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

..

coalesced_mmio.c

KVM: Add coalesced MMIO support (common part)

2008-07-20 12:42:31 +03:00

coalesced_mmio.h

KVM: Add coalesced MMIO support (common part)

2008-07-20 12:42:31 +03:00

ioapic.c

KVM: APIC: get rid of deliver_bitmask

2009-06-10 11:48:27 +03:00

ioapic.h

KVM: APIC: get rid of deliver_bitmask

2009-06-10 11:48:27 +03:00

iodev.h

KVM: kvm_io_device: extend in_range() to manage len and write attribute

2008-07-20 12:42:30 +03:00

iommu.c

KVM: Enable snooping control for supported hardware

2009-06-10 11:48:50 +03:00

irq_comm.c

KVM: Trivial format fix in setup_routing_entry()

2009-06-10 11:48:50 +03:00

kvm_main.c

KVM: protect concurrent make_all_cpus_request

2009-06-28 14:10:29 +03:00

kvm_trace.c

KVM: Prevent trace call into unloaded module text

2008-12-31 16:55:04 +02:00