From nobody Fri Jan 2 16:42:47 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 E8AABCD8CA9 for ; Tue, 10 Oct 2023 17:05:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233998AbjJJRFj (ORCPT ); Tue, 10 Oct 2023 13:05:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233978AbjJJRFd (ORCPT ); Tue, 10 Oct 2023 13:05:33 -0400 Received: from mail-pl1-x62d.google.com (mail-pl1-x62d.google.com [IPv6:2607:f8b0:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D14638E for ; Tue, 10 Oct 2023 10:05:30 -0700 (PDT) Received: by mail-pl1-x62d.google.com with SMTP id d9443c01a7336-1c9bf22fe05so5061575ad.2 for ; Tue, 10 Oct 2023 10:05:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1696957530; x=1697562330; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=4smwE6VqfYxKvfF0tqu7jNc/7OXpVUXHc/+OAD0MBRk=; b=FhwWGb5Xse7nvJyYxyIZeHfhdiov1sPmpAIyzOeoCGEf39LOxkt7wfJ2Z0P8A/m678 rZFtelP2j0l+cFV4L9Fd5cfVSWv91bpzgvCS53XnUBi1zh9W1Xz36U8+NoWS9joAjSbI PIzEhCDhs/CTR2GXh1mg5mra4y83r13ciVymQInsYDZrGiCQZaGGVuYTeY9T7kjMtIJK aeud+i6Sr7MfTROpnE4KzDCOMsNYMbUUKOD2aJVn1Xog8btOol7bejKOotidRPs3u8N9 cT7AmZcOJCLaEJ70+JIuVaq/Iqpb+vIlh89lPryRr+V5veLBho8HplAufaN1fMW6m+Ks 6RwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696957530; x=1697562330; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=4smwE6VqfYxKvfF0tqu7jNc/7OXpVUXHc/+OAD0MBRk=; b=rb4pnaGoL0sXjsxvP0Hw6SOJU/N/137Pv2g3OrjfHQYI3I31UrCOY5Lif/8oE+ui+q wdm/7IalD4p5Qsvitwtu9ct95QQdbbABdFVfXUMzlUj1nMY+BFLTKIi8epRwwQHUuIC0 8VTdMB4pNmOWqc79QxRAekI5K8ZtDSSCLqiNPF6+Pf4nKLgufKXwu0J/MsseZI/f4QmR wlXCrH0OD8VVH6ybk/ERlp97wIBuBOyhBW43B3poLguRSeF1timjqq/U8i+pcaIhF5XH gw1OCH2WuQzJrVpneqe6T4Nlq6zwa5niCQoKqwZAKIV29+lOks9X+NP6UPSlRWzzg0Eb mpPw== X-Gm-Message-State: AOJu0YwfL1iqKXaslnlcJ0Y8bxagtnT8FbLnfY4Y2thgmsBW4HX3way4 eFHA9Lh8AIgMn4hVQFr3TeANpg== X-Google-Smtp-Source: AGHT+IFYY1cb953bXOW6ABKFWxZoUNl8/jrL5sgqvn5jtayOnZj/D//5h5O6D4FNJ+IJsn/Z4jFWDA== X-Received: by 2002:a17:902:a402:b0:1c7:7e00:809e with SMTP id p2-20020a170902a40200b001c77e00809emr15730697plq.67.1696957529924; Tue, 10 Oct 2023 10:05:29 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([103.97.165.210]) by smtp.gmail.com with ESMTPSA id w19-20020a1709027b9300b001b89536974bsm11979868pll.202.2023.10.10.10.05.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Oct 2023 10:05:29 -0700 (PDT) From: Anup Patel To: Paolo Bonzini , Atish Patra , Palmer Dabbelt , Paul Walmsley , Greg Kroah-Hartman , Jiri Slaby Cc: Conor Dooley , Andrew Jones , kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-serial@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [PATCH 3/6] RISC-V: KVM: Forward SBI DBCN extension to user-space Date: Tue, 10 Oct 2023 22:35:00 +0530 Message-Id: <20231010170503.657189-4-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231010170503.657189-1-apatel@ventanamicro.com> References: <20231010170503.657189-1-apatel@ventanamicro.