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[2620:137:e000::1:20]) by mx.google.com with ESMTP id u63-20020a638542000000b00513c817a392si9960641pgd.405.2023.04.17.04.17.19; Mon, 17 Apr 2023 04:17:32 -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 S229802AbjDQKsh (ORCPT + 99 others); Mon, 17 Apr 2023 06:48:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229547AbjDQKsf (ORCPT ); Mon, 17 Apr 2023 06:48:35 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 10FDC1B1; Mon, 17 Apr 2023 03:47:48 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8DxE0yTFT1k4+MdAA--.46743S3; Mon, 17 Apr 2023 17:46:59 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxtryKFT1kyagqAA--.47974S27; Mon, 17 Apr 2023 17:46:58 +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 25/30] LoongArch: KVM: Implement handle fpu exception Date: Mon, 17 Apr 2023 17:46:44 +0800 Message-Id: <20230417094649.874671-26-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230417094649.874671-1-zhaotianrui@loongson.cn> References: <20230417094649.874671-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8CxtryKFT1kyagqAA--.47974S27 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoW7trWDZrW7uw1UtrW8JFWDArb_yoW8JFW8pF WfAwnYkr48Wry7ta9Iy3ZFqrsxArWkKry7Wr9Fk345Zw4Ut3s5XF48KrWvgFy5Kr1rXa1S qr13KF98uF1UJ3DanT9S1TB71UUUUjJqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj 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=-1.9 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?1763421981436950475?= X-GMAIL-MSGID: =?utf-8?q?1763421981436950475?= Implement handle fpu exception, using kvm_own_fpu to enable fpu for guest. Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/exit.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c index 1237ceb06d0c..10f9922a7e76 100644 --- a/arch/loongarch/kvm/exit.c +++ b/arch/loongarch/kvm/exit.c @@ -631,3 +631,29 @@ static int _kvm_handle_read_fault(struct kvm_vcpu *vcpu) { return _kvm_handle_mmu_fault(vcpu, false); } + +/** + * _kvm_handle_fpu_disabled() - Guest used fpu however it is disabled at host + * @vcpu: Virtual CPU context. + * + * Handle when the guest attempts to use fpu which hasn't been allowed + * by the root context. + */ +static int _kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + + /* + * If guest FPU not present, the FPU operation should have been + * treated as a reserved instruction! + * If FPU already in use, we shouldn't get this at all. + */ + if (WARN_ON(vcpu->arch.aux_inuse & KVM_LARCH_FPU)) { + kvm_err("%s internal error\n", __func__); + run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + return RESUME_HOST; + } + + kvm_own_fpu(vcpu); + return RESUME_GUEST; +}