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target-arm/powerctl: defer cpu reset work to CPU context

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When switching a new vCPU on we want to complete a bunch of the setup
work before we start scheduling the vCPU thread. To do this cleanly we
defer vCPU setup to async work which will run the vCPUs execution
context as the thread is woken up. The scheduling of the work will kick
the vCPU awake.

This avoids potential races in MTTCG system emulation.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alex Bennée
2017-02-23 18:29:23 +00:00
parent c3b9a07a33
commit 062ba099e0
7 changed files with 201 additions and 74 deletions
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4
target/arm/psci.c
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@@ -127,7 +127,9 @@ void arm_handle_psci_call(ARMCPU *cpu)
break;
}
target_cpu = ARM_CPU(target_cpu_state);
ret = target_cpu->powered_off ? 1 : 0;
g_assert(qemu_mutex_iothread_locked());
ret = target_cpu->power_state;
break;
default:
/* Everything above affinity level 0 is always on. */