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[stable-0.15,13/36] Fix X86 CPU topology in KVM mode

Message ID 1332939159-16434-14-git-send-email-afaerber@suse.de
State New
Headers show

Commit Message

Andreas Färber March 28, 2012, 12:52 p.m. UTC 
From: Bharata B Rao <bharata.rao@gmail.com>

apic id returned to guest kernel in ebx for cpuid(function=1) depends on
CPUX86State->cpuid_apic_id which gets populated after the cpuid information
is cached in the host kernel. This results in broken CPU topology in guest.

Fix this by setting cpuid_apic_id before cpuid information is passed to
the host kernel. This is done by moving the setting of cpuid_apic_id
to cpu_x86_init() where it will work for both KVM as well as TCG modes.

Acked-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Bharata B Rao <bharata.rao@gmail.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit f2209eb854a016eabc444b45f6d6b1636949141f)

Signed-off-by: Bruce Rogers <brogers@suse.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 hw/pc.c              |    1 -
 target-i386/helper.c |    1 +
 2 files changed, 1 insertions(+), 1 deletions(-)
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Patch

diff --git a/hw/pc.c b/hw/pc.c
index a3e8539..14ce684 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -931,7 +931,6 @@  static CPUState *pc_new_cpu(const char *cpu_model)
         exit(1);
     }
     if ((env->cpuid_features & CPUID_APIC) || smp_cpus > 1) {
-        env->cpuid_apic_id = env->cpu_index;
         env->apic_state = apic_init(env, env->cpuid_apic_id);
     }
     qemu_register_reset(pc_cpu_reset, env);
diff --git a/target-i386/helper.c b/target-i386/helper.c
index e9be104..829c1da 100644
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -1258,6 +1258,7 @@  CPUX86State *cpu_x86_init(const char *cpu_model)
         cpu_x86_close(env);
         return NULL;
     }
+    env->cpuid_apic_id = env->cpu_index;
     mce_init(env);
 
     qemu_init_vcpu(env);