Re: [RFC 0/4] Virtio uses DMA API for all devices
From: Christoph Hellwig <hch@infradead.org>
Date: 2018-08-04 08:15:13
Also in:
lkml, virtualization
On Fri, Aug 03, 2018 at 10:17:32PM +0300, Michael S. Tsirkin wrote:
It seems reasonable to teach a platform to override dma-range for a specific device e.g. in case it knows about bugs in ACPI.
A platform will be able override dma-range using the dev->bus_dma_mask
field starting in 4.19. But we'll still need a way how to
a) document in the virtio spec that all bus dma quirks are to be
applied
b) a way to document in a virtio-related spec how the bus handles
dma for Ben's totally fucked up hypervisor. Without that there
is not way we'll get interoperable implementations.