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Moreover, mbind() couldn't be used since memory wasn't mapped to userspace in VMM. Enable NUMA policy support by implementing vm_ops for guest-memfd mmap operation. This allows VMM to map the memory and use mbind() to set the desired NUMA policy. The policy is then retrieved via mpol_shared_policy_lookup() and passed to filemap_grab_folio_mpol() to ensure that allocations follow the specified memory policy. This enables VMM to control guest memory NUMA placement by calling mbind() on the mapped memory regions, providing fine-grained control over guest memory allocation across NUMA nodes. Suggested-by: David Hildenbrand Signed-off-by: Shivank Garg --- virt/kvm/guest_memfd.c | 76 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 75 insertions(+), 1 deletion(-) diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c index f18176976ae3..8d1dfce5d3dc 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -2,6 +2,7 @@ #include #include #include +#include #include #include @@ -11,8 +12,12 @@ struct kvm_gmem { struct kvm *kvm; struct xarray bindings; struct list_head entry; + struct shared_policy policy; }; +static struct mempolicy *kvm_gmem_get_pgoff_policy(struct kvm_gmem *gmem, + pgoff_t index); + /** * folio_file_pfn - like folio_file_page, but return a pfn. * @folio: The folio which contains this index. @@ -99,7 +104,25 @@ static int kvm_gmem_prepare_folio(struct kvm *kvm, struct kvm_memory_slot *slot, static struct folio *kvm_gmem_get_folio(struct file *file, pgoff_t index) { /* TODO: Support huge pages. */ - return filemap_grab_folio(file_inode(file)->i_mapping, index); + struct kvm_gmem *gmem = file->private_data; + struct inode *inode = file_inode(file); + struct mempolicy *policy; + struct folio *folio; + + /* + * Fast-path: See if folio is already present in mapping to avoid + * policy_lookup. + */ + folio = __filemap_get_folio(inode->i_mapping, index, + FGP_LOCK | FGP_ACCESSED, 0); + if (!IS_ERR(folio)) + return folio; + + policy = kvm_gmem_get_pgoff_policy(gmem, index); + folio = filemap_grab_folio_mpol(inode->i_mapping, index, policy); + mpol_cond_put(policy); + + return folio; } static void kvm_gmem_invalidate_begin(struct kvm_gmem *gmem, pgoff_t start, @@ -291,6 +314,7 @@ static int kvm_gmem_release(struct inode *inode, struct file *file) mutex_unlock(&kvm->slots_lock); xa_destroy(&gmem->bindings); + mpol_free_shared_policy(&gmem->policy); kfree(gmem); kvm_put_kvm(kvm); @@ -312,8 +336,57 @@ static pgoff_t kvm_gmem_get_index(struct kvm_memory_slot *slot, gfn_t gfn) { return gfn - slot->base_gfn + slot->gmem.pgoff; } +#ifdef CONFIG_NUMA +static int kvm_gmem_set_policy(struct vm_area_struct *vma, struct mempolicy *new) +{ + struct file *file = vma->vm_file; + struct kvm_gmem *gmem = file->private_data; + + return mpol_set_shared_policy(&gmem->policy, vma, new); +} + +static struct mempolicy *kvm_gmem_get_policy(struct vm_area_struct *vma, + unsigned long addr, pgoff_t *pgoff) +{ + struct file *file = vma->vm_file; + struct kvm_gmem *gmem = file->private_data; + + *pgoff = vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT); + return mpol_shared_policy_lookup(&gmem->policy, *pgoff); +} + +static struct mempolicy *kvm_gmem_get_pgoff_policy(struct kvm_gmem *gmem, + pgoff_t index) +{ + struct mempolicy *mpol; + + mpol = mpol_shared_policy_lookup(&gmem->policy, index); + return mpol ? mpol : get_task_policy(current); +} +#else +static struct mempolicy *kvm_gmem_get_pgoff_policy(struct kvm_gmem *gmem, + pgoff_t index) +{ + return NULL; +} +#endif /* CONFIG_NUMA */ + +static const struct vm_operations_struct kvm_gmem_vm_ops = { +#ifdef CONFIG_NUMA + .get_policy = kvm_gmem_get_policy, + .set_policy = kvm_gmem_set_policy, +#endif +}; + +static int kvm_gmem_mmap(struct file *file, struct vm_area_struct *vma) +{ + file_accessed(file); + vma->vm_ops = &kvm_gmem_vm_ops; + return 0; +} static struct file_operations kvm_gmem_fops = { + .mmap = kvm_gmem_mmap, .open = generic_file_open, .release = kvm_gmem_release, .fallocate = kvm_gmem_fallocate, @@ -446,6 +519,7 @@ static int __kvm_gmem_create(struct kvm *kvm, loff_t size, u64 flags) kvm_get_kvm(kvm); gmem->kvm = kvm; xa_init(&gmem->bindings); + mpol_shared_policy_init(&gmem->policy, NULL); list_add(&gmem->entry, &inode->i_mapping->i_private_list); fd_install(fd, file);