Paul Brook wrote: > > On 03/08/2010 12:53 AM, Paul Brook wrote: > > >> Support an inter-vm shared memory device that maps a shared-memory > > >> object as a PCI device in the guest. This patch also supports > > >> interrupts between guest by communicating over a unix domain socket. > > >> This patch applies to the qemu-kvm repository. > > > > > > No. All new devices should be fully qdev based. > > > > > > I suspect you've also ignored a load of coherency issues, especially when > > > not using KVM. As soon as you have shared memory in more than one host > > > thread/process you have to worry about memory barriers. > > > > Shouldn't it be sufficient to require the guest to issue barriers (and > > to ensure tcg honours the barriers, if someone wants this with tcg)?. > > In a cross environment that becomes extremely hairy. For example the x86 > architecture effectively has an implicit write barrier before every store, and > an implicit read barrier before every load. Btw, x86 doesn't have any implicit barriers due to ordinary loads. Only stores and atomics have implicit barriers, afaik. -- Jamie -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
