From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Thu, 28 Mar 2013 00:23:41 +0000 (-0700)
Subject: tcm_vhost: Avoid VIRTIO_RING_F_EVENT_IDX feature bit
X-Git-Tag: v3.9-rc5~5^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5dade71050e799d8679698a6145e2ba46cdeac2a;p=pandora-kernel.git

tcm_vhost: Avoid VIRTIO_RING_F_EVENT_IDX feature bit

This patch adds a VHOST_SCSI_FEATURES mask minus VIRTIO_RING_F_EVENT_IDX
so that vhost-scsi-pci userspace will strip this feature bit once
GET_FEATURES reports it as being unsupported on the host.

This is to avoid a bug where ->handle_kicks() are missed when EVENT_IDX
is enabled by default in userspace code.

(mst: Rename to VHOST_SCSI_FEATURES + add comment)

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Asias He <asias@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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