[PATCH v7 4/9] i386: Add new property to control cache info

[Babu Moger <babu.moger@xxxxxxx>]

This will be used to control the cache information.
By default new information will be displayed. If user
passes "-cpu legacy-cache" then older information will
be displayed even if the hardware supports new information.
It will be "on" for machine type "pc-q35-2.10" for compatibility.

Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
Tested-by: Geoffrey McRae <geoff@xxxxxxxxxxxxxxx>
---
 include/hw/i386/pc.h | 4 ++++
 target/i386/cpu.c    | 1 +
 target/i386/cpu.h    | 5 +++++
 3 files changed, 10 insertions(+)

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index ffee841..d904a3c 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -327,6 +327,10 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
         .driver   = "q35-pcihost",\
         .property = "x-pci-hole64-fix",\
         .value    = "off",\
+    },{\
+        .driver   = TYPE_X86_CPU,\
+        .property = "legacy-cache",\
+        .value    = "on",\
     },
 
 #define PC_COMPAT_2_9 \
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 5d88363..a27b658 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -5138,6 +5138,7 @@ static Property x86_cpu_properties[] = {
                      false),
     DEFINE_PROP_BOOL("vmware-cpuid-freq", X86CPU, vmware_cpuid_freq, true),
     DEFINE_PROP_BOOL("tcg-cpuid", X86CPU, expose_tcg, true),
+    DEFINE_PROP_BOOL("legacy-cache", X86CPU, legacy_cache, false),
 
     /*
      * From "Requirements for Implementing the Microsoft
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 1213bb7..852586a 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1395,6 +1395,11 @@ struct X86CPU {
      */
     bool enable_l3_cache;
 
+    /* Compatibility bits for old machine types.
+     * If true present the old cache topology information
+     */
+    bool legacy_cache;
+
     /* Compatibility bits for old machine types: */
     bool enable_cpuid_0xb;
 
-- 
2.7.4