[RFC v2 PATCH 10/13] KVM: Match inode for invalidation of fd-based slot

[Chao Peng]

Different fd/priv_fd can have the same userspace_addr so start/end
is meaningful only when they are used together with fd/priv_fd.

Signed-off-by: Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx>
Signed-off-by: Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>
---
 virt/kvm/kvm_main.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 090afbadb03f..65055ac460eb 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -479,6 +479,7 @@ typedef void (*on_lock_fn_t)(struct kvm *kvm, unsigned long start,
 struct kvm_useraddr_range {
 	unsigned long start;
 	unsigned long end;
+	struct inode *inode;
 	pte_t pte;
 	gfn_handler_t handler;
 	on_lock_fn_t on_lock;
@@ -520,6 +521,17 @@ static __always_inline int __kvm_handle_useraddr_range(struct kvm *kvm,
 		kvm_for_each_memslot(slot, slots) {
 			unsigned long useraddr_start, useraddr_end;
 
+			/*
+			 * Skip the slot if range->inode is not the same as
+			 * that in slot->file or slot->priv_file.
+			 */
+			if (range->inode &&
+			    (!slot->file ||
+			     slot->file->f_inode != range->inode) &&
+			    (!slot->priv_file ||
+			     slot->priv_file->f_inode != range->inode))
+				continue;
+
 			useraddr_start = max(range->start, slot->userspace_addr);
 			useraddr_end = min(range->end, slot->userspace_addr +
 						  (slot->npages << PAGE_SHIFT));
@@ -818,6 +830,7 @@ int kvm_memfd_invalidate_range(struct kvm *kvm, struct inode *inode,
 	const struct kvm_useraddr_range useraddr_range = {
 		.start		= start,
 		.end		= end,
+		.inode		= inode,
 		.pte		= __pte(0),
 		.handler	= kvm_unmap_gfn_range,
 		.on_lock	= (void *)kvm_null_fn,
-- 
2.17.1