[Qemu-devel] [PULL v2 4/5] target-i386: Don't enable nested VMX by default

[Andreas Färber]

From: Eduardo Habkost <address@hidden>

TCG doesn't support VMX, and nested VMX is not enabled by default in the
KVM kernel module.

So, there's no reason to have VMX enabled by default on the core2duo and
coreduo CPU models, today. Even the newer Intel CPU model definitions
don't have it enabled.

In this case, we need machine-type compat code, as people may be running
the older machine-types on hosts that had VMX nesting enabled.

Signed-off-by: Eduardo Habkost <address@hidden>
Signed-off-by: Andreas Färber <address@hidden>
---
 hw/i386/pc_piix.c | 2 ++
 hw/i386/pc_q35.c  | 2 ++
 target-i386/cpu.c | 8 ++++----
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 87601ee..8de85c3 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -306,6 +306,8 @@ static void pc_init_pci(MachineState *machine)
 static void pc_compat_2_1(MachineState *machine)
 {
     smbios_uuid_encoded = false;
+    x86_cpu_compat_set_features("coreduo", FEAT_1_ECX, CPUID_EXT_VMX, 0);
+    x86_cpu_compat_set_features("core2duo", FEAT_1_ECX, CPUID_EXT_VMX, 0);
 }
 
 static void pc_compat_2_0(MachineState *machine)
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 2044b62..fd8593b 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -285,6 +285,8 @@ static void pc_q35_init(MachineState *machine)
 static void pc_compat_2_1(MachineState *machine)
 {
     smbios_uuid_encoded = false;
+    x86_cpu_compat_set_features("coreduo", FEAT_1_ECX, CPUID_EXT_VMX, 0);
+    x86_cpu_compat_set_features("core2duo", FEAT_1_ECX, CPUID_EXT_VMX, 0);
 }
 
 static void pc_compat_2_0(MachineState *machine)
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 0c41b92..b731832 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -718,10 +718,10 @@ static X86CPUDefinition builtin_x86_defs[] = {
             CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA |
             CPUID_PSE36 | CPUID_VME | CPUID_ACPI | CPUID_SS,
         /* Missing: CPUID_EXT_DTES64, CPUID_EXT_DSCPL, CPUID_EXT_EST,
-         * CPUID_EXT_TM2, CPUID_EXT_XTPR, CPUID_EXT_PDCM */
+         * CPUID_EXT_TM2, CPUID_EXT_XTPR, CPUID_EXT_PDCM, CPUID_EXT_VMX */
         .features[FEAT_1_ECX] =
             CPUID_EXT_SSE3 | CPUID_EXT_MONITOR | CPUID_EXT_SSSE3 |
-            CPUID_EXT_VMX | CPUID_EXT_CX16,
+            CPUID_EXT_CX16,
         .features[FEAT_8000_0001_EDX] =
             CPUID_EXT2_LM | CPUID_EXT2_SYSCALL | CPUID_EXT2_NX,
         .features[FEAT_8000_0001_ECX] =
@@ -802,9 +802,9 @@ static X86CPUDefinition builtin_x86_defs[] = {
             CPUID_MTRR | CPUID_CLFLUSH | CPUID_MCA | CPUID_ACPI |
             CPUID_SS,
         /* Missing: CPUID_EXT_EST, CPUID_EXT_TM2 , CPUID_EXT_XTPR,
-         * CPUID_EXT_PDCM */
+         * CPUID_EXT_PDCM, CPUID_EXT_VMX */
         .features[FEAT_1_ECX] =
-            CPUID_EXT_SSE3 | CPUID_EXT_MONITOR | CPUID_EXT_VMX,
+            CPUID_EXT_SSE3 | CPUID_EXT_MONITOR,
         .features[FEAT_8000_0001_EDX] =
             CPUID_EXT2_NX,
         .xlevel = 0x80000008,
-- 
1.8.4.5