From: Borislav Petkov <bp@suse.de>
Date: Wed, 3 Feb 2016 11:33:40 +0000 (+0100)
Subject: x86/microcode/intel: Use *wrmsrl variants
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=c416e6117575213a5a962149620684a09f9e4ece;p=deliverable%2Flinux.git

x86/microcode/intel: Use *wrmsrl variants

... and drop the 32-bit casting games which we had to do at the time
because wrmsr() was unforgiving then, see c3fd0bd5e19a from the
full history tree:

  commit c3fd0bd5e19aaff9cdd104edff136a2023db657e
  Author: Linus Torvalds <torvalds@home.osdl.org>
  Date:   Tue Feb 17 23:23:41 2004 -0800

    Fix up the microcode update on regular 32-bit x86. Our wrmsr()
    is a bit unforgiving and really doesn't like 64-bit values.
    ...

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-13-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 35186a0dd5fc..ff0b44951d12 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -370,7 +370,7 @@ static int collect_cpu_info_early(struct ucode_cpu_info *uci)
 		native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
 		csig.pf = 1 << ((val[1] >> 18) & 7);
 	}
-	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+	native_wrmsrl(MSR_IA32_UCODE_REV, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
 	sync_core();
@@ -648,10 +648,8 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 		return 0;
 
 	/* write microcode via MSR 0x79 */
-	native_wrmsr(MSR_IA32_UCODE_WRITE,
-	      (unsigned long)mc->bits,
-	      (unsigned long)mc->bits >> 16 >> 16);
-	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+	native_wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
+	native_wrmsrl(MSR_IA32_UCODE_REV, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
 	sync_core();
@@ -860,10 +858,8 @@ static int apply_microcode_intel(int cpu)
 		return 0;
 
 	/* write microcode via MSR 0x79 */
-	wrmsr(MSR_IA32_UCODE_WRITE,
-	      (unsigned long) mc->bits,
-	      (unsigned long) mc->bits >> 16 >> 16);
-	wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+	wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
+	wrmsrl(MSR_IA32_UCODE_REV, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
 	sync_core();