On 12/4/23 12:09, Michal Suchánek wrote:
On Mon, Dec 04, 2023 at 02:50:17PM -0500, Stefan Hajnoczi wrote:
On Mon, 4 Dec 2023 at 14:40, Philippe Mathieu-Daudé <phi...@linaro.org> wrote:
+void tcg_unregister_thread(void)
+    unsigned int n;
+    n = qatomic_fetch_dec(&tcg_cur_ctxs);
+    g_free(tcg_ctxs[n]);
+    qatomic_set(&tcg_ctxs[n], NULL);

tcg_ctxs[n] may not be our context, so this looks like it could free
another thread's context and lead to undefined behavior.


There is cpu->thread_id so perhaps cpu->thread_ctx could be added as
well. That would require a bitmap of used threads contexts rather than a
counter, though.

Or don't free the context at all, but re-use it when incrementing and tcg_ctxs[n] != null (i.e. plugging in a repacement vcpu). After all, there can only be tcg_max_ctxs contexts.


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