From: Jack Lange <jacklange@cs.pitt.edu>
Date: Thu, 27 Oct 2011 17:55:36 +0000 (-0400)
Subject: added error checking to guest launch to handle core mapping bugs
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=commitdiff_plain;h=f82ccce5ce7629dce6f1a6feee8b47fa13a6756d

added error checking to guest launch to handle core mapping bugs
---

diff --git a/linux_module/palacios-stubs.c b/linux_module/palacios-stubs.c
index 21aa4fd..2499339 100644
--- a/linux_module/palacios-stubs.c
+++ b/linux_module/palacios-stubs.c
@@ -218,7 +218,11 @@ palacios_start_thread_on_cpu(int cpu_id,
 	return NULL;
     }
 
-    set_cpus_allowed_ptr(thread, cpumask_of(cpu_id));
+    if (set_cpus_allowed_ptr(thread, cpumask_of(cpu_id)) != 0) {
+	kthread_stop(thread);
+	return NULL;
+    }
+
     wake_up_process(thread);
 
     return thread;
diff --git a/linux_module/vm.c b/linux_module/vm.c
index 9869334..a1af564 100644
--- a/linux_module/vm.c
+++ b/linux_module/vm.c
@@ -130,7 +130,7 @@ static long v3_vm_ioctl(struct file * filp,
 	case V3_VM_LAUNCH: {
 	    printk("palacios: launching vm\n");
 
-	    if (v3_start_vm(guest->v3_ctx, 0xfffffffe) < 0) { 
+	    if (v3_start_vm(guest->v3_ctx, (0x1 << num_online_cpus()) - 1) < 0) { 
 		printk("palacios: launch of vm failed\n");
 		return -1;
 	    }
diff --git a/palacios/src/palacios/vmm.c b/palacios/src/palacios/vmm.c
index 8b4eed5..afc8c1c 100644
--- a/palacios/src/palacios/vmm.c
+++ b/palacios/src/palacios/vmm.c
@@ -255,7 +255,11 @@ int v3_start_vm(struct v3_vm_info * vm, unsigned int cpu_mask) {
 	int minor = i % 8;
 	
 	if (core_mask[major] & (0x1 << minor)) {
-	    avail_cores++;
+	    if (v3_cpu_types[i] == V3_INVALID_CPU) {
+		core_mask[major] &= ~(0x1 << minor);
+	    } else {
+		avail_cores++;
+	    }
 	}
     }
 
@@ -323,6 +327,12 @@ int v3_start_vm(struct v3_vm_info * vm, unsigned int cpu_mask) {
 	vcore_id--;
     }
 
+    if (vcore_id >= 0) {
+	PrintError("Error starting VM: Not enough available CPU cores\n");
+	v3_stop_vm(vm);
+	return -1;
+    }
+
 
     return 0;