netdev - [PATCH net] vhost: flush dcache page when logging dirty pages

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Message-Id: <20190409041647.21269-1-jasowang@redhat.com>
Date:   Tue,  9 Apr 2019 12:16:47 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Christoph Hellwig <hch@...radead.org>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        Andrea Arcangeli <aarcange@...hat.com>
Subject: [PATCH net] vhost: flush dcache page when logging dirty pages

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 <hch@...radead.org>
Cc: James Bottomley <James.Bottomley@...senPartnership.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server")
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 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