthikulpanit@amd.com>
On Mon, Sep 16, 2024 at 05:18:05PM +0000, Suravee Suthikulpanit wrote:
> When updating only within a 64-bit tuple of a DTE, just lock the DTE and
> use WRITE_ONCE() because it is writing to memory read back by HW.
>
> Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
> ---
> drivers/iommu/amd/iommu.c | 42 ++++++++++++++++++++++-----------------
> 1 file changed, 24 insertions(+), 18 deletions(-)
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Jason
next prev parent reply other threads:[~2024-09-26 19:58 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-16 17:17 [PATCH v4 0/6] iommu/amd: Use 128-bit cmpxchg operation to update DTE Suravee Suthikulpanit
2024-09-16 17:18 ` [PATCH v4 1/6] iommu/amd: Disable AMD IOMMU if CMPXCHG16B feature is not supported Suravee Suthikulpanit
2024-09-16 17:18 ` [PATCH v4 2/6] iommu/amd: Introduce helper function to update 256-bit DTE Suravee Suthikulpanit
2024-09-26 19:46 ` Jason Gunthorpe
2024-10-03 16:15 ` Suthikulpanit, Suravee
2024-10-03 18:54 ` Jason Gunthorpe
2024-09-16 17:18 ` [PATCH v4 3/6] iommu/amd: Modify set_dte_entry() to use 256-bit DTE helpers Suravee Suthikulpanit
2024-09-26 19:56 ` Jason Gunthorpe
2024-10-03 16:16 ` Suthikulpanit, Suravee
2024-10-03 18:49 ` Jason Gunthorpe
2024-09-16 17:18 ` [PATCH v4 4/6] iommu/amd: Introduce helper function get_dte256() Suravee Suthikulpanit
2024-09-26 19:49 ` Jason Gunthorpe
2024-09-16 17:18 ` [PATCH v4 5/6] iommu/amd: Modify clear_dte_entry() to avoid in-place update Suravee Suthikulpanit
2024-09-26 19:54 ` Jason Gunthorpe
2024-10-03 16:15 ` Suthikulpanit, Suravee
2024-09-16 17:18 ` [PATCH v4 6/6] iommu/amd: Lock DTE before updating the entry with WRITE_ONCE() Suravee Suthikulpanit
2024-09-26 19:58 ` Jason Gunthorpe [this message]
2024-09-23 15:03 ` [PATCH v4 0/6] iommu/amd: Use 128-bit cmpxchg operation to update DTE Suthikulpanit, Suravee
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