Handle the case where the balloon target is larger than total ram size.
BUG: unable to handle kernel paging request at 0000000000100100
IP: [<ffffffff881970f9>] :virtio_balloon:leak__balloon+0x2e/0xbe
Signed-off-by: Marcelo Tosatti <[EMAIL PROTECTED]>
Index: virtio/virtio_balloon.c
===================================================================
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -122,10 +122,21 @@ static void release_pages_by_pfn(const u
}
}
+static void update_target_size(struct virtio_balloon *vb)
+{
+ __le32 num_pages = cpu_to_le32(vb->num_pages);
+
+ vb->vdev->config->set(vb->vdev,
+ offsetof(struct virtio_balloon_config, num_pages),
+ &num_pages, sizeof(num_pages));
+}
+
+
static void leak_balloon(struct virtio_balloon *vb, size_t num)
{
struct page *page;
+ num = min_t(unsigned int, vb->num_pages, num);
/* We can only do one array worth at a time. */
num = min(num, ARRAY_SIZE(vb->pfns));
@@ -136,6 +147,12 @@ static void leak_balloon(struct virtio_b
vb->num_pages--;
}
+ /* Have nothing to release? update target accordingly. */
+ if (vb->num_pfns == 0) {
+ update_target_size(vb);
+ return;
+ }
+
if (vb->tell_host_first) {
tell_host(vb, vb->deflate_vq);
release_pages_by_pfn(vb->pfns, vb->num_pfns);
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