On 11/10/2018 19:40, Uros Bizjak wrote:
> 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;
> }
>
Queued all three, thanks!
Paolo
