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authorMichael S. Tsirkin <mst@redhat.com>2010-11-29 10:19:07 +0200
committerMichael S. Tsirkin <mst@redhat.com>2010-11-29 10:26:55 +0200
commite4dde731ae70072338352c6f8fb75fd04a42cf8d (patch)
treee278b13b3abd0f31b10a8f8d6f0343e74836b563 /drivers/vhost
parent11cd1a8b8cad1acfc140d9acce93762a9c140b20 (diff)
vhost: correctly set bits of dirty pages
Fix two bugs in dirty page logging: When counting pages we should increase address by 1 instead of VHOST_PAGE_SIZE. Make log_write() correctly process requests that cross pages with write_address not starting at page boundary. Reported-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vhost.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 94701ff3a23..159c77a5746 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -884,6 +884,7 @@ static int log_write(void __user *log_base,
int r;
if (!write_length)
return 0;
+ write_length += write_address % VHOST_PAGE_SIZE;
write_address /= VHOST_PAGE_SIZE;
for (;;) {
u64 base = (u64)(unsigned long)log_base;
@@ -897,7 +898,7 @@ static int log_write(void __user *log_base,
if (write_length <= VHOST_PAGE_SIZE)
break;
write_length -= VHOST_PAGE_SIZE;
- write_address += VHOST_PAGE_SIZE;
+ write_address += 1;
}
return r;
}