netdev - Re: [PATCH net-next ] vdpa: fix caching attributes of MMIO regions by setting them explicitly

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Message-ID: <63de3a12-36bc-45bf-a3e5-89246f4ec73f@redhat.com>
Date: Fri, 19 Dec 2025 10:06:16 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: mst@...hat.com
Cc: virtualization@...ts.linux.dev, eperezma@...hat.com, kvm@...r.kernel.org,
 jerinj@...vell.com, ndabilpuram@...vell.com, schalla@...vell.com,
 Kommula Shiva Shankar <kshankar@...vell.com>, netdev@...r.kernel.org,
 jasowang@...hat.com
Subject: Re: [PATCH net-next ] vdpa: fix caching attributes of MMIO regions by
 setting them explicitly

On 12/16/25 6:59 PM, Kommula Shiva Shankar wrote:
> Explicitly set non-cached caching attributes for MMIO regions.
> Default write-back mode can cause CPU to cache device memory,
> causing invalid reads and unpredictable behavior.
> 
> Invalid read and write issues were observed on ARM64 when mapping the
> notification area to userspace via mmap.
> 
> Signed-off-by: Kommula Shiva Shankar <kshankar@...vell.com>

@Micheal: despite the net-next prefix, I assume this patch will go via
your tree, as it looks unrelated from networking.

Cheers,

Paolo