From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 6CBA928F7; Fri, 27 Jan 2023 11:30:54 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id ED163175A; Fri, 27 Jan 2023 03:31:35 -0800 (PST) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.35.16]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DA7843F64C; Fri, 27 Jan 2023 03:30:51 -0800 (PST) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev Subject: [RFC PATCH 28/28] HACK: Accept prototype RMI versions Date: Fri, 27 Jan 2023 11:29:32 +0000 Message-Id: <20230127112932.38045-29-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230127112932.38045-1-steven.price@arm.com> References: <20230127112248.136810-1-suzuki.poulose@arm.com> <20230127112932.38045-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The upstream RMM currently advertises the major version of an internal prototype (v56.0) rather than the expected version from the RMM architecture specification (v1.0). Add a config option to enable support for the prototype RMI v56.0. Signed-off-by: Steven Price --- arch/arm64/include/asm/rmi_smc.h | 7 +++++++ arch/arm64/kvm/Kconfig | 8 ++++++++ arch/arm64/kvm/rme.c | 8 ++++++++ 3 files changed, 23 insertions(+) diff --git a/arch/arm64/include/asm/rmi_smc.h b/arch/arm64/include/asm/rmi_smc.h index 16ff65090f3a..d6bbd7d92b8f 100644 --- a/arch/arm64/include/asm/rmi_smc.h +++ b/arch/arm64/include/asm/rmi_smc.h @@ -6,6 +6,13 @@ #ifndef __ASM_RME_SMC_H #define __ASM_RME_SMC_H +#ifdef CONFIG_RME_USE_PROTOTYPE_HACKS + +// Allow the prototype RMI version +#define PROTOTYPE_RMI_ABI_MAJOR_VERSION 56 + +#endif /* CONFIG_RME_USE_PROTOTYPE_HACKS */ + #include #define SMC_RxI_CALL(func) \ diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index 05da3c8f7e88..13858a5047fd 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -58,6 +58,14 @@ config NVHE_EL2_DEBUG If unsure, say N. +config RME_USE_PROTOTYPE_HACKS + bool "Allow RMM prototype version numbers" + default y + help + For compatibility with the the current RMM code allow versions + numbers from a prototype implementation as well as the expected + version number from the RMM specification. + config PROTECTED_NVHE_STACKTRACE bool "Protected KVM hypervisor stacktraces" depends on NVHE_EL2_DEBUG diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c index 1eb76cbee267..894060635226 100644 --- a/arch/arm64/kvm/rme.c +++ b/arch/arm64/kvm/rme.c @@ -67,6 +67,14 @@ static int rmi_check_version(void) version_major = RMI_ABI_VERSION_GET_MAJOR(res.a0); version_minor = RMI_ABI_VERSION_GET_MINOR(res.a0); +#ifdef PROTOTYPE_RMI_ABI_MAJOR_VERSION + // Support the prototype + if (version_major == PROTOTYPE_RMI_ABI_MAJOR_VERSION) { + kvm_err("Using prototype RMM support (version %d.%d)\n", + version_major, version_minor); + return 0; + } +#endif if (version_major != RMI_ABI_MAJOR_VERSION) { kvm_err("Unsupported RMI ABI (version %d.%d) we support %d\n", version_major, version_minor, -- 2.34.1