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 506D2CA5FCE for ; Thu, 1 Oct 2026 22:07:18 +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=kounR2NvS1pQIrMzyt0I8Qr2BJw+HYNfAJfuEFrUQ4k=; b=2DXamaqMYUuSsDDWo2UQU69c/W 5G2sXn7nlG4zbp3L0aLhQXT74pv8HGRAn/g+NqucwRxKuXfGFwb9XKs3NSAS1J05ZUoxLlBXzo5Ta PKqxO0vRPteFrNQJvtEP4u8h81bNhcEVsl5R7rTaWgnrHlv5Hi8Z1mrd4xnsq6V/5dxsR9i1f8Niu bH4mXMXo7RkNSIP8mp3cxHKcwQXjEOHk/1aee8LVmYmmFlU0zJ52vSb3zAt0VAF4T9SKuGbltOV1B GznlY+Vy3wjrdCatnw6OHhUhv9kIJji/awfQde+tOyvt8mHgjPjIZVRKTLfwa1xA9mmEIXVtwkQya u4v1oP5A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCOvf-0000000AK7Q-0FbZ; Thu, 01 Oct 2026 22:07:03 +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 1xCOvd-0000000AK5S-0nMI for linux-arm-kernel@lists.infradead.org; Thu, 01 Oct 2026 22:07:02 +0000 Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id 3895420B7167; Thu, 1 Oct 2026 15:06:06 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 3895420B7167 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1790892366; bh=kounR2NvS1pQIrMzyt0I8Qr2BJw+HYNfAJfuEFrUQ4k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ChqNBTlTncCwcbbdyyrVHLxoSK4INeVRFAe5fmtVskdpsRthSP4TSc89kB7gb+JE8 uyxMg6ac3a2HzeNBgv3Pg7JLErASCqzjfwnwvAz5kWCuYnoFLaxRNho2Fp1HdKCNxv /zJLKTM3dHCBeXyPXgA2zIyF1zS5trAGk9cbzOtQ= From: Kameron Carr To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, mhklinux@outlook.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 Subject: [PATCH v4 1/6] arm64: rsi: Add RSI host call structure and helper function Date: Thu, 1 Oct 2026 15:05:47 -0700 Message-ID: <20261001220552.1793471-2-kameroncarr@linux.microsoft.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20261001220552.1793471-1-kameroncarr@linux.microsoft.com> References: <20261001220552.1793471-1-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-20261001_150701_260788_FF280231 X-CRM114-Status: GOOD ( 11.44 ) 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. Reviewed-by: Michael Kelley Signed-off-by: Kameron Carr --- include/linux/arm-rsi-cmds.h | 22 ++++++++++++++++++++++ include/linux/arm-smccc-rsi.h | 7 +++++++ 2 files changed, 29 insertions(+) diff --git a/include/linux/arm-rsi-cmds.h b/include/linux/arm-rsi-cmds.h index 3f7a6a8..01d292e 100644 --- a/include/linux/arm-rsi-cmds.h +++ b/include/linux/arm-rsi-cmds.h @@ -236,4 +236,26 @@ static inline unsigned long rsi_attestation_token_continue(phys_addr_t granule, 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; +} + #endif /* __LINUX_ARM_RSI_CMDS_H_ */ diff --git a/include/linux/arm-smccc-rsi.h b/include/linux/arm-smccc-rsi.h index fddb779..4c8530b 100644 --- a/include/linux/arm-smccc-rsi.h +++ b/include/linux/arm-smccc-rsi.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