From nobody Tue Dec 16 03:22:43 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 7800AC001DF for ; Fri, 20 Oct 2023 07:22:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376412AbjJTHV7 (ORCPT ); Fri, 20 Oct 2023 03:21:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41476 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376403AbjJTHV4 (ORCPT ); Fri, 20 Oct 2023 03:21:56 -0400 Received: from mail-oi1-x22e.google.com (mail-oi1-x22e.google.com [IPv6:2607:f8b0:4864:20::22e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 468AB1A3 for ; Fri, 20 Oct 2023 00:21:55 -0700 (PDT) Received: by mail-oi1-x22e.google.com with SMTP id 5614622812f47-3af6bd48093so311529b6e.3 for ; Fri, 20 Oct 2023 00:21:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1697786514; x=1698391314; 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=vFjlFx01Ut+IIk7lMz+iwDuvVBUbWHCR3u/gBbk/FU0=; b=cb8kwDbfcMYKuSbeSM4vmK4dk5HzH6+UGU9Z4Cm9buYLbisAywChN7kMLnISn5KVCX 4iEg08DokJN7xvb1BkDT73ttxPDnbStGLtP/6xk0fZaF1syrUmO1QYmkRXv8jbLIqPGI 7g8Fv5F/gIwBBHj59qwC3zPpZC5m9kKpl6dNSQpenDmKNCFPLr0RMNrcAX4wXpCNBrvW eqk79GYyEO9VH4V8sC52dBFkZr60OL+mAUu7j9ytcxNFJF7NHpm9yIMJO7aiWPZwAHkv q45YENrxvOIK0hLlEQSOwLCkrqjqbKDiBokIL35OGLchAHkXvgTwUgqFi5BI9UU6NkIV 74UQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697786514; x=1698391314; 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=vFjlFx01Ut+IIk7lMz+iwDuvVBUbWHCR3u/gBbk/FU0=; b=G6rSjhstIF5YfzxecRE3Sos1QSO2reuOFKUHC4gb059JHQQPNnRjiS40j8e/yJNbnI 1kbkGMxYalOmWEdp0sfmiNxPXt7WnLxZzcszSrQc+9Z/F9RE8ccIVJTyRMfM8OzUORiW pdhj6Pc2USDD1T1GehEnHggbo0RkyosWOq0tjkMqYnz+DEakHJ3sEw3hg/O6l54mxMzC xVRFktMFuvqCbF7E/IrFr6wTmulMUAeEhHphAl1/U+wmRPSlm/I58NsdqVduyOQk/WI+ QOAtqwUdR/QdsbfgPCdE1bgS8l3URL0C6bQT9Mcvd3RgcxpJr2YaX1TMs3lA2vZYk3LY szgw== X-Gm-Message-State: AOJu0YzvCTxfenxNWSSOvZeSJ8oJXpqPZnqRLTa696N6EEnvCMFKBGHG 5A15LVLQpoNqyad+NTHuNNLS0Q== X-Google-Smtp-Source: AGHT+IHCf4SRFvcjUaBZbUoLW1qmUD5qW9WnhX5EFjNLnYxx3oBY2eRFWdyPRUuwwRReyZ05UhdEZg== X-Received: by 2002:a05:6808:15a3:b0:3ad:ffa4:dfee with SMTP id t35-20020a05680815a300b003adffa4dfeemr1187937oiw.51.1697786514419; Fri, 20 Oct 2023 00:21:54 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([171.76.83.81]) by smtp.gmail.com with ESMTPSA id v12-20020a63f20c000000b005b32d6b4f2fsm828204pgh.81.2023.10.20.00.21.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 00:21:54 -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 v3 1/9] RISC-V: Add defines for SBI debug console extension Date: Fri, 20 Oct 2023 12:51:32 +0530 Message-Id: <20231020072140.900967-2-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231020072140.900967-1-apatel@ventanamicro.com> References: <20231020072140.900967-1-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" We add SBI debug console extension related defines/enum to the asm/sbi.h header. Signed-off-by: Anup Patel Reviewed-by: Andrew Jones --- arch/riscv/include/asm/sbi.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h index 5b4a1bf5f439..12dfda6bb924 100644 --- a/arch/riscv/include/asm/sbi.h +++ b/arch/riscv/include/asm/sbi.h @@ -30,6 +30,7 @@ enum sbi_ext_id { SBI_EXT_HSM =3D 0x48534D, SBI_EXT_SRST =3D 0x53525354, SBI_EXT_PMU =3D 0x504D55, + SBI_EXT_DBCN =3D 0x4442434E, =20 /* Experimentals extensions must lie within this range */ SBI_EXT_EXPERIMENTAL_START =3D 0x08000000, @@ -236,6 +237,12 @@ enum sbi_pmu_ctr_type { /* Flags defined for counter stop function */ #define SBI_PMU_STOP_FLAG_RESET (1 << 0) =20 +enum sbi_ext_dbcn_fid { + SBI_EXT_DBCN_CONSOLE_WRITE =3D 0, + SBI_EXT_DBCN_CONSOLE_READ =3D 1, + SBI_EXT_DBCN_CONSOLE_WRITE_BYTE =3D 2, +}; + #define SBI_SPEC_VERSION_DEFAULT 0x1 #define SBI_SPEC_VERSION_MAJOR_SHIFT 24 #define SBI_SPEC_VERSION_MAJOR_MASK 0x7f --=20 2.34.1 From nobody Tue Dec 16 03:22:43 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 BBACDC004C0 for ; Fri, 20 Oct 2023 07:22:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376436AbjJTHWJ (ORCPT ); Fri, 20 Oct 2023 03:22:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41558 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376419AbjJTHWC (ORCPT ); Fri, 20 Oct 2023 03:22:02 -0400 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D2911D5A for ; Fri, 20 Oct 2023 00:21:59 -0700 (PDT) Received: by mail-pf1-x429.google.com with SMTP id d2e1a72fcca58-6b87c1edfd5so463385b3a.1 for ; Fri, 20 Oct 2023 00:21:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1697786519; x=1698391319; 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=eeCDV01Cfgp2ua0LgBWyAWr2dv9+xpkaYGG6VewjHJM=; b=YIVl7jqh/mVMZvM7LpYq+nOKqOw0HllLkePgMOp26Pw8rv5lL+UhDis0N0Qmb0/L4k h3k7vJWIfx5rhbj7o6BRaYriDzP/v4SI69KzKks9Tyjz1vcxR080XMEY0okHcBeaOqJF 80AERFZoJrWib+yAsXj1tjtRNFYxBDFjo/CGtSnl3SQzIMwcQM2tzYuPnGsuMiMk9p+z Kl/HcD0bCY6Wb19ctXbpTL4RGQBKriySV8Fv2dZkr9z2kWMZbf0GezNra/rlJlHDKo62 CsIkxPfChxBzGj9utFNEufUNYGGUqz9J7js2r4Tlo1DBhdnVyLLJ8hQLVG1oDymfSWSI Yjsw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697786519; x=1698391319; 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=eeCDV01Cfgp2ua0LgBWyAWr2dv9+xpkaYGG6VewjHJM=; b=bCqBNwIpW67WENPea5QQZBsAsVxw7O+xLY71ijmjebGFNL4soYlzx+GlhW0O8RaOOo 0u++iaTqJml7hrYqeRj66iHKm3PZaQiFw8mJMzdQ0yVGFfJQ5eMV/YcZOMZeInxjzlyd mMTr812bWdFUZPWxrMQgzpnN9AMXfjiHgSKSfQuGDZiIjSLFIz2I4bL3GIpcqEhSZg9k q/2NU21vTyscraIl/aGodxhy8ytPEJxCs71ewD3Dxi7TyKAlxPV16MSCOAYV68em0WJI 5hXrIWda/J/6RNfIEyZnCtiFJWNaLSQX3aTK6dWmTXmb7Q+tg8pUn8gVTaF90jbAGkN2 ZZOw== X-Gm-Message-State: AOJu0YyMuXWzUBrdFyxRL+KGnTdT6W69guSSyETBu+xk4/+pB71xFvVj 3IfDhBzD0nPRwXFdufUA9V5aTQ== X-Google-Smtp-Source: AGHT+IHW872RFsEW0M8OTGxKAzWnTo/8F6Le59a6yN6WSYq8GfyXYOW1jHmUi8NhTnVPlD9i+6DmJA== X-Received: by 2002:a05:6a00:b8e:b0:6be:4789:97ba with SMTP id g14-20020a056a000b8e00b006be478997bamr1029478pfj.3.1697786518893; Fri, 20 Oct 2023 00:21:58 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([171.76.83.81]) by smtp.gmail.com with ESMTPSA id v12-20020a63f20c000000b005b32d6b4f2fsm828204pgh.81.2023.10.20.00.21.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 00:21:58 -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 v3 2/9] RISC-V: KVM: Change the SBI specification version to v2.0 Date: Fri, 20 Oct 2023 12:51:33 +0530 Message-Id: <20231020072140.900967-3-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231020072140.900967-1-apatel@ventanamicro.com> References: <20231020072140.900967-1-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" We will be implementing SBI DBCN extension for KVM RISC-V so let us change the KVM RISC-V SBI specification version to v2.0. Signed-off-by: Anup Patel Reviewed-by: Andrew Jones --- arch/riscv/include/asm/kvm_vcpu_sbi.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm= /kvm_vcpu_sbi.h index cdcf0ff07be7..8d6d4dce8a5e 100644 --- a/arch/riscv/include/asm/kvm_vcpu_sbi.h +++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h @@ -11,7 +11,7 @@ =20 #define KVM_SBI_IMPID 3 =20 -#define KVM_SBI_VERSION_MAJOR 1 +#define KVM_SBI_VERSION_MAJOR 2 #define KVM_SBI_VERSION_MINOR 0 =20 enum kvm_riscv_sbi_ext_status { --=20 2.34.1 From nobody Tue Dec 16 03:22:43 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 3099BC001DF for ; Fri, 20 Oct 2023 07:22:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376456AbjJTHWP (ORCPT ); Fri, 20 Oct 2023 03:22:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41576 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235634AbjJTHWH (ORCPT ); Fri, 20 Oct 2023 03:22:07 -0400 Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A81F2D75 for ; Fri, 20 Oct 2023 00:22:04 -0700 (PDT) Received: by mail-pf1-x42b.google.com with SMTP id d2e1a72fcca58-6bd32d1a040so498692b3a.3 for ; Fri, 20 Oct 2023 00:22:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1697786524; x=1698391324; 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=m3zCDz3wNvDFZIfhQp3mdMMGRfliX9zzX2s9SoD5fk8=; b=eWZlqXMTae+4e206soGPMi6RkzcMLXzh8ofE7F7z06HK/UrklYWeHlBX0krBYyDGu8 N1+7InlbG1xoUhzYLYSEZut5c9x47hgaVeoVXKYwcqkGbDCfeZRvSNQ288wV/tzz4lAY jjG5rimOYT78L7XcF/kSbsZyKRIfaOGoiyq9zi1YVxY0JT7VQ4d6xiVArGccQwcSAGru JuCa7R9f2bXmti6sovoFiVA4BoF5ZlpOA/9eTX+yf50EeEzU/WHwHIRjs1fa95YdwuWc wnsL4lSVed+c8cL5i0bxQCpCRVKDmuNfN8UHJTg0g/0rZQlq9SYaPqido46ndoIwePlu sWUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697786524; x=1698391324; 