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[109.243.71.38]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-647510508e1sm12104724a12.27.2025.12.01.02.24.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Dec 2025 02:24:19 -0800 (PST) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: e6704ee7-ce9f-11f0-9d19-b5c5bf9af7f9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1764584660; x=1765189460; darn=lists.xenproject.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=lf+N5X3ZZ5bsc0bBTkOsHsGSk6FHfGVMZrI5qCr7EEo=; b=Nz1lIuNWZ23GQzNT7uPS2A4nWBLgSYss4y63rNkQNbIZfJaP/TugtdiEDZw7FAR2wI kL6MS9F4SixHugsD+k09TDJeljwIBnzDUxVL+dfsEPVAdmMcDqMhH7wjIgCdzQg4ILir VuT3at7qQJEWm1R0wxzjB/uGeca/+gzsYmFbH0D69vwImwpo02g5BNbqT0d3bbHVp1em 1BPTOUprAxYyboY7fIyKdvFyjp55YoX2LScgAkednHqkSYTQLeVEvMA3cgumSEHIU2Yg T8xBrDoMlFxwmtxOJtGL+3kzCTRI9getG03dNavNCJzoatTwvvFa/jrYXhdvalt2Tit6 V2sQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764584660; x=1765189460; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=lf+N5X3ZZ5bsc0bBTkOsHsGSk6FHfGVMZrI5qCr7EEo=; b=jIvMyYZmdin1jz1rBSO/iWK+zMxxTBMgQdsU0e03WJ4Je0XwMhtUKsVdPIS/M61CNP TrMsC9nWQ7j/qc/vKzCsZyflxaMjorkmardVSthNMFLMD/fIXZxcUrsxNyDuFL/50FZL mMkYjK+NbhABxYQ/alvD4bScNBCUoiHHPj4mWROuEOPKcNeBbW+xoqmRwpkfQ9JErRU9 d/mHEEAayJBcfwV6VegrmLpPTwkAv52rZqLvkbCVXWHN1rV7krtbbbGXfX/Smi1mhskd XyUbs+o2hx+faPnD0wCzlx5cPT519w4hcQ9qbd37GmMsmWvK7mazo1PePqvgQzpCSW2S mMfA== X-Gm-Message-State: AOJu0YxOkp5JPr29spwSbCRECsgTjgVyx9wA/H2Eo7JpncWyq0a8EuFc utD6Ag8hQkcFxlJR3lpTAtXhyNooiBRq6KQIzv/VzIBjItj4jOqHsra67jaidIpc X-Gm-Gg: ASbGnctz1xabEtIGqo5m8/kNhRT2CeQnCINUrxAjJkZwA0xo9kde1+rRuzDdSfO3jbM n65pOGP1sNaNeYzfoIGsnuvNPzmOgE/sW/GaaA2E81nl47rRrKHeJJvmzKU2XRAcGHPJgfBYQ79 5ec/gZjA72bSlhtzwb2WWqW1mwzUrvPBaS/MRyEnZulwRKqUgZg8asec69dnEuet1s2VFdxL5z+ BkZwkM+9lSBPuLqn7fS+CrXmLX9ORWm0am6YllmOSAcXvyV1dQvt4SIQ2QhwTklLRLRXPU6AAaV JsnKLuJYm8kfrPN62Tk98bnRImAGrpul1F/cZR8qToIKGs34KrZbIby2/WcbYpmXbLAbrUDNoHd Y6Xf9XR7uKQlHWEN/jAYdJ+pthmN+5s28wyUAd6yltQMo1hJmwqPy8miqHhvgEadJSq5wIU9wh6 v8rVAg/U84yweCTpJq8KAc+SPF8MRiHr9zUPjx+9TJCbvcYrP0MXPxoKX6ICiH3xSTkA== X-Google-Smtp-Source: AGHT+IESPE5BRtDHOM0mPf44z/DvKR1KHQLIzguXTRd2Az3sSheaMmSW8ev4MCk0ZNllhessoEZqYw== X-Received: by 2002:a05:6402:42c7:b0:640:e791:df67 with SMTP id 4fb4d7f45d1cf-64555b9bebbmr36232781a12.10.1764584660077; Mon, 01 Dec 2025 02:24:20 -0800 (PST) From: Oleksii Kurochko To: xen-devel@lists.xenproject.org Cc: Oleksii Kurochko , Alistair Francis , Bob Eshleman , Connor Davis , Andrew Cooper , Anthony PERARD , Michal Orzel , Jan Beulich , Julien Grall , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Stefano Stabellini Subject: [PATCH v1 2/3] xen/riscv: add RISC-V legacy SBI extension support for guests Date: Mon, 1 Dec 2025 11:24:09 +0100 Message-ID: X-Mailer: git-send-email 2.52.