Revision 0b250250b7e7298e0001faf76015da4b03b6b1b3 authored by Prasad Singamsetty on 14 November 2017, 23:13:50 UTC, committed by Michael Roth on 21 June 2018, 01:45:05 UTC
The current implementation of Intel IOMMU code only supports 39 bits iova address width. This patch provides a new parameter (x-aw-bits) for intel-iommu to extend its address width to 48 bits but keeping the default the same (39 bits). The reason for not changing the default is to avoid potential compatibility problems with live migration of intel-iommu enabled QEMU guest. The only valid values for 'x-aw-bits' parameter are 39 and 48. After enabling larger address width (48), we should be able to map larger iova addresses in the guest. For example, a QEMU guest that is configured with large memory ( >=1TB ). To check whether 48 bits aw is enabled, we can grep in the guest dmesg output with line: "DMAR: Host address width 48". Signed-off-by: Prasad Singamsetty <prasad.singamsety@oracle.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> (cherry picked from commit 37f51384ae05bd50f83308339dbffa3e78404874) Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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ivgen-plain.h
/*
* QEMU Crypto block IV generator - plain
*
* Copyright (c) 2015-2016 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "crypto/ivgenpriv.h"
#ifndef QCRYPTO_IVGEN_PLAIN_H__
#define QCRYPTO_IVGEN_PLAIN_H__
extern struct QCryptoIVGenDriver qcrypto_ivgen_plain;
#endif /* QCRYPTO_IVGEN_PLAIN_H__ */
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