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

From	Cornelia Huck <cornelia.huck@de.ibm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH V6 4/6] kvm: fix zero length mmio searching
Date	2015-09-15 10:00 +0200
Message-ID	<q8TjJ-6Xi-31@gated-at.bofh.it> (permalink)
References	<q8SdX-5qT-3@gated-at.bofh.it> <q8SdX-5qT-1@gated-at.bofh.it>
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On Tue, 15 Sep 2015 14:41:57 +0800
Jason Wang <jasowang@redhat.com> 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@vger.kernel.org
> Cc: Gleb Natapov <gleb@kernel.org>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  virt/kvm/kvm_main.c | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>

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[PATCH V6 4/6] kvm: fix zero length mmio searching Jason Wang <jasowang@redhat.com> - 2015-09-15 08:50 +0200
  Re: [PATCH V6 4/6] kvm: fix zero length mmio searching Cornelia Huck <cornelia.huck@de.ibm.com> - 2015-09-15 10:00 +0200

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