linux-kernel - Re: [PATCH v15 11/11] RFC: fw

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Message-ID: <20180228191650-mutt-send-email-mst@kernel.org>
Date:   Wed, 28 Feb 2018 19:17:38 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Marc-André Lureau <marcandre.lureau@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sergio Lopez Pascual <slp@...hat.com>,
        Baoquan He <bhe@...hat.com>, "Somlo, Gabriel" <somlo@....edu>,
        xiaolong.ye@...el.com
Subject: Re: [PATCH v15 11/11] RFC: fw_cfg: do DMA read operation

On Wed, Feb 28, 2018 at 04:41:51PM +0100, Marc-André Lureau wrote:
> I don't know if it's always safe to enable dma in read_raw(), how
> could we know? Is there a check we could use to choose one or ther
> other (and thus avoiding explicit dma/readfn argument)?

IMHO the way to go is not to try to do zero copy.
Allocate a buffer and DMA there, then copy.

-- 
MST