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=m3zCDz3wNvDFZIfhQp3mdMMGRfliX9zzX2s9SoD5fk8=; b=hjnCq5C9GlLoo2SBfIiE74zHM6uKWCYWeP1pNjaErgOTb/EbxdOvRpRvVzb/tpZCtu GLPirSfJInPhGmW4bLEVC1nehGU6vL2mC5nvDX4Ot7vWbXAJXrJHdmaZkRQDxDJOjsXK aGzAg3jeXml/QDitXF7g82PoKN+lRO9bCs7wj041NnX2Q6282PGu0hV6giZsIOn6Fda2 HWjZAoE9Fiv5YnbuLQ9BjhKVB26aJtEYkxYk87rGHf8D++o5Cmg2QcEzrzAN9P5KHIiw aU3udwbbmD9vG8i0F0tAbcqEZFBkJMvOkfY5GItodt/rGCiHzwYMe2z9sZ4bL+Wjljo1 VK3A== X-Gm-Message-State: AOJu0YzCvQedg7iMxXvwWVVry2CBKuk9yskZD9vLWRvR5IJrJrlpS/Tx 27z6a7iT+gbwlXh20GlnU9ZAmw== X-Google-Smtp-Source: AGHT+IG244Unqcch61/RKDkaln/AZV8DtWkK/fAUAz824/pCQp9YvCbi/8qrpjv0yroTiFuFOsikCg== X-Received: by 2002:aa7:962b:0:b0:690:38b6:b2db with SMTP id r11-20020aa7962b000000b0069038b6b2dbmr951624pfg.6.1697786523600; Fri, 20 Oct 2023 00:22:03 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([171.76.83.81]) by smtp.gmail.com with ESMTPSA id v12-20020a63f20c000000b005b32d6b4f2fsm828204pgh.81.2023.10.20.00.21.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 00:22:03 -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 v3 3/9] RISC-V: KVM: Allow some SBI extensions to be disabled by default Date: Fri, 20 Oct 2023 12:51:34 +0530 Message-Id: <20231020072140.900967-4-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231020072140.900967-1-apatel@ventanamicro.com> References: <20231020072140.900967-1-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" Currently, all SBI extensions are enabled by default which is problematic for SBI extensions (such as DBCN) which are forwarded to the KVM user-space because we might have an older KVM user-space which is not aware/ready to handle newer SBI extensions. Ideally, the SBI extensions forwarded to the KVM user-space must be disabled by default. To address above, we allow certain SBI extensions to be disabled by default so that KVM user-space must explicitly enable such SBI extensions to receive forwarded calls from Guest VCPU. Signed-off-by: Anup Patel Reviewed-by: Andrew Jones --- arch/riscv/include/asm/kvm_vcpu_sbi.h | 4 ++ arch/riscv/kvm/vcpu.c | 6 +++ arch/riscv/kvm/vcpu_sbi.c | 57 +++++++++++++-------------- 3 files changed, 38 insertions(+), 29 deletions(-) diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm= /kvm_vcpu_sbi.h index 8d6d4dce8a5e..c02bda5559d7 100644 --- a/arch/riscv/include/asm/kvm_vcpu_sbi.h +++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h @@ -35,6 +35,9 @@ struct kvm_vcpu_sbi_return { struct kvm_vcpu_sbi_extension { unsigned long extid_start; unsigned long extid_end; + + bool default_unavail; + /** * SBI extension handler. It can be defined for a given extension or grou= p of * extension. But it should always return linux error codes rather than S= BI @@ -59,6 +62,7 @@ int kvm_riscv_vcpu_get_reg_sbi_ext(struct kvm_vcpu *vcpu, const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext( struct kvm_vcpu *vcpu, unsigned long extid); int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run); +void kvm_riscv_vcpu_sbi_init(struct kvm_vcpu *vcpu); =20 #ifdef CONFIG_RISCV_SBI_V01 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01; diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index c061a1c5fe98..e087c809073c 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -141,6 +141,12 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) if (rc) return rc; =20 + /* + * Setup SBI extensions + * NOTE: This must be the last thing to be initialized. + */ + kvm_riscv_vcpu_sbi_init(vcpu); + /* Reset VCPU */ kvm_riscv_reset_vcpu(vcpu); =20 diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c index 9cd97091c723..bda8b0b33343 100644 --- a/arch/riscv/kvm/vcpu_sbi.c +++ b/arch/riscv/kvm/vcpu_sbi.c @@ -155,14 +155,8 @@ static int riscv_vcpu_set_sbi_ext_single(struct kvm_vc= pu *vcpu, if (!sext) return -ENOENT; =20 - /* - * We can't set the extension status to available here, since it may - * have a probe() function which needs to confirm availability first, - * but it may be too early to call that here. We can set the status to - * unavailable, though. - */ - if (!reg_val) - scontext->ext_status[sext->ext_idx] =3D + scontext->ext_status[sext->ext_idx] =3D (reg_val) ? + KVM_RISCV_SBI_EXT_AVAILABLE : KVM_RISCV_SBI_EXT_UNAVAILABLE; =20 return 0; @@ -188,16 +182,8 @@ static int riscv_vcpu_get_sbi_ext_single(struct kvm_vc= pu *vcpu, if (!sext) return -ENOENT; =20 - /* - * If the extension status is still uninitialized, then we should probe - * to determine if it's available, but it may be too early to do that - * here. The best we can do is report that the extension has not been - * disabled, i.e. we return 1 when the extension is available and also - * when it only may be available. - */ - *reg_val =3D scontext->ext_status[sext->ext_idx] !