1 files changed, 18 insertions, 0 deletions

diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index d84a852e4cd7..c689d19e35ab 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -26,6 +26,7 @@
 #include <linux/kdebug.h>
 #include <asm/smp.h>
 #include <asm/reboot.h>
+#include <asm/virtext.h>
 
 #include <mach_ipi.h>
 
@@ -49,6 +50,15 @@ static void kdump_nmi_callback(int cpu, struct die_args *args)
 #endif
         crash_save_cpu(regs, cpu);
 
+        /* Disable VMX or SVM if needed.
+         *
+         * We need to disable virtualization on all CPUs.
+         * Having VMX or SVM enabled on any CPU may break rebooting
+         * after the kdump kernel has finished its task.
+         */
+        cpu_emergency_vmxoff();
+        cpu_emergency_svm_disable();
+
         disable_local_APIC();
 }
 
@@ -80,6 +90,14 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
         local_irq_disable();
 
         kdump_nmi_shootdown_cpus();
+
+        /* Booting kdump kernel with VMX or SVM enabled won't work,
+         * because (among other limitations) we can't disable paging
+         * with the virt flags.
+         */
+        cpu_emergency_vmxoff();
+        cpu_emergency_svm_disable();
+
         lapic_shutdown();
 #if defined(CONFIG_X86_IO_APIC)
         disable_IO_APIC();