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authorEduardo Habkost <ehabkost@redhat.com>2013-07-26 17:09:36 -0300
committerAndreas Färber <afaerber@suse.de>2013-07-29 15:29:16 +0200
commit9337e3b6e1d779215423d9b419d42200506deaab (patch)
treed5238219ae8b6a15a0f43ed26d2b613aae21f8b6 /target-i386/cpu-qom.h
parentc139911261c5acc9dae56b1180db320ba25636bd (diff)
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target-i386: Disable PMU CPUID leaf by default
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>
Diffstat (limited to 'target-i386/cpu-qom.h')
-rw-r--r--target-i386/cpu-qom.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/target-i386/cpu-qom.h b/target-i386/cpu-qom.h
index 60d2b5d..53b4c34 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)