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translate: early exit in tb_flush if there is no tcg

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tb_flush does all kind of things, which are very tcg specific. As it
is called from some places even for KVM (e.g. gdb server) it is better
to detect these cases and do an early exit.
This also fixes a crash in the gdb server that was triggered by
commit 909eaac9bbc2 ("tb hash: track translated blocks with qht").

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Reported-by: Richard Henderson <rth@twiddle.net>
Reported-by: Brent Baccala <cosine@freesoft.org>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-id: 1472148686-39841-1-git-send-email-borntraeger@de.ibm.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Christian Borntraeger 2016-08-25 20:11:26 +02:00 committed by Peter Maydell
parent b69a553b4a
commit 135a972b45
1 changed files with 3 additions and 0 deletions
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3
translate-all.c
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@ -834,6 +834,9 @@ static void page_flush_tb(void)
/* XXX: tb_flush is currently not thread safe */
void tb_flush(CPUState *cpu)
{
if (!tcg_enabled()) {
return;
}
#if defined(DEBUG_FLUSH)
printf("qemu: flush code_size=%ld nb_tbs=%d avg_tb_size=%ld\n",
(unsigned long)(tcg_ctx.code_gen_ptr - tcg_ctx.code_gen_buffer),