On Tuesday 24 March 2009 15:41:43 Cam Macdonell wrote: > Avi Kivity wrote: > > Kumar, Venkat wrote: > >> Just like how Xen has Xenbus, Emulated Platform-PCI device and Events > >> for Inter VM communication, Does KVM has any mechanism for Inter VM > >> communication? How to share a page between two virtual machines > >> running on KVM? > > > > If you just want to share a page (or a bunch of memory), write a qemu > > PCI device model that exposes that page through a BAR. The guests can > > then map the BAR and access the page. > > > > To share the page, use normal Linux memory sharing, such as shared > > memory segments or mapped files (possibly on /dev/shm). > > I've actually created a patch (and corresponding device driver) that > works this way based on Avi's suggestion of this approach before. I'm > willing to release it of course, but it's in pretty rough form being my > first Qemu/KVM PCI device. Avi (or anyone else), would you mind having > a quick look first before I release it to the list? I agree with Avi on just going ahead and sending it. I'd like to take a look too. > > FYI, I'm using this for my PhD research. > > > Note that sharing will break as soon as one of the guests is migrated > > away. > > > > To send events you can utilize pci interrupts. > > I haven't implemented PCI interrupts yet, but would appreciate some > pointers on how to go about this. > > Thanks, > Cam > -- > 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 -- 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
