d9ec18a0fc
After system startup, run the update to memory_dispatch and the tlb_flush on the cpu. This eliminates a race, wherein a running cpu sees the memory_dispatch change but has not yet seen the tlb_flush. Since the update now happens on the cpu, we need not use qatomic_rcu_read to protect the read of memory_dispatch. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1826 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1834 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1846 Tested-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> (cherry picked from commit 0d58c660689f6da1e3feff8a997014003d928b3b) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/*
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* emulator main execution loop
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*
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* Copyright (c) 2003-2005 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "sysemu/cpus.h"
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#include "sysemu/tcg.h"
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#include "exec/exec-all.h"
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#include "qemu/plugin.h"
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#include "internal.h"
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bool tcg_allowed;
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/* exit the current TB, but without causing any exception to be raised */
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void cpu_loop_exit_noexc(CPUState *cpu)
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{
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cpu->exception_index = -1;
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cpu_loop_exit(cpu);
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}
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void cpu_loop_exit(CPUState *cpu)
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{
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/* Undo the setting in cpu_tb_exec. */
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cpu->can_do_io = 1;
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/* Undo any setting in generated code. */
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qemu_plugin_disable_mem_helpers(cpu);
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siglongjmp(cpu->jmp_env, 1);
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}
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void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc)
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{
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if (pc) {
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cpu_restore_state(cpu, pc);
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}
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cpu_loop_exit(cpu);
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}
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void cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc)
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{
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/* Prevent looping if already executing in a serial context. */
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g_assert(!cpu_in_serial_context(cpu));
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cpu->exception_index = EXCP_ATOMIC;
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cpu_loop_exit_restore(cpu, pc);
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}
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