From bc9158bd238cd9c2e2491949aa621d4fccbe2776 Mon Sep 17 00:00:00 2001
From: Stephen Marz <stephen.marz@utk.edu>
Date: Thu, 12 Mar 2020 13:36:18 -0400
Subject: [PATCH] Changed the queue size to only take one page.

---
 risc_v/ch9/src/virtio.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/risc_v/ch9/src/virtio.rs b/risc_v/ch9/src/virtio.rs
index 33b35ed..8bb6e86 100755
--- a/risc_v/ch9/src/virtio.rs
+++ b/risc_v/ch9/src/virtio.rs
@@ -17,7 +17,10 @@ pub const VIRTIO_AVAIL_F_NO_INTERRUPT: u16 = 1;
 
 pub const VIRTIO_USED_F_NO_NOTIFY: u16 = 1;
 
-pub const VIRTIO_RING_SIZE: usize = 256;
+// 157 is the maximum ring size so that the structure
+// takes up only 1 - 4KiB page. Kinda' an odd number,
+// but let's go with it.
+pub const VIRTIO_RING_SIZE: usize = 157;
 
 // VirtIO structures
 #[repr(C)]