x86_64 zero-extends 32bit xor to a full 64bit register. Use %k asm
operand modifier to force 32bit register and save 268 bytes in kvm.o
Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
---
arch/x86/kvm/vmx.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 552af5eba5bc..293a7f107c82 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -61,7 +61,7 @@
#define __ex(x) __kvm_handle_fault_on_reboot(x)
#define __ex_clear(x, reg) \
- ____kvm_handle_fault_on_reboot(x, "xor " reg " , " reg)
+ ____kvm_handle_fault_on_reboot(x, "xorl " reg " , " reg)
MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");
@@ -2315,7 +2315,7 @@ static __always_inline unsigned long __vmcs_readl(unsigned long field)
{
unsigned long value;
- asm volatile (__ex_clear("vmread %1, %0", "%0")
+ asm volatile (__ex_clear("vmread %1, %0", "%k0")
: "=r"(value) : "r"(field));
return value;
}
--
2.17.1