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The SBI DBCN extension needs to be emulated in user-space so let us forward console_puts() call to user-space. Signed-off-by: Anup Patel --- arch/riscv/include/asm/kvm_vcpu_sbi.h | 1 + arch/riscv/include/uapi/asm/kvm.h | 1 + arch/riscv/kvm/vcpu_sbi.c | 4 ++++ arch/riscv/kvm/vcpu_sbi_replace.c | 31 +++++++++++++++++++++++++++ 4 files changed, 37 insertions(+) diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm= /kvm_vcpu_sbi.h index 8d6d4dce8a5e..a85f95eb6e85 100644 --- a/arch/riscv/include/asm/kvm_vcpu_sbi.h +++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h @@ -69,6 +69,7 @@ extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_i= pi; extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_rfence; extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_srst; extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_hsm; +extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn; extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental; extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor; =20 diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/as= m/kvm.h index 917d8cc2489e..60d3b21dead7 100644 --- a/arch/riscv/include/uapi/asm/kvm.h +++ b/arch/riscv/include/uapi/asm/kvm.h @@ -156,6 +156,7 @@ enum KVM_RISCV_SBI_EXT_ID { KVM_RISCV_SBI_EXT_PMU, KVM_RISCV_SBI_EXT_EXPERIMENTAL, KVM_RISCV_SBI_EXT_VENDOR, + KVM_RISCV_SBI_EXT_DBCN, KVM_RISCV_SBI_EXT_MAX, }; =20 diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c index 9cd97091c723..b54fe52c915a 100644 --- a/arch/riscv/kvm/vcpu_sbi.c +++ b/arch/riscv/kvm/vcpu_sbi.c @@ -66,6 +66,10 @@ static const struct kvm_riscv_sbi_extension_entry sbi_ex= t[] =3D { .ext_idx =3D KVM_RISCV_SBI_EXT_PMU, .ext_ptr =3D &vcpu_sbi_ext_pmu, }, + { + .ext_idx =3D KVM_RISCV_SBI_EXT_DBCN, + .ext_ptr =3D &vcpu_sbi_ext_dbcn, + }, { .ext_idx =3D KVM_RISCV_SBI_EXT_EXPERIMENTAL, .ext_ptr =3D &vcpu_sbi_ext_experimental, diff --git a/arch/riscv/kvm/vcpu_sbi_replace.c b/arch/riscv/kvm/vcpu_sbi_re= place.c index 7c4d5d38a339..347c5856347e 100644 --- a/arch/riscv/kvm/vcpu_sbi_replace.c +++ b/arch/riscv/kvm/vcpu_sbi_replace.c @@ -175,3 +175,34 @@ const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_srst = =3D { .extid_end =3D SBI_EXT_SRST, .handler =3D kvm_sbi_ext_srst_handler, }; + +static int kvm_sbi_ext_dbcn_handler(struct kvm_vcpu *vcpu, + struct kvm_run *run, + struct kvm_vcpu_sbi_return *retdata) +{ + struct kvm_cpu_context *cp =3D &vcpu->arch.guest_context; + unsigned long funcid =3D cp->a6; + + switch (funcid) { + case SBI_EXT_DBCN_CONSOLE_WRITE: + case SBI_EXT_DBCN_CONSOLE_READ: + case SBI_EXT_DBCN_CONSOLE_WRITE_BYTE: + /* + * The SBI debug console functions are unconditionally + * forwarded to the userspace. + */ + kvm_riscv_vcpu_sbi_forward(vcpu, run); + retdata->uexit =3D true; + break; + default: + retdata->err_val =3D SBI_ERR_NOT_SUPPORTED; + } + + return 0; +} + +const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn =3D { + .extid_start =3D SBI_EXT_DBCN, + .extid_end =3D SBI_EXT_DBCN, + .handler =3D kvm_sbi_ext_dbcn_handler, +}; --=20 2.34.1