Merge remote-tracking branch 'remotes/ehabkost/tags/x86-pull-request'…

… into staging x86: Haswell TSX blacklist fix for 2.9 # gpg: Signature made Fri 10 Mar 2017 18:45:08 GMT # gpg: using RSA key 0x2807936F984DC5A6 # gpg: Good signature from "Eduardo Habkost <[email protected]>" # Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF D1AA 2807 936F 984D C5A6 * remotes/ehabkost/tags/x86-pull-request: i386: Change stepping of Haswell to non-blacklisted value i386/kvm: Blacklist TSX on known broken hosts i386: host_vendor_fms() helper function Signed-off-by: Peter Maydell <[email protected]>
dreddy · Mar 13, 2017 · f962709 · f962709
2 parents b1616fe + ec56a4a
commit f962709
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Showing 4 changed files with 43 additions and 1 deletion.
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
@@ -389,6 +389,11 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
         .driver   = TYPE_X86_CPU,\
         .property = "vmware-cpuid-freq",\
         .value    = "off",\
+    },\
+    {\
+        .driver   = "Haswell-" TYPE_X86_CPU,\
+        .property = "stepping",\
+        .value    = "1",\
     },
 
 #define PC_COMPAT_2_7 \

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
@@ -688,6 +688,25 @@ void host_cpuid(uint32_t function, uint32_t count,
         *edx = vec[3];
 }
 
+void host_vendor_fms(char *vendor, int *family, int *model, int *stepping)
+{
+    uint32_t eax, ebx, ecx, edx;
+
+    host_cpuid(0x0, 0, &eax, &ebx, &ecx, &edx);
+    x86_cpu_vendor_words2str(vendor, ebx, edx, ecx);
+
+    host_cpuid(0x1, 0, &eax, &ebx, &ecx, &edx);
+    if (family) {
+        *family = ((eax >> 8) & 0x0F) + ((eax >> 20) & 0xFF);
+    }
+    if (model) {
+        *model = ((eax >> 4) & 0x0F) | ((eax & 0xF0000) >> 12);
+    }
+    if (stepping) {
+        *stepping = eax & 0x0F;
+    }
+}
+
 /* CPU class name definitions: */
 
 #define X86_CPU_TYPE_SUFFIX "-" TYPE_X86_CPU
@@ -1177,7 +1196,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .vendor = CPUID_VENDOR_INTEL,
         .family = 6,
         .model = 60,
-        .stepping = 1,
+        .stepping = 4,
         .features[FEAT_1_EDX] =
             CPUID_VME | CPUID_SSE2 | CPUID_SSE | CPUID_FXSR | CPUID_MMX |
             CPUID_CLFLUSH | CPUID_PSE36 | CPUID_PAT | CPUID_CMOV | CPUID_MCA |

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
@@ -1440,6 +1440,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
 void cpu_clear_apic_feature(CPUX86State *env);
 void host_cpuid(uint32_t function, uint32_t count,
                 uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx);
+void host_vendor_fms(char *vendor, int *family, int *model, int *stepping);
 
 /* helper.c */
 int x86_cpu_handle_mmu_fault(CPUState *cpu, vaddr addr,

diff --git a/target/i386/kvm.c b/target/i386/kvm.c
@@ -266,6 +266,19 @@ static int get_para_features(KVMState *s)
     return features;
 }
 
+static bool host_tsx_blacklisted(void)
+{
+    int family, model, stepping;\
+    char vendor[CPUID_VENDOR_SZ + 1];
+
+    host_vendor_fms(vendor, &family, &model, &stepping);
+
+    /* Check if we are running on a Haswell host known to have broken TSX */
+    return !strcmp(vendor, CPUID_VENDOR_INTEL) &&
+           (family == 6) &&
+           ((model == 63 && stepping < 4) ||
+            model == 60 || model == 69 || model == 70);
+}
 
 /* Returns the value for a specific register on the cpuid entry
  */
@@ -349,6 +362,10 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s, uint32_t function,
         }
     } else if (function == 6 && reg == R_EAX) {
         ret |= CPUID_6_EAX_ARAT; /* safe to allow because of emulated APIC */
+    } else if (function == 7 && index == 0 && reg == R_EBX) {
+        if (host_tsx_blacklisted()) {
+            ret &= ~(CPUID_7_0_EBX_RTM | CPUID_7_0_EBX_HLE);
+        }
     } else if (function == 0x80000001 && reg == R_EDX) {
         /* On Intel, kvm returns cpuid according to the Intel spec,
          * so add missing bits according to the AMD spec: