From patchwork Wed Apr 27 20:02:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 12829489 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 F2575C433FE for ; Wed, 27 Apr 2022 20:03:45 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 38F1A10E455; Wed, 27 Apr 2022 20:03:45 +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 2604010E377 for ; Wed, 27 Apr 2022 20:03:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1651089823; 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=JICLMFpK3jJ3Opx/D6G7EacoR9G87P/Z34aQ6aS+ZJc=; b=CfLDY/hxnFMS0UBGfCU7cBo+qq1wusCyFDa3drnWsTtJbADqSSh5GbsQx8GdFfozkX/u8T BJgHzLwNVWvrnVufWdgS0pcc8ycLT+Vc05Iy4ex3UlCO0xEqB8eXe46PTrpE39dimiXK2P DwIYyUqM0KqYQbwdCt16+ke9tcaUG4I= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-120-Sy16V930P4CpskDb-3jrlQ-1; Wed, 27 Apr 2022 16:03:41 -0400 X-MC-Unique: Sy16V930P4CpskDb-3jrlQ-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 61132802803; Wed, 27 Apr 2022 20:03:40 +0000 (UTC) Received: from localhost.localdomain (unknown [10.40.192.41]) by smtp.corp.redhat.com (Postfix) with ESMTP id E90F79E84; Wed, 27 Apr 2022 20:03:34 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Date: Wed, 27 Apr 2022 23:02:58 +0300 Message-Id: <20220427200314.276673-4-mlevitsk@redhat.com> In-Reply-To: <20220427200314.276673-1-mlevitsk@redhat.com> References: <20220427200314.276673-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 Subject: [Intel-gfx] [RFC PATCH v3 03/19] KVM: x86: SVM: remove avic's broken code that updated APIC ID 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: Wanpeng Li , David Airlie , Dave Hansen , dri-devel@lists.freedesktop.org, "H. Peter Anvin" , Brijesh Singh , Joerg Roedel , x86@kernel.org, Maxim Levitsky , Ingo Molnar , Tom Lendacky , intel-gfx@lists.freedesktop.org, Borislav Petkov , Rodrigo Vivi , Thomas Gleixner , intel-gvt-dev@lists.freedesktop.org, Jim Mattson , Sean Christopherson , linux-kernel@vger.kernel.org, Paolo Bonzini , Vitaly Kuznetsov Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" AVIC is now inhibited if the guest changes apic id, thus remove that broken code. Signed-off-by: Maxim Levitsky --- arch/x86/kvm/svm/avic.c | 35 ----------------------------------- 1 file changed, 35 deletions(-) diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c index 54fe03714f8a6..1102421668a11 100644 --- a/arch/x86/kvm/svm/avic.c +++ b/arch/x86/kvm/svm/avic.c @@ -508,35 +508,6 @@ static int avic_handle_ldr_update(struct kvm_vcpu *vcpu) return ret; } -static int avic_handle_apic_id_update(struct kvm_vcpu *vcpu) -{ - u64 *old, *new; - struct vcpu_svm *svm = to_svm(vcpu); - u32 id = kvm_xapic_id(vcpu->arch.apic); - - if (vcpu->vcpu_id == id) - return 0; - - old = avic_get_physical_id_entry(vcpu, vcpu->vcpu_id); - new = avic_get_physical_id_entry(vcpu, id); - if (!new || !old) - return 1; - - /* We need to move physical_id_entry to new offset */ - *new = *old; - *old = 0ULL; - to_svm(vcpu)->avic_physical_id_cache = new; - - /* - * Also update the guest physical APIC ID in the logical - * APIC ID table entry if already setup the LDR. - */ - if (svm->ldr_reg) - avic_handle_ldr_update(vcpu); - - return 0; -} - static void avic_handle_dfr_update(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); @@ -555,10 +526,6 @@ static int avic_unaccel_trap_write(struct kvm_vcpu *vcpu) AVIC_UNACCEL_ACCESS_OFFSET_MASK; switch (offset) { - case APIC_ID: - if (avic_handle_apic_id_update(vcpu)) - return 0; - break; case APIC_LDR: if (avic_handle_ldr_update(vcpu)) return 0; @@ -650,8 +617,6 @@ int avic_init_vcpu(struct vcpu_svm *svm) void avic_apicv_post_state_restore(struct kvm_vcpu *vcpu) { - if (avic_handle_apic_id_update(vcpu) != 0) - return; avic_handle_dfr_update(vcpu); avic_handle_ldr_update(vcpu); }