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Wed, 16 Jun 2021 12:56:16 -0700 (PDT) Date: Wed, 16 Jun 2021 12:56:14 -0700 Message-Id: <20210616195614.11785-1-pcc@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.32.0.272.g935e593368-goog Subject: [PATCH v2] target/arm: Implement MTE3 From: Peter Collingbourne To: Richard Henderson Cc: Peter Collingbourne , Vincenzo Frascino , Evgenii Stepanov , qemu-devel@nongnu.org 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::b49; envelope-from=3YFfKYAMKCkUwjjnvvnsl.jvtxlt1-kl2lsuvunu1.vyn@flex--pcc.bounces.google.com; helo=mail-yb1-xb49.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, 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, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 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" X-ZohoMail-DKIM: pass (identity @google.com) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" MTE3 introduces an asymmetric tag checking mode, in which loads are checked synchronously and stores are checked asynchronously. Add support for it. Signed-off-by: Peter Collingbourne Reviewed-by: Richard Henderson --- v2: - remove unused argument target/arm/cpu64.c | 2 +- target/arm/mte_helper.c | 82 +++++++++++++++++++++++++---------------- 2 files changed, 52 insertions(+), 32 deletions(-) diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c index 1c23187d1a..c7a1626bec 100644 --- a/target/arm/cpu64.c +++ b/target/arm/cpu64.c @@ -683,7 +683,7 @@ static void aarch64_max_initfn(Object *obj) * during realize if the board provides no tag memory, much like * we do for EL2 with the virtualization=3Don property. */ - t =3D FIELD_DP64(t, ID_AA64PFR1, MTE, 2); + t =3D FIELD_DP64(t, ID_AA64PFR1, MTE, 3); cpu->isar.id_aa64pfr1 =3D t; =20 t =3D cpu->isar.id_aa64mmfr0; diff --git a/target/arm/mte_helper.c b/target/arm/mte_helper.c index 9e615cc513..724175210b 100644 --- a/target/arm/mte_helper.c +++ b/target/arm/mte_helper.c @@ -538,13 +538,50 @@ void HELPER(stzgm_tags)(CPUARMState *env, uint64_t pt= r, uint64_t val) } } =20 +static void mte_sync_check_fail(CPUARMState *env, uint32_t desc, + uint64_t dirty_ptr, uintptr_t ra) +{ + int is_write, syn; + + env->exception.vaddress =3D dirty_ptr; + + is_write =3D FIELD_EX32(desc, MTEDESC, WRITE); + syn =3D syn_data_abort_no_iss(arm_current_el(env) !=3D 0, 0, 0, 0, 0, = is_write, + 0x11); + raise_exception_ra(env, EXCP_DATA_ABORT, syn, exception_target_el(env)= , ra); + g_assert_not_reached(); +} + +static void mte_async_check_fail(CPUARMState *env, uint64_t dirty_ptr, + uintptr_t ra, ARMMMUIdx arm_mmu_idx, int = el) +{ + int select; + + if (regime_has_2_ranges(arm_mmu_idx)) { + select =3D extract64(dirty_ptr, 55, 1); + } else { + select =3D 0; + } + env->cp15.tfsr_el[el] |=3D 1 << select; +#ifdef CONFIG_USER_ONLY + /* + * Stand in for a timer irq, setting _TIF_MTE_ASYNC_FAULT, + * which then sends a SIGSEGV when the thread is next scheduled. + * This cpu will return to the main loop at the end of the TB, + * which is rather sooner than "normal". But the alternative + * is waiting until the next syscall. + */ + qemu_cpu_kick(env_cpu(env)); +#endif +} + /* Record a tag check failure. */ static void mte_check_fail(CPUARMState *env, uint32_t desc, uint64_t dirty_ptr, uintptr_t ra) { int mmu_idx =3D FIELD_EX32(desc, MTEDESC, MIDX); ARMMMUIdx arm_mmu_idx =3D core_to_aa64_mmu_idx(mmu_idx); - int el, reg_el, tcf, select, is_write, syn; + int el, reg_el, tcf; uint64_t sctlr; =20 reg_el =3D regime_el(env, arm_mmu_idx); @@ -564,14 +601,8 @@ static void mte_check_fail(CPUARMState *env, uint32_t = desc, switch (tcf) { case 1: /* Tag check fail causes a synchronous exception. */ - env->exception.vaddress =3D dirty_ptr; - - is_write =3D FIELD_EX32(desc, MTEDESC, WRITE); - syn =3D syn_data_abort_no_iss(arm_current_el(env) !=3D 0, 0, 0, 0,= 0, - is_write, 0x11); - raise_exception_ra(env, EXCP_DATA_ABORT, syn, - exception_target_el(env), ra); - /* noreturn, but fall through to the assert anyway */ + mte_sync_check_fail(env, desc, dirty_ptr, ra); + break; =20 case 0: /* @@ -583,30 +614,19 @@ static void mte_check_fail(CPUARMState *env, uint32_t= desc, =20 case 2: /* Tag check fail causes asynchronous flag set. */ - if (regime_has_2_ranges(arm_mmu_idx)) { - select =3D extract64(dirty_ptr, 55, 1); - } else { - select =3D 0; - } - env->cp15.tfsr_el[el] |=3D 1 << select; -#ifdef CONFIG_USER_ONLY - /* - * Stand in for a timer irq, setting _TIF_MTE_ASYNC_FAULT, - * which then sends a SIGSEGV when the thread is next scheduled. - * This cpu will return to the main loop at the end of the TB, - * which is rather sooner than "normal". But the alternative - * is waiting until the next syscall. - */ - qemu_cpu_kick(env_cpu(env)); -#endif + mte_async_check_fail(env, dirty_ptr, ra, arm_mmu_idx, el); break; =20 - default: - /* Case 3: Reserved. */ - qemu_log_mask(LOG_GUEST_ERROR, - "Tag check failure with SCTLR_EL%d.TCF%s " - "set to reserved value %d\n", - reg_el, el ? "" : "0", tcf); + case 3: + /* + * Tag check fail causes asynchronous flag set for stores, or + * a synchronous exception for loads. + */ + if (FIELD_EX32(desc, MTEDESC, WRITE)) { + mte_async_check_fail(env, dirty_ptr, ra, arm_mmu_idx, el); + } else { + mte_sync_check_fail(env, desc, dirty_ptr, ra); + } break; } } --=20 2.32.0.272.g935e593368-goog