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 X-Spam-Level: X-Spam-Status: No, score=-16.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DC253C433B4 for ; Fri, 7 May 2021 06:32:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BE476613ED for ; Fri, 7 May 2021 06:32:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234638AbhEGGdC (ORCPT ); Fri, 7 May 2021 02:33:02 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:43397 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234498AbhEGGdA (ORCPT ); Fri, 7 May 2021 02:33:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1620369120; 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=WmO12IyDy5qzS+T4IY7K2Y+LJ28N9E7M0ofJOxtqPww=; b=gOjQ6FX1H3KmZkpDd2VUDi0YAElnHcfQNj10QUTeb65Uwg3lPsLjwSZm2Tl/3hIdIh9Bvf 27U7p/rWObXb2LFoZmSXdgIvxLBHQ1WxUlIvgQUicDyiqyV3G4Ehw35mZruSONDRnz2aDj HLFLfHTvY8u4yDI3ZweQb26xSu88jYQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-385-SibVCbJzOIS5nuuLENUmVg-1; Fri, 07 May 2021 02:31:56 -0400 X-MC-Unique: SibVCbJzOIS5nuuLENUmVg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id F356580059E; Fri, 7 May 2021 06:31:54 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-42.bne.redhat.com [10.64.54.42]) by smtp.corp.redhat.com (Postfix) with ESMTP id A6A635D9CA; Fri, 7 May 2021 06:31:51 +0000 (UTC) From: Gavin Shan To: kvmarm@lists.cs.columbia.edu Cc: linux-kernel@vger.kernel.org, maz@kernel.org, will@kernel.org, pbonzini@redhat.com, james.morse@arm.com, mark.rutland@arm.com, Jonathan.Cameron@huawei.com, shan.gavin@gmail.com Subject: [PATCH v3 06/21] KVM: arm64: Support SDEI_EVENT_CONTEXT hypercall Date: Fri, 7 May 2021 16:31:09 +0800 Message-Id: <20210507083124.43347-7-gshan@redhat.com> In-Reply-To: <20210507083124.43347-1-gshan@redhat.com> References: <20210507083124.43347-1-gshan@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 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 retrieved the original registers (R0 - R17) in its SDEI event handler. Those registers can be corrupted during the SDEI event delivery. Signed-off-by: Gavin Shan --- arch/arm64/kvm/sdei.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c index b022ce0a202b..b4162efda470 100644 --- a/arch/arm64/kvm/sdei.c +++ b/arch/arm64/kvm/sdei.c @@ -270,6 +270,44 @@ static unsigned long kvm_sdei_hypercall_enable(struct kvm_vcpu *vcpu, return ret; } +static unsigned long kvm_sdei_hypercall_context(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = vcpu->kvm; + struct kvm_sdei_kvm *ksdei = kvm->arch.sdei; + struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei; + struct kvm_sdei_vcpu_regs *regs; + unsigned long index = smccc_get_arg1(vcpu); + unsigned long ret = SDEI_SUCCESS; + + /* Sanity check */ + if (!(ksdei && vsdei)) { + ret = SDEI_NOT_SUPPORTED; + goto out; + } + + if (index > ARRAY_SIZE(vsdei->state.critical_regs.regs)) { + ret = SDEI_INVALID_PARAMETERS; + goto out; + } + + /* Check if the pending event exists */ + spin_lock(&vsdei->lock); + 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; + ret = regs->regs[index]; + +unlock: + spin_unlock(&vsdei->lock); +out: + return ret; +} + int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) { u32 func = smccc_get_function(vcpu); @@ -290,6 +328,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) ret = kvm_sdei_hypercall_enable(vcpu, false); break; case SDEI_1_0_FN_SDEI_EVENT_CONTEXT: + ret = kvm_sdei_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 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 X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 13EA2C433B4 for ; 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b=Rua+bFgZu5FT6mAFm3BK/V76bARryqIW1sGGgVKCSs1xVwcPOwitfk+g38uvPckkpzFEBL D88acSEkLQUr1UAHnIEkkcT3X0zSev3EsjM+GuIXK+UNcegSW20IoEzn1Z0g0vBGe1XHjr BUXVD2jWo6LHGC4ZzUazrGsDw8TJ7Ns= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-385-SibVCbJzOIS5nuuLENUmVg-1; Fri, 07 May 2021 02:31:56 -0400 X-MC-Unique: SibVCbJzOIS5nuuLENUmVg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id F356580059E; Fri, 7 May 2021 06:31:54 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-42.bne.redhat.com [10.64.54.42]) by smtp.corp.redhat.com (Postfix) with ESMTP id A6A635D9CA; Fri, 7 May 2021 06:31:51 +0000 (UTC) From: Gavin Shan To: kvmarm@lists.cs.columbia.edu Subject: [PATCH v3 06/21] KVM: arm64: Support SDEI_EVENT_CONTEXT hypercall Date: Fri, 7 May 2021 16:31:09 +0800 Message-Id: <20210507083124.43347-7-gshan@redhat.com> In-Reply-To: <20210507083124.43347-1-gshan@redhat.com> References: <20210507083124.43347-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Cc: maz@kernel.org, linux-kernel@vger.kernel.org, shan.gavin@gmail.com, Jonathan.Cameron@huawei.com, pbonzini@redhat.com, will@kernel.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu This supports SDEI_EVENT_CONTEXT hypercall. It's used by the guest to retrieved the original registers (R0 - R17) in its SDEI event handler. Those registers can be corrupted during the SDEI event delivery. Signed-off-by: Gavin Shan --- arch/arm64/kvm/sdei.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c index b022ce0a202b..b4162efda470 100644 --- a/arch/arm64/kvm/sdei.c +++ b/arch/arm64/kvm/sdei.c @@ -270,6 +270,44 @@ static unsigned long kvm_sdei_hypercall_enable(struct kvm_vcpu *vcpu, return ret; } +static unsigned long kvm_sdei_hypercall_context(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = vcpu->kvm; + struct kvm_sdei_kvm *ksdei = kvm->arch.sdei; + struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei; + struct kvm_sdei_vcpu_regs *regs; + unsigned long index = smccc_get_arg1(vcpu); + unsigned long ret = SDEI_SUCCESS; + + /* Sanity check */ + if (!(ksdei && vsdei)) { + ret = SDEI_NOT_SUPPORTED; + goto out; + } + + if (index > ARRAY_SIZE(vsdei->state.critical_regs.regs)) { + ret = SDEI_INVALID_PARAMETERS; + goto out; + } + + /* Check if the pending event exists */ + spin_lock(&vsdei->lock); + 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; + ret = regs->regs[index]; + +unlock: + spin_unlock(&vsdei->lock); +out: + return ret; +} + int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) { u32 func = smccc_get_function(vcpu); @@ -290,6 +328,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) ret = kvm_sdei_hypercall_enable(vcpu, false); break; case SDEI_1_0_FN_SDEI_EVENT_CONTEXT: + ret = kvm_sdei_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 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm