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| author | Jan Beulich <jbeulich@suse.com> | 2013-09-06 15:42:00 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2013-09-06 15:42:00 +0200 |
| commit | 47477f63bb2ee742a83633ff8d303188f3828672 (patch) | |
| tree | 0a7cb782f33a2973fab80030d94fa1465f1bfad5 | |
| parent | f02ec246e8323d63951880d221eea8d05af13c20 (diff) | |
| download | xen-47477f63bb2ee742a83633ff8d303188f3828672.tar.gz xen-47477f63bb2ee742a83633ff8d303188f3828672.tar.bz2 xen-47477f63bb2ee742a83633ff8d303188f3828672.zip | |
VT-d: warn about Compatibility Format Interrupts being enabled by firmware
... as being insecure.
Also drop the second (redundant) read DMAR_GSTS_REG from enable_intremap().
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by Xiantao Zhang <xiantao.zhang@intel.com>
master commit: c9c6abab583d27fdca1d979a7f1d18ae30f54e9b
master date: 2013-08-21 16:44:58 +0200
| -rw-r--r-- | xen/drivers/passthrough/vtd/intremap.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/xen/drivers/passthrough/vtd/intremap.c b/xen/drivers/passthrough/vtd/intremap.c index 6dc058445e..0fcc775e3e 100644 --- a/xen/drivers/passthrough/vtd/intremap.c +++ b/xen/drivers/passthrough/vtd/intremap.c @@ -752,15 +752,19 @@ int enable_intremap(struct iommu *iommu, int eim) if ( (sts & DMA_GSTS_IRES) && ir_ctrl->iremap_maddr ) return 0; - sts = dmar_readl(iommu->reg, DMAR_GSTS_REG); if ( !(sts & DMA_GSTS_QIES) ) { - dprintk(XENLOG_ERR VTDPREFIX, - "Queued invalidation is not enabled, should not enable " - "interrupt remapping\n"); + printk(XENLOG_ERR VTDPREFIX + " Queued invalidation is not enabled on IOMMU #%u:" + " Should not enable interrupt remapping\n", iommu->index); return -EINVAL; } + if ( !eim && (sts & DMA_GSTS_CFIS) ) + printk(XENLOG_WARNING VTDPREFIX + " Compatibility Format Interrupts permitted on IOMMU #%u:" + " Device pass-through will be insecure\n", iommu->index); + if ( ir_ctrl->iremap_maddr == 0 ) { drhd = iommu_to_drhd(iommu); |