From patchwork Fri Oct 20 07:21:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anup Patel X-Patchwork-Id: 13430161 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 2F948CDB474 for ; Fri, 20 Oct 2023 07:21:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376400AbjJTHVx (ORCPT ); Fri, 20 Oct 2023 03:21:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41622 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235626AbjJTHVw (ORCPT ); Fri, 20 Oct 2023 03:21:52 -0400 Received: from mail-ot1-x32a.google.com (mail-ot1-x32a.google.com [IPv6:2607:f8b0:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A73601AE for ; Fri, 20 Oct 2023 00:21:50 -0700 (PDT) Received: by mail-ot1-x32a.google.com with SMTP id 46e09a7af769-6ce37d0f1a9so158996a34.0 for ; Fri, 20 Oct 2023 00:21:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1697786510; x=1698391310; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=vbaUx5tgc13C+fDPGJz++EpIqc5R/EjgaTQRdQ/gzH0=; b=IQJxLwRnkVJswQiTcQ3xGR/+3EunbGluullE4WmjRR1F3aiazKBSlwTp3x6/MDhojj 7wgvd9gAOfUGEbtRVNUKCD/tVmzRyeN3gpaJJTGSrwZWs9qZtz2mk3tM7NmJGVxAOGi1 gRHv/MxPhOODdRGWEMk0c4RB/uOVuX6+tc5lJ64YK7NANRncHXaezJ34/1M4iFHI0dSd syTMDZgoJhnJ+pWmDd0bz0aQGF/ArsTDkXb0QZGr7oKjhK89aZP3sxZ7BoD7ZIPmj4oY ZdsaU5zldRjJhSOCPJnNH8pYLrJV5ji6LcsVv7t9sVfhQkYwjTfrIGqkurVDAnomQ8+m q2sA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697786510; x=1698391310; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=vbaUx5tgc13C+fDPGJz++EpIqc5R/EjgaTQRdQ/gzH0=; b=fu1HbtOUM7oXNMsO/ZgRK6uC7lp3y9XicIwF0oNh018R7Tl5pTFvgn6Dkz0SFkwzvK IoC9qBvqEYHz3Nj47rLBElv9HgAmvkyqCWyv9KEc779Bn4ck2JnAZWY3yPya1h3xH/Ls WS1qAW165I0bp4BiKAeNK6bntLGCbX59apmT8xuFuvl7wBBM4YmI7uuLKtVC7uoRFD9j 9tMPDQvuDjZnev77Gm2Bzq8DyqAeAQO9AIVRjgjIQ9ERpzRVxyYYqCs3C/0sBmGjg0/f lbwQOsTb+n7lCs1fzmsyqsGyTxORDOt1XjEpH9qfS8Xl5ffs8bWKKjgVTqilqVvrcIc/ Amaw== X-Gm-Message-State: AOJu0YwfnJ4Fu1G6lIg7iwNWzNLjRiLpiWShRw8/44cODbOdBEdNnQGz QucrvrrV9/biSuaLoW1WBfKbbQ== X-Google-Smtp-Source: AGHT+IGd8XOYNX5Cl6NNnHjukDwjUbSrOdVya8xac9O1HehPftFC2/Zt55vtSezxHy+OiVL/3DWrYQ== X-Received: by 2002:a05:6358:5927:b0:168:a3b2:945a with SMTP id g39-20020a056358592700b00168a3b2945amr1087904rwf.0.1697786509722; Fri, 20 Oct 2023 00:21:49 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([171.76.83.81]) by smtp.gmail.com with ESMTPSA id v12-20020a63f20c000000b005b32d6b4f2fsm828204pgh.81.2023.10.20.00.21.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Oct 2023 00:21:49 -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 0/9] RISC-V SBI debug console extension support Date: Fri, 20 Oct 2023 12:51:31 +0530 Message-Id: <20231020072140.900967-1-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The SBI v2.0 specification is now frozen. The SBI v2.0 specification defines SBI debug console (DBCN) extension which replaces the legacy SBI v0.1 functions sbi_console_putchar() and sbi_console_getchar(). (Refer v2.0-rc5 at https://github.com/riscv-non-isa/riscv-sbi-doc/releases) This series adds support for SBI debug console (DBCN) extension in KVM RISC-V and Linux RISC-V. To try these patches with KVM RISC-V, use KVMTOOL from riscv_sbi_dbcn_v1 branch at: https://github.com/avpatel/kvmtool.git These patches can also be found in the riscv_sbi_dbcn_v3 branch at: https://github.com/avpatel/linux.git Changes since v2: - Rebased on Linux-6.6-rc5 - Handled page-crossing in PATCH7 of v2 series - Addressed Drew's comment in PATCH3 of v2 series - Added new PATCH5 to make get-reg-list test aware of SBI DBCN extension Changes since v1: - Remove use of #ifdef from PATCH4 and PATCH5 of the v1 series - Improved commit description of PATCH3 in v1 series - Introduced new PATCH3 in this series to allow some SBI extensions (such as SBI DBCN) do to disabled by default so that older KVM user space work fine and newer KVM user space have to explicitly opt-in for emulating SBI DBCN. - Introduced new PATCH5 in this series which adds inline version of sbi_console_getchar() and sbi_console_putchar() for the case where CONFIG_RISCV_SBI_V01 is disabled. Anup Patel (8): RISC-V: Add defines for SBI debug console extension RISC-V: KVM: Change the SBI specification version to v2.0 RISC-V: KVM: Allow some SBI extensions to be disabled by default RISC-V: KVM: Forward SBI DBCN extension to user-space KVM: riscv: selftests: Add SBI DBCN extension to get-reg-list test RISC-V: Add stubs for sbi_console_putchar/getchar() tty/serial: Add RISC-V SBI debug console based earlycon RISC-V: Enable SBI based earlycon support Atish Patra (1): tty: Add SBI debug console support to HVC SBI driver arch/riscv/configs/defconfig | 1 + arch/riscv/configs/rv32_defconfig | 1 + arch/riscv/include/asm/kvm_vcpu_sbi.h | 7 +- arch/riscv/include/asm/sbi.h | 12 +++ arch/riscv/include/uapi/asm/kvm.h | 1 + arch/riscv/kvm/vcpu.c | 6 ++ arch/riscv/kvm/vcpu_sbi.c | 61 +++++++------- arch/riscv/kvm/vcpu_sbi_replace.c | 32 ++++++++ drivers/tty/hvc/Kconfig | 2 +- drivers/tty/hvc/hvc_riscv_sbi.c | 82 +++++++++++++++++-- drivers/tty/serial/Kconfig | 2 +- drivers/tty/serial/earlycon-riscv-sbi.c | 32 +++++++- .../selftests/kvm/riscv/get-reg-list.c | 2 + 13 files changed, 198 insertions(+), 43 deletions(-)