From patchwork Sat Oct 9 02:12:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 12546903 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 62E83C433FE for ; Sat, 9 Oct 2021 02:14:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 510B160FD7 for ; Sat, 9 Oct 2021 02:14:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244504AbhJICQN (ORCPT ); Fri, 8 Oct 2021 22:16:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38318 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244436AbhJICPt (ORCPT ); Fri, 8 Oct 2021 22:15:49 -0400 Received: from mail-qk1-x749.google.com (mail-qk1-x749.google.com [IPv6:2607:f8b0:4864:20::749]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A0160C06176F for ; Fri, 8 Oct 2021 19:13:26 -0700 (PDT) Received: by mail-qk1-x749.google.com with SMTP id c16-20020a05620a0cf000b0045f1d55407aso5547840qkj.22 for ; Fri, 08 Oct 2021 19:13:26 -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=qbaTmooIqpw2scwWIPvYnbgTG8gkipCw/gcnfpltSGY=; b=FuJT0BM9dDnYucltpEKN/3PIbfdvyXmexJqecK3YzG4d74UzCBAUJzNpfna5d3hhf9 CThoB+q3zbECmvBpsVwSPC65vqE3PC/pyRXG3MptW0vOaTjGmTNfFzi4I7G//ciy+nJL p2SrF4m156i96jaV+xzdhT+w6QkXcy0HHxtm4YS01i3rZ/GAWxIlxZ4cG090KNqUoG+F MZ7IfesCmYwBPSKodHNoD1ZFOQvtV8bnYcdLR84ii1K0oqwvG/i2DqC+H4C9C8AdNE7S NtI/ovPQV920bh3qJxqxqTJF2XHwSs9PcFYmvUBVFETjJlGAhfkCawm/pDGPWqba98m2 bBYQ== 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=qbaTmooIqpw2scwWIPvYnbgTG8gkipCw/gcnfpltSGY=; b=Barhgc47P1taWaVpuh5vTlvG2sbtPWNc7YlD2vkUXWdkI1ILPEfxaUeI+emu6VHTvC psEcfK8+iQ/n5ZxZYPc/L2Yr1R6te7F4sxXDmwW51vQxGruLrKZP0uBi/JyRK1CHJt9R 9dyFY0OtQH3FT1xuFO4vPWPnk8wUlgwKuvDDu9LZBarwN+FcPJ4e+ULYtdhjKMOHNkSs n3f6VOnGi0OysXbEtZZ8bWAZDVgis8kz82xC+Me7kuxGxMeIqcDxsxfPTMWMe7993/TY JkwapQVuRyh0PRDEZ0rLAliBy8LtHhkZGq8VpX5zsPH+nhcZu337P/vlkRwvtwNtPKip wZHQ== X-Gm-Message-State: AOAM532L9Yc1w2RB8GsANjh7i/4LWKMls8issOMigM1ptpTxnXtEg2ON yNKVPT0wpWbmmCpIfOB/JC5/eVNFa1s= X-Google-Smtp-Source: ABdhPJzmsEVzPU7/MqwbML2H7/jnReeletG9BCOCcGkMjuKkxZyo31ypELMFzY3g7cKF9pg0VOLbDRLLOow= X-Received: from seanjc798194.pdx.corp.google.com ([2620:15c:90:200:e39b:6333:b001:cb]) (user=seanjc job=sendgmr) by 2002:ac8:4e11:: with SMTP id c17mr1903866qtw.400.1633745605808; Fri, 08 Oct 2021 19:13:25 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 8 Oct 2021 19:12:11 -0700 In-Reply-To: <20211009021236.4122790-1-seanjc@google.com> Message-Id: <20211009021236.4122790-19-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 18/43] KVM: x86: Invoke kvm_vcpu_block() directly for non-HALTED wait states 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 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Call kvm_vcpu_block() directly for all wait states except HALTED so that kvm_vcpu_halt() is no longer a misnomer on x86. Functionally, this means KVM will never attempt halt-polling or adjust vcpu->halt_poll_ns for INIT_RECEIVED (a.k.a. Wait-For-SIPI (WFS)) or AP_RESET_HOLD; UNINITIALIZED is handled in kvm_arch_vcpu_ioctl_run(), and x86 doesn't use any other "wait" states. As mentioned above, the motivation of this is purely so that "halt" isn't overloaded on x86, e.g. in KVM's stats. Skipping halt-polling for WFS (and RESET_HOLD) has no meaningful effect on guest performance as there are typically single-digit numbers of INIT-SIPI sequences per AP vCPU, per boot, versus thousands of HLTs just to boot to console. Reviewed-by: David Matlack Signed-off-by: Sean Christopherson Reviewed-by: Maxim Levitsky --- arch/x86/kvm/x86.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index cd51f100e906..e0219acfd9cf 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9899,7 +9899,10 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu) if (!kvm_arch_vcpu_runnable(vcpu) && (!kvm_x86_ops.pre_block || static_call(kvm_x86_pre_block)(vcpu) == 0)) { srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); - kvm_vcpu_halt(vcpu); + if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED) + kvm_vcpu_halt(vcpu); + else + kvm_vcpu_block(vcpu); vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); if (kvm_x86_ops.post_block)