From: Brian Kocoloski <briankoco@cs.pitt.edu>
Date: Sat, 14 Apr 2012 05:10:06 +0000 (-0400)
Subject: Added selective per CPU initialization option
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=commitdiff_plain;h=a2b48dd0c4f8ccfa633139bc2b9aa4ddf59eda5c;p=palacios.releases.git

Added selective per CPU initialization option
---

diff --git a/linux_module/main.c b/linux_module/main.c
index 62a0fb5..b24df34 100644
--- a/linux_module/main.c
+++ b/linux_module/main.c
@@ -5,6 +5,7 @@
 
 
 #include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/errno.h>
 #include <linux/percpu.h>
 #include <linux/fs.h>
@@ -28,6 +29,12 @@
 
 MODULE_LICENSE("GPL");
 
+// Module parameter
+int cpu_list[NR_CPUS] = {};
+int cpu_list_len = 0;
+module_param_array(cpu_list, int, &cpu_list_len, 0644);
+MODULE_PARM_DESC(cpu_list, "Comma-delimited list of CPUs that Palacios will run on");
+
 int mod_allocs = 0;
 int mod_frees = 0;
 
@@ -171,9 +178,7 @@ static int __init v3_init(void) {
 
     palacios_init_mm();
 
-
     // Initialize Palacios
-    
     palacios_vmm_init();
 
 
diff --git a/linux_module/palacios-stubs.c b/linux_module/palacios-stubs.c
index 2499339..c5b0ca0 100644
--- a/linux_module/palacios-stubs.c
+++ b/linux_module/palacios-stubs.c
@@ -36,6 +36,9 @@ static struct v3_vm_info * irq_to_guest_map[256];
 
 extern unsigned int cpu_khz;
 
+extern int cpu_list[NR_CPUS];
+extern int cpu_list_len;
+
 
 /**
  * Prints a message to the console.
@@ -496,12 +499,35 @@ static struct v3_os_hooks palacios_os_hooks = {
 
 int palacios_vmm_init( void )
 {
+    int num_cpus = num_online_cpus();
+    char * cpu_mask = NULL;
+
+    if (cpu_list_len > 0) {
+	int major = 0;
+	int minor = 0;
+	int i = 0;
+
+        cpu_mask = kmalloc((num_cpus / 8) + 1, GFP_KERNEL);
+	memset(cpu_mask, 0, (num_cpus / 8) + 1);
+        
+        for (i = 0; i < cpu_list_len; i++) {
+	    if (cpu_list[i] >= num_cpus) {
+		printk("CPU (%d) exceeds number of available CPUs. Ignoring...\n", cpu_list[i]);
+		continue;
+	    }
+
+            major = cpu_list[i] / 8;
+            minor = cpu_list[i] % 8;
     
+            *(cpu_mask + major) |= (0x1 << minor);
+        }
+    }
+
     memset(irq_to_guest_map, 0, sizeof(struct v3_vm_info *) * 256);
-    
+
     printk("palacios_init starting - calling init_v3\n");
     
-    Init_V3(&palacios_os_hooks, num_online_cpus());
+    Init_V3(&palacios_os_hooks, cpu_mask, num_cpus);
 
     return 0;
 
diff --git a/palacios/include/palacios/vmm.h b/palacios/include/palacios/vmm.h
index ee74ad6..7bfb97c 100644
--- a/palacios/include/palacios/vmm.h
+++ b/palacios/include/palacios/vmm.h
@@ -331,7 +331,7 @@ struct v3_interrupt {
 
 
 
-void Init_V3(struct v3_os_hooks * hooks,  int num_cpus);
+void Init_V3(struct v3_os_hooks * hooks, char * cpus, int num_cpus);
 void Shutdown_V3( void );
 
 
diff --git a/palacios/src/palacios/vmm.c b/palacios/src/palacios/vmm.c
index 8bd6c0a..cef9ff5 100644
--- a/palacios/src/palacios/vmm.c
+++ b/palacios/src/palacios/vmm.c
@@ -100,9 +100,10 @@ static void deinit_cpu(void * arg) {
 }
 
 
-
-void Init_V3(struct v3_os_hooks * hooks, int num_cpus) {
-    int i;
+void Init_V3(struct v3_os_hooks * hooks, char * cpu_mask, int num_cpus) {
+    int i = 0;
+    int minor = 0;
+    int major = 0;
 
     V3_Print("V3 Print statement to fix a Kitten page fault bug\n");
 
@@ -134,26 +135,26 @@ void Init_V3(struct v3_os_hooks * hooks, int num_cpus) {
     V3_init_checkpoint();
 #endif
 
-
-
-
     if ((hooks) && (hooks->call_on_cpu)) {
-	for (i = 0; i < num_cpus; i++) {
 
-	    V3_Print("Initializing VMM extensions on cpu %d\n", i);
-	    hooks->call_on_cpu(i, &init_cpu, (void *)(addr_t)i);
+        for (i = 0; i < num_cpus; i++) {
+            major = i / 8;
+            minor = i % 8;
 
-	    if (v3_mach_type == V3_INVALID_CPU) {
-		v3_mach_type = v3_cpu_types[i];
-	    }
+            if ((cpu_mask == NULL) || (*(cpu_mask + major) & (0x1 << minor))) {
+                V3_Print("Initializing VMM extensions on cpu %d\n", i);
+                hooks->call_on_cpu(i, &init_cpu, (void *)(addr_t)i);
 
-	}
+		if (v3_mach_type == V3_INVALID_CPU) {
+		    v3_mach_type = v3_cpu_types[i];
+		}   
+            }
+        }
     }
-
-
 }
 
 
+
 void Shutdown_V3() {
     int i;