KVM: VMX: Return 0 from a failed VMREAD
If we execute VMREAD during reboot we'll just skip over it. Instead of
returning garbage, return 0, which has a much smaller chance of confusing
the code. Otherwise we risk a flood of debug printk()s which block the
reboot process if a serial console or netconsole is enabled.
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index ab05ff6..f3693ca 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -565,10 +565,10 @@
static unsigned long vmcs_readl(unsigned long field)
{
- unsigned long value;
+ unsigned long value = 0;
asm volatile (__ex(ASM_VMX_VMREAD_RDX_RAX)
- : "=a"(value) : "d"(field) : "cc");
+ : "+a"(value) : "d"(field) : "cc");
return value;
}