=3D - KVM_RISCV_SBI_EXT_UNAVAILABLE; - + *reg_val =3D scontext->ext_status[sext->ext_idx] =3D=3D + KVM_RISCV_SBI_EXT_AVAILABLE; return 0; } =20 @@ -337,18 +323,8 @@ const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find= _ext( scontext->ext_status[entry->ext_idx] =3D=3D KVM_RISCV_SBI_EXT_AVAILABLE) return ext; - if (scontext->ext_status[entry->ext_idx] =3D=3D - KVM_RISCV_SBI_EXT_UNAVAILABLE) - return NULL; - if (ext->probe && !ext->probe(vcpu)) { - scontext->ext_status[entry->ext_idx] =3D - KVM_RISCV_SBI_EXT_UNAVAILABLE; - return NULL; - } =20 - scontext->ext_status[entry->ext_idx] =3D - KVM_RISCV_SBI_EXT_AVAILABLE; - return ext; + return NULL; } } =20 @@ -419,3 +395,26 @@ int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, st= ruct kvm_run *run) =20 return ret; } + +void kvm_riscv_vcpu_sbi_init(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_sbi_context *scontext =3D &vcpu->arch.sbi_context; + const struct kvm_riscv_sbi_extension_entry *entry; + const struct kvm_vcpu_sbi_extension *ext; + int i; + + for (i =3D 0; i < ARRAY_SIZE(sbi_ext); i++) { + entry =3D &sbi_ext[i]; + ext =3D entry->ext_ptr; + + if (ext->probe && !ext->probe(vcpu)) { + scontext->ext_status[entry->ext_idx] =3D + KVM_RISCV_SBI_EXT_UNAVAILABLE; + continue; + } + + scontext->ext_status[entry->ext_idx] =3D ext->default_unavail ? + KVM_RISCV_SBI_EXT_UNAVAILABLE : + KVM_RISCV_SBI_EXT_AVAILABLE; + } +} --=20 2.34.1 From nobody Tue Dec 16 03:22:43 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 AB637C19F5C for ; Fri, 20 Oct 2023 07:22:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376419AbjJTHWX (ORCPT ); Fri, 20 Oct 2023 03:22:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33720 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376415AbjJTHWQ (ORCPT ); Fri, 20 Oct 2023 03:22:16 -0400 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E42C10CC for ; Fri, 20 Oct 2023 00:22:08 -0700 (PDT) Received: by mail-pf1-x42c.google.com with SMTP id d2e1a72fcca58-6bee11456baso463223b3a.1 for ; Fri, 20 Oct 2023 00:22:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1697786528; x=1698391328; 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=hO8QQxSKIIq22xFRYvu7Gu8eaqjv2hPcSOTMD/z9e94=; b=NF++K+IHtiFmgzrSHLZgrw41LakLY8FUKgQny7rh/tQlqYxqoIAw3AKCFRiZWavtif BMMFkeFZSDxixW4/Yb0ITH9n5zesJUE1Z1JbWE7+0ZUa9LzP7dR7BxshCbs9//6+Rs4U YMotsWDeueiyVfEDFKm1T8pyaltg5uHQG2SN+fxJIWrQSIPkDH1qxonOfwBpU2WK1LUM YOMXwJQhxG6JK0bJPmX7Etl3NMvR52RLmYtSjeE2LPYNaLyqSuqaGtWIEavZ3j3j5VwN rcUiu4zoUjtplmeGYDlwe2Yuh/Cw1kPLDbCKH1PS0yqmRDHsGryReQM+2Vp2wXmLCNBc cRQg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697786528; x=1698391328; 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=hO8QQxSKIIq22xFRYvu7Gu8eaqjv2hPcSOTMD/z9e94=; b=a83/uHoAqh15UoDhs4s0CoIdaDx9lQ1h3pYZ5exjp43ejlyRwbL0oiiYVyyxSgNr3l UNc6sV3unFQ95jhUScdfEcT+kHNoUOZVq83F1XcX+jyfa6aWpwUwr3E+N76FaY0kkX3v KFi535/EHOMOlOboCCEsPgpy9SKToJRFIZeBAQFjZMIyqwlHYNv46VxlXFcUtkuY2xT0 I37qSUhGE0xu1dXrTcJQTQOhgGZ7TuNKV6+0dT5JBnyWNV5mC7oGditTJo1queaZgOlg 122syQMxzU61eBAB8+oB0F+hkK2DDP70yZuv1nPjZKZuJc5kTbw6s9InUjMEyxKBcQ0s BSyA== X-Gm-Message-State: AOJu0YwQrF8T4y4tftEX/1mEIM0+BnoI5HZuvcCc2318kWxM2RK0ImEN OTq5HP9qoBI0EW1O5o/ZNeAhkg== X-Google-Smtp-Source: AGHT+IEkj9caZAnNIJ+YKQHJFuBSd9R4KVCbXPxdNGw5YMPQO4SC5tQtDdGdQxSt48V7VnxE9x8JkQ== X-Received: by 2002:aa7:9622:0:b0:68e:42c9:74e0 with SMTP id r2-20020aa79622000000b0068e42c974e0mr952140pfg.3.1697786528093; Fri, 20 Oct 2023 00:22:08 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([171.76.83.81]) by smtp.gmail.com with ESMTPSA id v12-20020a63f20c000000b005b32d6b4f2fsm828204pgh.81.2023.10.20.00.22.