From: Peter Dinda <pdinda@northwestern.edu>
Date: Tue, 15 Nov 2011 00:43:42 +0000 (-0600)
Subject: Assure that unhandled MSR reads get back zeros
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=commitdiff_plain;h=639f3d3bd42dd2218bcd994e423f3a5569ed7051;p=palacios.git

Assure that unhandled MSR reads get back zeros
---

diff --git a/palacios/src/palacios/vmm_msr.c b/palacios/src/palacios/vmm_msr.c
index bb1b062..4163145 100644
--- a/palacios/src/palacios/vmm_msr.c
+++ b/palacios/src/palacios/vmm_msr.c
@@ -104,12 +104,15 @@ int v3_handle_msr_read(struct guest_info * info) {
 
 
 int v3_msr_unhandled_read(struct guest_info * core, uint32_t msr, struct v3_msr * dst, void * priv_data) {
-    V3_Print("Palacios: Unhandled MSR Read (MSR=0x%x)\n", msr);
+    V3_Print("Palacios: Unhandled MSR Read (MSR=0x%x) - returning zero\n", msr);
+    dst->lo=dst->hi=0;
+    // should produce GPF for unsupported msr
     return 0;
 }
 
 int v3_msr_unhandled_write(struct guest_info * core, uint32_t msr, struct v3_msr src, void * priv_data) {
-    V3_Print("Palacios: Unhandled MSR Write (MSR=0x%x)\n", msr);
+    V3_Print("Palacios: Unhandled MSR Write (MSR=0x%x) - ignored\n", msr);
+    // should produce GPF for unsupported msr
     return 0;
 }