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authorLinus Torvalds <torvalds@linux-foundation.org>2023-04-28 19:43:49 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2023-04-28 19:43:49 +0300
commit22b8cc3e78f5448b4c5df00303817a9137cd663f (patch)
tree4c90f7ebbf4d439ae37f879f0e0f97c2eafd434b /drivers/iommu
parent7b664cc38ea7bdd5e3ce018bba98583741921bd4 (diff)
parent97740266de26e5dfe6e4fbecacb6995b66c2e378 (diff)
downloadlinux-22b8cc3e78f5448b4c5df00303817a9137cd663f.tar.xz
Merge tag 'x86_mm_for_6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 LAM (Linear Address Masking) support from Dave Hansen: "Add support for the new Linear Address Masking CPU feature. This is similar to ARM's Top Byte Ignore and allows userspace to store metadata in some bits of pointers without masking it out before use" * tag 'x86_mm_for_6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm/iommu/sva: Do not allow to set FORCE_TAGGED_SVA bit from outside x86/mm/iommu/sva: Fix error code for LAM enabling failure due to SVA selftests/x86/lam: Add test cases for LAM vs thread creation selftests/x86/lam: Add ARCH_FORCE_TAGGED_SVA test cases for linear-address masking selftests/x86/lam: Add inherit test cases for linear-address masking selftests/x86/lam: Add io_uring test cases for linear-address masking selftests/x86/lam: Add mmap and SYSCALL test cases for linear-address masking selftests/x86/lam: Add malloc and tag-bits test cases for linear-address masking x86/mm/iommu/sva: Make LAM and SVA mutually exclusive iommu/sva: Replace pasid_valid() helper with mm_valid_pasid() mm: Expose untagging mask in /proc/$PID/status x86/mm: Provide arch_prctl() interface for LAM x86/mm: Reduce untagged_addr() overhead for systems without LAM x86/uaccess: Provide untagged_addr() and remove tags before address check mm: Introduce untagged_addr_remote() x86/mm: Handle LAM on context switch x86: CPUID and CR3/CR4 flags for Linear Address Masking x86: Allow atomic MM_CONTEXT flags setting x86/mm: Rework address range check in get_user() and put_user()
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/iommu-sva.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c
index 24bf9b2b58aa..dd76a1a09cf7 100644
--- a/drivers/iommu/iommu-sva.c
+++ b/drivers/iommu/iommu-sva.c
@@ -2,6 +2,7 @@
/*
* Helpers for IOMMU drivers implementing SVA
*/
+#include <linux/mmu_context.h>
#include <linux/mutex.h>
#include <linux/sched/mm.h>
#include <linux/iommu.h>
@@ -32,16 +33,19 @@ int iommu_sva_alloc_pasid(struct mm_struct *mm, ioasid_t min, ioasid_t max)
min == 0 || max < min)
return -EINVAL;
+ if (!arch_pgtable_dma_compat(mm))
+ return -EBUSY;
+
mutex_lock(&iommu_sva_lock);
/* Is a PASID already associated with this mm? */
- if (pasid_valid(mm->pasid)) {
+ if (mm_valid_pasid(mm)) {
if (mm->pasid < min || mm->pasid >= max)
ret = -EOVERFLOW;
goto out;
}
pasid = ioasid_alloc(&iommu_sva_pasid, min, max, mm);
- if (!pasid_valid(pasid))
+ if (pasid == INVALID_IOASID)
ret = -ENOMEM;
else
mm_pasid_set(mm, pasid);