[PATCH RFC v2 41/50] KVM: guest_memfd: Add TODO for memory failure handling in PFN mode

[Ackerley Tng via B4 Relay]

From: Ackerley Tng <ackerleytng@xxxxxxxxxx>

Add a TODO comment noting that PFN mode does not use page-cache folios, so
->error_remove_folio() will not be called by the core memory failure
infrastructure when physical memory errors occur.

Signed-off-by: Ackerley Tng <ackerleytng@xxxxxxxxxx>
---
 virt/kvm/guest_memfd.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c
index 5741ff6ab94c6..c89df77df7146 100644
--- a/virt/kvm/guest_memfd.c
+++ b/virt/kvm/guest_memfd.c
@@ -1068,6 +1068,11 @@ static int kvm_gmem_migrate_folio(struct address_space *mapping,
 	return -EINVAL;
 }
 
+/*
+ * TODO: Support memory failure notification for PFN mode. In PFN mode, memory
+ * is not backed by page cache folios, so ->error_remove_folio() will not be
+ * invoked by the core memory failure handler.
+ */
 static int kvm_gmem_error_folio(struct address_space *mapping, struct folio *folio)
 {
 	struct inode *inode = mapping->host;

-- 
2.56.0.257.gf7497c7d27-goog