From nobody Thu Dec 18 16:03:24 2025 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 48C27C77B72 for ; Mon, 17 Apr 2023 10:43:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229652AbjDQKnP (ORCPT ); Mon, 17 Apr 2023 06:43:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229508AbjDQKnM (ORCPT ); Mon, 17 Apr 2023 06:43:12 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 002D04214; Mon, 17 Apr 2023 03:42:18 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8AxEk6iGD1kIOcdAA--.34835S3; Mon, 17 Apr 2023 18:00:02 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Bx57yWGD1kua0qAA--.48254S32; Mon, 17 Apr 2023 18:00:02 +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 30/30] LoongArch: KVM: Supplement kvm document about loongarch-specific part Date: Mon, 17 Apr 2023 17:59:50 +0800 Message-Id: <20230417095950.875228-31-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230417095950.875228-1-zhaotianrui@loongson.cn> References: <20230417095950.875228-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8Bx57yWGD1kua0qAA--.48254S32 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoW3AFyUuF4rtFW3WrW3uFWrGrg_yoW7Cw4UpF ZIk3yfKr48try7t347J34jqry3GFyxtF47Ca4ftr1xC3Wjyw1kJrnFyrW8JFWUC348AF18 AFy0yw47CFyUAw7anT9S1TB71UUUUjJqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU bcxFc2x0x2IEx4CE42xK8VAvwI8IcIk0rVWrJVCq3wA2ocxC64kIII0Yj41l84x0c7CEw4 AK67xGY2AK021l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF 7I0E14v26F4UJVW0owA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x 0267AKxVW0oVCq3wAaw2AFwI0_JF0_Jw1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqjxCE c2xF0cIa020Ex4CE44I27wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E74AGY7Cv6cx26r WlOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxkF7I0En4kS14v26r126r1D MxAIw28IcxkI7VAKI48JMxAIw28IcVCjz48v1sIEY20_WwCFx2IqxVCFs4IE7xkEbVWUJV W8JwCFI7km07C267AKxVWUAVWUtwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE 14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2 IY67AKxVWDJVCq3wCI42IY6xIIjxv20xvEc7CjxVAFwI0_Cr1j6rxdMIIF0xvE42xK8VAv wI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWxJr0_GcWlIxAIcVC2z280aVCY1x0267 AKxVWxJr0_GcJvcSsGvfC2KfnxnUUI43ZEXa7xRiTKZJUUUUU== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Supplement kvm document about loongarch-specific part, such as add api introduction for GET/SET_ONE_REG, GET/SET_FPU, GET/SET_MP_STATE, etc. Signed-off-by: Tianrui Zhao --- Documentation/virt/kvm/api.rst | 71 +++++++++++++++++++++++++++++----- 1 file changed, 62 insertions(+), 9 deletions(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index a5c803f39832..84c26a577559 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -416,6 +416,12 @@ Reads the general purpose registers from the vcpu. __u64 pc; }; =20 + /* loongarch */ + struct kvm_regs { + unsigned long gpr[32]; + unsigned long pc; + }; + =20 4.12 KVM_SET_REGS ----------------- @@ -506,7 +512,7 @@ translation mode. ------------------ =20 :Capability: basic -:Architectures: x86, ppc, mips, riscv +:Architectures: x86, ppc, mips, riscv, loongarch :Type: vcpu ioctl :Parameters: struct kvm_interrupt (in) :Returns: 0 on success, negative on failure. @@ -592,6 +598,14 @@ b) KVM_INTERRUPT_UNSET =20 This is an asynchronous vcpu ioctl and can be invoked from any thread. =20 +LOONGARCH: +^^^^^^^^^^ + +Queues an external interrupt to be injected into the virtual CPU. A negati= ve +interrupt number dequeues the interrupt. + +This is an asynchronous vcpu ioctl and can be invoked from any thread. + =20 4.17 KVM_DEBUG_GUEST -------------------- @@ -737,7 +751,7 @@ signal mask. ---------------- =20 :Capability: basic -:Architectures: x86 +:Architectures: x86, loongarch :Type: vcpu ioctl :Parameters: struct kvm_fpu (out) :Returns: 0 on success, -1 on error @@ -746,7 +760,7 @@ Reads the floating point state from the vcpu. =20 :: =20 - /* for KVM_GET_FPU and KVM_SET_FPU */ + /* x86: for KVM_GET_FPU and KVM_SET_FPU */ struct kvm_fpu { __u8 fpr[8][16]; __u16 fcw; @@ -761,12 +775,22 @@ Reads the floating point state from the vcpu. __u32 pad2; }; =20 + /* loongarch: for KVM_GET_FPU and KVM_SET_FPU */ + struct kvm_fpu { + __u32 fcsr; + __u32 none; + __u64 fcc; + struct kvm_fpureg { + __u64 val64[4]; + }fpr[32]; + }; + =20 4.23 KVM_SET_FPU ---------------- =20 :Capability: basic -:Architectures: x86 +:Architectures: x86, loongarch :Type: vcpu ioctl :Parameters: struct kvm_fpu (in) :Returns: 0 on success, -1 on error @@ -775,7 +799,7 @@ Writes the floating point state to the vcpu. =20 :: =20 - /* for KVM_GET_FPU and KVM_SET_FPU */ + /* x86: for KVM_GET_FPU and KVM_SET_FPU */ struct kvm_fpu { __u8 fpr[8][16]; __u16 fcw; @@ -790,6 +814,16 @@ Writes the floating point state to the vcpu. __u32 pad2; }; =20 + /* loongarch: for KVM_GET_FPU and KVM_SET_FPU */ + struct kvm_fpu { + __u32 fcsr; + __u32 none; + __u64 fcc; + struct kvm_fpureg { + __u64 val64[4]; + }fpr[32]; + }; + =20 4.24 KVM_CREATE_IRQCHIP ----------------------- @@ -1387,7 +1421,7 @@ documentation when it pops into existence). ------------------- =20 :Capability: KVM_CAP_ENABLE_CAP -:Architectures: mips, ppc, s390, x86 +:Architectures: mips, ppc, s390, x86, loongarch :Type: vcpu ioctl :Parameters: struct kvm_enable_cap (in) :Returns: 0 on success; -1 on error @@ -1442,7 +1476,7 @@ for vm-wide capabilities. --------------------- =20 :Capability: KVM_CAP_MP_STATE -:Architectures: x86, s390, arm64, riscv +:Architectures: x86, s390, arm64, riscv, loongarch :Type: vcpu ioctl :Parameters: struct kvm_mp_state (out) :Returns: 0 on success; -1 on error @@ -1460,7 +1494,7 @@ Possible values are: =20 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D KVM_MP_STATE_RUNNABLE the vcpu is currently running - [x86,arm64,riscv] + [x86,arm64,riscv,loongarch] KVM_MP_STATE_UNINITIALIZED the vcpu is an application processor (AP) which has not yet received an INIT signal= [x86] KVM_MP_STATE_INIT_RECEIVED the vcpu has received an INIT signal, and= is @@ -1516,11 +1550,14 @@ For riscv: The only states that are valid are KVM_MP_STATE_STOPPED and KVM_MP_STATE_RUNNABLE which reflect if the vcpu is paused or not. =20 +On loongarch, the KVM_MP_STATE_RUNNABLE state is only used which reflect t= he +vcpu is runnable. + 4.39 KVM_SET_MP_STATE --------------------- =20 :Capability: KVM_CAP_MP_STATE -:Architectures: x86, s390, arm64, riscv +:Architectures: x86, s390, arm64, riscv, loongarch :Type: vcpu ioctl :Parameters: struct kvm_mp_state (in) :Returns: 0 on success; -1 on error @@ -1538,6 +1575,9 @@ For arm64/riscv: The only states that are valid are KVM_MP_STATE_STOPPED and KVM_MP_STATE_RUNNABLE which reflect if the vcpu should be paused or not. =20 +On loongarch, the KVM_MP_STATE_RUNNABLE state is only used which reflect t= he +vcpu is runnable. + 4.40 KVM_SET_IDENTITY_MAP_ADDR ------------------------------ =20 @@ -2839,6 +2879,19 @@ Following are the RISC-V D-extension registers: 0x8020 0000 0600 0020 fcsr Floating point control and status regist= er =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D= =3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D =20 +LoongArch registers are mapped using the lower 32 bits. The upper 16 bits = of +that is the register group type. + +LoongArch csr registers are used to control guest cpu or get status of gue= st +cpu, and they have the following id bit patterns:: + + 0x9030 0000 0001 00 (64-bit) + +LoongArch KVM control registers are used to implement some new defined fun= ctions +such as set vcpu counter or reset vcpu, and they have the following id bit= patterns:: + + 0x9030 0000 0002 + =20 4.69 KVM_GET_ONE_REG -------------------- --=20 2.31.1