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 94F8EC433F5 for ; Sat, 9 Oct 2021 02:33:25 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6156860F5A for ; Sat, 9 Oct 2021 02:33:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 6156860F5A Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:Reply-To:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:From:Subject:References :Mime-Version:Message-Id:In-Reply-To:Date:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=wPYn+xzeqIb28XzXUpyDeJ/Ob/QDyXWBlt08Ro9c6x8=; b=C2DkZtGVG/SoyH X9IykNkE5gy+VPRPFPXJcmQPp3JBh34jMuR7hGHyN990HNrDBh0xq6UnvsXRIT3d00pqVLyQUqEsd yQnZppCjTPQd7WaPQKf9lxQufgqtgcjmFeMzPHwF0RQtbqXZcGvw/zxVSetehrq8n0mjUqx5j3rmN yCUqRRhZ02WolHq+VT3l96uqzMiGmHs0JmKs8r94CyxW8kUJLnjMdEUi27OHFGDhw3yWLIBMqn9BA Gvmki6HcdQBlicVuFiW/UyKJbIeFabgYZNLQXqxrsOTW0RC4vPOG+NAPlwZIgsL+zLF6SxyxBhqkZ lAYgTmivLsOwW8nSHKmg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mZ2Ae-004ccw-Tl; Sat, 09 Oct 2021 02:33:08 +0000 Received: from mail-yb1-xb4a.google.com ([2607:f8b0:4864:20::b4a]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mZ1rg-004UEh-VV for linux-riscv@lists.infradead.org; Sat, 09 Oct 2021 02:13:35 +0000 Received: by mail-yb1-xb4a.google.com with SMTP id b5-20020a251b05000000b005b575f23711so15169872ybb.4 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=uY+3VNRSedTQ1p9rqJbZux3V+wdMPnoc+hWGZ+JxOEqySQsXbVAN3ivc19gVIpIzI0 opNBN4LgqIchABQtC5ZRAx5PqOacHlZ0yVYQJsjyNoUGHHPuAdiRRA5W0sDzBD2hneDO YZk/LRovlO8/oVSq7Bj8m0ohdKqqYUiW+CjjzNVY0POv1zKt2XSrBEImGlM+g4Gu9aTw HZt4dIbCjhG2swOJT5WiepcM+7bMDTHUug0f4L6U6EmH1soTU6Kjx8q5vndfT7B5Eh5B UHuOl4ipZrFQ9jFBHl/rsbjeUmaCwL2qLxL5DjA1NM8ffVHZ6RUc/NllQX+qaPdydDpd w0vQ== X-Gm-Message-State: AOAM533Y/6Kn7VP8ccUulZmbh3f0ZaQD1h8GPtoL3zDjQ6XJlpPvc5wh /8n8QWfffBkmPGt2P+rWxAsNp/Uo8Z8= 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: James Morse , Alexandru Elisei , Suzuki K Poulose , Atish Patra , David Hildenbrand , Cornelia Huck , Claudio Imbrenda , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, David Matlack , Oliver Upton , Jing Zhang X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211008_191333_104195_4A3B3E0F X-CRM114-Status: GOOD ( 12.86 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 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 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv