From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 12C31CDE000 for ; Thu, 25 Jun 2026 17:35:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=NzRxQvPwzEBTlATkVCaj62V6KcKKHvmr0KtL0Tzs39U=; b=tkueGRSNhuLBIjWnTu89QlRxrV HfgBpjTqD8FOxn4bpavdpDFWFB0PCOvzW0Bd0U24ReyBNWEA6FxHOnKMn5m26BkmJzo2aYChyjRRX SGQC9qH003DdGbhHJwBPo9NsGkgDb3exg5GQoO+tyeyv8RBitPrJLBG0s6Lw6PNbaFAgjcq4Q3D9J oKm7Y+KG6Soi99BzEeDaM1f7p+tKY5qBjBehiZMhl7h3juE86KfFw5z5OfXaayKk0TAyIxx/sfdnr PRf/8gZcPbeN4oniGW36z84zSgBe5s4ryx1yRlM5pQySM0XRzdwgKMcTgVP+a9jOpmFiR1WwyH3Ei CoSSCZ5A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wcnyz-00000009YWv-23fU; Thu, 25 Jun 2026 17:35:21 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wcnyl-00000009YK7-3nK0 for linux-arm-kernel@lists.infradead.org; Thu, 25 Jun 2026 17:35:16 +0000 Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id 2C48220B7169; Thu, 25 Jun 2026 10:35:01 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 2C48220B7169 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1782408901; bh=NzRxQvPwzEBTlATkVCaj62V6KcKKHvmr0KtL0Tzs39U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YyT1mLLbG0yDsWb+ub3RqfqfkOHlZeXiolq/hbqF4YXDOeLmdiv93ZqnEhoqm8oOP XS+ZvAjiK7CZ5GDZPChpxbpbNigkPBEjcAxUtCiu7/RZxgVPYgUuSrUkeESXy1U/JM z4XaicX08QbR1i7BFUkeqYb2msShZhvkDonjy6jk= From: Kameron Carr To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com Cc: catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, lpieralisi@kernel.org, sudeep.holla@kernel.org, arnd@arndb.de, thuth@redhat.com, linux-hyperv@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, mhklinux@outlook.com Subject: [PATCH v2 1/6] arm64: rsi: Add RSI host call structure and helper function Date: Thu, 25 Jun 2026 10:34:55 -0700 Message-ID: <20260625173500.1995481-2-kameroncarr@linux.microsoft.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20260625173500.1995481-1-kameroncarr@linux.microsoft.com> References: <20260625173500.1995481-1-kameroncarr@linux.microsoft.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260625_103507_985846_226DA674 X-CRM114-Status: GOOD ( 11.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add struct rsi_host_call to rsi_smc.h, which represents the host call data structure used by the Realm Management Monitor (RMM) for the RSI_HOST_CALL interface. The structure contains a 16-bit immediate field and 31 general-purpose register values, aligned to 256 bytes as required by the CCA RMM specification. Add rsi_host_call() static inline wrapper in rsi_cmds.h that invokes SMC_RSI_HOST_CALL with the physical address of the host call structure. This will be used by Hyper-V guest code to route hypercalls through the RSI interface when running inside an Arm CCA Realm. Signed-off-by: Kameron Carr --- arch/arm64/include/asm/rsi_cmds.h | 22 ++++++++++++++++++++++ arch/arm64/include/asm/rsi_smc.h | 7 +++++++ 2 files changed, 29 insertions(+) diff --git a/arch/arm64/include/asm/rsi_cmds.h b/arch/arm64/include/asm/rsi_cmds.h index 2c8763876dfb7..9daf8008e5da2 100644 --- a/arch/arm64/include/asm/rsi_cmds.h +++ b/arch/arm64/include/asm/rsi_cmds.h @@ -88,6 +88,28 @@ static inline long rsi_set_addr_range_state(phys_addr_t start, return res.a0; } +/** + * rsi_host_call - Make a Host call. + * @host_call_struct: IPA of host call structure + * + * This call will fail if the IPA of the host call structure: + * * is not aligned to 256 bytes, + * * is not protected / encrypted, + * * is RIPAS_EMPTY + * + * Returns: + * On success, returns RSI_SUCCESS. + * Otherwise, returns an error code. + */ +static inline unsigned long rsi_host_call(phys_addr_t host_call_struct) +{ + struct arm_smccc_res res; + + arm_smccc_smc(SMC_RSI_HOST_CALL, host_call_struct, 0, 0, 0, 0, 0, 0, + &res); + return res.a0; +} + /** * rsi_attestation_token_init - Initialise the operation to retrieve an * attestation token. diff --git a/arch/arm64/include/asm/rsi_smc.h b/arch/arm64/include/asm/rsi_smc.h index e19253f96c940..9cc57b5be0c02 100644 --- a/arch/arm64/include/asm/rsi_smc.h +++ b/arch/arm64/include/asm/rsi_smc.h @@ -142,6 +142,13 @@ struct realm_config { */ } __aligned(0x1000); +struct rsi_host_call { + u16 immediate; + u8 _padding[6]; + u64 gprs[31]; +} __aligned(256); +static_assert(sizeof(struct rsi_host_call) == 256); + #endif /* __ASSEMBLER__ */ /* -- 2.45.4