Re: [PATCH V6 4/6] kvm: fix zero length mmio searching

[Cornelia Huck]

On Tue, 15 Sep 2015 14:41:57 +0800
Jason Wang <jasowang@xxxxxxxxxx> wrote:

> Currently, if we had a zero length mmio eventfd assigned on
> KVM_MMIO_BUS. It will never be found by kvm_io_bus_cmp() since it
> always compares the kvm_io_range() with the length that guest
> wrote. This will cause e.g for vhost, kick will be trapped by qemu
> userspace instead of vhost. Fixing this by using zero length if an
> iodevice is zero length.
> 
> Cc: stable@xxxxxxxxxxxxxxx
> Cc: Gleb Natapov <gleb@xxxxxxxxxx>
> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
>  virt/kvm/kvm_main.c | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)

Reviewed-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>

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