diff options
| -rw-r--r-- | drivers/iommu/dmar.c | 11 | ||||
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 15 |
2 files changed, 25 insertions, 1 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 97b2e21ac46a..cf065df9bb18 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -582,7 +582,7 @@ int alloc_iommu(struct dmar_drhd_unit *drhd) { struct intel_iommu *iommu; int map_size; - u32 ver; + u32 ver, sts; static int iommu_allocated = 0; int agaw = 0; int msagaw = 0; @@ -652,6 +652,15 @@ int alloc_iommu(struct dmar_drhd_unit *drhd) (unsigned long long)iommu->cap, (unsigned long long)iommu->ecap); + /* Reflect status in gcmd */ + sts = readl(iommu->reg + DMAR_GSTS_REG); + if (sts & DMA_GSTS_IRES) + iommu->gcmd |= DMA_GCMD_IRE; + if (sts & DMA_GSTS_TES) + iommu->gcmd |= DMA_GCMD_TE; + if (sts & DMA_GSTS_QIES) + iommu->gcmd |= DMA_GCMD_QIE; + raw_spin_lock_init(&iommu->register_lock); drhd->iommu = iommu; diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index bb1e57926746..276ef3832c0b 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -3630,6 +3630,7 @@ static struct notifier_block device_nb = { int __init intel_iommu_init(void) { int ret = 0; + struct dmar_drhd_unit *drhd; /* VT-d is required for a TXT/tboot launch, so enforce that */ force_on = tboot_force_iommu(); @@ -3640,6 +3641,20 @@ int __init intel_iommu_init(void) return -ENODEV; } + /* + * Disable translation if already enabled prior to OS handover. + */ + for_each_drhd_unit(drhd) { + struct intel_iommu *iommu; + + if (drhd->ignored) + continue; + + iommu = drhd->iommu; + if (iommu->gcmd & DMA_GCMD_TE) + iommu_disable_translation(iommu); + } + if (dmar_dev_scope_init() < 0) { if (force_on) panic("tboot: Failed to initialize DMAR device scope\n"); |