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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65835C433F5 for ; Tue, 22 Mar 2022 08:08:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229930AbiCVIKW (ORCPT ); Tue, 22 Mar 2022 04:10:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53914 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229816AbiCVIKO (ORCPT ); Tue, 22 Mar 2022 04:10:14 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 74CA42BFA for ; Tue, 22 Mar 2022 01:08:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1647936526; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CA0H5z8Y8jCywSeEwJTZ/p/KNFj1y45LOqR+04gyQvM=; b=P4lejcfDAKxMRzaHpAeRSzLSu6hyMzT1etaaXEZuOz37uFb5/hryx/Tz5CqoWausnHFmyT MRAhDcLjDHMyhIMfjZp2etuRx1IjL80eW9gLobgHVLhxKNVKNzX2c0agKBZ+IY5ts+ANER 9XGBqOqMXnJTftO4DgTHS0XXL1CnjvU= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-594-IV6VDCqaMjeWV-YfzD9R6Q-1; Tue, 22 Mar 2022 04:08:43 -0400 X-MC-Unique: IV6VDCqaMjeWV-YfzD9R6Q-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C0B5B1C05AF2; Tue, 22 Mar 2022 08:08:42 +0000 (UTC) Received: from gshan.redhat.com (ovpn-12-33.pek2.redhat.com [10.72.12.33]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0ACDB1121324; Tue, 22 Mar 2022 08:08:32 +0000 (UTC) From: Gavin Shan To: kvmarm@lists.cs.columbia.edu Cc: linux-kernel@vger.kernel.org, eauger@redhat.com, shannon.zhaosl@gmail.com, maz@kernel.org, Jonathan.Cameron@huawei.com, will@kernel.org, pbonzini@redhat.com, james.morse@arm.com, mark.rutland@arm.com, drjones@redhat.com, vkuznets@redhat.com, shan.gavin@gmail.com Subject: [PATCH v5 06/22] KVM: arm64: Support SDEI_EVENT_CONTEXT hypercall Date: Tue, 22 Mar 2022 16:06:54 +0800 Message-Id: <20220322080710.51727-7-gshan@redhat.com> In-Reply-To: <20220322080710.51727-1-gshan@redhat.com> References: <20220322080710.51727-1-gshan@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This supports SDEI_EVENT_CONTEXT hypercall. It's used by the guest to retrieve the registers (R0 - R17) in the preempted context in the SDEI event handler. The preempted context is saved prior to servicing or handling the SDEI event and restored after that. Signed-off-by: Gavin Shan --- arch/arm64/kvm/sdei.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c index 4ab58f264992..4488d3f044f2 100644 --- a/arch/arm64/kvm/sdei.c +++ b/arch/arm64/kvm/sdei.c @@ -297,6 +297,34 @@ static unsigned long hypercall_enable(struct kvm_vcpu *vcpu, bool enable) return ret; } +static unsigned long hypercall_context(struct kvm_vcpu *vcpu) +{ + struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei; + struct kvm_sdei_vcpu_regs_state *regs; + unsigned long param_id = smccc_get_arg1(vcpu); + unsigned long ret = SDEI_SUCCESS; + + spin_lock(&vsdei->lock); + + /* Check if the pending event exists */ + if (!vsdei->critical_event && !vsdei->normal_event) { + ret = SDEI_DENIED; + goto unlock; + } + + /* Fetch the requested register */ + regs = vsdei->critical_event ? &vsdei->state.critical_regs : + &vsdei->state.normal_regs; + if (param_id < ARRAY_SIZE(regs->regs)) + ret = regs->regs[param_id]; + else + ret = SDEI_INVALID_PARAMETERS; + +unlock: + spin_unlock(&vsdei->lock); + return ret; +} + int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) { struct kvm *kvm = vcpu->kvm; @@ -333,6 +361,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) ret = hypercall_enable(vcpu, false); break; case SDEI_1_0_FN_SDEI_EVENT_CONTEXT: + ret = hypercall_context(vcpu); + break; case SDEI_1_0_FN_SDEI_EVENT_COMPLETE: case SDEI_1_0_FN_SDEI_EVENT_COMPLETE_AND_RESUME: case SDEI_1_0_FN_SDEI_EVENT_UNREGISTER: -- 2.23.0