From patchwork Tue May 30 01:52:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: zhaotianrui X-Patchwork-Id: 13259108 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76C26C7EE23 for ; Tue, 30 May 2023 02:04:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229833AbjE3CEZ (ORCPT ); Mon, 29 May 2023 22:04:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45100 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229749AbjE3CEY (ORCPT ); Mon, 29 May 2023 22:04:24 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 15935B5; Mon, 29 May 2023 19:03:43 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8AxXuvcVnVkRmoCAA--.1160S3; Tue, 30 May 2023 09:52:28 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8AxQbTYVnVkQNZ_AA--.12077S13; Tue, 30 May 2023 09:52:28 +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 v12 11/31] LoongArch: KVM: Implement fpu related operations for vcpu Date: Tue, 30 May 2023 09:52:03 +0800 Message-Id: <20230530015223.147755-12-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230530015223.147755-1-zhaotianrui@loongson.cn> References: <20230530015223.147755-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8AxQbTYVnVkQNZ_AA--.12077S13 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoW7AF45CryDuFWruw4DKw1Dtrb_yoW8ur1kpF W7Ar98X3yrG3WxK3yaqr1jvr1av3ykKr1xXa47Xry3Ar1UtryrZr4vkrW2vF98Jw1fZFyI yF1fGF45CFyDAwUanT9S1TB71UUUUjJqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU bxxFc2x0x2IEx4CE42xK8VAvwI8IcIk0rVWrJVCq3wA2ocxC64kIII0Yj41l84x0c7CEw4 AK67xGY2AK021l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF 7I0E14v26r4UJVWxJr1l84ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aV CY1x0267AKxVW8Jr0_Cr1UM2kKe7AKxVWUAVWUtwAS0I0E0xvYzxvE52x082IY62kv0487 Mc804VCY07AIYIkI8VC2zVCFFI0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VCjz48v1s IEY20_WwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2AFwI0_ JF0_Jw1l42xK82IYc2Ij64vIr41l42xK82IY6x8ErcxFaVAv8VWrMxC20s026xCaFVCjc4 AY6r1j6r4UMxCIbckI1I0E14v26r126r1DMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCj r7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6x IIjxv20xvE14v26w1j6s0DMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UMIIF0xvE 42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVW8Jr0_Cr1UMIIF0xvEx4A2js IEc7CjxVAFwI0_Gr1j6F4UJbIYCTnIWIevJa73UjIFyTuYvj4RKpBTUUUUU Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Implement LoongArch fpu related interface for vcpu, such as get fpu, set fpu, own fpu and lose fpu, etc. Signed-off-by: Tianrui Zhao Reviewed-by: Bibo, Mao --- 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 5a88f815c412..60213f7f7bac 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -244,6 +244,66 @@ 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;