Marcelo Tosatti 84261923d3 KVM: protect concurrent make_all_cpus_request ... make_all_cpus_request contains a race condition which can trigger false request completed status, as follows: CPU0 CPU1 if (test_and_set_bit(req,&vcpu->requests)) .... if (test_and_set_bit(req,&vcpu->requests)) .. return proceed to smp_call_function_many(wait=1) Use a spinlock to serialize concurrent CPUs. Cc: stable@kernel.org Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>		2009-06-28 14:10:29 +03:00
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kvm	KVM: protect concurrent make_all_cpus_request	2009-06-28 14:10:29 +03:00