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iommu/vt-d: Don't switch off swiotlb if bounce page is used

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The bounce page implementation depends on swiotlb. Hence, don't
switch off swiotlb if the system has untrusted devices or could
potentially be hot-added with any untrusted devices.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2019-09-06 14:14:50 +08:00 committed by Joerg Roedel
parent e5e04d0519
commit c5a5dc4cbb
2 changed files with 18 additions and 15 deletions
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1
drivers/iommu/Kconfig
View File

@ -182,6 +182,7 @@ config INTEL_IOMMU
select IOMMU_IOVA
select NEED_DMA_MAP_STATE
select DMAR_TABLE
select SWIOTLB
help
DMA remapping (DMAR) devices support enables independent address
translations for Direct Memory Access (DMA) from devices.

32
drivers/iommu/intel-iommu.c
View File

@ -4547,22 +4547,20 @@ const struct attribute_group *intel_iommu_groups[] = {
NULL,
};
static int __init platform_optin_force_iommu(void)
static inline bool has_untrusted_dev(void)
{
struct pci_dev *pdev = NULL;
bool has_untrusted_dev = false;
if (!dmar_platform_optin() || no_platform_optin)
return 0;
for_each_pci_dev(pdev)
if (pdev->untrusted)
return true;
for_each_pci_dev(pdev) {
if (pdev->untrusted) {
has_untrusted_dev = true;
break;
}
}
return false;
}
if (!has_untrusted_dev)
static int __init platform_optin_force_iommu(void)
{
if (!dmar_platform_optin() || no_platform_optin || !has_untrusted_dev())
return 0;
if (no_iommu || dmar_disabled)
@ -4576,9 +4574,6 @@ static int __init platform_optin_force_iommu(void)
iommu_identity_mapping |= IDENTMAP_ALL;
dmar_disabled = 0;
#if defined(CONFIG_X86) && defined(CONFIG_SWIOTLB)
swiotlb = 0;
#endif
no_iommu = 0;
return 1;
@ -4718,7 +4713,14 @@ int __init intel_iommu_init(void)
up_write(&dmar_global_lock);
#if defined(CONFIG_X86) && defined(CONFIG_SWIOTLB)
swiotlb = 0;
/*
* If the system has no untrusted device or the user has decided
* to disable the bounce page mechanisms, we don't need swiotlb.
* Mark this and the pre-allocated bounce pages will be released
* later.
*/
if (!has_untrusted_dev() || intel_no_bounce)
swiotlb = 0;
#endif
dma_ops = &intel_dma_ops;