From: Peter Dinda <pdinda@northwestern.edu>
Date: Fri, 20 Jan 2012 19:08:17 +0000 (-0600)
Subject: More detailed error handling on msr writes
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=commitdiff_plain;h=785e74aa4828251a93deb9f05bebd3c84a45d0c2;p=palacios.git

More detailed error handling on msr writes
---

diff --git a/palacios/src/palacios/vmm_msr.c b/palacios/src/palacios/vmm_msr.c
index bb1b062..2329f53 100644
--- a/palacios/src/palacios/vmm_msr.c
+++ b/palacios/src/palacios/vmm_msr.c
@@ -64,9 +64,13 @@ int v3_handle_msr_write(struct guest_info * info) {
 	msr_val.lo = info->vm_regs.rax;
 	msr_val.hi = info->vm_regs.rdx;
 	
-	if (hook->write(info, msr_num, msr_val, hook->priv_data) == -1) {
-	    PrintError("Error in MSR hook Write\n");
-	    return -1;
+	if (hook->write) {
+	    if (hook->write(info, msr_num, msr_val, hook->priv_data) == -1) {
+		PrintError("Error in MSR hook Write\n");
+		return -1;
+	    }
+	} else {
+	    PrintError("No write hook exists for msr 0x%x\n",msr_num);
 	}
     }