[PATCH v5 3/5] x86/cpuid: Make clearcpuid an early param

From: Andi Kleen
Date: Thu Aug 17 2017 - 11:44:39 EST


From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

Make clearcpuid= an early param, to make sure it is parsed
before the XSAVE initialization. This allows to modify
XSAVE state by clearing specific CPUID bits.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/common.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 60b7aa6330ed..600e0cf714b9 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1285,7 +1285,7 @@ static __init int setup_disablecpuid(char *arg)

return 1;
}
-__setup("clearcpuid=", setup_disablecpuid);
+early_param("clearcpuid", setup_disablecpuid);

#ifdef CONFIG_X86_64
struct desc_ptr idt_descr __ro_after_init = {
--
2.9.4