From: Alex Bennée <alex.ben...@linaro.org>
We keep track of translations but can only do so up until the
translation cache is flushed. At that point we really have no idea if
we can re-create a translation because all the active tracking
information has been reset.
Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
Signed-off-by: Fei Wu <fei2...@intel.com>
---
accel/tcg/tb-maint.c | 1 +
accel/tcg/tb-stats.c | 19 +++++++++++++++++++
include/exec/tb-stats.h | 8 ++++++++
3 files changed, 28 insertions(+)
diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index 0980fca358..11ff0ddd90 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -763,6 +763,7 @@ static void do_tb_flush(CPUState *cpu, run_on_cpu_data
tb_flush_count)
qht_reset_size(&tb_ctx.htable, CODE_GEN_HTABLE_SIZE);
tb_remove_all();
+ tbstats_reset_tbs();
tcg_region_reset_all();
/* XXX: flush processor icache at this point if cache flush is expensive */
qatomic_inc(&tb_ctx.tb_flush_count);
diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c
index 805e1fc74d..139f049ffc 100644
--- a/accel/tcg/tb-stats.c
+++ b/accel/tcg/tb-stats.c
@@ -267,6 +267,25 @@ void do_hmp_tbstats_safe(CPUState *cpu, run_on_cpu_data
icmd)
g_free(cmdinfo);
}
+/*
+ * We have to reset the tbs array on a tb_flush as those
+ * TranslationBlocks no longer exist and we no loner know if the
+ * current mapping is still valid.
+ */
+
+static void reset_tbs_array(void *p, uint32_t hash, void *userp)
+{
+ TBStatistics *tbs = p;
+ g_ptr_array_set_size(tbs->tbs, 0);
+}
+
+void tbstats_reset_tbs(void)
+{
+ if (tb_ctx.tb_stats.map) {
+ qht_iter(&tb_ctx.tb_stats, reset_tbs_array, NULL);
+ }
+}
+
void init_tb_stats_htable(void)
{
if (!tb_ctx.tb_stats.map && tb_stats_collection_enabled()) {
diff --git a/include/exec/tb-stats.h b/include/exec/tb-stats.h
index 4bb343870b..30b788f7b2 100644
--- a/include/exec/tb-stats.h
+++ b/include/exec/tb-stats.h
@@ -124,4 +124,12 @@ struct TbstatsCommand {
void do_hmp_tbstats_safe(CPUState *cpu, run_on_cpu_data icmd);
+/**
+ * tbstats_reset_tbs: reset the linked array of TBs
+ *
+ * Reset the list of tbs for a given array. Should be called from
+ * safe work during tb_flush.
+ */
+void tbstats_reset_tbs(void);
+
#endif
--
2.25.1