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 00:22:07 -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 v3 4/9] RISC-V: KVM: Forward SBI DBCN extension to user-space Date: Fri, 20 Oct 2023 12:51:35 +0530 Message-Id: <20231020072140.900967-5-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231020072140.900967-1-apatel@ventanamicro.com> References: <20231020072140.900967-1-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 frozen SBI v2.0 specification defines the SBI debug console (DBCN) extension which replaces the legacy SBI v0.1 console functions namely sbi_console_getchar() and sbi_console_putchar(). The SBI DBCN extension needs to be emulated in the KVM user-space (i.e. QEMU-KVM or KVMTOOL) so we forward SBI DBCN calls from KVM guest to the KVM user-space which can then redirect the console input/output to wherever it wants (e.g. telnet, file, stdio, etc). The SBI debug console is simply a early console available to KVM guest for early prints and it does not intend to replace the proper console devices such as 8250, VirtIO console, etc. Signed-off-by: Anup Patel Reviewed-by: Andrew Jones --- 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 | 32 +++++++++++++++++++++++++++ 4 files changed, 38 insertions(+) diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm= /kvm_vcpu_sbi.h index c02bda5559d7..6a453f7f8b56 100644 --- a/arch/riscv/include/asm/kvm_vcpu_sbi.h +++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h @@ -73,6 +73,7 @@ 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 bda8b0b33343..a04ff98085d9 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..23b57c931b15 100644 --- a/arch/riscv/kvm/vcpu_sbi_replace.c +++ b/arch/riscv/kvm/vcpu_sbi_replace.c @@ -175,3 +175,35 @@ 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, + .default_unavail =3D true, + .handler =3D kvm_sbi_ext_dbcn_handler, +}; --=20 2.34.1 From nobody Tue Dec 16 03:22:43 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 014F5C004C0 for ; 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Fri, 20 Oct 2023 00:22:12 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([171.76.83.81]) by smtp.gmail.com with ESMTPSA id v12-20020a63f20c000000b005b32d6b4f2fsm828204pgh.81.2023.10.20.00.22.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 00:22:12 -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 v3 5/9] KVM: riscv: selftests: Add SBI DBCN extension to get-reg-list test Date: Fri, 20 Oct 2023 12:51:36 +0530 Message-Id: <20231020072140.900967-6-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231020072140.900967-1-apatel@ventanamicro.com> References: <20231020072140.900967-1-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" We have a new SBI debug console (DBCN) extension supported by in-kernel KVM so let us add this extension to get-reg-list test. Signed-off-by: Anup Patel Reviewed-by: Andrew Jones --- tools/testing/selftests/kvm/riscv/get-reg-list.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/testing/selftests/kvm/riscv/get-reg-list.c b/tools/testi= ng/selftests/kvm/riscv/get-reg-list.c index 234006d035c9..6bedaea95395 100644 --- a/tools/testing/selftests/kvm/riscv/get-reg-list.c +++ b/tools/testing/selftests/kvm/riscv/get-reg-list.c @@ -394,6 +394,7 @@ static const char *sbi_ext_single_id_to_str(__u64 reg_o= ff) KVM_SBI_EXT_ARR(KVM_RISCV_SBI_EXT_PMU), KVM_SBI_EXT_ARR(KVM_RISCV_SBI_EXT_EXPERIMENTAL), KVM_SBI_EXT_ARR(KVM_RISCV_SBI_EXT_VENDOR), + KVM_SBI_EXT_ARR(KVM_RISCV_SBI_EXT_DBCN), }; =20 if (reg_off >=3D ARRAY_SIZE(kvm_sbi_ext_reg_name)) @@ -567,6 +568,7 @@ static __u64 base_regs[] =3D { KVM_REG_RISCV | KVM_REG_SIZE_ULONG | KVM_REG_RISCV_SBI_EXT | KVM_REG_RISC= V_SBI_SINGLE | KVM_RISCV_SBI_EXT_PMU, KVM_REG_RISCV | KVM_REG_SIZE_ULONG | KVM_REG_RISCV_SBI_EXT | KVM_REG_RISC= V_SBI_SINGLE | KVM_RISCV_SBI_EXT_EXPERIMENTAL, KVM_REG_RISCV | KVM_REG_SIZE_ULONG | KVM_REG_RISCV_SBI_EXT | KVM_REG_RISC= V_SBI_SINGLE | KVM_RISCV_SBI_EXT_VENDOR, + KVM_REG_RISCV | KVM_REG_SIZE_ULONG | KVM_REG_RISCV_SBI_EXT | KVM_REG_RISC= V_SBI_SINGLE | KVM_RISCV_SBI_EXT_DBCN, KVM_REG_RISCV | KVM_REG_SIZE_ULONG | KVM_REG_RISCV_SBI_EXT | KVM_REG_RISC= V_SBI_MULTI_EN | 0, KVM_REG_RISCV | KVM_REG_SIZE_ULONG | KVM_REG_RISCV_SBI_EXT | KVM_REG_RISC= V_SBI_MULTI_DIS | 0, }; 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charset="utf-8" The functions sbi_console_putchar() and sbi_console_getchar() are not defined when CONFIG_RISCV_SBI_V01 is disabled so let us add stub of these functions to avoid "#ifdef" on user side. Signed-off-by: Anup Patel Reviewed-by: Andrew Jones --- arch/riscv/include/asm/sbi.