linux-kernel - Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function

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Message-ID: <20210614153252.GA1741@lst.de>
Date:   Mon, 14 Jun 2021 17:32:52 +0200
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Christoph Hellwig <hch@....de>, Tianyu Lan <ltykernel@...il.com>,
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Subject: Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address
 setting function

On Mon, Jun 14, 2021 at 02:49:51PM +0100, Robin Murphy wrote:
> FWIW, I think a better generalisation for this would be allowing 
> set_memory_decrypted() to return an address rather than implicitly 
> operating in-place, and hide all the various hypervisor hooks behind that.

Yes, something like that would be a good idea.  As-is
set_memory_decrypted is a pretty horribly API anyway due to passing
the address as void, and taking a size parameter while it works in units
of pages.  So I'd very much welcome a major overhaul of this API.