Arn wrote:
How can one share memory (a few variables not necessarily a page)
between host/hypervisor and guest VM ?
Since the guest is just a process within the host, there should be
existing ways to do this.
It's not that straight forward since the host has its pfn (page frame
number) while the guest has gfn (guest frame number) and also use
virtual memory.
What about using something like debugfs or sysfs, is it possible to
share variables this way ? Note, I want a system that
is fast, i.e. changes to shared variable/memory should be visible instantly.
A paravirtualized driver can take care of that with driver in the guest
and device side in qemu/host kernel.
You can use 9p virtio solution in Linux that implements a shared file
system.
I search the kvm-devel archives and found emails referring to "kshmem"
but a search on the kvm-70 code turns up nothing.
There are also some emails on sharing a page but no final outcome or
what exactly to do.
Thanks
Arn
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