From patchwork Wed Sep 4 06:18:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bibo Mao X-Patchwork-Id: 13789798 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id EACF7CD37AE for ; Wed, 4 Sep 2024 06:20:14 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sljMJ-00036J-Fv; Wed, 04 Sep 2024 02:19:15 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sljMH-00031i-QJ for qemu-devel@nongnu.org; Wed, 04 Sep 2024 02:19:13 -0400 Received: from mail.loongson.cn ([114.242.206.163]) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sljME-0008EV-6I for qemu-devel@nongnu.org; Wed, 04 Sep 2024 02:19:13 -0400 Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8CxbZvU+9dmKQEqAA--.55395S3; Wed, 04 Sep 2024 14:19:00 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowMAxndzT+9dmTOgDAA--.19522S3; Wed, 04 Sep 2024 14:19:00 +0800 (CST) From: Bibo Mao To: Song Gao Cc: Huacai Chen , qemu-devel@nongnu.org Subject: [PATCH v4 1/2] target/loongarch: Add loongson binary translation feature Date: Wed, 4 Sep 2024 14:18:58 +0800 Message-Id: <20240904061859.86615-2-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240904061859.86615-1-maobibo@loongson.cn> References: <20240904061859.86615-1-maobibo@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: qMiowMAxndzT+9dmTOgDAA--.19522S3 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Received-SPF: pass client-ip=114.242.206.163; envelope-from=maobibo@loongson.cn; helo=mail.loongson.cn X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Loongson Binary Translation (LBT) is used to accelerate binary translation, which contains 4 scratch registers (scr0 to scr3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). Now LBT feature is added in kvm mode, not supported in TCG mode since it is not emulated. Feature variable lbt is added with OnOffAuto type, If lbt feature is not supported with KVM host, it reports error if there is lbt=on command line. If there is no any command line about lbt parameter, it checks whether KVM host supports lbt feature and set the corresponding value in cpucfg. Signed-off-by: Bibo Mao Reviewed-by: Song Gao --- target/loongarch/cpu.c | 24 +++++++++++ target/loongarch/cpu.h | 6 +++ target/loongarch/kvm/kvm.c | 57 ++++++++++++++++++++++++++- target/loongarch/loongarch-qmp-cmds.c | 2 +- 4 files changed, 87 insertions(+), 2 deletions(-) diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c index 5e85b9dbef..42a575e5e3 100644 --- a/target/loongarch/cpu.c +++ b/target/loongarch/cpu.c @@ -650,12 +650,36 @@ static void loongarch_set_lasx(Object *obj, bool value, Error **errp) } } +static bool loongarch_get_lbt(Object *obj, Error **errp) +{ + return LOONGARCH_CPU(obj)->lbt != ON_OFF_AUTO_OFF; +} + +static void loongarch_set_lbt(Object *obj, bool value, Error **errp) +{ + LoongArchCPU *cpu = LOONGARCH_CPU(obj); + + cpu->lbt = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF; +} + void loongarch_cpu_post_init(Object *obj) { + LoongArchCPU *cpu = LOONGARCH_CPU(obj); + object_property_add_bool(obj, "lsx", loongarch_get_lsx, loongarch_set_lsx); object_property_add_bool(obj, "lasx", loongarch_get_lasx, loongarch_set_lasx); + /* lbt is enabled only in kvm mode, not supported in tcg mode */ + if (kvm_enabled()) { + cpu->lbt = ON_OFF_AUTO_AUTO; + object_property_add_bool(obj, "lbt", loongarch_get_lbt, + loongarch_set_lbt); + object_property_set_description(obj, "lbt", + "Set off to disable Binary Tranlation."); + } else { + cpu->lbt = ON_OFF_AUTO_OFF; + } } static void loongarch_cpu_init(Object *obj) diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h index 6c41fafb70..2b3f2758f6 100644 --- a/target/loongarch/cpu.h +++ b/target/loongarch/cpu.h @@ -153,6 +153,7 @@ FIELD(CPUCFG2, LLFTP_VER, 15, 3) FIELD(CPUCFG2, LBT_X86, 18, 1) FIELD(CPUCFG2, LBT_ARM, 19, 1) FIELD(CPUCFG2, LBT_MIPS, 20, 1) +FIELD(CPUCFG2, LBT_ALL, 18, 3) FIELD(CPUCFG2, LSPW, 21, 1) FIELD(CPUCFG2, LAM, 22, 1) @@ -281,6 +282,10 @@ struct LoongArchTLB { typedef struct LoongArchTLB LoongArchTLB; #endif +enum loongarch_features { + LOONGARCH_FEATURE_LBT, /* loongson binary translation extension */ +}; + typedef struct CPUArchState { uint64_t gpr[32]; uint64_t pc; @@ -381,6 +386,7 @@ struct ArchCPU { CPULoongArchState env; QEMUTimer timer; uint32_t phy_id; + OnOffAuto lbt; /* 'compatible' string for this CPU for Linux device trees */ const char *dtb_compatible; diff --git a/target/loongarch/kvm/kvm.c b/target/loongarch/kvm/kvm.c index e1be6a6959..ca56694a81 100644 --- a/target/loongarch/kvm/kvm.c +++ b/target/loongarch/kvm/kvm.c @@ -9,6 +9,7 @@ #include #include +#include "qapi/error.h" #include "qemu/timer.h" #include "qemu/error-report.h" #include "qemu/main-loop.h" @@ -663,17 +664,71 @@ static void kvm_loongarch_vm_stage_change(void *opaque, bool running, } } +static bool kvm_feature_supported(CPUState *cs, enum loongarch_features feature) +{ + int ret; + struct kvm_device_attr attr; + + switch (feature) { + case LOONGARCH_FEATURE_LBT: + /* + * Return all if all the LBT features are supported such as: + * KVM_LOONGARCH_VM_FEAT_X86BT + * KVM_LOONGARCH_VM_FEAT_ARMBT + * KVM_LOONGARCH_VM_FEAT_MIPSBT + */ + attr.group = KVM_LOONGARCH_VM_FEAT_CTRL; + attr.attr = KVM_LOONGARCH_VM_FEAT_X86BT; + ret = kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr); + attr.attr = KVM_LOONGARCH_VM_FEAT_ARMBT; + ret |= kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr); + attr.attr = KVM_LOONGARCH_VM_FEAT_MIPSBT; + ret |= kvm_vm_ioctl(kvm_state, KVM_HAS_DEVICE_ATTR, &attr); + return (ret == 0); + default: + return false; + } +} + +static int kvm_cpu_check_lbt(CPUState *cs, Error **errp) +{ + CPULoongArchState *env = cpu_env(cs); + LoongArchCPU *cpu = LOONGARCH_CPU(cs); + bool kvm_supported; + + kvm_supported = kvm_feature_supported(cs, LOONGARCH_FEATURE_LBT); + if (cpu->lbt == ON_OFF_AUTO_ON) { + if (kvm_supported) { + env->cpucfg[2] = FIELD_DP32(env->cpucfg[2], CPUCFG2, LBT_ALL, 7); + } else { + error_setg(errp, "'lbt' feature not supported by KVM on this host"); + return -ENOTSUP; + } + } else if ((cpu->lbt == ON_OFF_AUTO_AUTO) && kvm_supported) { + env->cpucfg[2] = FIELD_DP32(env->cpucfg[2], CPUCFG2, LBT_ALL, 7); + } + + return 0; +} + int kvm_arch_init_vcpu(CPUState *cs) { uint64_t val; + int ret; + Error *local_err = NULL; + ret = 0; qemu_add_vm_change_state_handler(kvm_loongarch_vm_stage_change, cs); if (!kvm_get_one_reg(cs, KVM_REG_LOONGARCH_DEBUG_INST, &val)) { brk_insn = val; } - return 0; + ret = kvm_cpu_check_lbt(cs, &local_err); + if (ret < 0) { + error_report_err(local_err); + } + return ret; } int kvm_arch_destroy_vcpu(CPUState *cs) diff --git a/target/loongarch/loongarch-qmp-cmds.c b/target/loongarch/loongarch-qmp-cmds.c index 8721a5eb13..c6f6e1ef85 100644 --- a/target/loongarch/loongarch-qmp-cmds.c +++ b/target/loongarch/loongarch-qmp-cmds.c @@ -40,7 +40,7 @@ CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp) } static const char *cpu_model_advertised_features[] = { - "lsx", "lasx", NULL + "lsx", "lasx", "lbt", NULL }; CpuModelExpansionInfo *qmp_query_cpu_model_expansion(CpuModelExpansionType type,