We set dirty bit through setting up kmaps and access them through kernel virtual address, this may result alias in virtually tagged caches that require a dcache flush afterwards.
Cc: Christoph Hellwig <[email protected]> Cc: James Bottomley <[email protected]> Cc: Andrea Arcangeli <[email protected]> Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server") Signed-off-by: Jason Wang <[email protected]> --- drivers/vhost/vhost.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 351af88231ad..34a1cedbc5ba 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1711,6 +1711,7 @@ static int set_bit_to_user(int nr, void __user *addr) base = kmap_atomic(page); set_bit(bit, base); kunmap_atomic(base); + flush_dcache_page(page); set_page_dirty_lock(page); put_page(page); return 0; -- 2.19.1 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
