From nobody Sun Sep 14 03:53:17 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 78B41C61DA7 for ; Fri, 27 Jan 2023 11:42:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233960AbjA0LmR (ORCPT ); Fri, 27 Jan 2023 06:42:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60896 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233762AbjA0Llh (ORCPT ); Fri, 27 Jan 2023 06:41:37 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E60697A490; Fri, 27 Jan 2023 03:41:07 -0800 (PST) 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 B09E016F3; Fri, 27 Jan 2023 03:31:25 -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 A98B13F64C; Fri, 27 Jan 2023 03:30:41 -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 24/28] arm64: rme: allow userspace to inject aborts Date: Fri, 27 Jan 2023 11:29:28 +0000 Message-Id: <20230127112932.38045-25-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> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 --- 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 f1a59d6fb7fc..18a8ddaf31d8 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -1238,6 +1238,8 @@ 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. =20 +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 93468bbfb50e..6e53e0ef2fba 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -851,6 +851,30 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu, bool has_esr =3D events->exception.serror_has_esr; bool ext_dabt_pending =3D events->exception.ext_dabt_pending; =20 + 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->entry.flags & RMI_EMULATED_MMIO)) + return -EINVAL; + + vcpu->arch.rec.run->entry.flags &=3D ~RMI_EMULATED_MMIO; + vcpu->arch.rec.run->entry.flags |=3D RMI_INJECT_SEA; + } + + return 0; + } + if (serror_pending && has_esr) { if (!cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) return -EINVAL; --=20 2.34.1