[PATCH v7 15/42] KVM: guest_memfd: Use actual size for invalidation in kvm_gmem_release()
From: Ackerley Tng via B4 Relay <devnull+ackerleytng.google.com@kernel.org>
Date: 2026-05-23 00:18:04
Also in:
b4-sent, kvm, linux-coco, linux-doc, linux-kselftest, linux-mm, lkml
Subsystem:
kernel virtual machine (kvm), the rest · Maintainers:
Paolo Bonzini, Linus Torvalds
From: Ackerley Tng <redacted> __kvm_gmem_invalidate_begin() and __kvm_gmem_invalidate_end() actually do not specially handle -1ul. -1ul is used as a huge number, which legal indices do not exceed, and hence the invalidation works as expected. Since a later patch is going to make use of the exact range, calculate the size of the guest_memfd inode and use it as the end range for invalidating SPTEs. Signed-off-by: Ackerley Tng <redacted> --- virt/kvm/guest_memfd.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c
index 352cb8b837468..38b24f79ec223 100644
--- a/virt/kvm/guest_memfd.c
+++ b/virt/kvm/guest_memfd.c@@ -370,6 +370,7 @@ static int kvm_gmem_release(struct inode *inode, struct file *file) struct kvm_memory_slot *slot; struct kvm *kvm = f->kvm; unsigned long index; + pgoff_t end; /* * Prevent concurrent attempts to *unbind* a memslot. This is the last
@@ -396,9 +397,10 @@ static int kvm_gmem_release(struct inode *inode, struct file *file) * Zap all SPTEs pointed at by this file. Do not free the backing * memory, as its lifetime is associated with the inode, not the file. */ - __kvm_gmem_invalidate_begin(f, 0, -1ul, + end = i_size_read(inode) >> PAGE_SHIFT; + __kvm_gmem_invalidate_begin(f, 0, end, kvm_gmem_get_invalidate_filter(inode)); - __kvm_gmem_invalidate_end(f, 0, -1ul); + __kvm_gmem_invalidate_end(f, 0, end); list_del(&f->entry);
--
2.54.0.794.g4f17f83d09-goog