From 2dc10fa2f900fbb6fa5573c6c9411145b3a166f9 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Mon, 24 May 2021 18:02:27 -0700 Subject: target/arm: Add ID_AA64ZFR0 fields and isar_feature_aa64_sve2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Will be used for SVE2 isa subset enablement. Reviewed-by: Alex Bennée Signed-off-by: Richard Henderson Message-id: 20210525010358.152808-2-richard.henderson@linaro.org Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- target/arm/cpu.h | 16 ++++++++++++++++ target/arm/helper.c | 3 +-- target/arm/kvm64.c | 21 +++++++++++++++------ 3 files changed, 32 insertions(+), 8 deletions(-) diff --git a/target/arm/cpu.h b/target/arm/cpu.h index 7986a21..b7ce3b1 100644 --- a/target/arm/cpu.h +++ b/target/arm/cpu.h @@ -947,6 +947,7 @@ struct ARMCPU { uint64_t id_aa64mmfr2; uint64_t id_aa64dfr0; uint64_t id_aa64dfr1; + uint64_t id_aa64zfr0; } isar; uint64_t midr; uint32_t revidr; @@ -2034,6 +2035,16 @@ FIELD(ID_AA64DFR0, DOUBLELOCK, 36, 4) FIELD(ID_AA64DFR0, TRACEFILT, 40, 4) FIELD(ID_AA64DFR0, MTPMU, 48, 4) +FIELD(ID_AA64ZFR0, SVEVER, 0, 4) +FIELD(ID_AA64ZFR0, AES, 4, 4) +FIELD(ID_AA64ZFR0, BITPERM, 16, 4) +FIELD(ID_AA64ZFR0, BFLOAT16, 20, 4) +FIELD(ID_AA64ZFR0, SHA3, 32, 4) +FIELD(ID_AA64ZFR0, SM4, 40, 4) +FIELD(ID_AA64ZFR0, I8MM, 44, 4) +FIELD(ID_AA64ZFR0, F32MM, 52, 4) +FIELD(ID_AA64ZFR0, F64MM, 56, 4) + FIELD(ID_DFR0, COPDBG, 0, 4) FIELD(ID_DFR0, COPSDBG, 4, 4) FIELD(ID_DFR0, MMAPDBG, 8, 4) @@ -4225,6 +4236,11 @@ static inline bool isar_feature_aa64_ssbs(const ARMISARegisters *id) return FIELD_EX64(id->id_aa64pfr1, ID_AA64PFR1, SSBS) != 0; } +static inline bool isar_feature_aa64_sve2(const ARMISARegisters *id) +{ + return FIELD_EX64(id->id_aa64zfr0, ID_AA64ZFR0, SVEVER) != 0; +} + /* * Feature tests for "does this exist in either 32-bit or 64-bit?" */ diff --git a/target/arm/helper.c b/target/arm/helper.c index 59e9847..a66c1f0 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -7879,8 +7879,7 @@ void register_cp_regs_for_features(ARMCPU *cpu) .opc0 = 3, .opc1 = 0, .crn = 0, .crm = 4, .opc2 = 4, .access = PL1_R, .type = ARM_CP_CONST, .accessfn = access_aa64_tid3, - /* At present, only SVEver == 0 is defined anyway. */ - .resetvalue = 0 }, + .resetvalue = cpu->isar.id_aa64zfr0 }, { .name = "ID_AA64PFR5_EL1_RESERVED", .state = ARM_CP_STATE_AA64, .opc0 = 3, .opc1 = 0, .crn = 0, .crm = 4, .opc2 = 5, .access = PL1_R, .type = ARM_CP_CONST, diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c index dff85f6..37ceadd 100644 --- a/target/arm/kvm64.c +++ b/target/arm/kvm64.c @@ -647,17 +647,26 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf) sve_supported = ioctl(fdarray[0], KVM_CHECK_EXTENSION, KVM_CAP_ARM_SVE) > 0; - kvm_arm_destroy_scratch_host_vcpu(fdarray); - - if (err < 0) { - return false; - } - /* Add feature bits that can't appear until after VCPU init. */ if (sve_supported) { t = ahcf->isar.id_aa64pfr0; t = FIELD_DP64(t, ID_AA64PFR0, SVE, 1); ahcf->isar.id_aa64pfr0 = t; + + /* + * Before v5.1, KVM did not support SVE and did not expose + * ID_AA64ZFR0_EL1 even as RAZ. After v5.1, KVM still does + * not expose the register to "user" requests like this + * unless the host supports SVE. + */ + err |= read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64zfr0, + ARM64_SYS_REG(3, 0, 0, 4, 4)); + } + + kvm_arm_destroy_scratch_host_vcpu(fdarray); + + if (err < 0) { + return false; } /* -- cgit v1.1