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[2620:137:e000::1:20]) by mx.google.com with ESMTP id p29-20020a637f5d000000b0053481a225desi7408396pgn.340.2023.06.19.01.35.31; Mon, 19 Jun 2023 01:35:51 -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 S230521AbjFSIeI (ORCPT + 99 others); Mon, 19 Jun 2023 04:34:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230363AbjFSIdK (ORCPT ); Mon, 19 Jun 2023 04:33:10 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B737BC9; Mon, 19 Jun 2023 01:33:08 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8BxLuvAEpBkiMsGAA--.14229S3; Mon, 19 Jun 2023 16:33:04 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8BxC8q3EpBkAgsgAA--.15169S13; Mon, 19 Jun 2023 16:33:03 +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, tangyouling@loongson.cn Subject: [PATCH v14 11/30] LoongArch: KVM: Implement fpu related operations for vcpu Date: Mon, 19 Jun 2023 16:32:36 +0800 Message-Id: <20230619083255.3841777-12-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230619083255.3841777-1-zhaotianrui@loongson.cn> References: <20230619083255.3841777-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8BxC8q3EpBkAgsgAA--.15169S13 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_NONE, 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?1769119417753227484?= X-GMAIL-MSGID: =?utf-8?q?1769119417753227484?= Implement LoongArch fpu related interface for vcpu, such as get fpu, set fpu, own fpu and lose fpu, etc. Reviewed-by: Bibo Mao Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/vcpu.c | 60 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index da97b77da8eb..71f5e0fb96e5 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -237,6 +237,66 @@ long kvm_arch_vcpu_ioctl(struct file *filp, return r; } +int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + int i = 0; + + /* no need vcpu_load and vcpu_put */ + fpu->fcsr = vcpu->arch.fpu.fcsr; + fpu->fcc = vcpu->arch.fpu.fcc; + for (i = 0; i < NUM_FPU_REGS; i++) + memcpy(&fpu->fpr[i], &vcpu->arch.fpu.fpr[i], FPU_REG_WIDTH / 64); + + return 0; +} + +int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + int i = 0; + + /* no need vcpu_load and vcpu_put */ + vcpu->arch.fpu.fcsr = fpu->fcsr; + vcpu->arch.fpu.fcc = fpu->fcc; + for (i = 0; i < NUM_FPU_REGS; i++) + memcpy(&vcpu->arch.fpu.fpr[i], &fpu->fpr[i], FPU_REG_WIDTH / 64); + + return 0; +} + +/* Enable FPU for guest and restore context */ +void kvm_own_fpu(struct kvm_vcpu *vcpu) +{ + preempt_disable(); + + /* + * Enable FPU for guest + */ + set_csr_euen(CSR_EUEN_FPEN); + + kvm_restore_fpu(&vcpu->arch.fpu); + vcpu->arch.aux_inuse |= KVM_LARCH_FPU; + trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_FPU); + + preempt_enable(); +} + +/* Save and disable FPU */ +void kvm_lose_fpu(struct kvm_vcpu *vcpu) +{ + preempt_disable(); + + if (vcpu->arch.aux_inuse & KVM_LARCH_FPU) { + kvm_save_fpu(&vcpu->arch.fpu); + vcpu->arch.aux_inuse &= ~KVM_LARCH_FPU; + trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU); + + /* Disable FPU */ + clear_csr_euen(CSR_EUEN_FPEN); + } + + preempt_enable(); +} + int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) { return 0;