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Groups > linux.kernel > #1654681

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

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From: Andi Kleen <ak@linux.intel.com>

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@linux.intel.com>
---
 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

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[PATCH 1/5] x86/xsave: Move xsave initialization to after parsing early parameters Andi Kleen <andi@firstfloor.org> - 2017-06-01 00:30 +0200
  [PATCH 4/5] x86/xsave: Make XSAVE check the base CPUID features before enabling Andi Kleen <andi@firstfloor.org> - 2017-06-01 00:30 +0200
  [PATCH 3/5] x86/cpuid: Make clearcpuid an early param Andi Kleen <andi@firstfloor.org> - 2017-06-01 00:30 +0200
  [PATCH 2/5] x86/cpuid: Add generic table for cpuid dependencies Andi Kleen <andi@firstfloor.org> - 2017-06-01 00:30 +0200
    Re: [PATCH 2/5] x86/cpuid: Add generic table for cpuid dependencies kbuild test robot <lkp@intel.com> - 2017-06-04 06:20 +0200
      Re: [PATCH 2/5] x86/cpuid: Add generic table for cpuid dependencies Andi Kleen <ak@linux.intel.com> - 2017-06-06 01:00 +0200
  [PATCH 5/5] x86/xsave: Using generic CPUID clearing when disabling XSAVE Andi Kleen <andi@firstfloor.org> - 2017-06-01 00:30 +0200

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