56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
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/*
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* Accelerator blocking API, to prevent new ioctls from starting and wait the
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* running ones finish.
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* This mechanism differs from pause/resume_all_vcpus() in that it does not
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* release the BQL.
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*
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* Copyright (c) 2022 Red Hat Inc.
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*
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* Author: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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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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#ifndef ACCEL_BLOCKER_H
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#define ACCEL_BLOCKER_H
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#include "sysemu/cpus.h"
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extern void accel_blocker_init(void);
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/*
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* accel_{cpu_}ioctl_begin/end:
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* Mark when ioctl is about to run or just finished.
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*
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* accel_{cpu_}ioctl_begin will block after accel_ioctl_inhibit_begin() is
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* called, preventing new ioctls to run. They will continue only after
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* accel_ioctl_inibith_end().
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*/
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extern void accel_ioctl_begin(void);
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extern void accel_ioctl_end(void);
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extern void accel_cpu_ioctl_begin(CPUState *cpu);
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extern void accel_cpu_ioctl_end(CPUState *cpu);
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/*
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* accel_ioctl_inhibit_begin: start critical section
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*
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* This function makes sure that:
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* 1) incoming accel_{cpu_}ioctl_begin() calls block
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* 2) wait that all ioctls that were already running reach
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* accel_{cpu_}ioctl_end(), kicking vcpus if necessary.
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*
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* This allows the caller to access shared data or perform operations without
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* worrying of concurrent vcpus accesses.
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*/
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extern void accel_ioctl_inhibit_begin(void);
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/*
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* accel_ioctl_inhibit_end: end critical section started by
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* accel_ioctl_inhibit_begin()
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*
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* This function allows blocked accel_{cpu_}ioctl_begin() to continue.
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*/
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extern void accel_ioctl_inhibit_end(void);
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#endif /* ACCEL_BLOCKER_H */
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