x86: kvm: use alternatives for VMCALL vs. VMMCALL if kernel text is read-only

[pandora-kernel.git] / arch / x86 / kernel / cpu / amd.c

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index c7e46cb..2d44a28 100644 (file)
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -148,7 +148,6 @@ static void __cpuinit init_amd_k6(struct cpuinfo_x86 *c)
 
 static void __cpuinit amd_k7_smp_check(struct cpuinfo_x86 *c)
 {
-#ifdef CONFIG_SMP
        /* calling is from identify_secondary_cpu() ? */
        if (!c->cpu_index)
                return;
@@ -192,7 +191,6 @@ static void __cpuinit amd_k7_smp_check(struct cpuinfo_x86 *c)
 
 valid_k7:
        ;
-#endif
 }
 
 static void __cpuinit init_amd_k7(struct cpuinfo_x86 *c)
@@ -442,8 +440,6 @@ static void __cpuinit bsp_init_amd(struct cpuinfo_x86 *c)
 
 static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
 {
-       u32 dummy;
-
        early_init_amd_mc(c);
 
        /*
@@ -474,11 +470,18 @@ static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
        }
 #endif
 
-       rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
+       /*
+        * This is only needed to tell the kernel whether to use VMCALL
+        * and VMMCALL.  VMMCALL is never executed except under virt, so
+        * we can set it unconditionally.
+        */
+       set_cpu_cap(c, X86_FEATURE_VMMCALL);
 }
 
 static void __cpuinit init_amd(struct cpuinfo_x86 *c)
 {
+       u32 dummy;
+
 #ifdef CONFIG_SMP
        unsigned long long value;
 
@@ -573,6 +576,38 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
                }
        }
 
+       /* re-enable TopologyExtensions if switched off by BIOS */
+       if ((c->x86 == 0x15) &&
+           (c->x86_model >= 0x10) && (c->x86_model <= 0x1f) &&
+           !cpu_has(c, X86_FEATURE_TOPOEXT)) {
+               u64 val;
+
+               if (!rdmsrl_amd_safe(0xc0011005, &val)) {
+                       val |= 1ULL << 54;
+                       wrmsrl_amd_safe(0xc0011005, val);
+                       rdmsrl(0xc0011005, val);
+                       if (val & (1ULL << 54)) {
+                               set_cpu_cap(c, X86_FEATURE_TOPOEXT);
+                               printk(KERN_INFO FW_INFO "CPU: Re-enabling "
+                                 "disabled Topology Extensions Support\n");
+                       }
+               }
+       }
+
+       /*
+        * The way access filter has a performance penalty on some workloads.
+        * Disable it on the affected CPUs.
+        */
+       if ((c->x86 == 0x15) &&
+           (c->x86_model >= 0x02) && (c->x86_model < 0x20)) {
+               u64 val;
+
+               if (!rdmsrl_safe(0xc0011021, &val) && !(val & 0x1E)) {
+                       val |= 0x1E;
+                       checking_wrmsrl(0xc0011021, val);
+               }
+       }
+
        cpu_detect_cache_sizes(c);
 
        /* Multi core CPU? */
@@ -657,6 +692,8 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
                        checking_wrmsrl(MSR_AMD64_MCx_MASK(4), mask);
                }
        }
+
+       rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
 }
 
 #ifdef CONFIG_X86_32