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h index 12dfda6bb924..cbcefa344417 100644 --- a/arch/riscv/include/asm/sbi.h +++ b/arch/riscv/include/asm/sbi.h @@ -271,8 +271,13 @@ struct sbiret sbi_ecall(int ext, int fid, unsigned lon= g arg0, unsigned long arg3, unsigned long arg4, unsigned long arg5); =20 +#ifdef CONFIG_RISCV_SBI_V01 void sbi_console_putchar(int ch); int sbi_console_getchar(void); +#else +static inline void sbi_console_putchar(int ch) { } +static inline int sbi_console_getchar(void) { return -1; } +#endif long sbi_get_mvendorid(void); long sbi_get_marchid(void); long sbi_get_mimpid(void); --=20 2.34.1 From nobody Tue Dec 16 03:22:43 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 75CDEC004C0 for ; Fri, 20 Oct 2023 07:22:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376513AbjJTHWs (ORCPT ); Fri, 20 Oct 2023 03:22:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60212 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376515AbjJTHW3 (ORCPT ); Fri, 20 Oct 2023 03:22:29 -0400 Received: from mail-oi1-x22e.google.com (mail-oi1-x22e.google.com [IPv6:2607:f8b0:4864:20::22e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C9517171F for ; Fri, 20 Oct 2023 00:22:22 -0700 (PDT) Received: by mail-oi1-x22e.google.com with SMTP id 5614622812f47-3b2e4107f47so376703b6e.2 for ; Fri, 20 Oct 2023 00:22:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1697786542; x=1698391342; 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=y40VDpa5tFn1F2iuJCGX0eAdf56bF4H2v7CDU5J7JlM=; b=Y/dSv7M87ohdmZ4awy0HHKLeA+scxM7mt0K3NdBG6B7PFHtFqgnuE5MD8/oAVDJwbP oYhoDehf1vfzRuNR2JBJatfKHKmrs/7Px/ImZpPIYO7q1/2JZI+tHFbFQ8aLcVT4ShOg HdkKk8JMTSOd/kDrEvdPWrTHf/VS0wkP1s9/qX/Dl2mae+8xJ6w2s91cGLE1pzAY/dMN LVTmx5+PGF3DCSSMvqqnSf3CD4TdcDp+8xoB63mSrSiiI5MepK5YpxBWPGXE+SoAsiaQ 1bvuV3UjZHF3/WoE5reUxLbIwjGDgvhEcEQAQ58K3JRfQJueyvr9zfmpJXJlPo6bJcKC /c/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697786542; x=1698391342; 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=y40VDpa5tFn1F2iuJCGX0eAdf56bF4H2v7CDU5J7JlM=; b=TDnf4vzza5jVrKKYUNrChU4LHV4+ZXiDt0/rBfard5dZU75a+e6NHA0DG3ejEiAk93 TFKbxsv1HuTa1pstDhGFx8MglqpBYeo6HEJqPhZJjWm6DaOD71BgofLNUb/D+cxI4qVO alqQFfp1d5p9MB6/Q6Qs/asSIE8aYNJOoMicbtud8ovb/KkHw3ckOe2ZZwP508fRMArw U6q+aWSLcmhW7KTNTJCaL26AvKMmDBITr/6T8qTmyinaKjiCBnH+xyH6bqCg1KrkEU+u oOSt2+qixJcGEDnj7e2D1E/6617mlZPZfvlOgKfek3y9bXlqlHr2LKejwcP98TLV9zAL 30BA== X-Gm-Message-State: AOJu0Yx0s+E3/J6MQydgnxL/bz3Tea7JyzCDDUUcknP2WAs/ivcbn3tp QOD4KUR1XDWkpoE9CjnGGN9Qxg== X-Google-Smtp-Source: AGHT+IEUQYK4G0+aPnRjUR077ELz4RoscN7PlFXPrhd3l1/3Dp5w/UYmiQBCTNoQsdXF4g9TKR4q0g== X-Received: by 2002:a05:6808:55:b0:3af:d7dc:a47e with SMTP id v21-20020a056808005500b003afd7dca47emr1067018oic.42.1697786541699; Fri, 20 Oct 2023 00:22:21 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([171.76.83.81]) by smtp.gmail.com with ESMTPSA id v12-20020a63f20c000000b005b32d6b4f2fsm828204pgh.81.2023.10.20.00.22.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 00:22:21 -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 v3 7/9] tty/serial: Add RISC-V SBI debug console based earlycon Date: Fri, 20 Oct 2023 12:51:38 +0530 Message-Id: <20231020072140.900967-8-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231020072140.900967-1-apatel@ventanamicro.com> References: <20231020072140.900967-1-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" We extend the existing RISC-V SBI earlycon support to use the new RISC-V SBI debug console extension. Signed-off-by: Anup Patel Reviewed-by: Andrew Jones --- drivers/tty/serial/Kconfig | 2 +- drivers/tty/serial/earlycon-riscv-sbi.c | 32 +++++++++++++++++++++---- 2 files changed, 29 insertions(+), 5 deletions(-) diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index