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authorMichael S. Tsirkin <mst@redhat.com>2010-11-29 10:19:07 +0200
committerMichael S. Tsirkin <mst@redhat.com>2010-12-09 15:39:17 +0200
commit3bf9be40ff76b6df136f14a497167c116b2b3c53 (patch)
tree27b8f715ea2de959bb0c06ff9b99e408a0942182 /drivers/vhost
parenta290aec88a9c4747353ea7aa9b2569bd61297c3c (diff)
downloadlinux-linaro-stable-3bf9be40ff76b6df136f14a497167c116b2b3c53.tar.gz
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 916cdbc279e0..4c256d15c249 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -885,6 +885,7 @@ 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;
@@ -898,7 +899,7 @@ 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;
}