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Re: [RFC PATCH V3 08/11] swiotlb: Add bounce buffer remap address setting function
- To: Robin Murphy <robin.murphy@xxxxxxx>
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Mon, 14 Jun 2021 17:32:52 +0200
- Cc: Christoph Hellwig <hch@xxxxxx>, Tianyu Lan <ltykernel@xxxxxxxxx>, kys@xxxxxxxxxxxxx, haiyangz@xxxxxxxxxxxxx, sthemmin@xxxxxxxxxxxxx, wei.liu@xxxxxxxxxx, decui@xxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, x86@xxxxxxxxxx, hpa@xxxxxxxxx, arnd@xxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, luto@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, rppt@xxxxxxxxxx, hannes@xxxxxxxxxxx, cai@xxxxxx, krish.sadhukhan@xxxxxxxxxx, saravanand@xxxxxx, Tianyu.Lan@xxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, m.szyprowski@xxxxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, jgross@xxxxxxxx, sstabellini@xxxxxxxxxx, joro@xxxxxxxxxx, will@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, davem@xxxxxxxxxxxxx, kuba@xxxxxxxxxx, jejb@xxxxxxxxxxxxx, martin.petersen@xxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, vkuznets@xxxxxxxxxx, thomas.lendacky@xxxxxxx, brijesh.singh@xxxxxxx, sunilmut@xxxxxxxxxxxxx
- Delivery-date: Mon, 14 Jun 2021 15:33:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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.
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