diff options
| -rw-r--r-- | drivers/iommu/dmar.c | 25 | ||||
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 53 | ||||
| -rw-r--r-- | include/linux/dmar.h | 8 |
3 files changed, 84 insertions, 2 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index d9c748b6f9e4..1edf2a251336 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -2042,3 +2042,28 @@ int dmar_device_remove(acpi_handle handle) { return dmar_device_hotplug(handle, false); } + +/* + * dmar_platform_optin - Is %DMA_CTRL_PLATFORM_OPT_IN_FLAG set in DMAR table + * + * Returns true if the platform has %DMA_CTRL_PLATFORM_OPT_IN_FLAG set in + * the ACPI DMAR table. This means that the platform boot firmware has made + * sure no device can issue DMA outside of RMRR regions. + */ +bool dmar_platform_optin(void) +{ + struct acpi_table_dmar *dmar; + acpi_status status; + bool ret; + + status = acpi_get_table(ACPI_SIG_DMAR, 0, + (struct acpi_table_header **)&dmar); + if (ACPI_FAILURE(status)) + return false; + + ret = !!(dmar->flags & DMAR_PLATFORM_OPT_IN); + acpi_put_table((struct acpi_table_header *)dmar); + + return ret; +} +EXPORT_SYMBOL_GPL(dmar_platform_optin); diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 41a4b8808802..30e8584137f5 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -184,6 +184,7 @@ static int rwbf_quirk; */ static int force_on = 0; int intel_iommu_tboot_noforce; +static int no_platform_optin; #define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry)) @@ -503,6 +504,7 @@ static int __init intel_iommu_setup(char *str) pr_info("IOMMU enabled\n"); } else if (!strncmp(str, "off", 3)) { dmar_disabled = 1; + no_platform_optin = 1; pr_info("IOMMU disabled\n"); } else if (!strncmp(str, "igfx_off", 8)) { dmar_map_gfx = 0; @@ -2895,6 +2897,13 @@ static int iommu_should_identity_map(struct device *dev, int startup) if (device_is_rmrr_locked(dev)) return 0; + /* + * Prevent any device marked as untrusted from getting + * placed into the statically identity mapping domain. + */ + if (pdev->untrusted) + return 0; + if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev)) return 1; @@ -4728,14 +4737,54 @@ const struct attribute_group *intel_iommu_groups[] = { NULL, }; +static int __init platform_optin_force_iommu(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) { + has_untrusted_dev = true; + break; + } + } + + if (!has_untrusted_dev) + return 0; + + if (no_iommu || dmar_disabled) + pr_info("Intel-IOMMU force enabled due to platform opt in\n"); + + /* + * If Intel-IOMMU is disabled by default, we will apply identity + * map for all devices except those marked as being untrusted. + */ + if (dmar_disabled) + iommu_identity_mapping |= IDENTMAP_ALL; + + dmar_disabled = 0; +#if defined(CONFIG_X86) && defined(CONFIG_SWIOTLB) + swiotlb = 0; +#endif + no_iommu = 0; + + return 1; +} + int __init intel_iommu_init(void) { int ret = -ENODEV; struct dmar_drhd_unit *drhd; struct intel_iommu *iommu; - /* VT-d is required for a TXT/tboot launch, so enforce that */ - force_on = tboot_force_iommu(); + /* + * Intel IOMMU is required for a TXT/tboot launch or platform + * opt in, so enforce that. + */ + force_on = tboot_force_iommu() || platform_optin_force_iommu(); if (iommu_init_mempool()) { if (force_on) diff --git a/include/linux/dmar.h b/include/linux/dmar.h index 843a41ba7e28..f8af1d770520 100644 --- a/include/linux/dmar.h +++ b/include/linux/dmar.h @@ -39,6 +39,7 @@ struct acpi_dmar_header; /* DMAR Flags */ #define DMAR_INTR_REMAP 0x1 #define DMAR_X2APIC_OPT_OUT 0x2 +#define DMAR_PLATFORM_OPT_IN 0x4 struct intel_iommu; @@ -170,6 +171,8 @@ static inline int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert) { return 0; } #endif /* CONFIG_IRQ_REMAP */ +extern bool dmar_platform_optin(void); + #else /* CONFIG_DMAR_TABLE */ static inline int dmar_device_add(void *handle) @@ -182,6 +185,11 @@ static inline int dmar_device_remove(void *handle) return 0; } +static inline bool dmar_platform_optin(void) +{ + return false; +} + #endif /* CONFIG_DMAR_TABLE */ struct irte { |