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| author | Peter Maydell <peter.maydell@linaro.org> | 2019-02-05 15:18:10 +0000 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2019-02-06 03:39:24 +0000 |
| commit | 9fd9b7de61b24c70a8a82d9627a20ed95433e1b5 (patch) | |
| tree | 3e8e78d3202d681c68d1e655245b3b4fd4336642 | |
| parent | 7400d6938c6d455c4eba2b80c06d60c8fa5c5ba3 (diff) | |
| download | qemu-9fd9b7de61b24c70a8a82d9627a20ed95433e1b5.zip qemu-9fd9b7de61b24c70a8a82d9627a20ed95433e1b5.tar.gz qemu-9fd9b7de61b24c70a8a82d9627a20ed95433e1b5.tar.bz2 | |
accel/tcg: Consider cluster index in tb_lookup__cpu_state()
In commit f7b78602fdc6c6e4be we added the CPU cluster number to the
cflags field of the TB hash; this included adding it to the value
kept in tb->cflags, since we pass that field directly into the hash
calculation in some places. Unfortunately we forgot to check whether
other parts of the code were doing comparisons against tb->cflags
that would need to be updated.
It turns out that there is exactly one such place: the
tb_lookup__cpu_state() function checks whether the TB it has
found in the tb_jmp_cache has a tb->cflags matching the cf_mask
that is passed in. The tb->cflags has the cluster_index in it
but the cf_mask does not.
Hoist the "add cluster index to the cf_mask" code up from
tb_htable_lookup() to tb_lookup__cpu_state() so it can be considered
in the "did this TB match in the jmp cache" condition, as well as
when we do the full hash lookup by physical PC, flags, etc.
(tb_htable_lookup() is only called from tb_lookup__cpu_state(),
so this change doesn't require any further knock-on changes.)
Fixes: f7b78602fdc6c6e4be ("accel/tcg: Add cluster number to TCG TB hash")
Tested-by: Cleber Rosa <crosa@redhat.com>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reported-by: Howard Spoelstra <hsp.cat7@gmail.com>
Reported-by: Cleber Rosa <crosa@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20190205151810.571-1-peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
| -rw-r--r-- | accel/tcg/cpu-exec.c | 3 | ||||
| -rw-r--r-- | include/exec/tb-lookup.h | 4 |
2 files changed, 4 insertions, 3 deletions
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c index 7cf1292..60d87d5 100644 --- a/accel/tcg/cpu-exec.c +++ b/accel/tcg/cpu-exec.c @@ -325,9 +325,6 @@ TranslationBlock *tb_htable_lookup(CPUState *cpu, target_ulong pc, struct tb_desc desc; uint32_t h; - cf_mask &= ~CF_CLUSTER_MASK; - cf_mask |= cpu->cluster_index << CF_CLUSTER_SHIFT; - desc.env = (CPUArchState *)cpu->env_ptr; desc.cs_base = cs_base; desc.flags = flags; diff --git a/include/exec/tb-lookup.h b/include/exec/tb-lookup.h index 492cb68..26921b6 100644 --- a/include/exec/tb-lookup.h +++ b/include/exec/tb-lookup.h @@ -28,6 +28,10 @@ tb_lookup__cpu_state(CPUState *cpu, target_ulong *pc, target_ulong *cs_base, cpu_get_tb_cpu_state(env, pc, cs_base, flags); hash = tb_jmp_cache_hash_func(*pc); tb = atomic_rcu_read(&cpu->tb_jmp_cache[hash]); + + cf_mask &= ~CF_CLUSTER_MASK; + cf_mask |= cpu->cluster_index << CF_CLUSTER_SHIFT; + if (likely(tb && tb->pc == *pc && tb->cs_base == *cs_base && |