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IOMMU Fixes for Linux v5.3-rc4

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Including:
 
 	- A couple more fixes for the Intel VT-d driver for bugs
 	  introduced during the recent conversion of this driver to use
 	  IOMMU core default domains.
 
 	- Fix for common dma-iommu code to make sure MSI mappings happen
 	  in the correct domain for a device.
 
 	- Fix a corner case in the handling of sg-lists in dma-iommu
 	  code that might cause dma_length to be truncated.
 
 	- Mark a switch as fall-through in arm-smmu code.
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Merge tag 'iommu-fixes-v5.3-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull iommu fixes from Joerg Roedel:

 - A couple more fixes for the Intel VT-d driver for bugs introduced
   during the recent conversion of this driver to use IOMMU core default
   domains.

 - Fix for common dma-iommu code to make sure MSI mappings happen in the
   correct domain for a device.

 - Fix a corner case in the handling of sg-lists in dma-iommu code that
   might cause dma_length to be truncated.

 - Mark a switch as fall-through in arm-smmu code.

* tag 'iommu-fixes-v5.3-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/vt-d: Fix possible use-after-free of private domain
  iommu/vt-d: Detach domain before using a private one
  iommu/dma: Handle SG length overflow better
  iommu/vt-d: Correctly check format of page table in debugfs
  iommu/vt-d: Detach domain when move device out of group
  iommu/arm-smmu: Mark expected switch fall-through
  iommu/dma: Handle MSI mappings separately
This commit is contained in:
Linus Torvalds 2019-08-14 10:16:59 -07:00
commit b5e33e44d9
4 changed files with 23 additions and 13 deletions
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4
drivers/iommu/arm-smmu-v3.c
View File

@ -1186,8 +1186,8 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_master *master, u32 sid,
ste_live = true;
break;
case STRTAB_STE_0_CFG_ABORT:
if (disable_bypass)
break;
BUG_ON(!disable_bypass);
break;
default:
BUG(); /* STE corruption */
}

19
drivers/iommu/dma-iommu.c
View File

@ -459,13 +459,11 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
{
struct iommu_domain *domain = iommu_get_dma_domain(dev);
struct iommu_dma_cookie *cookie = domain->iova_cookie;
size_t iova_off = 0;
struct iova_domain *iovad = &cookie->iovad;
size_t iova_off = iova_offset(iovad, phys);
dma_addr_t iova;
if (cookie->type == IOMMU_DMA_IOVA_COOKIE) {
iova_off = iova_offset(&cookie->iovad, phys);
size = iova_align(&cookie->iovad, size + iova_off);
}
size = iova_align(iovad, size + iova_off);
iova = iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev);
if (!iova)
@ -764,7 +762,7 @@ static int __finalise_sg(struct device *dev, struct scatterlist *sg, int nents,
* - and wouldn't make the resulting output segment too long
*/
if (cur_len && !s_iova_off && (dma_addr & seg_mask) &&
(cur_len + s_length <= max_len)) {
(max_len - cur_len >= s_length)) {
/* ...then concatenate it with the previous one */
cur_len += s_length;
} else {
@ -1147,16 +1145,21 @@ static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
if (!msi_page)
return NULL;
iova = __iommu_dma_map(dev, msi_addr, size, prot);
if (iova == DMA_MAPPING_ERROR)
iova = iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev);
if (!iova)
goto out_free_page;
if (iommu_map(domain, iova, msi_addr, size, prot))
goto out_free_iova;
INIT_LIST_HEAD(&msi_page->list);
msi_page->phys = msi_addr;
msi_page->iova = iova;
list_add(&msi_page->list, &cookie->msi_page_list);
return msi_page;
out_free_iova:
iommu_dma_free_iova(cookie, iova, size);
out_free_page:
kfree(msi_page);
return NULL;

2
drivers/iommu/intel-iommu-debugfs.c
View File

@ -235,7 +235,7 @@ static void ctx_tbl_walk(struct seq_file *m, struct intel_iommu *iommu, u16 bus)
tbl_wlk.ctx_entry = context;
m->private = &tbl_wlk;
if (pasid_supported(iommu) && is_pasid_enabled(context)) {
if (dmar_readq(iommu->reg + DMAR_RTADDR_REG) & DMA_RTADDR_SMT) {
pasid_dir_ptr = context->lo & VTD_PAGE_MASK;
pasid_dir_size = get_pasid_dir_size(context);
pasid_dir_walk(m, pasid_dir_ptr, pasid_dir_size);

11
drivers/iommu/intel-iommu.c
View File

@ -3449,6 +3449,7 @@ static bool iommu_need_mapping(struct device *dev)
dmar_domain = to_dmar_domain(domain);
dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
}
dmar_remove_one_dev_info(dev);
get_private_domain_for_dev(dev);
}
@ -4790,7 +4791,8 @@ static void __dmar_remove_one_dev_info(struct device_domain_info *info)
/* free the private domain */
if (domain->flags & DOMAIN_FLAG_LOSE_CHILDREN &&
!(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY))
!(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY) &&
list_empty(&domain->devices))
domain_exit(info->domain);
free_devinfo_mem(info);
@ -4803,7 +4805,8 @@ static void dmar_remove_one_dev_info(struct device *dev)
spin_lock_irqsave(&device_domain_lock, flags);
info = dev->archdata.iommu;
__dmar_remove_one_dev_info(info);
if (info)
__dmar_remove_one_dev_info(info);
spin_unlock_irqrestore(&device_domain_lock, flags);
}
@ -5281,6 +5284,7 @@ static int intel_iommu_add_device(struct device *dev)
if (device_def_domain_type(dev) == IOMMU_DOMAIN_IDENTITY) {
ret = iommu_request_dm_for_dev(dev);
if (ret) {
dmar_remove_one_dev_info(dev);
dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
domain_add_dev_info(si_domain, dev);
dev_info(dev,
@ -5291,6 +5295,7 @@ static int intel_iommu_add_device(struct device *dev)
if (device_def_domain_type(dev) == IOMMU_DOMAIN_DMA) {
ret = iommu_request_dma_domain_for_dev(dev);
if (ret) {
dmar_remove_one_dev_info(dev);
dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
if (!get_private_domain_for_dev(dev)) {
dev_warn(dev,
@ -5316,6 +5321,8 @@ static void intel_iommu_remove_device(struct device *dev)
if (!iommu)
return;
dmar_remove_one_dev_info(dev);
iommu_group_remove_device(dev);
iommu_device_unlink(&iommu->iommu, dev);