Re: [RFC V2] virtio: Add platform specific DMA API translation for virito devices

[Michael S. Tsirkin]

On Thu, May 31, 2018 at 09:09:24AM +0530, Anshuman Khandual wrote:
> On 05/24/2018 12:51 PM, Ram Pai wrote:
> > On Wed, May 23, 2018 at 09:50:02PM +0300, Michael S. Tsirkin wrote:
> >> subj: s/virito/virtio/
> >>
> > ..snip..
> >>>  machine_subsys_initcall_sync(pseries, tce_iommu_bus_notifier_init);
> >>> +
> >>> +bool platform_forces_virtio_dma(struct virtio_device *vdev)
> >>> +{
> >>> +	/*
> >>> +	 * On protected guest platforms, force virtio core to use DMA
> >>> +	 * MAP API for all virtio devices. But there can also be some
> >>> +	 * exceptions for individual devices like virtio balloon.
> >>> +	 */
> >>> +	return (of_find_compatible_node(NULL, NULL, "ibm,ultravisor") != NULL);
> >>> +}
> >>
> >> Isn't this kind of slow?  vring_use_dma_api is on
> >> data path and supposed to be very fast.
> > 
> > Yes it is slow and not ideal. This won't be the final code. The final
> > code will cache the information in some global variable and used
> > in this function.
> 
> Right this will be a simple check based on a global variable.
> 

Pls work on a long term solution. Short term needs can be served by
enabling the iommu platform in qemu.

-- 
MST