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[2620:137:e000::1:20]) by mx.google.com with ESMTP id q7-20020a635c07000000b0051b54dccffbsi10494373pgb.859.2023.04.17.03.20.07; Mon, 17 Apr 2023 03:20:21 -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 S230448AbjDQKC1 (ORCPT + 99 others); Mon, 17 Apr 2023 06:02:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230003AbjDQKB0 (ORCPT ); Mon, 17 Apr 2023 06:01:26 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 37A0210C6; Mon, 17 Apr 2023 03:00:46 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8DxXNqeGD1kzOYdAA--.34995S3; Mon, 17 Apr 2023 17:59:58 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Bx57yWGD1kua0qAA--.48254S26; Mon, 17 Apr 2023 17:59:57 +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: [PATCH v7 24/30] LoongArch: KVM: Implement handle mmio exception Date: Mon, 17 Apr 2023 17:59:44 +0800 Message-Id: <20230417095950.875228-25-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230417095950.875228-1-zhaotianrui@loongson.cn> References: <20230417095950.875228-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8Bx57yWGD1kua0qAA--.48254S26 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoW3JFWkGrW3Gw1kAF13Wr1xXwb_yoW3GF1fpr WUC34jvrZaqryYy3srKrs5Xr1a9F48GrsrJrZ7t39Fgr17tFy5Ar4v9rW2vFW3CrWF9a1x Z3Z3JF47uF1UAa7anT9S1TB71UUUU8DqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU bcxFc2x0x2IEx4CE42xK8VAvwI8IcIk0rVWrJVCq3wA2ocxC64kIII0Yj41l84x0c7CEw4 AK67xGY2AK021l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF 7I0E14v26F4UJVW0owA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x 0267AKxVW0oVCq3wAaw2AFwI0_GFv_Wryle2I262IYc4CY6c8Ij28IcVAaY2xG8wAqjxCE c2xF0cIa020Ex4CE44I27wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E74AGY7Cv6cx26r WlOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxkF7I0En4kS14v26r4a6rW5 MxAIw28IcxkI7VAKI48JMxAIw28IcVCjz48v1sIEY20_WwCFx2IqxVCFs4IE7xkEbVWUJV W8JwCFI7km07C267AKxVW8ZVWrXwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE 14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2 IY67AKxVWDJVCq3wCI42IY6xIIjxv20xvEc7CjxVAFwI0_Cr1j6rxdMIIF0xvE42xK8VAv wI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWxJr0_GcWlIxAIcVC2z280aVCY1x0267 AKxVWxJr0_GcJvcSsGvfC2KfnxnUUI43ZEXa7IU8AcTPUUUUU== X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_PASS, SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham 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?1763418384055261544?= X-GMAIL-MSGID: =?utf-8?q?1763418384055261544?= Implement handle mmio exception, setting the mmio info into vcpu_run and return to user space to handle it. Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/exit.c | 308 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 308 insertions(+) diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c index 26283a9d3c6d..1237ceb06d0c 100644 --- a/arch/loongarch/kvm/exit.c +++ b/arch/loongarch/kvm/exit.c @@ -209,6 +209,265 @@ int _kvm_emu_idle(struct kvm_vcpu *vcpu) return EMULATE_DONE; } +int _kvm_emu_mmio_write(struct kvm_vcpu *vcpu, larch_inst inst) +{ + struct kvm_run *run = vcpu->run; + unsigned int rd, op8, opcode; + unsigned long rd_val = 0; + void *data = run->mmio.data; + unsigned long curr_pc; + int