Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 cpu updates from Ingo Molnar:
 "The main changes in this cycle were:

   - Improved CPU ID handling code and related enhancements (Borislav
     Petkov)

   - RDRAND fix (Len Brown)"

* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: Replace RDRAND forced-reseed with simple sanity check
  x86/MSR: Chop off lower 32-bit value
  x86/cpu: Fix MSR value truncation issue
  x86/cpu/amd, kvm: Satisfy guest kernel reads of IC_CFG MSR
  kvm: Add accessors for guest CPU's family, model, stepping
  x86/cpu: Unify CPU family, model, stepping calculation

1 files changed, 4 insertions, 9 deletions

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 4d5279c95d5f..37830de8f60a 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -581,14 +581,9 @@ void cpu_detect(struct cpuinfo_x86 *c)
                 u32 junk, tfms, cap0, misc;
 
                 cpuid(0x00000001, &tfms, &misc, &junk, &cap0);
-                c->x86 = (tfms >> 8) & 0xf;
-                c->x86_model = (tfms >> 4) & 0xf;
-                c->x86_mask = tfms & 0xf;
-
-                if (c->x86 == 0xf)
-                        c->x86 += (tfms >> 20) & 0xff;
-                if (c->x86 >= 0x6)
-                        c->x86_model += ((tfms >> 16) & 0xf) << 4;
+                c->x86          = x86_family(tfms);
+                c->x86_model    = x86_model(tfms);
+                c->x86_mask     = x86_stepping(tfms);
 
                 if (cap0 & (1<<19)) {
                         c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
@@ -1187,7 +1182,7 @@ void syscall_init(void)
          * They both write to the same internal register. STAR allows to
          * set CS/DS but only a 32bit target. LSTAR sets the 64bit rip.
          */
-        wrmsrl(MSR_STAR,  ((u64)__USER32_CS)<<48  | ((u64)__KERNEL_CS)<<32);
+        wrmsr(MSR_STAR, 0, (__USER32_CS << 16) | __KERNEL_CS);
         wrmsrl(MSR_LSTAR, (unsigned long)entry_SYSCALL_64);
 
 #ifdef CONFIG_IA32_EMULATION