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cpu-exec: Do not invalidate original TB in cpu_exec_nocache()

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Instead of invalidating an original TB in cpu_exec_nocache()
prematurely, just save a link to it in the temporary generated TB. If
cpu_io_recompile() is raised subsequently from the temporary TB,
invalidate the original one as well. That allows reusing the original TB
each time cpu_exec_nocache() is called to handle expired instruction
counter in icount mode.

Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
Message-Id: <1435656909-29116-1-git-send-email-serge.fdrv@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sergey Fedorov 2015-06-30 12:35:09 +03:00 • committed by Paolo Bonzini
parent af103c9310
commit 02d57ea115
3 changed files with 12 additions and 6 deletions
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8
translate-all.c
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@ -1533,6 +1533,14 @@ void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr)
cs_base = tb->cs_base;
flags = tb->flags;
tb_phys_invalidate(tb, -1);
if (tb->cflags & CF_NOCACHE) {
if (tb->orig_tb) {
/* Invalidate original TB if this TB was generated in
* cpu_exec_nocache() */
tb_phys_invalidate(tb->orig_tb, -1);
}
tb_free(tb);
}
/* FIXME: In theory this could raise an exception. In practice
we have already translated the block once so it's probably ok. */
tb_gen_code(cpu, pc, cs_base, flags, cflags);