From patchwork Tue Mar 28 12:31:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: zhaotianrui X-Patchwork-Id: 76053 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b0ea:0:b0:3b6:4342:cba0 with SMTP id b10csp2185023vqo; Tue, 28 Mar 2023 05:43:18 -0700 (PDT) X-Google-Smtp-Source: AKy350aSUdfPDexlZdRMrY/Xx6wvEBjNtFvdPN8gtgUJLeVmHoeIViUdZOrxoRk6gum4rTcdI6SI X-Received: by 2002:a17:903:189:b0:1a1:bede:5e34 with SMTP id z9-20020a170903018900b001a1bede5e34mr18720738plg.3.1680007398412; Tue, 28 Mar 2023 05:43:18 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1680007398; cv=none; d=google.com; s=arc-20160816; b=bkEKApVCaBMd7X2f8nlP4s7rgDB2xTmwqn9QKEK+6aTxvN4P0kCBAEE7zJa5VR4brE 8nz4NnPjDQKHiWEUPTr9vSUudqqDWDBUNQ+SNYNC7BKkzQqeOYK4xfbrBT2i1Qvfp2Fm 7otVFMPt7Cbme1aOIRRd56RVakZvZP9ACaZupr7P2zTbXIse/0Datxnpz0RhWRLUs+Dj 1cNHuOEHPYeUEUJ2tTWTX5id2Cxtocjvs+0173kRwiD4urG9NiVkKJrqDVyfAw2Znnhh fwrNPwAk9IT1qsQb0A0VVgpuFplljG+eWlNfKU1vunY8a9w8ULZK77azKTTq3HI/7JQI k85Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from; bh=VUqa/7cv0J91vF5fDz8AdKBu43KfZYGTH/sgHL6SSQ8=; b=uQGdIrSYwQez15yCePUAZZ0vWAEyDK8uHN0l6N/qE5qAWDqWNWeU5DTfYTs6hiLGqB 1UI3V3UgDFYVoaxew8eoBs7SDs4uEcuHCB19BWQh3i2Wfd3lxx2CQzuOx4x8C1YgdSUm 1Sb9n3jBOddxaqmvrKV8lB6VGYyI4dFIFASF7FD30vOD/rUVb6Gxz8HIkZ7u+0zR+/wh NKRGMvQOb+uq4Fmgz8vmDePotBhWX1QTjQoiJU9J9TymoTJPpGf8qr2XOsErGSi5P1QE BHThatfKqiOvNo69pZrR4zy5h91+bj/ODEjOSxDCep2EhaEFLDE9yT/hEm3+urvryX/E eg7w== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id v16-20020a634810000000b004ffc2ec1b51si28763977pga.271.2023.03.28.05.43.04; Tue, 28 Mar 2023 05:43:18 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232385AbjC1MhM (ORCPT + 99 others); Tue, 28 Mar 2023 08:37:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46174 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232627AbjC1MhK (ORCPT ); Tue, 28 Mar 2023 08:37:10 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 150B326B6; Tue, 28 Mar 2023 05:36:43 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8AxJ_Ad3iJkchkTAA--.29212S3; Tue, 28 Mar 2023 20:31:25 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxPL4X3iJku2cPAA--.12046S22; Tue, 28 Mar 2023 20:31:24 +0800 (CST) From: Tianrui Zhao To: Paolo Bonzini Cc: Huacai Chen , WANG Xuerui , Greg Kroah-Hartman , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Jens Axboe , Mark Brown , Alex Deucher , Oliver Upton , maobibo@loongson.cn, Xi Ruoyao , zhaotianrui@loongson.cn Subject: [PING PATCH v4 20/29] LoongArch: KVM: Implement handle csr excption Date: Tue, 28 Mar 2023 20:31:10 +0800 Message-Id: <20230328123119.3649361-21-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230328123119.3649361-1-zhaotianrui@loongson.cn> References: <20230328123119.3649361-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8CxPL4X3iJku2cPAA--.12046S22 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoW3Ar1ktry7uryUAF13XryxKrg_yoW7Xr18pF Z7Ca15Xw40qw12kas3JFs0vrZ8X3ykGr17tFy7t34SvF12yF1rXFWvgryDXF98Ja9YqFW2 qay5trn5ur4UtaUanT9S1TB71UUUUjJqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU b4AFc2x0x2IEx4CE42xK8VAvwI8IcIk0rVWrJVCq3wA2ocxC64kIII0Yj41l84x0c7CEw4 AK67xGY2AK021l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF 7I0E14v26r4UJVWxJr1l84ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I8E87Iv6x kF7I0E14v26F4UJVW0owAaw2AFwI0_JF0_Jw1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAq jxCEc2xF0cIa020Ex4CE44I27wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E74AGY7Cv6c x26rWlOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxkF7I0En4kS14v26r12 6r1DMxAIw28IcxkI7VAKI48JMxAIw28IcVCjz48v1sIEY20_WwCFx2IqxVCFs4IE7xkEbV WUJVW8JwCFI7km07C267AKxVWUAVWUtwC20s026c02F40E14v26r1j6r18MI8I3I0E7480 Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7 IYx2IY67AKxVWDJVCq3wCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJwCI42IY6xAI w20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr1j6F4UJwCI42IY6I8E87Iv6x kF7I0E14v26r4UJVWxJrUvcSsGvfC2KfnxnUUI43ZEXa7xRiTKZJUUUUU== X-Spam-Status: No, score=-0.0 required=5.0 tests=SPF_HELO_PASS,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1761615437515478379?= X-GMAIL-MSGID: =?utf-8?q?1761615437515478379?