[PATCH 02/13] KVM: Actually truncate the inode when doing PUNCH_HOLE for guest_memfd

Sean Christopherson
2023-09-21T22:50:27Z

Restore the call to truncate_inode_pages_range() in guest_memfd's handling
of PUNCH_HOLE that was unintentionally removed in a rebase gone bad.

Reported-by: Michael Roth <michael.roth@amd.com>
Fixes: 1d46f95498c5 ("KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory")
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
virt/kvm/guest_mem.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/virt/kvm/guest_mem.c b/virt/kvm/guest_mem.c
index a819367434e9..3c9e83a596fe 100644
--- a/virt/kvm/guest_mem.c
+++ b/virt/kvm/guest_mem.c
@@ -140,10 +140,13 @@ static long kvm_gmem_punch_hole(struct inode *inode, loff_t offset, loff_t len)
*/
filemap_invalidate_lock(inode->i_mapping);

- list_for_each_entry(gmem, gmem_list, entry) {
+ list_for_each_entry(gmem, gmem_list, entry)
kvm_gmem_invalidate_begin(gmem, start, end);
+
+ truncate_inode_pages_range(inode->i_mapping, offset, offset + len - 1);
+
+ list_for_each_entry(gmem, gmem_list, entry)
kvm_gmem_invalidate_end(gmem, start, end);
- }

filemap_invalidate_unlock(inode->i_mapping);

--
2.42.0.515.g380fc7ccd1-goog