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[2620:137:e000::3:3]) by mx.google.com with ESMTPS id x2-20020a170902a38200b001b837f239c4si2435282pla.651.2023.09.14.18.53.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Sep 2023 18:53:55 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) client-ip=2620:137:e000::3:3; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by lipwig.vger.email (Postfix) with ESMTP id 684F882A5F0A; Thu, 14 Sep 2023 18:52:41 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at lipwig.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231659AbjIOBu5 (ORCPT + 33 others); Thu, 14 Sep 2023 21:50:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231613AbjIOBuo (ORCPT ); Thu, 14 Sep 2023 21:50:44 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 814F730F2; Thu, 14 Sep 2023 18:50:12 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8Cx2epJuANlOf8nAA--.6457S3; Fri, 15 Sep 2023 09:50:01 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Axndw9uANl+ioGAA--.11927S22; Fri, 15 Sep 2023 09:50:01 +0800 (CST) From: Tianrui Zhao To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini , Huacai Chen , WANG Xuerui , Greg Kroah-Hartman , loongarch@lists.linux.dev, Jens Axboe , Mark Brown , Alex Deucher , Oliver Upton , maobibo@loongson.cn, Xi Ruoyao , zhaotianrui@loongson.cn Subject: [PATCH v21 20/29] LoongArch: KVM: Implement handle iocsr exception Date: Fri, 15 Sep 2023 09:49:40 +0800 Message-Id: <20230915014949.1222777-21-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230915014949.1222777-1-zhaotianrui@loongson.cn> References: <20230915014949.1222777-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8Axndw9uANl+ioGAA--.11927S22 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Thu, 14 Sep 2023 18:52:41 -0700 (PDT) X-Spam-Status: No, score=-0.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777066663931070744 X-GMAIL-MSGID: 1777066663931070744 Implement kvm handle vcpu iocsr exception, setting the iocsr info into vcpu_run and return to user space to handle it. Reviewed-by: Bibo Mao Signed-off-by: Tianrui Zhao --- arch/loongarch/include/asm/inst.h | 16 ++++++ arch/loongarch/kvm/exit.c | 92 +++++++++++++++++++++++++++++++ 2 files changed, 108 insertions(+) diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h index 71e1ed4165..008a88ead6 100644 --- a/arch/loongarch/include/asm/inst.h +++ b/arch/loongarch/include/asm/inst.h @@ -65,6 +65,14 @@ enum reg2_op { revbd_op = 0x0f, revh2w_op = 0x10, revhd_op = 0x11, + iocsrrdb_op = 0x19200, + iocsrrdh_op = 0x19201, + iocsrrdw_op = 0x19202, + iocsrrdd_op = 0x19203, + iocsrwrb_op = 0x19204, + iocsrwrh_op = 0x19205, + iocsrwrw_op = 0x19206, + iocsrwrd_op = 0x19207, }; enum reg2i5_op { @@ -318,6 +326,13 @@ struct reg2bstrd_format { unsigned int opcode : 10; }; +struct reg2csr_format { + unsigned int rd : 5; + unsigned int rj : 5; + unsigned int csr : 14; + unsigned int opcode : 8; +}; + struct reg3_format { unsigned int rd : 5; unsigned int rj : 5; @@ -346,6 +361,7 @@ union loongarch_instruction { struct reg2i14_format reg2i14_format; struct reg2i16_format reg2i16_format; struct reg2bstrd_format reg2bstrd_format; + struct reg2csr_format reg2csr_format; struct reg3_format reg3_format; struct reg3sa2_format reg3sa2_format; }; diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c index f77175351b..1a83eb9afe 100644 --- a/arch/loongarch/kvm/exit.c +++ b/arch/loongarch/kvm/exit.c @@ -107,3 +107,95 @@ static int kvm_handle_csr(struct kvm_vcpu *vcpu, larch_inst inst) return EMULATE_DONE; } + +int kvm_emu_iocsr(larch_inst inst, struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + u32 rd, rj, opcode; + u32 addr; + unsigned long val; + int ret; + + /* + * Each IOCSR with different opcode + */ + rd = inst.reg2_format.rd; + rj = inst.reg2_format.rj; + opcode = inst.reg2_format.opcode; + addr = vcpu->arch.gprs[rj]; + ret = EMULATE_DO_IOCSR; + run->iocsr_io.phys_addr = addr; + run->iocsr_io.is_write = 0; + + /* LoongArch is Little endian */ + switch (opcode) { + case iocsrrdb_op: + run->iocsr_io.len = 1; + break; + case iocsrrdh_op: + run->iocsr_io.len = 2; + break; + case iocsrrdw_op: + run->iocsr_io.len = 4; + break; + case iocsrrdd_op: + run->iocsr_io.len = 8; + break; + case iocsrwrb_op: + run->iocsr_io.len = 1; + run->iocsr_io.is_write = 1; + break; + case iocsrwrh_op: + run->iocsr_io.len = 2; + run->iocsr_io.is_write = 1; + break; + case iocsrwrw_op: + run->iocsr_io.len = 4; + run->iocsr_io.is_write = 1; + break; + case iocsrwrd_op: + run->iocsr_io.len = 8; + run->iocsr_io.is_write = 1; + break; + default: + ret = EMULATE_FAIL; + break; + } + + if (ret == EMULATE_DO_IOCSR) { + if (run->iocsr_io.is_write) { + val = vcpu->arch.gprs[rd]; + memcpy(run->iocsr_io.data, &val, run->iocsr_io.len); + } + vcpu->arch.io_gpr = rd; + } + + return ret; +} + +int kvm_complete_iocsr_read(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + unsigned long *gpr = &vcpu->arch.gprs[vcpu->arch.io_gpr]; + enum emulation_result er = EMULATE_DONE; + + switch (run->iocsr_io.len) { + case 8: + *gpr = *(s64 *)run->iocsr_io.data; + break; + case 4: + *gpr = *(int *)run->iocsr_io.data; + break; + case 2: + *gpr = *(short *)run->iocsr_io.data; + break; + case 1: + *gpr = *(char *) run->iocsr_io.data; + break; + default: + kvm_err("Bad IOCSR length: %d,addr is 0x%lx", + run->iocsr_io.len, vcpu->arch.badv); + er = EMULATE_FAIL; + break; + } + + return er; +}