It will be used to distinguish the vma type in userfaultfd code. This likely needs to be done in the guestmem library.
Signed-off-by: Nikita Kalyazin kalyazin@amazon.com --- virt/kvm/guest_memfd.c | 5 +++++ virt/kvm/kvm_mm.h | 1 + 2 files changed, 6 insertions(+)
diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c index f93fe5835173..af825f7494ea 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -500,6 +500,11 @@ static ssize_t kvm_kmem_gmem_write(struct file *file, const char __user *buf, return ret && start == (*offset >> PAGE_SHIFT) ? ret : *offset - (start << PAGE_SHIFT); } + +bool kvm_gmem_vma_is_gmem(struct vm_area_struct *vma) +{ + return vma->vm_ops == &kvm_gmem_vm_ops; +} #endif /* CONFIG_KVM_GMEM_SHARED_MEM */
static struct file_operations kvm_gmem_fops = { diff --git a/virt/kvm/kvm_mm.h b/virt/kvm/kvm_mm.h index acef3f5c582a..09fcdf18a072 100644 --- a/virt/kvm/kvm_mm.h +++ b/virt/kvm/kvm_mm.h @@ -73,6 +73,7 @@ int kvm_gmem_create(struct kvm *kvm, struct kvm_create_guest_memfd *args); int kvm_gmem_bind(struct kvm *kvm, struct kvm_memory_slot *slot, unsigned int fd, loff_t offset); void kvm_gmem_unbind(struct kvm_memory_slot *slot); +bool kvm_gmem_vma_is_gmem(struct vm_area_struct *vma); #else static inline void kvm_gmem_init(struct module *module) {