[EMAIL PROTECTED] wrote:
Hello again,
I attempted to install Windows XP(sp2) as a guest and it crashes with a blank
window and "QEMU/KVM[Stopped]" in the title. The install starts fine
with -no-kvm. Below is the output from /proc/version, /proc/cpuinfo and
dmesg. I am using kvm-49. Also, the only way to get rid of qemu
dmesg output:
BUG: using smp_processor_id() in preemptible [00000001] code:
qemu-system-x86/9551
caller is kvm_flush_remote_tlbs+0x6c/0x140 [kvm]
[<c02602ed>] debug_smp_processor_id+0xad/0xb0
[<f984e10c>] kvm_flush_remote_tlbs+0x6c/0x140 [kvm]
Does the attached patch help?
--
Any sufficiently difficult bug is indistinguishable from a feature.
diff --git a/kernel/external-module-compat.h b/kernel/external-module-compat.h
index 6fd0ef6..5d5fd60 100644
--- a/kernel/external-module-compat.h
+++ b/kernel/external-module-compat.h
@@ -464,15 +464,17 @@ static inline int kvm_smp_call_function_mask(cpumask_t mask,
cpumask_t allbutself;
int cpus;
int cpu;
+ int me;
+ me = get_cpu();
allbutself = cpu_online_map;
- cpu_clear(smp_processor_id(), allbutself);
+ cpu_clear(me, allbutself);
cpus_and(mask, mask, allbutself);
cpus = cpus_weight(mask);
if (!cpus)
- return 0;
+ goto out;
data.func = func;
data.info = info;
@@ -490,12 +492,14 @@ static inline int kvm_smp_call_function_mask(cpumask_t mask,
}
if (!wait)
- return 0;
+ goto out;
while (atomic_read(&data.finished) != cpus) {
cpu_relax();
barrier();
}
+out:
+ put_cpu();
return 0;
}
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