ret; + + /* + * Update PC and hold onto current PC in case there is + * an error and we want to rollback the PC + */ + curr_pc = vcpu->arch.pc; + update_pc(&vcpu->arch); + + op8 = (inst.word >> 24) & 0xff; + run->mmio.phys_addr = vcpu->arch.badv; + ret = EMULATE_DO_MMIO; + if (op8 < 0x28) { + /* stptrw/d process */ + rd = inst.reg2i14_format.rd; + opcode = inst.reg2i14_format.opcode; + + switch (opcode) { + case stptrd_op: + run->mmio.len = 8; + *(unsigned long *)data = vcpu->arch.gprs[rd]; + break; + case stptrw_op: + run->mmio.len = 4; + *(unsigned int *)data = vcpu->arch.gprs[rd]; + break; + default: + ret = EMULATE_FAIL; + break; + } + } else if (op8 < 0x30) { + /* st.b/h/w/d process */ + rd = inst.reg2i12_format.rd; + opcode = inst.reg2i12_format.opcode; + rd_val = vcpu->arch.gprs[rd]; + + switch (opcode) { + case std_op: + run->mmio.len = 8; + *(unsigned long *)data = rd_val; + break; + case stw_op: + run->mmio.len = 4; + *(unsigned int *)data = rd_val; + break; + case sth_op: + run->mmio.len = 2; + *(unsigned short *)data = rd_val; + break; + case stb_op: + run->mmio.len = 1; + *(unsigned char *)data = rd_val; + break; + default: + ret = EMULATE_FAIL; + break; + } + } else if (op8 == 0x38) { + /* stxb/h/w/d process */ + rd = inst.reg3_format.rd; + opcode = inst.reg3_format.opcode; + + switch (opcode) { + case stxb_op: + run->mmio.len = 1; + *(unsigned char *)data = vcpu->arch.gprs[rd]; + break; + case stxh_op: + run->mmio.len = 2; + *(unsigned short *)data = vcpu->arch.gprs[rd]; + break; + case stxw_op: + run->mmio.len = 4; + *(unsigned int *)data = vcpu->arch.gprs[rd]; + break; + case stxd_op: + run->mmio.len = 8; + *(unsigned long *)data = vcpu->arch.gprs[rd]; + break; + default: + ret = EMULATE_FAIL; + break; + } + } else + ret = EMULATE_FAIL; + + if (ret == EMULATE_DO_MMIO) { + run->mmio.is_write = 1; + vcpu->mmio_needed = 1; + vcpu->mmio_is_write = 1; + } else { + vcpu->arch.pc = curr_pc; + kvm_err("Write not supporded inst=0x%08x @%lx BadVaddr:%#lx\n", + inst.word, vcpu->arch.pc, vcpu->arch.badv); + kvm_arch_vcpu_dump_regs(vcpu); + /* Rollback PC if emulation was unsuccessful */ + } + + return ret; +} + +int _kvm_emu_mmio_read(struct kvm_vcpu *vcpu, larch_inst inst) +{ + unsigned int op8, opcode, rd; + struct kvm_run *run = vcpu->run; + int ret; + + run->mmio.phys_addr = vcpu->arch.badv; + vcpu->mmio_needed = 2; /* signed */ + op8 = (inst.word >> 24) & 0xff; + ret = EMULATE_DO_MMIO; + + if (op8 < 0x28) { + /* ldptr.w/d process */ + rd = inst.reg2i14_format.rd; + opcode = inst.reg2i14_format.opcode; + + switch (opcode) { + case ldptrd_op: + run->mmio.len = 8; + break; + case ldptrw_op: + run->mmio.len = 4; + break; + default: + break; + } + } else if (op8 < 0x2f) { + /* ld.b/h/w/d, ld.bu/hu/wu process */ + rd = inst.reg2i12_format.rd; + opcode = inst.reg2i12_format.opcode; + + switch (opcode) { + case ldd_op: + run->mmio.len = 8; + break; + case ldwu_op: + vcpu->mmio_needed = 1; /* unsigned */ + run->mmio.len = 4; + break; + case ldw_op: + run->mmio.len = 4; + break; + case ldhu_op: + vcpu->mmio_needed = 1; /* unsigned */ + run->mmio.len = 2; + break; + case ldh_op: + run->mmio.len = 2; + break; + case ldbu_op: + vcpu->mmio_needed = 1; /* unsigned */ + run->mmio.len = 