linux-kernel - [PATCH v3 2/3] xen/privcmd: Mark pages as dirty

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Date:   Sun, 12 Jul 2020 09:09:54 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     boris.ostrovsky@...cle.com, jgross@...e.com, sstabellini@...nel.org
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        Souptick Joarder <jrdr.linux@...il.com>,
        John Hubbard <jhubbard@...dia.com>,
        Paul Durrant <xadimgnik@...il.com>
Subject: [PATCH v3 2/3] xen/privcmd: Mark pages as dirty

pages need to be marked as dirty before unpinned it in
unlock_pages() which was oversight. This is fixed now.

Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
Suggested-by: John Hubbard <jhubbard@...dia.com>
Reviewed-by: Juergen Gross <jgross@...e.com>
Cc: John Hubbard <jhubbard@...dia.com>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Paul Durrant <xadimgnik@...il.com>
---
 drivers/xen/privcmd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index b001673..079d35b 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -611,8 +611,11 @@ static void unlock_pages(struct page *pages[], unsigned int nr_pages)
 {
 	unsigned int i;
 
-	for (i = 0; i < nr_pages; i++)
+	for (i = 0; i < nr_pages; i++) {
+		if (!PageDirty(pages[i]))
+			set_page_dirty_lock(pages[i]);
 		put_page(pages[i]);
+	}
 }
 
 static long privcmd_ioctl_dm_op(struct file *file, void __user *udata)
-- 
1.9.1