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authorAvi Kivity <avi@redhat.com>2010-12-02 17:52:50 +0200
committerAvi Kivity <avi@redhat.com>2011-01-12 11:30:18 +0200
commitb7c4145ba2eb0717db0ddac1b5f7f48012189c53 (patch)
tree9b259970f56451ecb0f5d84ecd81d67386f63224 /arch/x86/include/asm/kvm_host.h
parent4cc703100b1fd97c71804e2fa5c9c377c5b37dc5 (diff)
KVM: Don't spin on virt instruction faults during reboot
Since vmx blocks INIT signals, we disable virtualization extensions during reboot. This leads to virtualization instructions faulting; we trap these faults and spin while the reboot continues. Unfortunately spinning on a non-preemptible kernel may block a task that reboot depends on; this causes the reboot to hang. Fix by skipping over the instruction and hoping for the best. Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/kvm_host.h')
-rw-r--r--arch/x86/include/asm/kvm_host.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 56e45a2ed2de..d968cc501799 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -786,14 +786,18 @@ enum {
* reboot turns off virtualization while processes are running.
* Trap the fault and ignore the instruction if that happens.
*/
-asmlinkage void kvm_handle_fault_on_reboot(void);
+asmlinkage void kvm_spurious_fault(void);
+extern bool kvm_rebooting;
#define __kvm_handle_fault_on_reboot(insn) \
"666: " insn "\n\t" \
+ "668: \n\t" \
".pushsection .fixup, \"ax\" \n" \
"667: \n\t" \
+ "cmpb $0, kvm_rebooting \n\t" \
+ "jne 668b \n\t" \
__ASM_SIZE(push) " $666b \n\t" \
- "jmp kvm_handle_fault_on_reboot \n\t" \
+ "call kvm_spurious_fault \n\t" \
".popsection \n\t" \
".pushsection __ex_table, \"a\" \n\t" \
_ASM_PTR " 666b, 667b \n\t" \