From patchwork Mon Nov 2 05:40:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peng Liang X-Patchwork-Id: 11873001 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5F3746A2 for ; Mon, 2 Nov 2020 05:53:58 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 16B562227F for ; Mon, 2 Nov 2020 05:53:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 16B562227F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:36928 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kZSmz-0006wE-4I for patchwork-qemu-devel@patchwork.kernel.org; Mon, 02 Nov 2020 00:53:57 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51240) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kZSdQ-0002We-3h; Mon, 02 Nov 2020 00:44:06 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:2317) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kZSdM-0001NY-0z; Mon, 02 Nov 2020 00:44:03 -0500 Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4CPhfy2TW4zkcJL; Mon, 2 Nov 2020 13:43:54 +0800 (CST) Received: from localhost.localdomain (10.175.124.27) by DGGEMS409-HUB.china.huawei.com (10.3.19.209) with Microsoft SMTP Server id 14.3.487.0; Mon, 2 Nov 2020 13:43:48 +0800 From: Peng Liang To: , Subject: [RFC v3 09/10] target/arm: introduce CPU feature dependency mechanism Date: Mon, 2 Nov 2020 13:40:54 +0800 Message-ID: <20201102054055.686143-10-liangpeng10@huawei.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201102054055.686143-1-liangpeng10@huawei.com> References: <20201102054055.686143-1-liangpeng10@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.124.27] X-CFilter-Loop: Reflected Received-SPF: pass client-ip=45.249.212.190; envelope-from=liangpeng10@huawei.com; helo=szxga04-in.huawei.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/02 00:43:42 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, drjones@redhat.com, zhang.zhanghailiang@huawei.com, mst@redhat.com, cohuck@redhat.com, xiexiangyou@huawei.com, Peng Liang , pbonzini@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Some CPU features are dependent on other CPU features. For example, ID_AA64PFR0_EL1.FP field and ID_AA64PFR0_EL1.AdvSIMD must have the same value, which means FP and ADVSIMD are dependent on each other, FPHP and ADVSIMDHP are dependent on each other. This commit introduces a mechanism for CPU feature dependency in AArch64. We build a directed graph from the CPU feature dependency relationship, each edge from->to means the `to` CPU feature is dependent on the `from` CPU feature. And we will automatically enable/disable CPU feature according to the directed graph. For example, a and b CPU features are in relationship a->b, which means b is dependent on a. If b is enabled by user, then a is enabled automatically. And if a is disabled by user, then b is disabled automatically. Signed-off-by: zhanghailiang Signed-off-by: Peng Liang --- target/arm/cpu.c | 134 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 134 insertions(+) diff --git a/target/arm/cpu.c b/target/arm/cpu.c index 8c84a16d92a8..9d5916719a24 100644 --- a/target/arm/cpu.c +++ b/target/arm/cpu.c @@ -1266,6 +1266,107 @@ static struct CPUFeatureInfo cpu_features[] = { }, }; +typedef struct CPUFeatureDep { + CPUFeatureInfo from, to; +} CPUFeatureDep; + +static const CPUFeatureDep feature_dependencies[] = { + { + .from = FIELD_INFO("fp", ID_AA64PFR0, FP, true, 0, 0xf, false), + .to = FIELD_INFO("asimd", ID_AA64PFR0, ADVSIMD, true, 0, 0xf, false), + }, + { + .from = FIELD_INFO("asimd", ID_AA64PFR0, ADVSIMD, true, 0, 0xf, false), + .to = FIELD_INFO("fp", ID_AA64PFR0, FP, true, 0, 0xf, false), + }, + { + .from = { + .reg = ID_AA64PFR0, .length = R_ID_AA64PFR0_FP_LENGTH, + .shift = R_ID_AA64PFR0_FP_SHIFT, .sign = true, .min_value = 1, + .ni_value = 0, .name = "fphp", .is_32bit = false, + }, + .to = { + .reg = ID_AA64PFR0, .length = R_ID_AA64PFR0_ADVSIMD_LENGTH, + .shift = R_ID_AA64PFR0_ADVSIMD_SHIFT, .sign = true, .min_value = 1, + .ni_value = 0, .name = "asimdhp", .is_32bit = false, + }, + }, + { + .from = { + .reg = ID_AA64PFR0, .length = R_ID_AA64PFR0_ADVSIMD_LENGTH, + .shift = R_ID_AA64PFR0_ADVSIMD_SHIFT, .sign = true, .min_value = 1, + .ni_value = 0, .name = "asimdhp", .is_32bit = false, + }, + .to = { + .reg = ID_AA64PFR0, .length = R_ID_AA64PFR0_FP_LENGTH, + .shift = R_ID_AA64PFR0_FP_SHIFT, .sign = true, .min_value = 1, + .ni_value = 0, .name = "fphp", .is_32bit = false, + }, + }, + { + + .from = FIELD_INFO("aes", ID_AA64ISAR0, AES, false, 1, 0, false), + .to = { + .reg = ID_AA64ISAR0, .length = R_ID_AA64ISAR0_AES_LENGTH, + .shift = R_ID_AA64ISAR0_AES_SHIFT, .sign = false, .min_value = 2, + .ni_value = 1, .name = "pmull", .is_32bit = false, + }, + }, + { + + .from = FIELD_INFO("sha2", ID_AA64ISAR0, SHA2, false, 1, 0, false), + .to = { + .reg = ID_AA64ISAR0, .length = R_ID_AA64ISAR0_SHA2_LENGTH, + .shift = R_ID_AA64ISAR0_SHA2_SHIFT, .sign = false, .min_value = 2, + .ni_value = 1, .name = "sha512", .is_32bit = false, + }, + }, + { + .from = FIELD_INFO("lrcpc", ID_AA64ISAR1, LRCPC, false, 1, 0, false), + .to = { + .reg = ID_AA64ISAR1, .length = R_ID_AA64ISAR1_LRCPC_LENGTH, + .shift = R_ID_AA64ISAR1_LRCPC_SHIFT, .sign = false, .min_value = 2, + .ni_value = 1, .name = "ilrcpc", .is_32bit = false, + }, + }, + { + .from = FIELD_INFO("sm3", ID_AA64ISAR0, SM3, false, 1, 0, false), + .to = FIELD_INFO("sm4", ID_AA64ISAR0, SM4, false, 1, 0, false), + }, + { + .from = FIELD_INFO("sm4", ID_AA64ISAR0, SM4, false, 1, 0, false), + .to = FIELD_INFO("sm3", ID_AA64ISAR0, SM3, false, 1, 0, false), + }, + { + .from = FIELD_INFO("sha1", ID_AA64ISAR0, SHA1, false, 1, 0, false), + .to = FIELD_INFO("sha2", ID_AA64ISAR0, SHA2, false, 1, 0, false), + }, + { + .from = FIELD_INFO("sha2", ID_AA64ISAR0, SHA2, false, 1, 0, false), + .to = FIELD_INFO("sha1", ID_AA64ISAR0, SHA1, false, 1, 0, false), + }, + { + .from = FIELD_INFO("sha1", ID_AA64ISAR0, SHA1, false, 1, 0, false), + .to = FIELD_INFO("sha3", ID_AA64ISAR0, SHA3, false, 1, 0, false), + }, + { + .from = FIELD_INFO("sha3", ID_AA64ISAR0, SHA3, false, 1, 0, false), + .to = { + .reg = ID_AA64ISAR0, .length = R_ID_AA64ISAR0_SHA2_LENGTH, + .shift = R_ID_AA64ISAR0_SHA2_SHIFT, .sign = false, .min_value = 2, + .ni_value = 1, .name = "sha512", .is_32bit = false, + }, + }, + { + .from = { + .reg = ID_AA64ISAR0, .length = R_ID_AA64ISAR0_SHA2_LENGTH, + .shift = R_ID_AA64ISAR0_SHA2_SHIFT, .sign = false, .min_value = 2, + .ni_value = 1, .name = "sha512", .is_32bit = false, + }, + .to = FIELD_INFO("sha3", ID_AA64ISAR0, SHA3, false, 1, 0, false), + }, +}; + static void arm_cpu_get_feature_prop(Object *obj, Visitor *v, const char *name, void *opaque, Error **errp) { @@ -1500,6 +1601,8 @@ static void arm_cpu_finalizefn(Object *obj) void arm_cpu_finalize_features(ARMCPU *cpu, Error **errp) { + int i; + ARMISARegisters *isar = &cpu->isar; Error *local_err = NULL; if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) { @@ -1517,6 +1620,37 @@ void arm_cpu_finalize_features(ARMCPU *cpu, Error **errp) return; } } + + if (!kvm_enabled() || !kvm_arm_cpu_feature_supported()) { + return; + } + + for (i = 0; i < ARRAY_SIZE(feature_dependencies); ++i) { + const CPUFeatureDep *d = &feature_dependencies[i]; + bool from_explicit = !!(isar->user_mask[d->from.reg] & + MAKE_64BIT_MASK(d->from.shift, d->from.length)); + bool to_explicit = !!(isar->user_mask[d->to.reg] & + MAKE_64BIT_MASK(d->to.shift, d->to.length)); + bool from_enabled = object_property_get_bool(OBJECT(cpu), d->from.name, + &error_abort); + bool to_enabled = object_property_get_bool(OBJECT(cpu), d->to.name, + &error_abort); + + if (!from_enabled && to_enabled) { + if (from_explicit && to_explicit) { + error_setg(errp, "The CPU feature '%s' dependes on CPU feature " + "'%s' that is disabled explicitly", + d->to.name, d->from.name); + return; + } else if (from_explicit) { + isar->regs[d->to.reg] = deposit64(isar->regs[d->to.reg], + d->to.shift, d->to.length, d->to.ni_value); + } else if (to_explicit) { + isar->regs[d->from.reg] = deposit64(isar->regs[d->from.reg], + d->from.shift, d->from.length, d->from.min_value); + } + } + } } static void arm_cpu_realizefn(DeviceState *dev, Error **errp)