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From: Andi Kleen <andi@firstfloor.org>
To: x86@kernel.org
Cc: linux-kernel@vger.kernel.org, Andi Kleen <ak@linux.intel.com>
Subject: [PATCH v9 3/5] x86/cpuid: Make clearcpuid an early param
Date: Fri,  6 Oct 2017 17:03:26 -0700	[thread overview]
Message-ID: <20171007000328.12843-4-andi@firstfloor.org> (raw)
In-Reply-To: <20171007000328.12843-1-andi@firstfloor.org>

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.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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 fd47692e5ce9..ff51c61d2df0 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1310,7 +1310,7 @@ static __init int setup_disablecpuid(char *arg)
 
 	return 1;
 }
-__setup("clearcpuid=", setup_disablecpuid);
+early_param("clearcpuid", setup_disablecpuid);
 
 #ifdef CONFIG_X86_64
 DEFINE_PER_CPU_FIRST(union irq_stack_union,
-- 
2.13.6

  parent reply	other threads:[~2017-10-07  0:03 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-07  0:03 Support generic disabling of all XSAVE features Andi Kleen
2017-10-07  0:03 ` [PATCH v9 1/5] x86/xsave: Move xsave initialization to after parsing early parameters Andi Kleen
2017-10-12  7:18   ` Ingo Molnar
2017-10-07  0:03 ` [PATCH v9 2/5] x86/cpuid: Add generic table for cpuid dependencies Andi Kleen
2017-10-08  8:35   ` Thomas Gleixner
2017-10-12  8:07   ` Ingo Molnar
2017-10-12  8:16     ` Ingo Molnar
2017-10-13 17:46       ` Andi Kleen
2017-10-12 15:13     ` Thomas Gleixner
2017-10-12 22:01       ` Andi Kleen
2017-10-13  5:30       ` Ingo Molnar
2017-10-13 16:36         ` Andi Kleen
2017-10-12 22:12     ` Andi Kleen
2017-10-07  0:03 ` Andi Kleen [this message]
2017-10-12  8:09   ` [PATCH v9 3/5] x86/cpuid: Make clearcpuid an early param Ingo Molnar
2017-10-07  0:03 ` [PATCH v9 4/5] x86/xsave: Make XSAVE check the base CPUID features before enabling Andi Kleen
2017-10-08  8:34   ` Thomas Gleixner
2017-10-12  8:11   ` Ingo Molnar
2017-10-13 17:48     ` Andi Kleen
2017-10-07  0:03 ` [PATCH v9 5/5] x86/xsave: Remove the explicit clearing of XSAVE dependend features Andi Kleen

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