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SubjectRe: [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

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