From patchwork Mon Feb 7 15:28:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 12737440 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 6F849C433EF for ; Mon, 7 Feb 2022 15:31:58 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 33DD2112460; Mon, 7 Feb 2022 15:31:57 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id D368B11245F for ; Mon, 7 Feb 2022 15:31:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1644247915; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qZTGmWS8KYVLiOi++oL+/LS4m4MbwSz3cj1OP+bvfJo=; b=aDBO4ge/cV8DFI7aM5wCL8r6A9gqig9ut1b4RvEJPOpaz3jcJ+I/gMi5sS7M1q2OSOr+wO y2BlqvhQ3Z4GkRFsgWFwwrte0830ERLI9ZzarUmiSYjgxO+UgHqRF0y6VfOuIU8Porh2Z2 2p73rzTh7mOHtVy8/TDneFlKIqqQWGQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-204-IDOF_Mr9PRG9c6ZS-owvLw-1; Mon, 07 Feb 2022 10:31:51 -0500 X-MC-Unique: IDOF_Mr9PRG9c6ZS-owvLw-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9424B1800D50; Mon, 7 Feb 2022 15:31:47 +0000 (UTC) Received: from localhost.localdomain (unknown [10.40.192.15]) by smtp.corp.redhat.com (Postfix) with ESMTP id 07ECB5E495; Mon, 7 Feb 2022 15:31:39 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Date: Mon, 7 Feb 2022 17:28:31 +0200 Message-Id: <20220207152847.836777-15-mlevitsk@redhat.com> In-Reply-To: <20220207152847.836777-1-mlevitsk@redhat.com> References: <20220207152847.836777-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Subject: [Intel-gfx] [PATCH 14/30] KVM: x86: lapic: don't allow to change local apic id when using older x2apic api X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Hansen , Wanpeng Li , David Airlie , "Chang S. Bae" , "maintainer:X86 ARCHITECTURE 32-BIT AND 64-BIT" , "open list:X86 ARCHITECTURE 32-BIT AND 64-BIT" , Maxim Levitsky , Tony Luck , "open list:DRM DRIVERS" , Brijesh Singh , Paolo Bonzini , Vitaly Kuznetsov , Jim Mattson , "open list:INTEL GVT-g DRIVERS Intel GPU Virtualization" , "open list:INTEL DRM DRIVERS excluding Poulsbo, Moorestow..., Joerg Roedel , Borislav Petkov , Daniel Vetter , \"H. Peter Anvin\" , Ingo Molnar , Sean Christopherson , Joonas Lahtinen , Pawan Gupta , Thomas Gleixner " , Kan Liang Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" KVM allowed to set non boot apic id via setting apic state if using older non x2apic 32 bit apic id userspace api. Signed-off-by: Maxim Levitsky --- arch/x86/kvm/lapic.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 7ff695cab27b2..aeddd68d31181 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -2592,15 +2592,15 @@ static int kvm_apic_state_fixup(struct kvm_vcpu *vcpu, if (enable_apicv && (*id >> 24) != vcpu->vcpu_id) return -EINVAL; } else { - if (vcpu->kvm->arch.x2apic_format) { - if (*id != vcpu->vcpu_id) - return -EINVAL; - } else { - if (set) - *id >>= 24; - else - *id <<= 24; - } + + if (!vcpu->kvm->arch.x2apic_format && set) + *id >>= 24; + + if (*id != vcpu->vcpu_id) + return -EINVAL; + + if (!vcpu->kvm->arch.x2apic_format && !set) + *id <<= 24; /* In x2APIC mode, the LDR is fixed and based on the id */ if (set)