File 20059-vmx-nmi-handling.patch of Package xen

# HG changeset patch
# User Keir Fraser <keir.fraser@citrix.com>
# Date 1250243912 -3600
# Node ID 76a65bf2aa4d0b27fb55e85cc2d9ce8b9ff1bbf3
# Parent  c8beb04afbf0a7a3a4290df212d1b7fe7d288dca
VMX: issue an NMI rather than just calling the NMI handler
when the VMEXIT code indicates that an NMI has been raised.
Otherwise we might hit a real NMI while in the handler.

Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>

--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -843,8 +843,6 @@ static void vmx_set_tsc_offset(struct vc
     vmx_vmcs_exit(v);
 }
 
-void do_nmi(struct cpu_user_regs *);
-
 static void vmx_init_hypercall_page(struct domain *d, void *hypercall_page)
 {
     char *p;
@@ -2161,7 +2159,7 @@ asmlinkage void vmx_vmexit_handler(struc
                  (X86_EVENTTYPE_NMI << 8) )
                 goto exit_and_crash;
             HVMTRACE_0D(NMI, v);
-            do_nmi(regs); /* Real NMI, vector 2: normal processing. */
+            self_nmi(); /* Real NMI, vector 2: normal processing. */
             break;
         case TRAP_machine_check:
             HVMTRACE_0D(MCE, v);
--- a/xen/arch/x86/nmi.c
+++ b/xen/arch/x86/nmi.c
@@ -441,18 +441,22 @@ void nmi_watchdog_tick(struct cpu_user_r
  * 8-3 and 8-4 in IA32 Reference Manual Volume 3. We send the IPI to
  * our own APIC ID explicitly which is valid.
  */
-static void do_nmi_trigger(unsigned char key)
+void self_nmi(void) 
 {
     u32 id = get_apic_id();
 
-    printk("Triggering NMI on APIC ID %x\n", id);
-
     local_irq_disable();
     apic_wait_icr_idle();
     apic_icr_write(APIC_DM_NMI | APIC_DEST_PHYSICAL, id);
     local_irq_enable();
 }
 
+static void do_nmi_trigger(unsigned char key)
+{
+    printk("Triggering NMI on APIC ID %x\n", get_apic_id());
+    self_nmi();
+}
+
 static void do_nmi_stats(unsigned char key)
 {
     int i;
--- a/xen/include/asm-x86/apic.h
+++ b/xen/include/asm-x86/apic.h
@@ -196,6 +196,7 @@ extern void setup_secondary_APIC_clock (
 extern void setup_apic_nmi_watchdog (void);
 extern int reserve_lapic_nmi(void);
 extern void release_lapic_nmi(void);
+extern void self_nmi(void);
 extern void disable_timer_nmi_watchdog(void);
 extern void enable_timer_nmi_watchdog(void);
 extern void nmi_watchdog_tick (struct cpu_user_regs *regs);