From patchwork Sat Sep 25 00:55:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 12517135 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 BB547C433EF for ; Sat, 25 Sep 2021 00:57:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A742F61265 for ; Sat, 25 Sep 2021 00:57:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346695AbhIYA7L (ORCPT ); Fri, 24 Sep 2021 20:59:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40374 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346378AbhIYA6d (ORCPT ); Fri, 24 Sep 2021 20:58:33 -0400 Received: from mail-qv1-xf4a.google.com (mail-qv1-xf4a.google.com [IPv6:2607:f8b0:4864:20::f4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D8C91C0613A7 for ; Fri, 24 Sep 2021 17:56:01 -0700 (PDT) Received: by mail-qv1-xf4a.google.com with SMTP id p12-20020ad4496c000000b0037a535cb8b2so43084576qvy.15 for ; Fri, 24 Sep 2021 17:56:01 -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=tGZGtRLoZzNRBWuDX4atzZ2k0Ip4ycJYdNIYDqARGnc=; b=q8E3mpn27/Pass6ib5GcuNokaZJD0e7qJsR4kNTZjxo9jjWSI+mPtm05xarcRKasl1 eiFJZIt6Waa+VtYIE206wV5Amydeo2kxEZobGt+H4Q7ebAG/VEzonmVr8CFk6YXe+jXN W06JSJIyK8g02iwbmqnvaWK7HXlJE0p7Kr92YW24blQoLluhFcvm1UzWcfdHx6Mdh9E3 XOOQzUfJHlMrFgWO0gIitekddWDl9aJ5BQBVyiZFtwCnwmzu20R18ovjRC2G+D/w+g99 M1FfmCuusJk2YNOkp6OkdVHAMCjUZdoms1MR0veWZuhlJz5kL9fGMpAA8u0K0cmeYPze HHkg== 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=tGZGtRLoZzNRBWuDX4atzZ2k0Ip4ycJYdNIYDqARGnc=; b=w0K9aACxbhxy7rYhoQn1Vl9jlz2xaix0Em1UoYsdGrH6kn9lzw1Ngh0zTZaltIknOV jNT15Rpof0lpgLIYJ3YAL93fhOLYTseIGLYTdB8LWw9E7BVcBhVrcl2UQ3SFUTuMNA3d wiZDrdDVlFjSqJEAWK532gGJEiKMx5c3xv230rjm0DaefOkDor2CaFyf1E/Ho54a6tOE +BABE5PKcRg8sSLOuPoOm2L7sbZf8pV1I6nPbyt8lNRuloW/jAnpJG3y/4Vzfaavnx6b p9CYLnI/n2lw7b2isksbnoFffW9DtVkYsGAT4bxQSwyrCGH0lR+yX1sx4EBjuzxZ2+Dn 51bQ== X-Gm-Message-State: AOAM532YbwGBg4Fc86JrxJJHE3g1+RWFw0VZovYTzqs05xOSrrdTo5gv n4a85KQYdkrNSaT/hoEcYVuDv55/te4= X-Google-Smtp-Source: ABdhPJyQYJ0x7OvSRpcYmAQ5BRWQd9bkmRh9jP0168EXXRbBHlQe+/VA1c8Ui0BDQ2o8LiZTwir9hfGFAMI= X-Received: from seanjc798194.pdx.corp.google.com ([2620:15c:90:200:4c72:89be:dba3:2bcb]) (user=seanjc job=sendgmr) by 2002:a05:6214:2ec:: with SMTP id h12mr13351238qvu.1.1632531361061; Fri, 24 Sep 2021 17:56:01 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 24 Sep 2021 17:55:28 -0700 In-Reply-To: <20210925005528.1145584-1-seanjc@google.com> Message-Id: <20210925005528.1145584-15-seanjc@google.com> Mime-Version: 1.0 References: <20210925005528.1145584-1-seanjc@google.com> X-Mailer: git-send-email 2.33.0.685.g46640cef36-goog Subject: [PATCH 14/14] KVM: x86: Invoke kvm_vcpu_block() directly for non-HALTED wait states From: Sean Christopherson To: Marc Zyngier , Huacai Chen , Aleksandar Markovic , Paul Mackerras , Christian Borntraeger , Janosch Frank , Paolo Bonzini Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , 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, linux-kernel@vger.kernel.org, David Matlack , 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. Signed-off-by: Sean Christopherson Reviewed-by: David Matlack --- 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 b444f9315766..a0f313c4bc49 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9893,7 +9893,10 @@ 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)