virtio_balloon: fix handling of PAGE_SIZE != 4k

As reported by David Gibson, current code handles PAGE_SIZE != 4k
completely wrong which can lead to guest memory corruption errors:

- page_to_balloon_pfn is wrong: e.g. on system with 64K page size
 it gives the same pfn value for 16 different pages.

- we also need to convert back to linux pfns when we free.

- for each linux page we need to tell host about multiple balloon
  pages, but code only adds one pfn to the array.

This patch fixes all that, tested with a 64k ppc64 kernel.

Reported-by: David Gibson <david@gibson.dropbear.id.au>
Tested-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 9e95ca6..c2d05a8 100644 (file)
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -28,6 +28,13 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 
+/*
+ * Balloon device works in 4K page units.  So each page is pointed to by
+ * multiple balloon pages.  All memory counters in this driver are in balloon
+ * page units.
+ */
+#define VIRTIO_BALLOON_PAGES_PER_PAGE (PAGE_SIZE >> VIRTIO_BALLOON_PFN_SHIFT)
+
 struct virtio_balloon
 {
        struct virtio_device *vdev;
@@ -42,8 +49,13 @@ struct virtio_balloon
        /* Waiting for host to ack the pages we released. */
        struct completion acked;
 
-       /* The pages we've told the Host we're not using. */
+       /* Number of balloon pages we've told the Host we're not using. */
        unsigned int num_pages;
+       /*
+        * The pages we've told the Host we're not using.
+        * Each page on this list adds VIRTIO_BALLOON_PAGES_PER_PAGE
+        * to num_pages above.
+        */
        struct list_head pages;
 
        /* The array of pfns we tell the Host about. */
@@ -66,7 +78,13 @@ static u32 page_to_balloon_pfn(struct page *page)
 
        BUILD_BUG_ON(PAGE_SHIFT < VIRTIO_BALLOON_PFN_SHIFT);
        /* Convert pfn from Linux page size to balloon page size. */
-       return pfn >> (PAGE_SHIFT - VIRTIO_BALLOON_PFN_SHIFT);
+       return pfn * VIRTIO_BALLOON_PAGES_PER_PAGE;
+}
+
+static struct page *balloon_pfn_to_page(u32 pfn)
+{
+       BUG_ON(pfn % VIRTIO_BALLOON_PAGES_PER_PAGE);
+       return pfn_to_page(pfn / VIRTIO_BALLOON_PAGES_PER_PAGE);
 }
 
 static void balloon_ack(struct virtqueue *vq)
@@ -96,12 +114,23 @@ static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq)
        wait_for_completion(&vb->acked);
 }
 
+static void set_page_pfns(u32 pfns[], struct page *page)
+{
+       unsigned int i;
+
+       /* Set balloon pfns pointing at this page.
+        * Note that the first pfn points at start of the page. */
+       for (i = 0; i < VIRTIO_BALLOON_PAGES_PER_PAGE; i++)
+               pfns[i] = page_to_balloon_pfn(page) + i;
+}
+
 static void fill_balloon(struct virtio_balloon *vb, size_t num)
 {
        /* We can only do one array worth at a time. */
        num = min(num, ARRAY_SIZE(vb->pfns));
 
-       for (vb->num_pfns = 0; vb->num_pfns < num; vb->num_pfns++) {
+       for (vb->num_pfns = 0; vb->num_pfns < num;
+            vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE) {
                struct page *page = alloc_page(GFP_HIGHUSER | __GFP_NORETRY |
                                        __GFP_NOMEMALLOC | __GFP_NOWARN);
                if (!page) {
@@ -113,9 +142,9 @@ static void fill_balloon(struct virtio_balloon *vb, size_t num)
                        msleep(200);
                        break;
                }
-               vb->pfns[vb->num_pfns] = page_to_balloon_pfn(page);
+               set_page_pfns(vb->pfns + vb->num_pfns, page);
+               vb->num_pages += VIRTIO_BALLOON_PAGES_PER_PAGE;
                totalram_pages--;
-               vb->num_pages++;
                list_add(&page->lru, &vb->pages);
        }
 
@@ -130,8 +159,9 @@ static void release_pages_by_pfn(const u32 pfns[], unsigned int num)
 {
        unsigned int i;
 
-       for (i = 0; i < num; i++) {
-               __free_page(pfn_to_page(pfns[i]));
+       /* Find pfns pointing at start of each page, get pages and free them. */
+       for (i = 0; i < num; i += VIRTIO_BALLOON_PAGES_PER_PAGE) {
+               __free_page(balloon_pfn_to_page(pfns[i]));
                totalram_pages++;
        }
 }
@@ -143,11 +173,12 @@ static void leak_balloon(struct virtio_balloon *vb, size_t num)
        /* We can only do one array worth at a time. */
        num = min(num, ARRAY_SIZE(vb->pfns));
 
-       for (vb->num_pfns = 0; vb->num_pfns < num; vb->num_pfns++) {
+       for (vb->num_pfns = 0; vb->num_pfns < num;
+            vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE) {
                page = list_first_entry(&vb->pages, struct page, lru);
                list_del(&page->lru);
-               vb->pfns[vb->num_pfns] = page_to_balloon_pfn(page);
-               vb->num_pages--;
+               set_page_pfns(vb->pfns + vb->num_pfns, page);
+               vb->num_pages -= VIRTIO_BALLOON_PAGES_PER_PAGE;
        }
 
        /*