[Qemu-devel] [PATCH qom-cpu 3/3] target-i386: set level=4 on Conroe/Penryn/Nehalem

[Eduardo Habkost <ehabkost@redhat.com>]

The CPUID level value on Conroe, Penryn, and Nehalem are too low. This
causes at least one known problem: the -smp "threads" option doesn't
work as expect if level is < 4, because thread count information is
provided to the guest on CPUID[EAX=4,ECX=2].EAX

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
Testing: those level values have been in use on Red Hat Enterprise Linux
since version 6.0 (released in 2010). The fix wasn't submitted to QEMU
earlier because we didn't have a good mechanism and clear procedure to
update CPUID values of existing CPU models in QEMU.
---
 include/hw/i386/pc.h | 12 ++++++++++++
 target-i386/cpu.c    |  6 +++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 8883b37..4351f39 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -188,13 +188,25 @@ int e820_add_entry(uint64_t, uint64_t, uint32_t);
             .property = "model",\
             .value    = stringify(2),\
         },{\
+            .driver   = "Conroe-" TYPE_X86_CPU,\
+            .property = "level",\
+            .value    = stringify(2),\
+        },{\
             .driver   = "Penryn-" TYPE_X86_CPU,\
             .property = "model",\
             .value    = stringify(2),\
         },{\
+            .driver   = "Penryn-" TYPE_X86_CPU,\
+            .property = "level",\
+            .value    = stringify(2),\
+        },{\
             .driver   = "Nehalem-" TYPE_X86_CPU,\
             .property = "model",\
             .value    = stringify(2),\
+        },{\
+            .driver   = "Nehalem-" TYPE_X86_CPU,\
+            .property = "level",\
+            .value    = stringify(2),\
         }
 
 #define PC_COMPAT_1_4 \
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 6b48562..762baad 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -669,7 +669,7 @@ static x86_def_t builtin_x86_defs[] = {
     },
     {
         .name = "Conroe",
-        .level = 2,
+        .level = 4,
         .vendor = CPUID_VENDOR_INTEL,
         .family = 6,
         .model = 15,
@@ -691,7 +691,7 @@ static x86_def_t builtin_x86_defs[] = {
     },
     {
         .name = "Penryn",
-        .level = 2,
+        .level = 4,
         .vendor = CPUID_VENDOR_INTEL,
         .family = 6,
         .model = 23,
@@ -714,7 +714,7 @@ static x86_def_t builtin_x86_defs[] = {
     },
     {
         .name = "Nehalem",
-        .level = 2,
+        .level = 4,
         .vendor = CPUID_VENDOR_INTEL,
         .family = 6,
         .model = 26,
-- 
1.8.1.4