[COMMIT master] KVM: VMX: Return 0 from a failed VMREAD

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Avi Kivity <avi@xxxxxxxxxx>

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@xxxxxxxxxx>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index caa967e..72cfdb7 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -565,10 +565,10 @@ static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa)
 
 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;
 }
 
--
To unsubscribe from this list: send the line "unsubscribe kvm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [KVM Development]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Walks]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux