path: root/arch
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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-24 13:10:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-24 13:10:38 -0700
commit18b8bfdfbae5821a7df691bc1e542bbab6c31e9c (patch)
tree4c7c1d942c71b19fc6430e4acbe5b2f5967ab93d /arch
parentd972604f6f87478212f012af5560c4fd4bb2b01d (diff)
parent6488a7f35eeab463f6c9c2ea34d30ca856f0bc8e (diff)
Merge tag 'iommu-updates-v4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull IOMMU updates from Joerg Roedel: - PASID table handling updates for the Intel VT-d driver. It implements a global PASID space now so that applications usings multiple devices will just have one PASID. - A new config option to make iommu passthroug mode the default. - New sysfs attribute for iommu groups to export the type of the default domain. - A debugfs interface (for debug only) usable by IOMMU drivers to export internals to user-space. - R-Car Gen3 SoCs support for the ipmmu-vmsa driver - The ARM-SMMU now aborts transactions from unknown devices and devices not attached to any domain. - Various cleanups and smaller fixes all over the place. * tag 'iommu-updates-v4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (42 commits) iommu/omap: Fix cache flushes on L2 table entries iommu: Remove the ->map_sg indirection iommu/arm-smmu-v3: Abort all transactions if SMMU is enabled in kdump kernel iommu/arm-smmu-v3: Prevent any devices access to memory without registration iommu/ipmmu-vmsa: Don't register as BUS IOMMU if machine doesn't have IPMMU-VMSA iommu/ipmmu-vmsa: Clarify supported platforms iommu/ipmmu-vmsa: Fix allocation in atomic context iommu: Add config option to set passthrough as default iommu: Add sysfs attribyte for domain type iommu/arm-smmu-v3: sync the OVACKFLG to PRIQ consumer register iommu/arm-smmu: Error out only if not enough context interrupts iommu/io-pgtable-arm-v7s: Abort allocation when table address overflows the PTE iommu/io-pgtable-arm: Fix pgtable allocation in selftest iommu/vt-d: Remove the obsolete per iommu pasid tables iommu/vt-d: Apply per pci device pasid table in SVA iommu/vt-d: Allocate and free pasid table iommu/vt-d: Per PCI device pasid table interfaces iommu/vt-d: Add for_each_device_domain() helper iommu/vt-d: Move device_domain_info to header iommu/vt-d: Apply global PASID in SVA ...
Diffstat (limited to 'arch')
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index 023b4a9fc846..5f26962eff42 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -33,6 +33,11 @@ enum irq_remap_cap {
+enum {
struct vcpu_data {
u64 pi_desc_addr; /* Physical address of PI Descriptor */
u32 vector; /* Guest vector of the interrupt */
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index acfd04121da3..7ba73fe0d917 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -40,8 +40,14 @@ int iommu_detected __read_mostly = 0;
* devices and allow every device to access to whole physical memory. This is
* useful if a user wants to use an IOMMU only for KVM device assignment to
* guests and not for driver dma translation.
+ * It is also possible to disable by default in kernel config, and enable with
+ * iommu=nopt at boot time.
+int iommu_pass_through __read_mostly = 1;
int iommu_pass_through __read_mostly;
extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
@@ -135,6 +141,8 @@ static __init int iommu_setup(char *p)
if (!strncmp(p, "pt", 2))
iommu_pass_through = 1;
+ if (!strncmp(p, "nopt", 4))
+ iommu_pass_through = 0;