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 X-Spam-Level: X-Spam-Status: No, score=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2110C433FE for ; Sun, 12 Sep 2021 10:50:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 879DC61213 for ; Sun, 12 Sep 2021 10:50:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233439AbhILKuu (ORCPT ); Sun, 12 Sep 2021 06:50:50 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:37485 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229635AbhILKus (ORCPT ); Sun, 12 Sep 2021 06:50:48 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1631443774; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=VlVv06mE5W7NWyznLz/NOTF3NqAx+EBDkVQ/LY3IlHQ=; b=G/ISI2L2kRAIRFRlmZdieny3NXvUKYWJUuxQ+KyhPy5iDRl+a9bG8/nzF2HMuVM4CNPVhR mMhMbX4PoUECkeoIB3WBhF8VcYVrrXXVo8IS8s2KZzinDp7iBB90SKml8CtaUmCVcAAzeg XiV2fvWMJ2uNUrHhaAdmMmJ2m+YHe/o= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-387-n7dthmQUNj-IEtHfzXg7Pg-1; Sun, 12 Sep 2021 06:49:33 -0400 X-MC-Unique: n7dthmQUNj-IEtHfzXg7Pg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E73AC1006AA0; Sun, 12 Sep 2021 10:49:31 +0000 (UTC) Received: from starship (unknown [10.35.206.50]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9B5F65C25A; Sun, 12 Sep 2021 10:49:29 +0000 (UTC) Message-ID: <30f1a856342bc0a45f92558923f9dc22ba453a8b.camel@redhat.com> Subject: Re: [PATCH 1/2] KVM: x86: Query vcpu->vcpu_idx directly and drop its accessor From: Maxim Levitsky To: Sean Christopherson , Paolo Bonzini Cc: Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Date: Sun, 12 Sep 2021 13:49:28 +0300 In-Reply-To: <20210910183220.2397812-2-seanjc@google.com> References: <20210910183220.2397812-1-seanjc@google.com> <20210910183220.2397812-2-seanjc@google.com> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.36.5 (3.36.5-2.fc32) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2021-09-10 at 11:32 -0700, Sean Christopherson wrote: > Read vcpu->vcpu_idx directly instead of bouncing through the one-line > wrapper, kvm_vcpu_get_idx(), and drop the wrapper. The wrapper is a > remnant of the original implementation and serves no purpose; remove it > before it gains more users. > > Back when kvm_vcpu_get_idx() was added by commit 497d72d80a78 ("KVM: Add > kvm_vcpu_get_idx to get vcpu index in kvm->vcpus"), the implementation > was more than just a simple wrapper as vcpu->vcpu_idx did not exist and > retrieving the index meant walking over the vCPU array to find the given > vCPU. > > When vcpu_idx was introduced by commit 8750e72a79dd ("KVM: remember > position in kvm->vcpus array"), the helper was left behind, likely to > avoid extra thrash (but even then there were only two users, the original > arm usage having been removed at some point in the past). > > No functional change intended. > > Suggested-by: Vitaly Kuznetsov > Signed-off-by: Sean Christopherson > --- > arch/x86/kvm/hyperv.c | 7 +++---- > arch/x86/kvm/hyperv.h | 2 +- > include/linux/kvm_host.h | 5 ----- > 3 files changed, 4 insertions(+), 10 deletions(-) > > diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c > index fe4a02715266..04dbc001f4fc 100644 > --- a/arch/x86/kvm/hyperv.c > +++ b/arch/x86/kvm/hyperv.c > @@ -939,7 +939,7 @@ static int kvm_hv_vcpu_init(struct kvm_vcpu *vcpu) > for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++) > stimer_init(&hv_vcpu->stimer[i], i); > > - hv_vcpu->vp_index = kvm_vcpu_get_idx(vcpu); > + hv_vcpu->vp_index = vcpu->vcpu_idx; > > return 0; > } > @@ -1444,7 +1444,6 @@ static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) > switch (msr) { > case HV_X64_MSR_VP_INDEX: { > struct kvm_hv *hv = to_kvm_hv(vcpu->kvm); > - int vcpu_idx = kvm_vcpu_get_idx(vcpu); > u32 new_vp_index = (u32)data; > > if (!host || new_vp_index >= KVM_MAX_VCPUS) > @@ -1459,9 +1458,9 @@ static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) > * VP index is changing, adjust num_mismatched_vp_indexes if > * it now matches or no longer matches vcpu_idx. > */ > - if (hv_vcpu->vp_index == vcpu_idx) > + if (hv_vcpu->vp_index == vcpu->vcpu_idx) > atomic_inc(&hv->num_mismatched_vp_indexes); > - else if (new_vp_index == vcpu_idx) > + else if (new_vp_index == vcpu->vcpu_idx) > atomic_dec(&hv->num_mismatched_vp_indexes); > > hv_vcpu->vp_index = new_vp_index; > diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h > index 730da8537d05..ed1c4e546d04 100644 > --- a/arch/x86/kvm/hyperv.h > +++ b/arch/x86/kvm/hyperv.h > @@ -83,7 +83,7 @@ static inline u32 kvm_hv_get_vpindex(struct kvm_vcpu *vcpu) > { > struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); > > - return hv_vcpu ? hv_vcpu->vp_index : kvm_vcpu_get_idx(vcpu); > + return hv_vcpu ? hv_vcpu->vp_index : vcpu->vcpu_idx; > } > > int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host); > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > index e4d712e9f760..31071ad821e2 100644 > --- a/include/linux/kvm_host.h > +++ b/include/linux/kvm_host.h > @@ -721,11 +721,6 @@ static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id) > return NULL; > } > > -static inline int kvm_vcpu_get_idx(struct kvm_vcpu *vcpu) > -{ > - return vcpu->vcpu_idx; > -} > - > #define kvm_for_each_memslot(memslot, slots) \ > for (memslot = &slots->memslots[0]; \ > memslot < slots->memslots + slots->used_slots; memslot++) \ Reviewed-by: Maxim Levitsky Best regards, Maxim Levitsky