This reverts commit c65827770b5e7282b5fb9da29c1de85ed08e816e
Signed-off-by: Ryousei Takano <takano-ryousei@xxxxxxxxxx>
---
I am trying to run OpenMP (i.e., multi-threaded) programs using Intel
Math Kernel Library (MKL) on a guest OS. In the qemu-kvm-0.12.5,
my program works fine. In the qemu-kvm-0.13.0, however, it does not.
The Linux kernel is 2.6.32.28. The outputs of 'ps -L' are shown as follows:
qemu-kvm-0.12.5:
PID LWP TTY TIME CMD
2731 2731 pts/0 00:00:00 bash
2799 2799 pts/0 00:00:19 a.out
2799 2803 pts/0 00:00:00 a.out
2799 2804 pts/0 00:00:04 a.out <-
2799 2805 pts/0 00:00:03 a.out <- these threads are working properly.
2799 2806 pts/0 00:00:04 a.out <-
2807 2807 pts/0 00:00:00 ps
qemu-0.13.0:
PID LWP TTY TIME CMD
2725 2725 pts/0 00:00:00 bash
2748 2748 pts/0 00:00:19 a.out
2748 2752 pts/0 00:00:00 a.out
2748 2753 pts/0 00:00:00 a.out <-
2748 2754 pts/0 00:00:00 a.out <- these threads are blocked by
pthread_cond_wait(3).
2748 2755 pts/0 00:00:00 a.out <-
2756 2756 pts/0 00:00:00 ps
This problem seems to be introduced by the commit
c65827770b5e7282b5fb9da29c1de85ed08e816e.
The attached revert patch solves it. But I do not understand what is
happened;-)
Any comments and suggestions will be appreciated.
Regards,
Ryousei
hw/pc.c | 6 ++++++
target-i386/helper.c | 2 --
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/hw/pc.c b/hw/pc.c
index ec97181..577abe7 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -937,6 +937,12 @@ CPUState *pc_new_cpu(const char *cpu_model)
}
qemu_register_reset(pc_cpu_reset, env);
pc_cpu_reset(env);
+
+ /* kvm needs this to run after the apic is initialized. Otherwise,
+ * it can access invalid state and crash.
+ */
+ qemu_init_vcpu(env);
+
return env;
}
diff --git a/target-i386/helper.c b/target-i386/helper.c
index 86202e6..69cda5e 100644
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -1224,8 +1224,6 @@ CPUX86State *cpu_x86_init(const char *cpu_model)
}
mce_init(env);
- qemu_init_vcpu(env);
-
return env;
}
--
1.7.4.1
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