linux-kernel - [PATCH] VMCI: Use set_page_dirty_lock() when unregistering guest memory

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Date:   Mon, 11 Jan 2021 04:18:55 -0800
From:   Jorgen Hansen <jhansen@...are.com>
To:     <linux-kernel@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>
CC:     <gregkh@...uxfoundation.org>, <pv-drivers@...are.com>,
        Jorgen Hansen <jhansen@...are.com>
Subject: [PATCH] VMCI: Use set_page_dirty_lock() when unregistering guest memory

When the VMCI host support releases guest memory in the case where
the VM was killed, the pinned guest pages aren't locked. Use
set_page_dirty_lock() instead of set_page_dirty().

Testing done: Killed VM while having an active VMCI based vSocket
connection and observed warning from ext4. With this fix, no
warning was observed. Ran various vSocket tests without issues.

Fixes: 06164d2b72aa ("VMCI: queue pairs implementation.")
Reviewed-by: Vishnu Dasa <vdasa@...are.com>
Signed-off-by: Jorgen Hansen <jhansen@...are.com>
---
 drivers/misc/vmw_vmci/vmci_queue_pair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c
index a3691c1..525ef96 100644
--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -630,7 +630,7 @@ static void qp_release_pages(struct page **pages,
 
 	for (i = 0; i < num_pages; i++) {
 		if (dirty)
-			set_page_dirty(pages[i]);
+			set_page_dirty_lock(pages[i]);
 
 		put_page(pages[i]);
 		pages[i] = NULL;
-- 
2.6.2