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Thu, 14 Aug 2025 06:05:08 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, Pierrick Bouvier Subject: [PATCH v3 75/85] linux-user/aarch64: Allocate new gcs stack on clone Date: Thu, 14 Aug 2025 22:57:42 +1000 Message-ID: <20250814125752.164107-76-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250814125752.164107-1-richard.henderson@linaro.org> References: <20250814125752.164107-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::42a; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x42a.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1755177946999116600 Content-Type: text/plain; charset="utf-8" Allocate the new stack early, so that error reporting need not clean up other objects. Reviewed-by: Pierrick Bouvier Signed-off-by: Richard Henderson --- linux-user/syscall.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 2f1e881046..91210775ed 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -6652,6 +6652,21 @@ static int do_fork(CPUArchState *env, unsigned int f= lags, abi_ulong newsp, ts =3D g_new0(TaskState, 1); init_task_state(ts); =20 +#ifdef TARGET_AARCH64 + /* + * If GCS is enabled in the parent thread, it is also enabled + * in the child thread, but with a newly allocated stack. + */ + abi_long new_gcspr =3D 0; + if (env->cp15.gcscr_el[0] & GCSCR_PCRSEL) { + new_gcspr =3D gcs_new_stack(ts); + if (new_gcspr =3D=3D -1) { + g_free(ts); + return -TARGET_ENOMEM; + } + } +#endif + /* Grab a mutex so that thread setup appears atomic. */ pthread_mutex_lock(&clone_lock); =20 @@ -6676,6 +6691,11 @@ static int do_fork(CPUArchState *env, unsigned int f= lags, abi_ulong newsp, ts->info =3D parent_ts->info; ts->signal_mask =3D parent_ts->signal_mask; =20 +#ifdef TARGET_AARCH64 + ts->gcs_el0_locked =3D parent_ts->gcs_el0_locked; + new_env->cp15.gcspr_el[0] =3D new_gcspr; +#endif + if (flags & CLONE_CHILD_CLEARTID) { ts->child_tidptr =3D child_tidptr; } --=20 2.43.0