From patchwork Wed Apr 27 20:02:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 12829508 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 97D27C433FE for ; Wed, 27 Apr 2022 20:03:39 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 55D2B10E321; Wed, 27 Apr 2022 20:03:36 +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 1966F10E315 for ; Wed, 27 Apr 2022 20:03:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1651089812; 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=O/591BE30Gw+sLgR7wcCQy4XNcbdAfVRmL/PYPXct/c=; b=d3oqXRNYd5pHMB3mzaVN1vlhLNn76DvyhDoQc7EXA5RVPW7Z94BHo4MRJ7JN6wEhy2nELg JV0QFfmWD8nyiiLPwMsOnizRQSQ6ljapxR7hwhwmhnLVgcwcpw5eFMEKXnxF4HWkhjnVDk qOAhuXllJe9doEzIvJvq38FYHPyhosM= 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-550-dQOqBeYMObyNtmOAhvPWIA-1; Wed, 27 Apr 2022 16:03:30 -0400 X-MC-Unique: dQOqBeYMObyNtmOAhvPWIA-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 06EDD8039D7; Wed, 27 Apr 2022 20:03:29 +0000 (UTC) Received: from localhost.localdomain (unknown [10.40.192.41]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6323F9E82; Wed, 27 Apr 2022 20:03:23 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Subject: [RFC PATCH v3 01/19] KVM: x86: document AVIC/APICv inhibit reasons Date: Wed, 27 Apr 2022 23:02:56 +0300 Message-Id: <20220427200314.276673-2-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 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - 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 , Zhi Wang , Tom Lendacky , intel-gfx@lists.freedesktop.org, Borislav Petkov , Rodrigo Vivi , Thomas Gleixner , intel-gvt-dev@lists.freedesktop.org, Jim Mattson , Tvrtko Ursulin , Sean Christopherson , linux-kernel@vger.kernel.org, Paolo Bonzini , Vitaly Kuznetsov Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" These days there are too many AVIC/APICv inhibit reasons, and it doesn't hurt to have some documentation for them. Signed-off-by: Maxim Levitsky --- arch/x86/include/asm/kvm_host.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index f164c6c1514a4..63eae00625bda 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1046,14 +1046,29 @@ struct kvm_x86_msr_filter { }; enum kvm_apicv_inhibit { + /* APICv/AVIC is disabled by module param and/or not supported in hardware */ APICV_INHIBIT_REASON_DISABLE, + /* APICv/AVIC is inhibited because AutoEOI feature is being used by a HyperV guest*/ APICV_INHIBIT_REASON_HYPERV, + /* AVIC is inhibited on a CPU because it runs a nested guest */ APICV_INHIBIT_REASON_NESTED, + /* AVIC is inhibited due to wait for an irq window (AVIC doesn't support this) */ APICV_INHIBIT_REASON_IRQWIN, + /* + * AVIC is inhibited because i8254 're-inject' mode is used + * which needs EOI intercept which AVIC doesn't support + */ APICV_INHIBIT_REASON_PIT_REINJ, + /* AVIC is inhibited because the guest has x2apic in its CPUID*/ APICV_INHIBIT_REASON_X2APIC, + /* AVIC/APICv is inhibited because KVM_GUESTDBG_BLOCKIRQ was enabled */ APICV_INHIBIT_REASON_BLOCKIRQ, + /* + * AVIC/APICv is inhibited because the guest didn't yet + * enable kernel/split irqchip + */ APICV_INHIBIT_REASON_ABSENT, + /* AVIC is disabled because SEV doesn't support it */ APICV_INHIBIT_REASON_SEV, };