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 F20BBCD4851 for ; Wed, 13 May 2026 13:21:43 +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=CzyECUgD1Al7ly8S/NugxYUubgKL7VECyUQXJRa0jpY=; b=aydHysNHJYfE8ACE4gxrZSX/IX 3KIU70t74jsrDVzMwSL7SKOeArQHor35uf1wVZyUVO7nGZx7IDASMbzvtgbb0HHdIX/YNjWukHfQx v5iHFmURpQRcsswOEJgcqo8VG28B3Cs1kcR+G1c3vw3tpnnpMH6bxCEJT3SMnJIwRB1IRQLOcFNtO c8SIvn7dwQiS7brp1lkvA0KpgT+qQstprM5U9iyxz+u4b2zsxUF8U4RvMXn4EyirwMZVrb6f/2K7J gOGZTH2scnVdHhcQB3t22VpceBlgtqdgLl5Yy+hOdQO9tQbr7s+kuDpRUXn9Q4PAvO6DSJeLCt8CN lCRFuDtA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wN9Wr-00000002hon-0CDu; Wed, 13 May 2026 13:21:37 +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 1wN9Wf-00000002hau-2wVm for linux-arm-kernel@lists.infradead.org; Wed, 13 May 2026 13:21:35 +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 C9934237B; Wed, 13 May 2026 06:21:19 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.68.187]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BFC0D3F836; Wed, 13 May 2026 06:21:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1778678485; bh=S92MX2rKDgZT4QytCur3NTU0VCSRGCQScuI/rsDyJDc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OXllmkaFSzd/xU0iODXKmwxw0WNCV/NhLdT4WAmqGQoq+Qoi7baCoR57ibYpXPkXK atm2+8Z55fssBxDkYHjivb6y5NDCXHu97j1+okLy2vP8AEtDQzTW2m1T2V/LpPLOxO U1/M3tsB7Wv0b0svB1Wdc7T9P9ySPUpDeHEat3bE= 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.Pieralisi2@arm.com, Steven Price Subject: [PATCH v14 34/44] arm64: RMI: allow userspace to inject aborts Date: Wed, 13 May 2026 14:17:42 +0100 Message-ID: <20260513131757.116630-35-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260513131757.116630-1-steven.price@arm.com> References: <20260513131757.116630-1-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-20260513_062125_867078_232131A2 X-CRM114-Status: GOOD ( 15.80 ) 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 Extend KVM_SET_VCPU_EVENTS to support realms, where KVM cannot set the system registers, and the RMM must perform it on next REC entry. Signed-off-by: Joey Gouly Signed-off-by: Steven Price Reviewed-by: Gavin Shan --- Documentation/virt/kvm/api.rst | 2 ++ arch/arm64/kvm/guest.c | 24 ++++++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index a47c60490475..4e0dcca0d261 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -1314,6 +1314,8 @@ User space may need to inject several types of events to the guest. Set the pending SError exception state for this VCPU. It is not possible to 'cancel' an Serror that has been made pending. +User space cannot inject SErrors into Realms. + If the guest performed an access to I/O memory which could not be handled by userspace, for example because of missing instruction syndrome decode information or because there is no device mapped at the accessed IPA, then diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index e6682019ef6d..447674373426 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -827,6 +827,30 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu, u64 esr = events->exception.serror_esr; int ret = 0; + if (vcpu_is_rec(vcpu)) { + /* Cannot inject SError into a Realm. */ + if (serror_pending) + return -EINVAL; + + /* + * If a data abort is pending, set the flag and let the RMM + * inject an SEA when the REC is scheduled to be run. + */ + if (ext_dabt_pending) { + /* + * Can only inject SEA into a Realm if the previous exit + * was due to a data abort of an Unprotected IPA. + */ + if (!(vcpu->arch.rec.run->enter.flags & REC_ENTER_FLAG_EMULATED_MMIO)) + return -EINVAL; + + vcpu->arch.rec.run->enter.flags &= ~REC_ENTER_FLAG_EMULATED_MMIO; + vcpu->arch.rec.run->enter.flags |= REC_ENTER_FLAG_INJECT_SEA; + } + + return 0; + } + /* * Immediately commit the pending SEA to the vCPU's architectural * state which is necessary since we do not return a pending SEA -- 2.43.0