Unbreak large mem support by removing kqemu

kqemu introduces a number of restrictions on the i386 target.  The worst is that
it prevents large memory from working in the default build.

Furthermore, kqemu is fundamentally flawed in a number of ways.  It relies on
the TSC as a time source which will not be reliable on a multiple processor
system in userspace.  Since most modern processors are multicore, this severely
limits the utility of kqemu.

kvm is a viable alternative for people looking to accelerate qemu and has the
benefit of being supported by the upstream Linux kernel.  If someone can
implement work arounds to remove the restrictions introduced by kqemu, I'm
happy to avoid and/or revert this patch.

N.B. kqemu will still function in the 0.11 series but this patch removes it from
the 0.12 series.

Paul, please Ack or Nack this patch.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

target-i386/helper.c

@@ -995,15 +995,11 @@ target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
 
 /* XXX: This value should match the one returned by CPUID
  * and in exec.c */
-#if defined(CONFIG_KQEMU)
-#define PHYS_ADDR_MASK 0xfffff000LL
-#else
 # if defined(TARGET_X86_64)
 # define PHYS_ADDR_MASK 0xfffffff000LL
 # else
 # define PHYS_ADDR_MASK 0xffffff000LL
 # endif
-#endif
 
 /* return value:
    -1 = cannot handle fault
@@ -1743,21 +1739,13 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
 /* XXX: This value must match the one used in the MMU code. */ 
         if (env->cpuid_ext2_features & CPUID_EXT2_LM) {
             /* 64 bit processor */
-#if defined(CONFIG_KQEMU)
-            *eax = 0x00003020;	/* 48 bits virtual, 32 bits physical */
-#else
 /* XXX: The physical address space is limited to 42 bits in exec.c. */
             *eax = 0x00003028;	/* 48 bits virtual, 40 bits physical */
-#endif
         } else {
-#if defined(CONFIG_KQEMU)
-            *eax = 0x00000020;	/* 32 bits physical */
-#else
             if (env->cpuid_features & CPUID_PSE36)
                 *eax = 0x00000024; /* 36 bits physical */
             else
                 *eax = 0x00000020; /* 32 bits physical */
-#endif
         }
         *ebx = 0;
         *ecx = 0;
@@ -1833,9 +1821,6 @@ CPUX86State *cpu_x86_init(const char *cpu_model)
     }
     mce_init(env);
     cpu_reset(env);
-#ifdef CONFIG_KQEMU
-    kqemu_init(env);
-#endif
 
     qemu_init_vcpu(env);