From: Alex Williamson <alex.williamson@hp.com>
Date: Mon, 22 Oct 2007 18:30:17 +0000 (-0600)
Subject: [IA64] Fix MMIO readb operation
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14848
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=985a9ce9dc643acb194f76169439ba449ee2a790;p=xen.git

[IA64] Fix MMIO readb operation

We should do clean before read operation.  Otherwise, read one byte
data may get garbage data sometimes.

Signed-off-by: Zhang Xin <xing.z.zhang@intel.com>
---

diff --git a/xen/arch/ia64/vmx/mmio.c b/xen/arch/ia64/vmx/mmio.c
index 17d3a6ee3d..c6fc8ac215 100644
--- a/xen/arch/ia64/vmx/mmio.c
+++ b/xen/arch/ia64/vmx/mmio.c
@@ -120,6 +120,8 @@ static void low_mmio_access(VCPU *vcpu, u64 pa, u64 *val, size_t s, int dir)
     p->dir = dir;
     if (dir==IOREQ_WRITE)     // write;
         p->data = *val;
+    else if (dir == IOREQ_READ)
+        p->data = 0;          // clear all bits
     p->data_is_ptr = 0;
     p->type = 1;
     p->df = 0;