kdump: forcibly disable VMX and SVM on machine_crash_shutdown() (2340b62f) · Commits · 戴 / test

We need to disable virtualization extensions on all CPUs before booting the kdump kernel, otherwise the kdump kernel booting will fail, and rebooting after the kdump kernel did its task may also fail. We do it using cpu_emergency_vmxoff() and cpu_emergency_svm_disable(), that should always work, because those functions check if the CPUs support SVM or VMX before doing their tasks. Signed-off-by:

Eduardo Habkost <ehabkost@redhat.com> Signed-off-by:

Avi Kivity <avi@redhat.com>

arch/x86/kernel/crash.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -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();

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