[PATCH] xen: fix ring resize of /dev/evtchn

[Jan Beulich]

The copying of ring data was wrong for two cases: For a full ring
nothing got copied at all (as in that case the canonicalized producer
and consumer indexes are identical). And in case one or both of the
canonicalized (after the resize) indexes would point into the second
half of the buffer, the copied data ended up in the wrong (free) part
of the new buffer. In both cases uninitialized data would get passed
back to the caller.

Fix this by simply copying the old ring contents twice: Once to the
low half of the new buffer, and a second time to the high half.

This addresses the inability to boot a HVM guest with 64 or more
vCPU-s, which was reported by Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx>.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 drivers/xen/evtchn.c |   22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

--- 4.6-rc6/drivers/xen/evtchn.c
+++ 4.6-rc6-xen-dev-evtchn-resize/drivers/xen/evtchn.c
@@ -316,7 +316,6 @@ static int evtchn_resize_ring(struct per
 {
 	unsigned int new_size;
 	evtchn_port_t *new_ring, *old_ring;
-	unsigned int p, c;
 
 	/*
 	 * Ensure the ring is large enough to capture all possible
@@ -344,22 +343,13 @@ static int evtchn_resize_ring(struct per
 	spin_lock_irq(&u->ring_prod_lock);
 
 	/*
-	 * Copy the old ring contents to the new ring.
-	 *
-	 * If the ring contents crosses the end of the current ring,
-	 * it needs to be copied in two chunks.
-	 *
-	 * +---------+    +------------------+
-	 * |34567  12| -> |       1234567    |
-	 * +-----p-c-+    +------------------+
+	 * Copy the old ring contents to the new ring. To take care of
+	 * wrapping, a full ring, and the new canonicalized index pointing
+	 * into the second half, simply copy the old contents twice.
 	 */
-	p = evtchn_ring_offset(u, u->ring_prod);
-	c = evtchn_ring_offset(u, u->ring_cons);
-	if (p < c) {
-		memcpy(new_ring + c, u->ring + c, (u->ring_size - c) * sizeof(*u->ring));
-		memcpy(new_ring + u->ring_size, u->ring, p * sizeof(*u->ring));
-	} else
-		memcpy(new_ring + c, u->ring + c, (p - c) * sizeof(*u->ring));
+	memcpy(new_ring, old_ring, u->ring_size * sizeof(*u->ring));
+	memcpy(new_ring + u->ring_size, old_ring,
+	       u->ring_size * sizeof(*u->ring));
 
 	u->ring = new_ring;
 	u->ring_size = new_size;