bdc568a4ab66..cec46091a716 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -87,7 +87,7 @@ config SERIAL_EARLYCON_SEMIHOST =20 config SERIAL_EARLYCON_RISCV_SBI bool "Early console using RISC-V SBI" - depends on RISCV_SBI_V01 + depends on RISCV_SBI select SERIAL_CORE select SERIAL_CORE_CONSOLE select SERIAL_EARLYCON diff --git a/drivers/tty/serial/earlycon-riscv-sbi.c b/drivers/tty/serial/e= arlycon-riscv-sbi.c index 27afb0b74ea7..c21cdef254e7 100644 --- a/drivers/tty/serial/earlycon-riscv-sbi.c +++ b/drivers/tty/serial/earlycon-riscv-sbi.c @@ -15,17 +15,41 @@ static void sbi_putc(struct uart_port *port, unsigned c= har c) sbi_console_putchar(c); } =20 -static void sbi_console_write(struct console *con, - const char *s, unsigned n) +static void sbi_0_1_console_write(struct console *con, + const char *s, unsigned int n) { struct earlycon_device *dev =3D con->data; uart_console_write(&dev->port, s, n, sbi_putc); } =20 +static void sbi_dbcn_console_write(struct console *con, + const char *s, unsigned int n) +{ + phys_addr_t pa =3D __pa(s); + + if (IS_ENABLED(CONFIG_32BIT)) + sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE, + n, lower_32_bits(pa), upper_32_bits(pa), 0, 0, 0); + else + sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE, + n, pa, 0, 0, 0, 0); +} + static int __init early_sbi_setup(struct earlycon_device *device, const char *opt) { - device->con->write =3D sbi_console_write; - return 0; + int ret =3D 0; + + if ((sbi_spec_version >=3D sbi_mk_version(2, 0)) && + (sbi_probe_extension(SBI_EXT_DBCN) > 0)) { + device->con->write =3D sbi_dbcn_console_write; + } else { + if (IS_ENABLED(CONFIG_RISCV_SBI_V01)) + device->con->write =3D sbi_0_1_console_write; + else + ret =3D -ENODEV; + } + + return ret; } EARLYCON_DECLARE(sbi, early_sbi_setup); --=20 2.34.1 From nobody Tue Dec 16 03:22:43 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 E38FDCDB47E for ; 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Fri, 20 Oct 2023 00:22:26 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([171.76.83.81]) by smtp.gmail.com with ESMTPSA id v12-20020a63f20c000000b005b32d6b4f2fsm828204pgh.81.2023.10.20.00.22.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 00:22:25 -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, Atish Patra , Anup Patel Subject: [PATCH v3 8/9] tty: Add SBI debug console support to HVC SBI driver Date: Fri, 20 Oct 2023 12:51:39 +0530 Message-Id: <20231020072140.900967-9-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231020072140.900967-1-apatel@ventanamicro.com> References: <20231020072140.900967-1-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" From: Atish Patra RISC-V SBI specification supports advanced debug console support via SBI DBCN extension. Extend the HVC SBI driver to support it. Signed-off-by: Atish Patra Signed-off-by: Anup Patel --- drivers/tty/hvc/Kconfig | 2 +- drivers/tty/hvc/hvc_riscv_sbi.c | 82 ++++++++++++++++++++++++++++++--- 2 files changed, 76 insertions(+), 8 deletions(-) diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig index 4f9264d005c0..6e05c5c7bca1 100644 --- a/drivers/tty/hvc/Kconfig +++ b/drivers/tty/hvc/Kconfig @@ -108,7 +108,7 @@ config HVC_DCC_SERIALIZE_SMP =20 config HVC_RISCV_SBI bool "RISC-V SBI console support" - depends on RISCV_SBI_V01 + depends on RISCV_SBI select HVC_DRIVER help This enables support for console output via RISC-V SBI calls, which diff --git a/drivers/tty/hvc/hvc_riscv_sbi.c b/drivers/tty/hvc/hvc_riscv_sb= i.c index 31f53fa77e4a..56da1a4b5aca 100644 --- a/drivers/tty/hvc/hvc_riscv_sbi.c +++ b/drivers/tty/hvc/hvc_riscv_sbi.c @@ -39,21 +39,89 @@ static int hvc_sbi_tty_get(uint32_t vtermno, char *buf,= int count) return i; } =20 -static const struct hv_ops hvc_sbi_ops =3D { +static const struct hv_ops hvc_sbi_v01_ops =3D { .get_chars =3D hvc_sbi_tty_get, .put_chars =3D hvc_sbi_tty_put, }; =20 -static int __init hvc_sbi_init(void) +static int hvc_sbi_dbcn_tty_put(uint32_t vtermno, const char *buf, int cou= nt) { - return PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_ops, 16)); + phys_addr_t pa; + struct sbiret ret; + + if (is_vmalloc_addr(buf)) { + pa =3D