From nobody Thu Feb 12 06:43:05 2026 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 3095DEEAA7F for ; Fri, 15 Sep 2023 01:50:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231479AbjIOBuV (ORCPT ); Thu, 14 Sep 2023 21:50:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47546 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231379AbjIOBuG (ORCPT ); Thu, 14 Sep 2023 21:50:06 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 9E6542710; Thu, 14 Sep 2023 18:50:01 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8CxLOtFuANlyf4nAA--.6079S3; Fri, 15 Sep 2023 09:49:57 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Axndw9uANl+ioGAA--.11927S11; Fri, 15 Sep 2023 09:49:56 +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 v21 09/29] LoongArch: KVM: Implement vcpu get, vcpu set registers Date: Fri, 15 Sep 2023 09:49:29 +0800 Message-Id: <20230915014949.1222777-10-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230915014949.1222777-1-zhaotianrui@loongson.cn> References: <20230915014949.1222777-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8Axndw9uANl+ioGAA--.11927S11 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Implement LoongArch vcpu get registers and set registers operations, it is called when user space use the ioctl interface to get or set regs. Reviewed-by: Bibo Mao Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/vcpu.c | 244 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 244 insertions(+) diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index bfc2ec1a88..1cc53f56d0 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -13,6 +13,250 @@ #define CREATE_TRACE_POINTS #include "trace.h" =20 +int kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v) +{ + unsigned long val; + struct loongarch_csrs *csr =3D vcpu->arch.csr; + + if (get_gcsr_flag(id) & INVALID_GCSR) + return -EINVAL; + + if (id =3D=3D LOONGARCH_CSR_ESTAT) { + /* interrupt status IP0 -- IP7 from GINTC */ + val =3D kvm_read_sw_gcsr(csr, LOONGARCH_CSR_GINTC) & 0xff; + *v =3D kvm_read_sw_gcsr(csr, id) | (val << 2); + return 0; + } + + /* + * get software csr state if csrid is valid, since software + * csr state is consistent with hardware + */ + *v =3D kvm_read_sw_gcsr(csr, id); + + return 0; +} + +int kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 val) +{ + struct loongarch_csrs *csr =3D vcpu->arch.csr; + int ret =3D 0, gintc; + + if (get_gcsr_flag(id) & INVALID_GCSR) + return -EINVAL; + + if (id =3D=3D LOONGARCH_CSR_ESTAT) { + /* estat IP0~IP7 inject through guestexcept */ + gintc =3D (val >> 2) & 0xff; + kvm_set_sw_gcsr(csr, LOONGARCH_CSR_GINTC, gintc); + + gintc =3D val & ~(0xffUL << 2); + kvm_set_sw_gcsr(csr, LOONGARCH_CSR_ESTAT, gintc); + + return ret; + } + + kvm_write_sw_gcsr(csr, id, val); + return ret; +} + +static int kvm_get_one_reg(struct kvm_vcpu *vcpu, + const struct kvm_one_reg *reg, u64 *v) +{ + int id, ret =3D 0; + u64 type =3D reg->id & KVM_REG_LOONGARCH_MASK; + + switch (type) { + case KVM_REG_LOONGARCH_CSR: + id =3D KVM_GET_IOC_CSRIDX(reg->id); + ret =3D kvm_getcsr(vcpu, id, v); + break; + case KVM_REG_LOONGARCH_CPUCFG: + id =3D KVM_GET_IOC_CPUCFG_IDX(reg->id); + if (id >=3D 0 && id < KVM_MAX_CPUCFG_REGS) + *v =3D vcpu->arch.cpucfg[id]; + else + ret =3D -EINVAL; + break; + case KVM_REG_LOONGARCH_KVM: + switch (reg->id & 0xf) { + case 4: /* counter reg */ + *v =3D drdtime() + vcpu->kvm->arch.time_offset; + break; + default: + ret =3D -EINVAL; + break; + } + break; + default: + ret =3D -EINVAL; + break; + } + return ret; +} + +static int kvm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *re= g) +{ + int ret =3D 0; + u64 v, size =3D reg->id & KVM_REG_SIZE_MASK; + + switch (size) { + case KVM_REG_SIZE_U64: + ret =3D kvm_get_one_reg(vcpu, reg, &v); + if (ret) + return ret; + ret =3D put_user(v, (u64 __user *)(long)reg->addr); + break; + default: + ret =3D -EINVAL; + break; + } + return ret; +} + +static int kvm_set_one_reg(struct kvm_vcpu *vcpu, + const struct kvm_one_reg *reg, + u64 v) +{ + int id, ret =3D 0; + u64 type =3D reg->id & KVM_REG_LOONGARCH_MASK; + + switch (type) { + case KVM_REG_LOONGARCH_CSR: + id =3D KVM_GET_IOC_CSRIDX(reg->id); + ret =3D kvm_setcsr(vcpu, id, v); + break; + case KVM_REG_LOONGARCH_CPUCFG: + id =3D KVM_GET_IOC_CPUCFG_IDX(reg->id); + if (id >=3D 0 && id < KVM_MAX_CPUCFG_REGS) + vcpu->arch.cpucfg[id] =3D (u32)v; + else + ret =3D -EINVAL; + break; + case KVM_REG_LOONGARCH_KVM: + switch (reg->id & 0xf) { + case 3: /* counter reg */ + /* + * gftoffset is relative with board, not vcpu + * only set for the first time for smp system + */ + if (vcpu->vcpu_id =3D=3D 0) + vcpu->kvm->arch.time_offset =3D (signed long)(v - drdtime()); + break; + case 4: /* vcpu reset */ + kvm_reset_timer(vcpu); + memset(&vcpu->arch.irq_pending, 0, sizeof(vcpu->arch.irq_pending)); + memset(&vcpu->arch.irq_clear, 0, sizeof(vcpu->arch.irq_clear)); + break; + default: + ret =3D -EINVAL; + break; + } + break; + default: + ret =3D -EINVAL; + break; + } + + return ret; +} + +static int kvm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *re= g) +{ + int ret =3D 0; + u64 v, size =3D reg->id & KVM_REG_SIZE_MASK; + + switch (size) { + case KVM_REG_SIZE_U64: + ret =3D get_user(v, (u64 __user *)(long)reg->addr); + if (ret) + return ret; + break; + default: + return -EINVAL; + } + + return kvm_set_one_reg(vcpu, reg, v); +} + +int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + return -ENOIOCTLCMD; +} + +int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, + struct kvm_sregs *sregs) +{ + return -ENOIOCTLCMD; +} + +int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *r= egs) +{ + int i; + + for (i =3D 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++) + regs->gpr[i] =3D vcpu->arch.gprs[i]; + + regs->pc =3D vcpu->arch.pc; + + return 0; +} + +int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *r= egs) +{ + int i; + + for (i =3D 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++) + vcpu->arch.gprs[i] =3D regs->gpr[i]; + vcpu->arch.gprs[0] =3D 0; /* zero is special, and cannot be set. */ + vcpu->arch.pc =3D regs->pc; + + return 0; +} + +long kvm_arch_vcpu_ioctl(struct file *filp, + unsigned int ioctl, unsigned long arg) +{ + struct kvm_vcpu *vcpu =3D filp->private_data; + void __user *argp =3D (void __user *)arg; + long r; + + /* + * Only software CSR should be modified + * + * If any hardware CSR register is modified, vcpu_load/vcpu_put pair + * should be used. Since CSR registers owns by this vcpu, if switch + * to other vcpus, other vcpus need reload CSR register. + * + * If software CSR is modified, bit KVM_LARCH_HWCSR_USABLE should + * be clear in vcpu->arch.aux_inuse, and vcpu_load will check + * aux_inuse flag and reload CSR form sw + */ + + switch (ioctl) { + case KVM_SET_ONE_REG: + case KVM_GET_ONE_REG: { + struct kvm_one_reg reg; + + r =3D -EFAULT; + if (copy_from_user(®, argp, sizeof(reg))) + break; + if (ioctl =3D=3D KVM_SET_ONE_REG) { + r =3D kvm_set_reg(vcpu, ®); + vcpu->arch.aux_inuse &=3D ~KVM_LARCH_HWCSR_USABLE; + } else + r =3D kvm_get_reg(vcpu, ®); + break; + } + default: + r =3D -ENOIOCTLCMD; + break; + } + + return r; +} + int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) { return 0; --=20 2.39.1