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

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Message-ID: <20150915095235.1333ab5f.cornelia.huck@de.ibm.com>
Date:	Tue, 15 Sep 2015 09:52:35 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	gleb@...nel.org, pbonzini@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com,
	stable@...r.kernel.org
Subject: Re: [PATCH V6 4/6] kvm: fix zero length mmio searching

On Tue, 15 Sep 2015 14:41:57 +0800
Jason Wang <jasowang@...hat.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@...r.kernel.org
> Cc: Gleb Natapov <gleb@...nel.org>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>  virt/kvm/kvm_main.c | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)

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

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