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translate-all: exit from tb_phys_invalidate if qht_remove fails 

Two or more threads might race while invalidating the same TB. We currently
do not check for this at all despite taking tb_lock, which means we would
wrongly invalidate the same TB more than once. This bug has actually been
hit by users: I recently saw a report on IRC, although I have yet to see
the corresponding test case.

Fix this by using qht_remove as the synchronization point; if it fails,
that means the TB has already been invalidated, and therefore there
is nothing left to do in tb_phys_invalidate.

Note that this solution works now that we still have tb_lock, and will
continue working once we remove tb_lock.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1508445114-4717-1-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Emilio G. Cota 2017-10-19 16:31:54 -04:00 committed by Richard Henderson
parent 1c2adb958f
commit cc689485ee
1 changed files with 3 additions and 1 deletions
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4
accel/tcg/translate-all.c
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@ -1079,7 +1079,9 @@ void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr)
phys_pc = tb->page_addr[0] + (tb->pc & ~TARGET_PAGE_MASK);
h = tb_hash_func(phys_pc, tb->pc, tb->flags, tb->cflags & CF_HASH_MASK,
tb->trace_vcpu_dstate);
qht_remove(&tb_ctx.htable, tb, h);
if (!qht_remove(&tb_ctx.htable, tb, h)) {
return;
}
/* remove the TB from the page list */
if (tb->page_addr[0] != page_addr) {