1; + break; + case ldb_op: + run->mmio.len = 1; + break; + default: + ret = EMULATE_FAIL; + break; + } + } else if (op8 == 0x38) { + /* ldxb/h/w/d, ldxb/h/wu, ldgtb/h/w/d, ldleb/h/w/d process */ + rd = inst.reg3_format.rd; + opcode = inst.reg3_format.opcode; + + switch (opcode) { + case ldxb_op: + run->mmio.len = 1; + break; + case ldxbu_op: + run->mmio.len = 1; + vcpu->mmio_needed = 1; /* unsigned */ + break; + case ldxh_op: + run->mmio.len = 2; + break; + case ldxhu_op: + run->mmio.len = 2; + vcpu->mmio_needed = 1; /* unsigned */ + break; + case ldxw_op: + run->mmio.len = 4; + break; + case ldxwu_op: + run->mmio.len = 4; + vcpu->mmio_needed = 1; /* unsigned */ + break; + case ldxd_op: + run->mmio.len = 8; + break; + default: + ret = EMULATE_FAIL; + break; + } + } else + ret = EMULATE_FAIL; + + if (ret == EMULATE_DO_MMIO) { + /* Set for _kvm_complete_mmio_read use */ + vcpu->arch.io_gpr = rd; + run->mmio.is_write = 0; + vcpu->mmio_is_write = 0; + } else { + kvm_err("Load not supporded inst=0x%08x @%lx BadVaddr:%#lx\n", + inst.word, vcpu->arch.pc, vcpu->arch.badv); + kvm_arch_vcpu_dump_regs(vcpu); + vcpu->mmio_needed = 0; + } + return ret; +} + +int _kvm_complete_mmio_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; + + /* update with new PC */ + update_pc(&vcpu->arch); + switch (run->mmio.len) { + case 8: + *gpr = *(s64 *)run->mmio.data; + break; + case 4: + if (vcpu->mmio_needed == 2) + *gpr = *(int *)run->mmio.data; + else + *gpr = *(unsigned int *)run->mmio.data; + break; + case 2: + if (vcpu->mmio_needed == 2) + *gpr = *(short *) run->mmio.data; + else + *gpr = *(unsigned short *)run->mmio.data; + + break; + case 1: + if (vcpu->mmio_needed == 2) + *gpr = *(char *) run->mmio.data; + else + *gpr = *(unsigned char *) run->mmio.data; + break; + default: + kvm_err("Bad MMIO length: %d,addr is 0x%lx", + run->mmio.len, vcpu->arch.badv); + er = EMULATE_FAIL; + break; + } + + return er; +} + static int _kvm_trap_handle_gspr(struct kvm_vcpu *vcpu) { enum emulation_result er = EMULATE_DONE; @@ -323,3 +582,52 @@ static int _kvm_handle_gspr(struct kvm_vcpu *vcpu) } return ret; } + +static int _kvm_handle_mmu_fault(struct kvm_vcpu *vcpu, bool write) +{ + struct kvm_run *run = vcpu->run; + unsigned long badv = vcpu->arch.badv; + larch_inst inst; + enum emulation_result er = EMULATE_DONE; + int ret; + + ret = kvm_handle_mm_fault(vcpu, badv, write); + if (ret) { + /* Treat as MMIO */ + inst.word = vcpu->arch.badi; + if (write) { + er = _kvm_emu_mmio_write(vcpu, inst); + } else { + /* A code fetch fault doesn't count as an MMIO */ + if (kvm_is_ifetch_fault(&vcpu->arch)) { + kvm_err("%s ifetch error addr:%lx\n", __func__, badv); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + return RESUME_HOST; + } + + er = _kvm_emu_mmio_read(vcpu, inst); + } + } + + if (er == EMULATE_DONE) { + ret = RESUME_GUEST; + } else if (er == EMULATE_DO_MMIO) { + run->exit_reason = KVM_EXIT_MMIO; + ret = RESUME_HOST; + } else { + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + + return ret; +} + +static int _kvm_handle_write_fault(struct kvm_vcpu *vcpu) +{ + return _kvm_handle_mmu_fault(vcpu, true); +} + +static int _kvm_handle_read_fault(struct kvm_vcpu *vcpu) +{ + return _kvm_handle_mmu_fault(vcpu, false); +}