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 DE3F6C55179 for ; Mon, 3 Aug 2026 13:47:12 +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=aqhIxGQtMExXNTQX0y9RZGnMf0VNsSaZBvYsZEL36OU=; b=HM417Dm89VrD2WBNPp4ZfzLwdJ INXOhRfjOCJ6pqc+xIzhsDAhDcySbug9+gy0QAottvbratJOq+0ItlpG9G2toA5iHTkotFA2RYRJg 98GZ4JInL1CnFU1bMZm4fQ60lIy9OSbqSO877SzWDDKT1ip1rmjMV2uWnvEAQ30qFrpN1mfQbBJX/ t/x0hrXUCOMLrnZ44pNP/OXtuWns2zg4oMpsOqzzXAqunFKxshH/N/esEs7yFCei9XSriBtishHnu 8TC2fV490jVDrRF+61BpgSNk3PnuPs3XCaidcHqabCwyNs6Nu0rRtd6RgTFTZw9MdpBF2xGR+yOBf A7sOicHQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wqt0U-0000000HEHQ-1wgZ; Mon, 03 Aug 2026 13:47:06 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wqt0Q-0000000HED0-2a7N for linux-arm-kernel@lists.infradead.org; Mon, 03 Aug 2026 13:47:05 +0000 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 D6C3C1655; Mon, 3 Aug 2026 06:46:57 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.25.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4B96F3F66F; Mon, 3 Aug 2026 06:46:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1785764821; bh=R90GSqHKgNKLq0IbPcgJ2Xy7BoduOtRWpnHj0KKueKk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=W5i9r3b6l4ACstwJ4hcdMWGUNalMjpqK3Kfd2nYwLQ/rPRTuQYAK7sF0ZcIktlg2B HasUL/a8gkc/mzH1Bv24AeL0mjMDbypOSPJ+yuhJ4kIVYfC73yJuZiUsIlugGhPmd6 /2xke7+wX/ywgclM9eJm8JOCYys0O6htTk+rDxZ8= From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Joey Gouly , 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, Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Emi Kisanuki , Vishal Annapurve , WeiLin.Chang@arm.com, Lorenzo Pieralisi , Steven Price Subject: [PATCH v16 35/45] KVM: arm64: CCA: Support RSI_HOST_CALL Date: Mon, 3 Aug 2026 14:43:51 +0100 Message-ID: <20260803134403.80630-36-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260803134403.80630-1-steven.price@arm.com> References: <20260803134403.80630-1-steven.price@arm.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-20260803_064702_753059_B6E80A32 X-CRM114-Status: GOOD ( 12.36 ) 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 From: Joey Gouly Realm VMs can talk to the hypervisor using the RSI_HOST_CALL SMC. The RMM forwards this to the host and KVM handles them as regular hypercalls. Signed-off-by: Joey Gouly Signed-off-by: Steven Price --- Changes since v15: * Adapt to new exit handling. Changes since v7: * Avoid turning a negative return from kvm_smccc_call_handler() into a error response to the guest. Instead propagate the error back to user space. Changes since v4: * Setting GPRS is now done by kvm_rec_enter() rather than rec_exit_host_call() (see previous patch - arm64: RME: Handle realm enter/exit). This fixes a bug where the registers set by user space were being ignored. --- arch/arm64/kvm/rmi-exit.c | 1 + arch/arm64/kvm/rmi.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/arch/arm64/kvm/rmi-exit.c b/arch/arm64/kvm/rmi-exit.c index 1749cde2edff..7cde820bb77b 100644 --- a/arch/arm64/kvm/rmi-exit.c +++ b/arch/arm64/kvm/rmi-exit.c @@ -164,6 +164,7 @@ int kvm_rec_exit(struct kvm_vcpu *vcpu, int rec_run_ret) case RMI_EXIT_SERROR: return ARM_EXCEPTION_EL1_SERROR; case RMI_EXIT_PSCI: + case RMI_EXIT_HOST_CALL: rec_exit_hvc(vcpu); kvm_make_request(KVM_REQ_RMI, vcpu); return ARM_EXCEPTION_TRAP; diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c index 3f31ad25680f..904df7c7245d 100644 --- a/arch/arm64/kvm/rmi.c +++ b/arch/arm64/kvm/rmi.c @@ -1203,6 +1203,10 @@ int kvm_rec_handle_request(struct kvm_vcpu *vcpu) return kvm_rec_complete_psci(vcpu); case RMI_EXIT_RIPAS_CHANGE: return kvm_complete_ripas_change(vcpu); + case RMI_EXIT_HOST_CALL: + for (int i = 0; i < REC_RUN_GPRS; i++) + rec->run->enter.gprs[i] = vcpu_get_reg(vcpu, i); + break; default: KVM_BUG(1, vcpu->kvm, "Unhandled realm exit_reason"); return -ENXIO; -- 2.43.0