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spapr_rng: fix race with main loop

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Since commit "60253ed1e6ec rng: add request queue support to rng-random",
the use of a spapr_rng device may hang vCPU threads.

The following path is taken without holding the lock to the main loop mutex:

h_random()
  rng_backend_request_entropy()
    rng_random_request_entropy()
      qemu_set_fd_handler()

The consequence is that entropy_available() may be called before the vCPU
thread could even queue the request: depending on the scheduling, it may
happen that entropy_available() does not call random_recv()->qemu_sem_post().
The vCPU thread will then sleep forever in h_random()->qemu_sem_wait().

This could not happen before 60253ed1e6ec because entropy_available() used
to call random_recv() unconditionally.

This patch ensures the lock is held to avoid the race.

Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Reviewed-by: Cédric Le Goater <clg@fr.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2016-03-11 19:48:47 +01:00 committed by David Gibson
parent c18ad9a54b
commit f1a6cf3ef7
1 changed files with 2 additions and 2 deletions
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4
hw/ppc/spapr_rng.c
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@ -77,13 +77,13 @@ static target_ulong h_random(PowerPCCPU *cpu, sPAPRMachineState *spapr,
hrdata.val.v64 = 0;
hrdata.received = 0;
qemu_mutex_unlock_iothread();
while (hrdata.received < 8) {
rng_backend_request_entropy(rngstate->backend, 8 - hrdata.received,
random_recv, &hrdata);
qemu_mutex_unlock_iothread();
qemu_sem_wait(&hrdata.sem);
qemu_mutex_lock_iothread();
}
qemu_mutex_lock_iothread();
qemu_sem_destroy(&hrdata.sem);
args[0] = hrdata.val.v64;