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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98D5FC433F5 for ; Sat, 9 Oct 2021 02:13:37 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 50BF761038 for ; Sat, 9 Oct 2021 02:13:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 50BF761038 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 065E44B174; Fri, 8 Oct 2021 22:13:37 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OXYGYKnPkxh7; Fri, 8 Oct 2021 22:13:36 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id E04F94B156; Fri, 8 Oct 2021 22:13:35 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 21DD04B13E for ; Fri, 8 Oct 2021 22:13:34 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MblOle1wTkyV for ; Fri, 8 Oct 2021 22:13:33 -0400 (EDT) Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 8C9204B0D7 for ; Fri, 8 Oct 2021 22:13:31 -0400 (EDT) Received: by mail-yb1-f202.google.com with SMTP id v203-20020a25c5d4000000b005bb21580411so2358387ybe.19 for ; Fri, 08 Oct 2021 19:13:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=JkZfdKKKsnqnpAtGUC7eJv8NSTwENPUfH6MKqHK3m28=; b=qVLIqxee/wprC+4bjZNYJueP2zjkd+ggVBKmgUwNSOpnEV7X/9yGfblAJrRqdCWEih HkkaQsOOaOeL+/6gKeVGYHju8vK+HKNcdt3bTPsONepW8SXVyQdRvqfaAKZcB8+jVwae l3QyVEsfib1Ds5XSLDwK5fjGQZuWnnjDxgzphYDPgXfwssEpRJVHvOakRnpFdPD78q0R +0gwjhJzjz6GJsBbS0TZrWfFGUf6BV3+uE57g+PTVVc8UKWIe6wyeSoVcPpQNBbE7SiU oPp2V17b+NBHZjC8Iixu81AY6DPeXf4DpNjHUN5949xj5Ej8bfX8i2do7PuBJAHe/oBY ATyg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=JkZfdKKKsnqnpAtGUC7eJv8NSTwENPUfH6MKqHK3m28=; b=ZdmDRNr1gvJO7YeDj7q56KfJzRahIyBHAqaECzZaDkTNfVp54F3YhT4cXj74d3NDvu V2gpq/wPEEKPm3OHSmCyT6UFNJo5pThIpM3RaEsb412cC4/n9esslNcd9n5YMv+qKSGt 4ZyvkhjGi+tTif3oTiBFW5JATvKQp21R1TdE69rrNgrRR2n9inoCZEfW/QkZdaFLal6c 8IMKaXlUWqjsEVvfNGBYw5LsJLOqro1vzBOTrDP6oRzj+7l17K+c7049eVdAtB97AXGn zlQh5vuSDaLYU3ax7E0A7EYuJW0FODkNHb6XyJncJld5gWKGJVk820bkWLKhH2A46Q5y IcUA== X-Gm-Message-State: AOAM533bsZUwTnr5suIQ4icHeXzzDdWn0/UOOPMblEavNfctun/9+08v 9pfaachTnYeEEBn9Ljs3gdq+bWMMDvk= X-Google-Smtp-Source: ABdhPJzgeMmRSEoifPybAsuoSY+JDjln6XTZNwptycydEyLK/6KcdeEb7uS4dZEit5L6yoPPTC+t8rdx1rg= X-Received: from seanjc798194.pdx.corp.google.com ([2620:15c:90:200:e39b:6333:b001:cb]) (user=seanjc job=sendgmr) by 2002:a5b:d03:: with SMTP id y3mr7590634ybp.400.1633745611129; Fri, 08 Oct 2021 19:13:31 -0700 (PDT) Date: Fri, 8 Oct 2021 19:12:13 -0700 In-Reply-To: <20211009021236.4122790-1-seanjc@google.com> Message-Id: <20211009021236.4122790-21-seanjc@google.com> Mime-Version: 1.0 References: <20211009021236.4122790-1-seanjc@google.com> X-Mailer: git-send-email 2.33.0.882.g93a45727a2-goog Subject: [PATCH v2 20/43] KVM: VMX: Skip Posted Interrupt updates if APICv is hard disabled From: Sean Christopherson To: Marc Zyngier , Huacai Chen , Aleksandar Markovic , Paul Mackerras , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Paolo Bonzini Cc: Wanpeng Li , kvm@vger.kernel.org, David Hildenbrand , linux-kernel@vger.kernel.org, Atish Patra , linux-riscv@lists.infradead.org, Claudio Imbrenda , kvmarm@lists.cs.columbia.edu, Joerg Roedel , kvm-ppc@vger.kernel.org, David Matlack , linux-arm-kernel@lists.infradead.org, Jim Mattson , Cornelia Huck , linux-mips@vger.kernel.org, kvm-riscv@lists.infradead.org, Vitaly Kuznetsov X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list Reply-To: Sean Christopherson 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 Explicitly skip posted interrupt updates if APICv is disabled in all of KVM, or if the guest doesn't have an in-kernel APIC. The PI descriptor is kept up-to-date if APICv is inhibited, e.g. so that re-enabling APICv doesn't require a bunch of updates, but neither the module param nor the APIC type can be changed on-the-fly. Signed-off-by: Sean Christopherson --- arch/x86/kvm/vmx/posted_intr.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/vmx/posted_intr.c b/arch/x86/kvm/vmx/posted_intr.c index 3263056784f5..351666c41bbc 100644 --- a/arch/x86/kvm/vmx/posted_intr.c +++ b/arch/x86/kvm/vmx/posted_intr.c @@ -28,11 +28,14 @@ void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu) unsigned int dest; /* - * In case of hot-plug or hot-unplug, we may have to undo - * vmx_vcpu_pi_put even if there is no assigned device. And we - * always keep PI.NDST up to date for simplicity: it makes the - * code easier, and CPU migration is not a fast path. + * To simplify hot-plug and dynamic toggling of APICv, keep PI.NDST and + * PI.SN up-to-date even if there is no assigned device or if APICv is + * deactivated due to a dynamic inhibit bit, e.g. for Hyper-V's SyncIC. */ + if (!enable_apicv || !lapic_in_kernel(vcpu)) + return; + + /* Nothing to do if PI.SN==0 and the vCPU isn't being migrated. */ if (!pi_test_sn(pi_desc) && vcpu->cpu == cpu) return; -- 2.33.0.882.g93a45727a2-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm