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 A1F01C433EF for ; Sat, 9 Oct 2021 02:15:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8E18B60F51 for ; Sat, 9 Oct 2021 02:15:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244538AbhJICRb (ORCPT ); Fri, 8 Oct 2021 22:17:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38382 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244607AbhJICQz (ORCPT ); Fri, 8 Oct 2021 22:16:55 -0400 Received: from mail-qk1-x74a.google.com (mail-qk1-x74a.google.com [IPv6:2607:f8b0:4864:20::74a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2EE6BC0613A3 for ; Fri, 8 Oct 2021 19:13:49 -0700 (PDT) Received: by mail-qk1-x74a.google.com with SMTP id b189-20020a3799c6000000b0045eb0c29072so9836941qke.12 for ; Fri, 08 Oct 2021 19:13:49 -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=wjQtX4Ec6wZvrLi6PMkrNqIQ2oyMcPdDf1m/MoA8d+0=; b=Lnm/cjPXbd272GpMZC0UeDF+UHTqiJU1haGCknMr5AmNFQOxgzVQrkCrFXx8cCosZZ vhad/H/bU6EtWHdiaGljqq6NEDe4jYwnagw1hmypkZVWw7KopTXWbIioXhrKeB9WZIoL ReDT+1R5eLOhM0x5my19UH6pmlRFdnAMJjCjW90ue2a+3KqjCQ5KVltKsfzvFJct3Or4 f9Oft1KiecdRxszaICFl0MAY6x3TalLjCr4OG45jGmzTw8bdrlGkucMOEXd/i271jan6 0hz+LH0reRdSJS/sNXpSqjCOVK3W+uTEL9F4YDHRKI7A05LpPRMlHE+Kaw+W+rV3UGa5 UrVw== 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=wjQtX4Ec6wZvrLi6PMkrNqIQ2oyMcPdDf1m/MoA8d+0=; b=GDJ07CTYdLSXMQpCbCU1MJIyW0gCpVlN9EGfzmCpkdwGNZcfFk+Yxsm+hKeYCHsRVk CtX3cu5zqcuCOKEWDbctAEtLZMtmMIRdpcbO3VMjDWbXhfNO+s9XNsinipnAP8OrEOyA UeUQFpYFj2KvN6ro0N89W4UxXN8hj9cBDoUZGSw3HRYaVUVJzLmqBH8Ufcpac/c44ANQ FkULBOQPDDorYQ15U/atRRxaAJVvcHF7sDNEGoKBPzwz+++WCCFsmXNADbSA6QuyPCz/ TS6XTAifeA6/D3mkZlmBv65zHyzSJPzdCyrTED4KtnxvmOEi6vXMgcfb8M8CQDaBq0wA yh+g== X-Gm-Message-State: AOAM531lXLe/T+0/OZ9EVozd7x9bbAivb+n1QdB1eaUL7vNRor8v6og9 1G3A9lEaZaZwkdj6LMQaP6xChIevXqM= X-Google-Smtp-Source: ABdhPJzf4lH44KnogukwF+1XfgXVpbO4vnuwdh3pwX1cj7Z8+jmbGSLZhM6YPlZ7b6MhcrCUeQd2OdsxOQw= X-Received: from seanjc798194.pdx.corp.google.com ([2620:15c:90:200:e39b:6333:b001:cb]) (user=seanjc job=sendgmr) by 2002:ac8:6113:: with SMTP id a19mr1849269qtm.307.1633745628357; Fri, 08 Oct 2021 19:13:48 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 8 Oct 2021 19:12:20 -0700 In-Reply-To: <20211009021236.4122790-1-seanjc@google.com> Message-Id: <20211009021236.4122790-28-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 27/43] KVM: VMX: Move Posted Interrupt ndst computation out of write loop 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 Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hoist the CPU => APIC ID conversion for the Posted Interrupt descriptor out of the loop to write the descriptor, preemption is disabled so the CPU won't change, and if the APIC ID changes KVM has bigger problems. No functional change intended. Signed-off-by: Sean Christopherson --- arch/x86/kvm/vmx/posted_intr.c | 25 +++++++++++-------------- 1 file changed, 11 insertions(+), 14 deletions(-) diff --git a/arch/x86/kvm/vmx/posted_intr.c b/arch/x86/kvm/vmx/posted_intr.c index fea343dcc011..2b2206339174 100644 --- a/arch/x86/kvm/vmx/posted_intr.c +++ b/arch/x86/kvm/vmx/posted_intr.c @@ -51,17 +51,15 @@ void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu) goto after_clear_sn; } - /* The full case. */ + /* The full case. Set the new destination and clear SN. */ + dest = cpu_physical_id(cpu); + if (!x2apic_mode) + dest = (dest << 8) & 0xFF00; + do { old.control = new.control = READ_ONCE(pi_desc->control); - dest = cpu_physical_id(cpu); - - if (x2apic_mode) - new.ndst = dest; - else - new.ndst = (dest << 8) & 0xFF00; - + new.ndst = dest; new.sn = 0; } while (cmpxchg64(&pi_desc->control, old.control, new.control) != old.control); @@ -103,15 +101,14 @@ static void __pi_post_block(struct kvm_vcpu *vcpu) WARN(pi_desc->nv != POSTED_INTR_WAKEUP_VECTOR, "Wakeup handler not enabled while the vCPU was blocking"); + dest = cpu_physical_id(vcpu->cpu); + if (!x2apic_mode) + dest = (dest << 8) & 0xFF00; + do { old.control = new.control = READ_ONCE(pi_desc->control); - dest = cpu_physical_id(vcpu->cpu); - - if (x2apic_mode) - new.ndst = dest; - else - new.ndst = (dest << 8) & 0xFF00; + new.ndst = dest; /* set 'NV' to 'notification vector' */ new.nv = POSTED_INTR_VECTOR; -- 2.33.0.882.g93a45727a2-goog