On Wed, 2014-09-03 at 09:47 +0200, Paolo Bonzini wrote: > > IOMMU support for x86 is going to go in this week. But won't that break virtio on x86 ? Or will virtio continue bypassing it ? IE, the guest side virtio doesn't expect an IOMMU and doesn't call the dma mappings ops. > However, it is and likely will remain niche enough that I don't really > care about performance loss from IOMMU support. If you enable it, you > want it. > > So from the QEMU point of view we can simply add the direct-ram-access > property, and have the pseries machine turn it on by default (while > other machines can leave it off by default---they have no IOMMU and > thus no performance cost). Well, it's only for virtio and should be on by default on x86 as well if an iommu is installed no ? Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
