Shared context usage is reflected in a vm area (vma). To handle this,
a new flag (VM_SHARED_CTX) is added anlng with a pointer to a shared
context structure (vm_shared_mmu_ctx).
This commit does not contain the method by which a vma is marked for
shared context.
Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
---
include/linux/mm.h | 1 +
include/linux/mm_types.h | 13 +++++++++++++
2 files changed, 14 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index a92c8d7..9d82028 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -182,6 +182,7 @@ extern unsigned int kobjsize(const void *objp);
#define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
#define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
+#define VM_SHARED_CTX 0x00800000 /* Shared TLB context */
#define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
#define VM_ARCH_2 0x02000000
#define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 4a8aced..0c30d43 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -291,6 +291,18 @@ struct vm_userfaultfd_ctx {
struct vm_userfaultfd_ctx {};
#endif /* CONFIG_USERFAULTFD */
+#ifdef CONFIG_SHARED_MMU_CTX
+#define NULL_VM_SHARED_MMU_CTX ((struct vm_shared_mmu_ctx) { NULL, })
+struct vm_shared_mmu_ctx {
+ struct shared_mmu_ctx *ctx;
+};
+#define vma_shared_ctx_val(vma) \
+ ((vma)->vm_shared_mmu_ctx.ctx ? \
+ (vma)->vm_shared_mmu_ctx.ctx->shared_ctx_val : 0UL)
+#else /* CONFIG_SHARED__MMU_CTX */
+struct vm_shared_mmu_ctx {};
+#endif /* CONFIG_SHARED_MMU_CTX */
+
/*
* This struct defines a memory VMM memory area. There is one of these
* per VM-area/task. A VM area is any part of the process virtual memory
@@ -358,6 +370,7 @@ struct vm_area_struct {
struct mempolicy *vm_policy; /* NUMA policy for the VMA */
#endif
struct vm_userfaultfd_ctx vm_userfaultfd_ctx;
+ struct vm_shared_mmu_ctx vm_shared_mmu_ctx;
};
struct core_thread {
--
2.7.4
--
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