Hi On Thu, Feb 16, 2017 at 12:02 AM Sébastien Frémal < sebastien.fre...@gmail.com> wrote:
> Hello ! > > I searched for a forum or a place where questions about QEMU can be asked, > but I found nothing except mailing lists. If there is a more appropriate > place for my question, do not hesitate to indicate it to me !! > > So, I'm trying to use ivshmem to share memory pages between several VM. I > found many webpages documenting the set up of this device. I successfully > installed the mechanism in the host. I launched ivshmem-clients which > successfully connected to the server. The problem is that I can't > understand how to access to the shared memory pages in a VM. I launched my > VM with this command line : > sudo qemu-system-x86_64 -show-cursor -enable-kvm -drive > format=raw,file=/var/lib/libvirt/images/theRise.img -m 4096 -machine q35 > -show-cursor -device ivshmem-doorbell,vectors=4,chardev=ivshmem -chardev > socket,path=/tmp/ivshmem_socket,id=ivshmem > (the server was launched with : sudo ivshmem-server -p > /var/run/ivshmem-server.pid -S /tmp/ivshmem_socket -M ivshmem -l 4K -n 4). > > The VM executes properly (I just don't have a visible mouse cursor despite > the "-show-cursor" option, but it could be worse) but I have absolutely no > idea on how to access the ivshmem device. I firstly thought that the option > would add a new device in /dev but there is nothing special. I ran an > There is no guest driver for ivshmem, it's left deliberately open for any usage. > updatedb/locate ivshmem to check if there was something interesting on the > machine, but there is no results. I don't know which socket path I must > give to my ivshmem client in my VM so it can connect to my server. I > You give the socket path of the server, in your example /tmp/ivshmem_socket is fine. > searched for this particular information on the web, but I found nothing. > > Did you read http://nairobi-embedded.org/linux_pci_device_driver.html ? Can someone indicate me how to connect to the ivshmem-server from a VM > please ? > > Your example should work. Note that ivshmem is not well regarded by the qemu community, what are you trying to accomplish? cheers -- Marc-André Lureau
