i386: Allow KVM on i386 nonpae

Currently, CONFIG_X86_CMPXCHG64 both enables boot-time checking of
the cmpxchg64b feature and enables compilation of the set_64bit() family.
Since the option is dependent on PAE, and since KVM depends on set_64bit(),
this effectively disables KVM on i386 nopae.

Simplify by removing the config option altogether: the boot check is made
dependent on CONFIG_X86_PAE directly, and the set_64bit() family is exposed
without constraints.  It is up to users to check for the feature flag (KVM
does not as virtualiation extensions imply its existence).

Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 6 insertions, 10 deletions

diff --git a/include/asm-i386/cmpxchg.h b/include/asm-i386/cmpxchg.h
index 7adcef0cd53b..64dcdf46117b 100644
--- a/include/asm-i386/cmpxchg.h
+++ b/include/asm-i386/cmpxchg.h
@@ -3,14 +3,16 @@
 
 #include <linux/bitops.h> /* for LOCK_PREFIX */
 
+/*
+ * Note: if you use set64_bit(), __cmpxchg64(), or their variants, you
+ *       you need to test for the feature in boot_cpu_data.
+ */
+
 #define xchg(ptr,v) ((__typeof__(*(ptr)))__xchg((unsigned long)(v),(ptr),sizeof(*(ptr))))
 
 struct __xchg_dummy { unsigned long a[100]; };
 #define __xg(x) ((struct __xchg_dummy *)(x))
 
-
-#ifdef CONFIG_X86_CMPXCHG64
-
 /*
  * The semantics of XCHGCMP8B are a bit strange, this is why
  * there is a loop and the loading of %%eax and %%edx has to
@@ -65,8 +67,6 @@ static inline void __set_64bit_var (unsigned long long *ptr,
  __set_64bit(ptr, (unsigned int)(value), (unsigned int)((value)>>32ULL) ) : \
  __set_64bit(ptr, ll_low(value), ll_high(value)) )
 
-#endif
-
 /*
  * Note: no "lock" prefix even on SMP: xchg always implies lock anyway
  * Note 2: xchg has side effect, so that attribute volatile is necessary,
@@ -252,8 +252,6 @@ static inline unsigned long cmpxchg_386(volatile void *ptr, unsigned long old,
 })
 #endif
 
-#ifdef CONFIG_X86_CMPXCHG64
-
 static inline unsigned long long __cmpxchg64(volatile void *ptr, unsigned long long old,
                                       unsigned long long new)
 {
@@ -289,5 +287,3 @@ static inline unsigned long long __cmpxchg64_local(volatile void *ptr,
         ((__typeof__(*(ptr)))__cmpxchg64_local((ptr),(unsigned long long)(o),\
                                         (unsigned long long)(n)))
 #endif
-
-#endif
diff --git a/include/asm-i386/required-features.h b/include/asm-i386/required-features.h
index 65848a007050..618feb98f9f5 100644
--- a/include/asm-i386/required-features.h
+++ b/include/asm-i386/required-features.h
@@ -29,7 +29,7 @@
 # define NEED_CMOV      0
 #endif
 
-#ifdef CONFIG_X86_CMPXCHG64
+#ifdef CONFIG_X86_PAE
 # define NEED_CX8       (1<<(X86_FEATURE_CX8 & 31))
 #else
 # define NEED_CX8       0