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Date:   Wed, 15 May 2019 21:40:35 +0800
From:   Herbert Xu <herbert@gondor.apana.org.au>
To:     Pascal Van Leeuwen <pvanleeuwen@insidesecure.com>
Cc:     Christophe Leroy <christophe.leroy@c-s.fr>,
        Eric Biggers <ebiggers@google.com>,
        "linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>
Subject: Re: Can scatterlist elements cross page boundary ?
Message-ID: <20190515134035.uu3gpmruq5fijnh5@gondor.apana.org.au>
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On Wed, May 15, 2019 at 12:08:45PM +0000, Pascal Van Leeuwen wrote:
> Hi Christophe,
> 
> I ran into a similar issue with the Inside Secure driver.
> 
> If I understood correctly, scatter buffers do not need to be enclosed in a single page as long as the scatter buffer as a whole is contiguous in memory. So it can be multiple pages, but then they have to be back-to-back in physical/device memory.
> 
> The latter should be guaranteed by the kernel allocator.

Yes this is correct.

Thanks,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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