On 10/15/2017 04:32 AM, geoff--- via Qemu-devel wrote: > Hi All, > > I am writing some code that needs to share a block of ram between a > Windows guest and Linux host. For this I am using the ivshmem device and > I have written a very primitive driver for windows that allows a single > application to request to memory map the pci bar (shared memory) into > the program's context using DeviceIoControl.
Note that upstream support of ivshmem is rather lackluster. Very often, the first question in response to someone saying "I need ivshmem", is "Why? and can we accomplish the same task using a better device instead?" Without knowing the full use case, it's hard to argue that ivshmem is the right device to fit the use case. There have been efforts to propose a better specified and better structured replacement for ivshmem, such as vhost-pci, but I'm not sure what status those patches are in, or if it would be a better fit for your needs. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
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