062ba099e0
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>
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/*
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* QEMU support -- ARM Power Control specific functions.
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*
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* Copyright (c) 2016 Jean-Christophe Dubois
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_ARM_POWERCTL_H
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#define QEMU_ARM_POWERCTL_H
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#include "kvm-consts.h"
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#define QEMU_ARM_POWERCTL_RET_SUCCESS QEMU_PSCI_RET_SUCCESS
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#define QEMU_ARM_POWERCTL_INVALID_PARAM QEMU_PSCI_RET_INVALID_PARAMS
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#define QEMU_ARM_POWERCTL_ALREADY_ON QEMU_PSCI_RET_ALREADY_ON
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#define QEMU_ARM_POWERCTL_IS_OFF QEMU_PSCI_RET_DENIED
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#define QEMU_ARM_POWERCTL_ON_PENDING QEMU_PSCI_RET_ON_PENDING
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/*
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* arm_get_cpu_by_id:
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* @cpuid: the id of the CPU we want to retrieve the state
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*
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* Retrieve a CPUState object from its CPU ID provided in @cpuid.
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*
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* Returns: a pointer to the CPUState structure of the requested CPU.
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*/
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CPUState *arm_get_cpu_by_id(uint64_t cpuid);
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/*
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* arm_set_cpu_on:
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* @cpuid: the id of the CPU we want to start/wake up.
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* @entry: the address the CPU shall start from.
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* @context_id: the value to put in r0/x0.
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* @target_el: The desired exception level.
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* @target_aa64: 1 if the requested mode is AArch64. 0 otherwise.
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*
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* Start the cpu designated by @cpuid in @target_el exception level. The mode
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* shall be AArch64 if @target_aa64 is set to 1. Otherwise the mode is
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* AArch32. The CPU shall start at @entry with @context_id in r0/x0.
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*
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* Returns: QEMU_ARM_POWERCTL_RET_SUCCESS on success.
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* QEMU_ARM_POWERCTL_INVALID_PARAM if bad parameters are provided.
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* QEMU_ARM_POWERCTL_ALREADY_ON if the CPU was already started.
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* QEMU_ARM_POWERCTL_ON_PENDING if the CPU is still powering up
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*/
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int arm_set_cpu_on(uint64_t cpuid, uint64_t entry, uint64_t context_id,
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uint32_t target_el, bool target_aa64);
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/*
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* arm_set_cpu_off:
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* @cpuid: the id of the CPU we want to stop/shut down.
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*
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* Stop the cpu designated by @cpuid.
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*
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* Returns: QEMU_ARM_POWERCTL_RET_SUCCESS on success.
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* QEMU_ARM_POWERCTL_INVALID_PARAM if bad parameters are provided.
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* QEMU_ARM_POWERCTL_IS_OFF if CPU is already off
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*/
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int arm_set_cpu_off(uint64_t cpuid);
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/*
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* arm_reset_cpu:
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* @cpuid: the id of the CPU we want to reset.
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*
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* Reset the cpu designated by @cpuid.
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*
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* Returns: QEMU_ARM_POWERCTL_RET_SUCCESS on success.
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* QEMU_ARM_POWERCTL_INVALID_PARAM if bad parameters are provided.
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* QEMU_ARM_POWERCTL_IS_OFF if CPU is off
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*/
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int arm_reset_cpu(uint64_t cpuid);
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#endif
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