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1764584697138019200 Content-Type: text/plain; charset="utf-8" This commit adds support for legacy SBI extensions (version 0.1) in Xen for guest domains. The changes include: 1. Define all legacy SBI extension IDs (0x0 to 0x8) for better clarity and completeness. 2. Implement handling of legacy SBI extensions, starting with support for SBI_EXT_0_1_CONSOLE_{PUT,GET}CHAR. The implementation uses the existing virtual SBI framework to handle legacy SBI ecalls, ensuring compatibility with older SBI specifications in RISC-V guests. Signed-off-by: Oleksii Kurochko --- xen/arch/riscv/include/asm/sbi.h | 11 ++++-- xen/arch/riscv/vsbi/Makefile | 1 + xen/arch/riscv/vsbi/vsbi-legacy-extension.c | 37 +++++++++++++++++++++ 3 files changed, 47 insertions(+), 2 deletions(-) create mode 100644 xen/arch/riscv/vsbi/vsbi-legacy-extension.c diff --git a/xen/arch/riscv/include/asm/sbi.h b/xen/arch/riscv/include/asm/= sbi.h index ade24a572d..e7d5d707b1 100644 --- a/xen/arch/riscv/include/asm/sbi.h +++ b/xen/arch/riscv/include/asm/sbi.h @@ -14,8 +14,15 @@ =20 #include =20 -#define SBI_EXT_0_1_CONSOLE_PUTCHAR 0x1 -#define SBI_EXT_0_1_SHUTDOWN 0x8 +#define SBI_EXT_0_1_SET_TIMER 0x0 +#define SBI_EXT_0_1_CONSOLE_PUTCHAR 0x1 +#define SBI_EXT_0_1_CONSOLE_GETCHAR 0x2 +#define SBI_EXT_0_1_CLEAR_IPI 0x3 +#define SBI_EXT_0_1_SEND_IPI 0x4 +#define SBI_EXT_0_1_REMOTE_FENCE_I 0x5 +#define SBI_EXT_0_1_REMOTE_SFENCE_VMA 0x6 +#define SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID 0x7 +#define SBI_EXT_0_1_SHUTDOWN 0x8 =20 #define SBI_EXT_BASE 0x10 #define SBI_EXT_RFENCE 0x52464E43 diff --git a/xen/arch/riscv/vsbi/Makefile b/xen/arch/riscv/vsbi/Makefile index 574c8ff78d..4da625db9a 100644 --- a/xen/arch/riscv/vsbi/Makefile +++ b/xen/arch/riscv/vsbi/Makefile @@ -1 +1,2 @@ obj-y +=3D vsbi.o +obj-y +=3D vsbi-legacy-extension.o diff --git a/xen/arch/riscv/vsbi/vsbi-legacy-extension.c b/xen/arch/riscv/v= sbi/vsbi-legacy-extension.c new file mode 100644 index 0000000000..39d65931b1 --- /dev/null +++ b/xen/arch/riscv/vsbi/vsbi-legacy-extension.c @@ -0,0 +1,37 @@ + +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include +#include + +#include +#include + +static int vsbi_legacy_ecall_handler(struct vcpu *vcpu, unsigned long eid, + unsigned long fid, + struct cpu_user_regs *regs) +{ + int ret =3D 0; + + switch ( eid ) + { + case SBI_EXT_0_1_CONSOLE_PUTCHAR: + printk("%c", (char)regs->a0); + break; + + case SBI_EXT_0_1_CONSOLE_GETCHAR: + regs->a0 =3D SBI_ERR_NOT_SUPPORTED; + break; + + default: + panic("%s: Unsupported ecall: FID: #%lx, EID: #%lx\n", + __func__, fid, eid); + break; + } + + return ret; +} + +VSBI_EXT_START(legacy, SBI_EXT_0_1_SET_TIMER, SBI_EXT_0_1_SHUTDOWN, + vsbi_legacy_ecall_handler) +VSBI_EXT_END --=20 2.52.0