Changeset 21955 in vbox

Timestamp:

Aug 4, 2009 1:35:06 PM (16 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

50652

Message:

Linux host driver: workaround for the 2.6.31 performance counter framework initializing the LVTPC APIC vector as NMI

Location:

trunk/src/VBox

Files:

• HostDrivers/Support/linux/SUPDrv-linux.c (modified) (2 diffs)
• Installer/linux/vboxdrv.sh.in (modified) (1 diff)

trunk/src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c

@@ -488 +488 @@
             if ((GET_APIC_DELIVERY_MODE(v) == APIC_MODE_NMI) && !(v & APIC_LVT_MASKED))
             {
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31) && defined(CONFIG_PERF_COUNTERS)
+                /* 2.6.31+: The performance counter framework will initialize the LVTPC
+                 * vector as NMI. We can't disable the framework but the kernel loader
+                 * script will do 'echo 2 > /proc/sys/kernel/perf_counter_paranoid'
+                 * which hopefilly prevents any usage of hardware performance counters
+                 * and therefore triggering of NMIs. */
+                printk(KERN_ERR DEVICE_NAME
+                       ": Warning: 2.6.31+ kernel detected. Most likely the hwardware performance\n"
+                                DEVICE_NAME
+                       ": counter framework which can generate NMIs is active. You have to prevent\n"
+                                DEVICE_NAME
+                       ": the usage of hardware performance counters by\n"
+                                DEVICE_NAME
+                       ":   echo 2 > /proc/sys/kernel/perf_counter_paranoid\n");
+                /* We can't do more here :-( */
+                goto no_error;
+# endif
+
 # if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19) || defined CONFIG_X86_64
                 printk(KERN_ERR DEVICE_NAME
@@ -509 +527 @@
 # if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
     printk(KERN_DEBUG DEVICE_NAME ": Successfully done.\n");
+no_error:
 # endif /* >= 2.6.19 */
 #endif /* CONFIG_X86_LOCAL_APIC */

trunk/src/VBox/Installer/linux/vboxdrv.sh.in

@@ -153 +153 @@
         if ! rm -f $DEVICE; then
             failure "Cannot remove $DEVICE"
+        fi
+        # HACK: disable the hardware performance counter framework
+        if [ -e /proc/sys/kernel/perf_counter_paranoid ]; then
+          echo 2 > /proc/sys/kernel/perf_counter_paranoid 
         fi
         if ! modprobe vboxdrv > /dev/null 2>&1; then