From: Christoph Hellwig <hch@lst.de>
To: LABBE Corentin <clabbe@baylibre.com>
Cc: Christoph Hellwig <hch@lst.de>,
Ben Dooks <ben.dooks@codethink.co.uk>,
herbert@gondor.apana.org.au, heiko@sntech.de,
linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org, linux-sunxi@lists.linux.dev
Subject: Re: [RFC PATCH] crypto: flush poison data
Date: Tue, 5 Jul 2022 19:58:34 +0200 [thread overview]
Message-ID: <20220705175834.GA15815@lst.de> (raw)
In-Reply-To: <YsR7O4q4IRI14Wkc@Red>
On Tue, Jul 05, 2022 at 07:56:11PM +0200, LABBE Corentin wrote:
> My problem is that a dma_sync on the data buffer corrupt the poison buffer as collateral dommage.
> Probably because the sync operate on a larger region than the requested dma_sync length.
> So I try to flush poison data in the cryptoAPI.
Data structures that are DMAed to must be aligned to
the value returned by dma_get_cache_alignment(), as non-coherent DMA
by definition can disturb the data inside that boundary. That is not
a bug but fundamentally part of how DMA works when the device attachment
is not cache coherent.
next prev parent reply other threads:[~2022-07-05 17:58 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-01 13:27 [RFC PATCH] crypto: flush poison data Corentin Labbe
2022-07-01 13:35 ` Ben Dooks
2022-07-05 8:21 ` LABBE Corentin
2022-07-05 16:42 ` Christoph Hellwig
2022-07-05 17:56 ` LABBE Corentin
2022-07-05 17:58 ` Christoph Hellwig [this message]
2022-07-06 7:25 ` LABBE Corentin
2022-07-06 9:47 ` Ben Dooks
2022-07-06 11:58 ` Christoph Hellwig
2022-07-06 12:23 ` LABBE Corentin
2022-07-01 14:36 ` Andre Przywara
2022-07-01 14:55 ` LABBE Corentin
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