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 530ADC433F5 for ; Thu, 18 Nov 2021 07:45:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E60D61B04 for ; Thu, 18 Nov 2021 07:45:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243974AbhKRHsB (ORCPT ); Thu, 18 Nov 2021 02:48:01 -0500 Received: from smtp-out2.suse.de ([195.135.220.29]:52606 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244057AbhKRHrM (ORCPT ); Thu, 18 Nov 2021 02:47:12 -0500 Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 05CD91FD29; Thu, 18 Nov 2021 07:44:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1637221452; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=VivlK8luK1AvNEfo3RDyX0t7aR3Y6/ldzwb1M+i4xV8=; b=qNUu/zxCyojTC5Xd/kNV+X29kdCj7sjfba9deFv2Ok7WOuqtmjhlgX/dUzoCkRJH9GVDYP eaCAeHKCEUzbPOT78jUsmafRUpav0K9ycLhxgNF4MQ4YfG2IqUg3YE0IVMPk9VqE/Y84u7 uaO6npQDON0cpKjSIhilFYvv4Qm8wRA= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 7433D13CE6; Thu, 18 Nov 2021 07:44:11 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id biByGksElmHtQwAAMHmgww (envelope-from ); Thu, 18 Nov 2021 07:44:11 +0000 Subject: Re: [PATCH v3 1/4] x86/kvm: add boot parameter for adding vcpu-id bits To: Sean Christopherson Cc: kvm@vger.kernel.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Jonathan Corbet , Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" References: <20211116141054.17800-1-jgross@suse.com> <20211116141054.17800-2-jgross@suse.com> From: Juergen Gross Message-ID: <374d3255-4e6f-e8de-9ab5-709c4a3b4e63@suse.com> Date: Thu, 18 Nov 2021 08:44:10 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="oHanQA06vyEqo3Ev9ksBIp4414Sza82uS" Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --oHanQA06vyEqo3Ev9ksBIp4414Sza82uS Content-Type: multipart/mixed; boundary="i6134QYU2xtcYjtadLMZErrzEGVrYeISM"; protected-headers="v1" From: Juergen Gross To: Sean Christopherson Cc: kvm@vger.kernel.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Jonathan Corbet , Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" Message-ID: <374d3255-4e6f-e8de-9ab5-709c4a3b4e63@suse.com> Subject: Re: [PATCH v3 1/4] x86/kvm: add boot parameter for adding vcpu-id bits References: <20211116141054.17800-1-jgross@suse.com> <20211116141054.17800-2-jgross@suse.com> In-Reply-To: --i6134QYU2xtcYjtadLMZErrzEGVrYeISM Content-Type: multipart/mixed; boundary="------------15D4DA9DA748AB7EF14AAF73" Content-Language: en-US This is a multi-part message in MIME format. --------------15D4DA9DA748AB7EF14AAF73 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 18.11.21 00:44, Sean Christopherson wrote: > On Tue, Nov 16, 2021, Juergen Gross wrote: >> diff --git a/arch/x86/kvm/ioapic.c b/arch/x86/kvm/ioapic.c >> index 816a82515dcd..64ba9b1c8b3d 100644 >> --- a/arch/x86/kvm/ioapic.c >> +++ b/arch/x86/kvm/ioapic.c >> @@ -685,11 +685,21 @@ static const struct kvm_io_device_ops ioapic_mmi= o_ops =3D { >> int kvm_ioapic_init(struct kvm *kvm) >> { >> struct kvm_ioapic *ioapic; >> + size_t sz; >> int ret; >> =20 >> - ioapic =3D kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL_ACCOUNT); >> + sz =3D sizeof(struct kvm_ioapic) + >> + sizeof(*ioapic->rtc_status.dest_map.map) * >> + BITS_TO_LONGS(KVM_MAX_VCPU_IDS) + >> + sizeof(*ioapic->rtc_status.dest_map.vectors) * >> + (KVM_MAX_VCPU_IDS); >> + ioapic =3D kzalloc(sz, GFP_KERNEL_ACCOUNT); >> if (!ioapic) >> return -ENOMEM; >> + ioapic->rtc_status.dest_map.map =3D (void *)(ioapic + 1); >=20 > Oof. Just do separate allocations. I highly doubt the performance of = the > emulated RTC hinges on the spatial locality of the bitmap and array. T= he array > is going to end up in a second page for most configuration anyways. Okay, fine with me. 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