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iommu/vt-d: Don't copy translation tables if RTT bit needs to be changed

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We can't change the RTT bit when translation is enabled, so
don't copy translation tables when we would change the bit
with our new root entry.

Tested-by: ZhenHua Li <zhen-hual@hp.com>
Tested-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-06-12 12:39:25 +02:00
parent a87f491890
commit c3361f2f6e
1 changed files with 11 additions and 1 deletions
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12
drivers/iommu/intel-iommu.c
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@ -2934,10 +2934,20 @@ static int copy_translation_tables(struct intel_iommu *iommu)
unsigned long flags;
u64 rtaddr_reg;
int bus, ret;
bool ext;
bool new_ext, ext;
rtaddr_reg = dmar_readq(iommu->reg + DMAR_RTADDR_REG);
ext = !!(rtaddr_reg & DMA_RTADDR_RTT);
new_ext = !!ecap_ecs(iommu->ecap);
/*
* The RTT bit can only be changed when translation is disabled,
* but disabling translation means to open a window for data
* corruption. So bail out and don't copy anything if we would
* have to change the bit.
*/
if (new_ext != ext)
return -EINVAL;
old_rt_phys = rtaddr_reg & VTD_PAGE_MASK;
if (!old_rt_phys)