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Date:   Thu, 6 Jun 2019 08:36:52 +0000
From:   Horia Geanta <>
To:     Herbert Xu <>
CC:     Ard Biesheuvel <>,
        Iuliana Prodan <>,
        Eric Biggers <>,
        "David S. Miller" <>,
        Sascha Hauer <>,
        Linux Kernel Mailing List <>,
        dl-linux-imx <>
Subject: Re: [PATCH] crypto: gcm - fix cacheline sharing

On 6/6/2019 10:16 AM, Herbert Xu wrote:
> On Thu, Jun 06, 2019 at 07:10:06AM +0000, Horia Geanta wrote:
>> Not really.
>> I am in favor of using the HW to update the IV, which would work for all
>> skcipher algorithms.
>> I have the fix ready, will send it in a couple of days.
> OK that would be interesting to see.  But I presume you are still
> going to do a copy after the DMA unmap since you can't do DMA to
> req->iv?
Yes, an internally kmalloc-ed buffer is used for storing the IV (both input and
output IV).
Once HW finishes the job, area is DMA unmapped and then output IV is copied into


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