On Mon, Oct 16, 2017 at 04:54:08PM +1100, Alexey Kardashevskiy wrote: > On 12/10/17 02:35, Benjamin Herrenschmidt wrote: > > On Wed, 2017-10-11 at 13:56 +1100, Alexey Kardashevskiy wrote: > >> Oopsie. This is because I overlooked it. Others do not use it. So I do need > >> a file. But in the current scheme where all BARs share one fd - it won't > >> work - I simply cannot allow WC on non-prefetchable BARs :-/ > > > > This is an oversight in the design of VFIO-PCI, it should have a way to > > specify write combine, either implicitely via such an arch hook, or > > explicitely via an ioctl prior to mapping the BARs for example. > > > > Alex, what do you reckon is the best approach here ? > > /me wonders if it is yet another issue for the dead issues bucket, just > like the msix mapping one :) Maybe. Alexey, maybe you can make up a list of things that we (me, you, BenH) need to discuss with Alex W at KVM Forum? -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
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