= Implement kvm handle loongarch vcpu exit caused by reading and writing csr. Using loongarch_csr structure to emulate the registers. Signed-off-by: Tianrui Zhao --- arch/loongarch/include/asm/kvm_csr.h | 55 +++++++++++++++ arch/loongarch/kvm/exit.c | 100 +++++++++++++++++++++++++++ 2 files changed, 155 insertions(+) create mode 100644 arch/loongarch/include/asm/kvm_csr.h create mode 100644 arch/loongarch/kvm/exit.c diff --git a/arch/loongarch/include/asm/kvm_csr.h b/arch/loongarch/include/asm/kvm_csr.h new file mode 100644 index 000000000..18052d0ad --- /dev/null +++ b/arch/loongarch/include/asm/kvm_csr.h @@ -0,0 +1,55 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited + */ + +#ifndef __ASM_LOONGARCH_KVM_CSR_H__ +#define __ASM_LOONGARCH_KVM_CSR_H__ +#include +#include +#include +#include +#include + +#define kvm_read_hw_gcsr(id) gcsr_read(id) +#define kvm_write_hw_gcsr(csr, id, val) gcsr_write(val, id) + +int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v); +int _kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 v); + +int _kvm_emu_iocsr(larch_inst inst, struct kvm_run *run, struct kvm_vcpu *vcpu); + +static inline void kvm_save_hw_gcsr(struct loongarch_csrs *csr, int gid) +{ + csr->csrs[gid] = gcsr_read(gid); +} + +static inline void kvm_restore_hw_gcsr(struct loongarch_csrs *csr, int gid) +{ + gcsr_write(csr->csrs[gid], gid); +} + +static inline unsigned long kvm_read_sw_gcsr(struct loongarch_csrs *csr, int gid) +{ + return csr->csrs[gid]; +} + +static inline void kvm_write_sw_gcsr(struct loongarch_csrs *csr, int gid, unsigned long val) +{ + csr->csrs[gid] = val; +} + +static inline void kvm_set_sw_gcsr(struct loongarch_csrs *csr, int gid, unsigned long val) +{ + csr->csrs[gid] |= val; +} + +static inline void kvm_change_sw_gcsr(struct loongarch_csrs *csr, int gid, unsigned long mask, + unsigned long val) +{ + unsigned long _mask = mask; + + csr->csrs[gid] &= ~_mask; + csr->csrs[gid] |= val & _mask; +} +#endif /* __ASM_LOONGARCH_KVM_CSR_H__ */ diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c new file mode 100644 index 000000000..dcb8eb815 --- /dev/null +++ b/arch/loongarch/kvm/exit.c @@ -0,0 +1,100 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define CREATE_TRACE_POINTS +#include "trace.h" + +static unsigned long _kvm_emu_read_csr(struct kvm_vcpu *vcpu, int csrid) +{ + struct loongarch_csrs *csr = vcpu->arch.csr; + unsigned long val = 0; + + if (csrid < 4096 && (get_gcsr_flag(csrid) & SW_GCSR)) + val = kvm_read_sw_gcsr(csr, csrid); + else + pr_warn_once("Unsupport csrread 0x%x with pc %lx\n", + csrid, vcpu->arch.pc); + return val; +} + +static void _kvm_emu_write_csr(struct kvm_vcpu *vcpu, int csrid, + unsigned long val) +{ + struct loongarch_csrs *csr = vcpu->arch.csr; + + if (csrid < 4096 && (get_gcsr_flag(csrid) & SW_GCSR)) + kvm_write_sw_gcsr(csr, csrid, val); + else + pr_warn_once("Unsupport csrwrite 0x%x with pc %lx\n", + csrid, vcpu->arch.pc); +} + +static void _kvm_emu_xchg_csr(struct kvm_vcpu *vcpu, int csrid, + unsigned long csr_mask, unsigned long val) +{ + struct loongarch_csrs *csr = vcpu->arch.csr; + + if (csrid < 4096 && (get_gcsr_flag(csrid) & SW_GCSR)) { + unsigned long orig; + + orig = kvm_read_sw_gcsr(csr, csrid); + orig &= ~csr_mask; + orig |= val & csr_mask; + kvm_write_sw_gcsr(csr, csrid, orig); + } else + pr_warn_once("Unsupport csrxchg 0x%x with pc %lx\n", + csrid, vcpu->arch.pc); +} + +static int _kvm_handle_csr(struct kvm_vcpu *vcpu, larch_inst inst) +{ + unsigned int rd, rj, csrid; + unsigned long csr_mask; + unsigned long val = 0; + + /* + * CSR value mask imm + * rj = 0 means csrrd + * rj = 1 means csrwr + * rj != 0,1 means csrxchg + */ + rd = inst.reg2csr_format.rd; + rj = inst.reg2csr_format.rj; + csrid = inst.reg2csr_format.csr; + + /* Process CSR ops */ + if (rj == 0) { + /* process csrrd */ + val = _kvm_emu_read_csr(vcpu, csrid); + vcpu->arch.gprs[rd] = val; + } else if (rj == 1) { + /* process csrwr */ + val = vcpu->arch.gprs[rd]; + _kvm_emu_write_csr(vcpu, csrid, val); + } else { + /* process csrxchg */ + val = vcpu->arch.gprs[rd]; + csr_mask = vcpu->arch.gprs[rj]; + _kvm_emu_xchg_csr(vcpu, csrid, csr_mask, val); + } + + return EMULATE_DONE; +}