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tcg: comment on which functions have to be called with tb_lock held

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softmmu requires more functions to be thread-safe, because translation
blocks can be invalidated from e.g. notdirty callbacks.  Probably the
same holds for user-mode emulation, it's just that no one has ever
tried to produce a coherent locking there.

This patch will guide the introduction of more tb_lock and tb_unlock
calls for system emulation.

Note that after this patch some (most) of the mentioned functions are
still called outside tb_lock/tb_unlock.  The next one will rectify this.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-Id: <20161027151030.20863-7-alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-10-27 16:10:03 +01:00
parent 4426f83a9a
commit 7d7500d998
4 changed files with 29 additions and 5 deletions
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3
include/qom/cpu.h
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@ -319,7 +319,10 @@ struct CPUState {
MemoryRegion *memory;
void *env_ptr; /* CPUArchState */
/* Writes protected by tb_lock, reads not thread-safe */
struct TranslationBlock *tb_jmp_cache[TB_JMP_CACHE_SIZE];
struct GDBRegisterState *gdb_regs;
int gdb_num_regs;
int gdb_num_g_regs;