From nobody Wed Apr 8 03:08:39 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0419FFA374C for ; Fri, 21 Oct 2022 15:37:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231166AbiJUPhg (ORCPT ); Fri, 21 Oct 2022 11:37:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45894 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230525AbiJUPgd (ORCPT ); Fri, 21 Oct 2022 11:36:33 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F94B26FFA6 for ; Fri, 21 Oct 2022 08:36:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1666366574; 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=q6JUcvd7rUTLYCkZFxWav9wQftZedWongFynsO4NJOQ=; b=TA5E9LMgMIzLk/ExRxzggJnRKKVL0Z29wH8dZXOMoKMKyqcTR/clAbBm14bE7cJJ029fVO SdKsUFqn2o826HF9EWFev32ZMFJkRvDWO4HhEJrtOqVhqRWtZlvbkwQULfqDcpZliuHa/f TSxAU6mkVdS7/tSMnIsYZb0WLpDUn2c= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-400-OHBnGn91P3aYw2Q2cPJJLg-1; Fri, 21 Oct 2022 11:36:04 -0400 X-MC-Unique: OHBnGn91P3aYw2Q2cPJJLg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 302C83C1E730; Fri, 21 Oct 2022 15:36:04 +0000 (UTC) Received: from ovpn-192-65.brq.redhat.com (ovpn-192-65.brq.redhat.com [10.40.192.65]) by smtp.corp.redhat.com (Postfix) with ESMTP id 118FF40CA41F; Fri, 21 Oct 2022 15:36:01 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini , Sean Christopherson Cc: Wanpeng Li , Jim Mattson , Michael Kelley , Siddharth Chandrasekaran , Yuan Yao , Maxim Levitsky , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v12 15/46] KVM: x86: hyper-v: Use HV_MAX_SPARSE_VCPU_BANKS/HV_VCPUS_PER_SPARSE_BANK instead of raw '64' Date: Fri, 21 Oct 2022 17:34:50 +0200 Message-Id: <20221021153521.1216911-16-vkuznets@redhat.com> In-Reply-To: <20221021153521.1216911-1-vkuznets@redhat.com> References: <20221021153521.1216911-1-vkuznets@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" It may not be clear from where the '64' limit for the maximum sparse bank number comes from, use HV_MAX_SPARSE_VCPU_BANKS define instead. Use HV_VCPUS_PER_SPARSE_BANK in KVM_HV_MAX_SPARSE_VCPU_SET_BITS's definition. Opportunistically adjust the comment around BUILD_BUG_ON(). No functional change. Reviewed-by: Maxim Levitsky Suggested-by: Sean Christopherson Signed-off-by: Vitaly Kuznetsov --- arch/x86/kvm/hyperv.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index df1efb821eb0..df9f9aeedc7c 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -40,7 +40,7 @@ #include "irq.h" #include "fpu.h" =20 -#define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, 64) +#define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, HV_VCP= US_PER_SPARSE_BANK) =20 static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer, bool vcpu_kick); @@ -1793,7 +1793,7 @@ static u64 kvm_get_sparse_vp_set(struct kvm *kvm, str= uct kvm_hv_hcall *hc, u64 *sparse_banks, int consumed_xmm_halves, gpa_t offset) { - if (hc->var_cnt > 64) + if (hc->var_cnt > HV_MAX_SPARSE_VCPU_BANKS) return -EINVAL; =20 /* Cap var_cnt to ignore banks that cannot contain a legal VP index. */ @@ -1902,12 +1902,11 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, = struct kvm_hv_hcall *hc) gpa_t data_offset; =20 /* - * The Hyper-V TLFS doesn't allow more than 64 sparse banks, e.g. the - * valid mask is a u64. Fail the build if KVM's max allowed number of - * vCPUs (>4096) would exceed this limit, KVM will additional changes - * for Hyper-V support to avoid setting the guest up to fail. + * The Hyper-V TLFS doesn't allow more than HV_MAX_SPARSE_VCPU_BANKS + * sparse banks. Fail the build if KVM's max allowed number of + * vCPUs (>4096) exceeds this limit. */ - BUILD_BUG_ON(KVM_HV_MAX_SPARSE_VCPU_SET_BITS > 64); + BUILD_BUG_ON(KVM_HV_MAX_SPARSE_VCPU_SET_BITS > HV_MAX_SPARSE_VCPU_BANKS); =20 if (!hc->fast && is_guest_mode(vcpu)) { hc->ingpa =3D translate_nested_gpa(vcpu, hc->ingpa, 0, NULL); --=20 2.37.3