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Thu, 6 Apr 2023 19:05:19 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8DxXNoreS9k5KYXAA--.25227S3; Fri, 07 Apr 2023 10:00:11 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8BxLL4jeS9k17sXAA--.23369S13; Fri, 07 Apr 2023 10:00:10 +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 v5 11/30] LoongArch: KVM: Implement fpu related operations for vcpu Date: Fri, 7 Apr 2023 09:59:44 +0800 Message-Id: <20230407020003.3651096-12-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230407020003.3651096-1-zhaotianrui@loongson.cn> References: <20230407020003.3651096-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8BxLL4jeS9k17sXAA--.23369S13 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoW7KF1UXF4kKw4xXF4kKr4kWFg_yoW8ur1rpF W7Ar9YqayrG3WxK34aqr1jqr1avrWkKr1xXa47WryfAr1UtryrZF4vkrW2vF98Jw1xZFyI vF1rGF1UCFyDAwUanT9S1TB71UUUUjJqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj 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 X-Spam-Status: No, score=-0.0 required=5.0 tests=SPF_HELO_PASS,SPF_PASS autolearn=unavailable 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?1762481675894244680?= X-GMAIL-MSGID: =?utf-8?q?1762481675894244680?= Implement loongarch fpu related interface for vcpu, such as get fpu, set fpu, own fpu and lose fpu, etc. 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 e1e616769..d1e8cd402 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -245,6 +245,66 @@ 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;