On 10.11.14 14:55, Peter Maydell wrote: > On 10 November 2014 13:16, Alexander Graf <ag...@suse.de> wrote: >> Sorry, I don't understand this paragraph. Memory slots in general are >> accelerations for memory access - for MMIO (RAM is usually aligned), KVM >> can always exit to QEMU and just do a manual MMIO exit. > > ...you're a bit stuck if you were hoping to execute code from > that RAM, though, so they're not *purely* acceleration, right?
Yes and no. Technically, there's no reason KVM couldn't do an MMIO exit dance to fetch the next instruction. From user space this should be indistinguishable. Today, I don't think it's implemented though :). Alex
