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Wed, 10 Dec 2025 06:50:14 -0800 (PST) From: Jim MacArthur Date: Wed, 10 Dec 2025 14:50:14 +0000 Subject: [PATCH v6 4/4] tests: Add test for ASID2 and write/read of feature bits MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251210-jmac-asid2-v6-4-d3b3acab98c7@linaro.org> References: <20251210-jmac-asid2-v6-0-d3b3acab98c7@linaro.org> In-Reply-To: <20251210-jmac-asid2-v6-0-d3b3acab98c7@linaro.org> To: qemu-devel@nongnu.org Cc: Jim MacArthur , =?utf-8?q?Alex_Benn=C3=A9e?= X-Mailer: b4 0.13.0 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=2a00:1450:4864:20::32a; envelope-from=jim.macarthur@linaro.org; helo=mail-wm1-x32a.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: 1765378309847158500 Test for presence of ASID2; if it is, check FNG1, FNG0, and A2 are writable, and read value shows the update. If not present, check these read as RES0. Reviewed-by: Alex Benn=C3=A9e Signed-off-by: Jim MacArthur --- tests/tcg/aarch64/system/asid2.c | 76 ++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 76 insertions(+) diff --git a/tests/tcg/aarch64/system/asid2.c b/tests/tcg/aarch64/system/as= id2.c new file mode 100644 index 0000000000..7d5466af34 --- /dev/null +++ b/tests/tcg/aarch64/system/asid2.c @@ -0,0 +1,76 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * + * ASID2 Feature presence and enabled TCR2_EL1 bits test + * + * Copyright (c) 2025 Linaro Ltd + * + */ + +#include +#include + +#define ID_AA64MMFR3_EL1 "S3_0_C0_C7_3" +#define ID_AA64MMFR4_EL1 "S3_0_C0_C7_4" +#define TCR2_EL1 "S3_0_C2_C0_3" + +int main() +{ + /* + * Test for presence of ASID2 and three feature bits enabled by it: + * https://developer.arm.com/documentation/109697/2025_09/Feature-desc= riptions/The-Armv9-5-architecture-extension + * Bits added are FNG1, FNG0, and A2. These should be RES0 if A2 is + * not enabled and read as the written value if A2 is enabled. + */ + + uint64_t out; + uint64_t idreg3; + uint64_t idreg4; + int tcr2_present; + int asid2_present; + + /* Mask is FNG1, FNG0, and A2 */ + const uint64_t feature_mask =3D (1ULL << 18 | 1ULL << 17 | 1ULL << 16); + const uint64_t in =3D feature_mask; + + asm("mrs %[idreg3], " ID_AA64MMFR3_EL1 "\n\t" + : [idreg3] "=3Dr" (idreg3)); + + tcr2_present =3D ((idreg3 & 0xF) !=3D 0); + + if (!tcr2_present) { + ml_printf("TCR2 is not present, cannot perform test"); + return 0; + } + + asm("mrs %[idreg4], " ID_AA64MMFR4_EL1 "\n\t" + : [idreg4] "=3Dr" (idreg4)); + + asid2_present =3D ((idreg4 & 0xF00) !=3D 0); + + asm("msr " TCR2_EL1 ", %[x0]\n\t" + "mrs %[x1], " TCR2_EL1 "\n\t" + : [x1] "=3Dr" (out) + : [x0] "r" (in)); + + if (asid2_present) { + if ((out & feature_mask) =3D=3D in) { + ml_printf("OK\n"); + return 0; + } else { + ml_printf("FAIL: ASID2 present, but read value %lx !=3D " + "written value %lx\n", + out & feature_mask, in); + return 1; + } + } else { + if (out =3D=3D 0) { + ml_printf("TCR2_EL1 reads as RES0 as expected\n"); + return 0; + } else { + ml_printf("FAIL: ASID2, missing but read value %lx !=3D 0\n", + out & feature_mask, in); + return 1; + } + } +} --=20 2.43.0