From 99ce2407227bd5474e69c93ab0f061f2a3438eac Mon Sep 17 00:00:00 2001
From: Eduardo Habkost <ehabkost@redhat.com>
Date: Fri, 2 Aug 2013 14:08:52 +0200
Subject: target-i386: Disable PMU CPUID leaf by default

RH-Author: Eduardo Habkost <ehabkost@redhat.com>
Message-id: <1375452533-12507-3-git-send-email-ehabkost@redhat.com>
Patchwork-id: 52933
O-Subject: [RHEL-7 PATCH 2/3] target-i386: Disable PMU CPUID leaf by default
Bugzilla: 853101
RH-Acked-by: Bandan Das <bsd@redhat.com>
RH-Acked-by: Markus Armbruster <armbru@redhat.com>
RH-Acked-by: Gleb Natapov <gleb@redhat.com>

Bugzilla: 853101

Bug description: QEMU currently gets all bits from GET_SUPPORTED_CPUID
for CPUID leaf 0xA and passes them directly to the guest. This makes
the guest ABI depend on host kernel and host CPU capabilities, and
breaks live migration if we migrate between hosts with different
capabilities (e.g., different number of PMU counters).

Add a "pmu" property to X86CPU, and set it to true only on "-cpu host",
or on pc-*-1.5 and older machine-types.

For now, setting pmu=on will enable the current passthrough mode that
doesn't have any ABI stability guarantees, but in the future we may
implement a mode where the PMU CPUID bits are stable and configurable.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
(cherry picked from commit 9337e3b6e1d779215423d9b419d42200506deaab)
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

Conflicts:
	include/hw/i386/pc.h
	target-i386/cpu.c

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 6692728..45487ba 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -211,6 +211,10 @@ int e820_add_entry(uint64_t, uint64_t, uint32_t);
             .driver   = "Nehalem-" TYPE_X86_CPU,\
             .property = "level",\
             .value    = stringify(2),\
+        },{\
+            .driver = TYPE_X86_CPU,\
+            .property = "pmu",\
+            .value = "on",\
         }
 
 #define PC_COMPAT_1_4 \
diff --git a/target-i386/cpu-qom.h b/target-i386/cpu-qom.h
index 849cedf..5231005 100644
--- a/target-i386/cpu-qom.h
+++ b/target-i386/cpu-qom.h
@@ -68,6 +68,13 @@ typedef struct X86CPU {
 
     /* Features that were filtered out because of missing host capabilities */
     uint32_t filtered_features[FEATURE_WORDS];
+
+    /* Enable PMU CPUID bits. This can't be enabled by default yet because
+     * it doesn't have ABI stability guarantees, as it passes all PMU CPUID
+     * bits returned by GET_SUPPORTED_CPUID (that depend on host CPU and kernel
+     * capabilities) directly to the guest.
+     */
+    bool enable_pmu;
 } X86CPU;
 
 static inline X86CPU *x86_env_get_cpu(CPUX86State *env)
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 0c9a99a..2bcc21e 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -1479,6 +1479,7 @@ static int cpu_x86_find_by_name(X86CPU *cpu, x86_def_t *x86_cpu_def,
                                 const char *name)
 {
     x86_def_t *def;
+    Error *err = NULL;
     int i;
 
     if (name == NULL) {
@@ -1486,6 +1487,8 @@ static int cpu_x86_find_by_name(X86CPU *cpu, x86_def_t *x86_cpu_def,
     }
     if (kvm_enabled() && strcmp(name, "host") == 0) {
         kvm_cpu_fill_host(x86_cpu_def);
+        object_property_set_bool(OBJECT(cpu), true, "pmu", &err);
+        assert_no_error(err);
         return 0;
     }
 
@@ -2017,7 +2020,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
         break;
     case 0xA:
         /* Architectural Performance Monitoring Leaf */
-        if (kvm_enabled()) {
+        if (kvm_enabled() && cpu->enable_pmu) {
             KVMState *s = cs->kvm_state;
 
             *eax = kvm_arch_get_supported_cpuid(s, 0xA, count, R_EAX);
@@ -2506,6 +2509,11 @@ static int64_t x86_cpu_get_arch_id(CPUState *cs)
     return env->cpuid_apic_id;
 }
 
+static Property x86_cpu_properties[] = {
+    DEFINE_PROP_BOOL("pmu", X86CPU, enable_pmu, false),
+    DEFINE_PROP_END_OF_LIST()
+};
+
 static void x86_cpu_common_class_init(ObjectClass *oc, void *data)
 {
     X86CPUClass *xcc = X86_CPU_CLASS(oc);
@@ -2515,6 +2523,7 @@ static void x86_cpu_common_class_init(ObjectClass *oc, void *data)
     xcc->parent_realize = dc->realize;
     dc->realize = x86_cpu_realizefn;
     dc->bus_type = TYPE_ICC_BUS;
+    dc->props = x86_cpu_properties;
 
     xcc->parent_reset = cc->reset;
     cc->reset = x86_cpu_reset;