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Mon, 28 Jul 2025 11:16:54 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: mjt@tls.msk.ru, Fabiano Rosas , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Peter Maydell Subject: [PATCH 1/9] target/arm/sme: Reorg SME access handling in handle_msr_i() Date: Mon, 28 Jul 2025 08:16:42 -1000 Message-ID: <20250728181650.165114-2-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250728181650.165114-1-richard.henderson@linaro.org> References: <20250728181650.165114-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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::434; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x434.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: 1753726835374116600 Signed-off-by: Richard Henderson Reviewed-by: Fabiano Rosas Signed-off-by: Philippe Mathieu-Daud=C3=A9 Message-id: 20230112102436.1913-2-philmd@linaro.org Message-Id: <20230112004322.161330-1-richard.henderson@linaro.org> [PMD: Split patch in multiple tiny steps] Signed-off-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Peter Maydell (cherry picked from commit 535ca76425fc1ffa4311b3a47518b06c596a55c6) --- target/arm/translate-a64.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c index 7210a9cc4d..b66561a5cf 100644 --- a/target/arm/translate-a64.c +++ b/target/arm/translate-a64.c @@ -1855,18 +1855,20 @@ static void handle_msr_i(DisasContext *s, uint32_t = insn, goto do_unallocated; } if (sme_access_check(s)) { - bool i =3D crm & 1; - bool changed =3D false; + int old =3D s->pstate_sm | (s->pstate_za << 1); + int new =3D (crm & 1) * 3; + int msk =3D (crm >> 1) & 3; =20 - if ((crm & 2) && i !=3D s->pstate_sm) { - gen_helper_set_pstate_sm(cpu_env, tcg_constant_i32(i)); - changed =3D true; - } - if ((crm & 4) && i !=3D s->pstate_za) { - gen_helper_set_pstate_za(cpu_env, tcg_constant_i32(i)); - changed =3D true; - } - if (changed) { + if ((old ^ new) & msk) { + /* At least one bit changes. */ + bool i =3D crm & 1; + + if ((crm & 2) && i !=3D s->pstate_sm) { + gen_helper_set_pstate_sm(cpu_env, tcg_constant_i32(i)); + } + if ((crm & 4) && i !=3D s->pstate_za) { + gen_helper_set_pstate_za(cpu_env, tcg_constant_i32(i)); + } gen_rebuild_hflags(s); } else { s->base.is_jmp =3D DISAS_NEXT; --=20 2.43.0