Re: [PATCH v3 29/30] luo: allow preserving memfd

On Tue, Aug 26, 2025 at 01:20:19PM -0300, Jason Gunthorpe wrote:

On Thu, Aug 07, 2025 at 01:44:35AM +0000, Pasha Tatashin wrote:

quoted

+	/*
+	 * Most of the space should be taken by preserved folios. So take its
+	 * size, plus a page for other properties.
+	 */
+	fdt = memfd_luo_create_fdt(PAGE_ALIGN(preserved_size) + PAGE_SIZE);
+	if (!fdt) {
+		err = -ENOMEM;
+		goto err_unpin;
+	}

This doesn't seem to have any versioning scheme, it really should..

quoted

+	err = fdt_property_placeholder(fdt, "folios", preserved_size,
+				       (void **)&preserved_folios);
+	if (err) {
+		pr_err("Failed to reserve folios property in FDT: %s\n",
+		       fdt_strerror(err));
+		err = -ENOMEM;
+		goto err_free_fdt;
+	}

Yuk.

This really wants some luo helper

'luo alloc array'
'luo restore array'
'luo free array'

We can just add kho_{preserve,restore}_vmalloc(). I've drafted it here:
https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/log/?h=kho/vmalloc/v1

Will wait for kbuild and then send proper patches.
 

-- 
Sincerely yours,
Mike.