page_to_phys(vmalloc_to_page(buf)) + offset_in_page(buf); + if (PAGE_SIZE < (offset_in_page(buf) + count)) + count =3D PAGE_SIZE - offset_in_page(buf); + } else { + pa =3D __pa(buf); + } + + if (IS_ENABLED(CONFIG_32BIT)) + ret =3D sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE, + count, lower_32_bits(pa), upper_32_bits(pa), + 0, 0, 0); + else + ret =3D sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE, + count, pa, 0, 0, 0, 0); + if (ret.error) + return 0; + + return count; } -device_initcall(hvc_sbi_init); =20 -static int __init hvc_sbi_console_init(void) +static int hvc_sbi_dbcn_tty_get(uint32_t vtermno, char *buf, int count) { - hvc_instantiate(0, 0, &hvc_sbi_ops); + phys_addr_t pa; + struct sbiret ret; + + if (is_vmalloc_addr(buf)) { + pa =3D page_to_phys(vmalloc_to_page(buf)) + offset_in_page(buf); + if (PAGE_SIZE < (offset_in_page(buf) + count)) + count =3D PAGE_SIZE - offset_in_page(buf); + } else { + pa =3D __pa(buf); + } + + if (IS_ENABLED(CONFIG_32BIT)) + ret =3D sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_READ, + count, lower_32_bits(pa), upper_32_bits(pa), + 0, 0, 0); + else + ret =3D sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_READ, + count, pa, 0, 0, 0, 0); + if (ret.error) + return 0; + + return ret.value; +} + +static const struct hv_ops hvc_sbi_dbcn_ops =3D { + .put_chars =3D hvc_sbi_dbcn_tty_put, + .get_chars =3D hvc_sbi_dbcn_tty_get, +}; + +static int __init hvc_sbi_init(void) +{ + int err; + + if ((sbi_spec_version >=3D sbi_mk_version(2, 0)) && + (sbi_probe_extension(SBI_EXT_DBCN) > 0)) { + err =3D PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_dbcn_ops, 16)); + if (err) + return err; + hvc_instantiate(0, 0, &hvc_sbi_dbcn_ops); + } else { + if (IS_ENABLED(CONFIG_RISCV_SBI_V01)) { + err =3D PTR_ERR_OR_ZERO(hvc_alloc(0, 0, &hvc_sbi_v01_ops, 16)); + if (err) + return err; + hvc_instantiate(0, 0, &hvc_sbi_v01_ops); + } else { + return -ENODEV; + } + } =20 return 0; } -console_initcall(hvc_sbi_console_init); +device_initcall(hvc_sbi_init); --=20 2.34.1 From nobody Tue Dec 16 03:22:43 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 9E978CDB474 for ; Fri, 20 Oct 2023 07:23:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376480AbjJTHXP (ORCPT ); Fri, 20 Oct 2023 03:23:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42206 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376499AbjJTHWp (ORCPT ); Fri, 20 Oct 2023 03:22:45 -0400 Received: from mail-oo1-xc2e.google.com (mail-oo1-xc2e.google.com [IPv6:2607:f8b0:4864:20::c2e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AA22C199A for ; 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Fri, 20 Oct 2023 00:22:30 -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 v3 9/9] RISC-V: Enable SBI based earlycon support Date: Fri, 20 Oct 2023 12:51:40 +0530 Message-Id: <20231020072140.900967-10-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231020072140.900967-1-apatel@ventanamicro.com> References: <20231020072140.900967-1-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" Let us enable SBI based earlycon support in defconfigs for both RV32 and RV64 so that "earlycon=3Dsbi" can be used again. Signed-off-by: Anup Patel Reviewed-by: Andrew Jones --- arch/riscv/configs/defconfig | 1 + arch/riscv/configs/rv32_defconfig | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig index ab86ec3b9eab..f82700da0056 100644 --- a/arch/riscv/configs/defconfig +++ b/arch/riscv/configs/defconfig @@ -132,6 +132,7 @@ CONFIG_SERIAL_8250_CONSOLE=3Dy CONFIG_SERIAL_8250_DW=3Dy CONFIG_SERIAL_OF_PLATFORM=3Dy CONFIG_SERIAL_SH_SCI=3Dy +CONFIG_SERIAL_EARLYCON_RISCV_SBI=3Dy CONFIG_VIRTIO_CONSOLE=3Dy CONFIG_HW_RANDOM=3Dy CONFIG_HW_RANDOM_VIRTIO=3Dy diff --git a/arch/riscv/configs/rv32_defconfig b/arch/riscv/configs/rv32_de= fconfig index 89b601e253a6..5721af39afd1 100644 --- a/arch/riscv/configs/rv32_defconfig +++ b/arch/riscv/configs/rv32_defconfig @@ -66,6 +66,7 @@ CONFIG_INPUT_MOUSEDEV=3Dy CONFIG_SERIAL_8250=3Dy CONFIG_SERIAL_8250_CONSOLE=3Dy CONFIG_SERIAL_OF_PLATFORM=3Dy +CONFIG_SERIAL_EARLYCON_RISCV_SBI=3Dy CONFIG_VIRTIO_CONSOLE=3Dy CONFIG_HW_RANDOM=3Dy CONFIG_HW_RANDOM_VIRTIO=3Dy --=20 2.34.1