On 06/05/2010 12:44 PM, Blue Swirl wrote:
On Fri, Jun 4, 2010 at 9:45 PM, Cam Macdonell<cam@xxxxxxxxxxxxxx> 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. -device ivshmem,size=<size in format accepted by -m>[,shm=<shm name>] Interrupts are supported between multiple VMs by using a shared memory server by using a chardev socket. -device ivshmem,size=<size in format accepted by -m>[,shm=<shm name>] [,chardev=<id>][,msi=on][,irqfd=on][,vectors=n][,role=peer|master] -chardev socket,path=<path>,id=<id> (shared memory server is qemu.git/contrib/ivshmem-server) Sample programs and init scripts are in a git repo here:Why is this KVM specific BTW, Posix SHM is available on many platforms? What would happen if kvm_set_foobar functions were not called when KVM is not being used? Is host eventfd support essential?
It's not kvm specific, it's atomic-ops-on-shared-memory-are-visible-as-atomic-ops specific, which is currently only available with kvm. When tcg gains true smp support (and not just against other tcg threads) this can work with tcg as well.
I guess that needs a host with at least 32/64 bit CAS for 32/64 bit targets respectively, and double that if the target has DCAS. Not sure how targets with ll/sc can be implemented, especially if there are limits as to what can go in between.
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