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[2620:137:e000::1:20]) by mx.google.com with ESMTP id o8-20020aa79788000000b006436ead4abasi1824049pfp.246.2023.05.09.01.08.55; Tue, 09 May 2023 01:09:10 -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 S234359AbjEIHzS (ORCPT + 99 others); Tue, 9 May 2023 03:55:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37732 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234670AbjEIHyD (ORCPT ); Tue, 9 May 2023 03:54:03 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id C4522D2C5; Tue, 9 May 2023 00:54:00 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8Bxb+sX_FlkiuMGAA--.11282S3; Tue, 09 May 2023 15:53:59 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8BxFLUK_FlkIEhSAA--.16908S25; Tue, 09 May 2023 15:53:58 +0800 (CST) From: Tianrui Zhao To: Paolo Bonzini , Huacai Chen , WANG Xuerui Cc: 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 v9 23/30] LoongArch: KVM: Implement handle gspr exception Date: Tue, 9 May 2023 15:53:39 +0800 Message-Id: <20230509075346.1023386-24-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230509075346.1023386-1-zhaotianrui@loongson.cn> References: <20230509075346.1023386-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8BxFLUK_FlkIEhSAA--.16908S25 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoWxZrW3CrWrJF18Ary8tr13Jwb_yoW5ZF4kpr W7Z34F9r4kJrySyw4aqrsYvrn0va18Kry7XasxJ343u3y7t3s5Jr40yrZFyF1DKrySvF4x Za15tF13CF1UAaUanT9S1TB71UUUUjJqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj 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=1.4 required=5.0 tests=BAYES_00,RCVD_IN_SBL_CSS, SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Level: * 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?1765403263318461574?= X-GMAIL-MSGID: =?utf-8?q?1765403263318461574?= Implement kvm handle gspr exception interface, including emulate the reading and writing of cpucfg, csr, iocsr resource. Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/exit.c | 115 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c index 3fdb42939a05..26283a9d3c6d 100644 --- a/arch/loongarch/kvm/exit.c +++ b/arch/loongarch/kvm/exit.c @@ -208,3 +208,118 @@ int _kvm_emu_idle(struct kvm_vcpu *vcpu) return EMULATE_DONE; } + +static int _kvm_trap_handle_gspr(struct kvm_vcpu *vcpu) +{ + enum emulation_result er = EMULATE_DONE; + struct kvm_run *run = vcpu->run; + larch_inst inst; + unsigned long curr_pc; + int rd, rj; + unsigned int index; + + /* + * Fetch the instruction. + */ + inst.word = vcpu->arch.badi; + curr_pc = vcpu->arch.pc; + update_pc(&vcpu->arch); + + trace_kvm_exit_gspr(vcpu, inst.word); + er = EMULATE_FAIL; + switch (((inst.word >> 24) & 0xff)) { + case 0x0: + /* cpucfg GSPR */ + if (inst.reg2_format.opcode == 0x1B) { + rd = inst.reg2_format.rd; + rj = inst.reg2_format.rj; + ++vcpu->stat.cpucfg_exits; + index = vcpu->arch.gprs[rj]; + + vcpu->arch.gprs[rd] = read_cpucfg(index); + /* Nested KVM is not supported */ + if (index == 2) + vcpu->arch.gprs[rd] &= ~CPUCFG2_LVZP; + if (index == 6) + vcpu->arch.gprs[rd] &= ~CPUCFG6_PMP; + er = EMULATE_DONE; + } + break; + case 0x4: + /* csr GSPR */ + er = _kvm_handle_csr(vcpu, inst); + break; + case 0x6: + /* iocsr,cache,idle GSPR */ + switch (((inst.word >> 22) & 0x3ff)) { + case 0x18: + /* cache GSPR */ + er = EMULATE_DONE; + trace_kvm_exit_cache(vcpu, KVM_TRACE_EXIT_CACHE); + break; + case 0x19: + /* iocsr/idle GSPR */ + switch (((inst.word >> 15) & 0x1ffff)) { + case 0xc90: + /* iocsr GSPR */ + er = _kvm_emu_iocsr(inst, run, vcpu); + break; + case 0xc91: + /* idle GSPR */ + er = _kvm_emu_idle(vcpu); + break; + default: + er = EMULATE_FAIL; + break; + } + break; + default: + er = EMULATE_FAIL; + break; + } + break; + default: + er = EMULATE_FAIL; + break; + } + + /* Rollback PC only if emulation was unsuccessful */ + if (er == EMULATE_FAIL) { + kvm_err("[%#lx]%s: unsupported gspr instruction 0x%08x\n", + curr_pc, __func__, inst.word); + + kvm_arch_vcpu_dump_regs(vcpu); + vcpu->arch.pc = curr_pc; + } + return er; +} + +/* + * Execute cpucfg instruction will tirggerGSPR, + * Also the access to unimplemented csrs 0x15 + * 0x16, 0x50~0x53, 0x80, 0x81, 0x90~0x95, 0x98 + * 0xc0~0xff, 0x100~0x109, 0x500~0x502, + * cache_op, idle_op iocsr ops the same + */ +static int _kvm_handle_gspr(struct kvm_vcpu *vcpu) +{ + enum emulation_result er = EMULATE_DONE; + int ret = RESUME_GUEST; + + er = _kvm_trap_handle_gspr(vcpu); + + if (er == EMULATE_DONE) { + ret = RESUME_GUEST; + } else if (er == EMULATE_DO_MMIO) { + vcpu->run->exit_reason = KVM_EXIT_MMIO; + ret = RESUME_HOST; + } else if (er == EMULATE_DO_IOCSR) { + vcpu->run->exit_reason = KVM_EXIT_LOONGARCH_IOCSR; + ret = RESUME_HOST; + } else { + kvm_err("%s internal error\n", __func__); + vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + ret = RESUME_HOST; + } + return ret; +}