From patchwork Thu Sep 14 01:55:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 13383991 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 D53A5EE021F for ; Thu, 14 Sep 2023 01:56:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233954AbjINB4U (ORCPT ); Wed, 13 Sep 2023 21:56:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233549AbjINB4A (ORCPT ); Wed, 13 Sep 2023 21:56:00 -0400 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D7E3E2103 for ; Wed, 13 Sep 2023 18:55:42 -0700 (PDT) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-58cb845f2f2so6170947b3.1 for ; Wed, 13 Sep 2023 18:55:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1694656542; x=1695261342; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=ipMZPiP5QxzJYr8+L2XHaFOQ2agfNk5lTTsPLIZe0Eo=; b=IYqzzwJlcplJX/r3J2tz2Ie0U2pJa6yJcoFIB2mB3qtz8aNbHRzP/mQbr+c1Q4EAD9 WzQ6HwL6/29VikUHsAqcBLdxf2EvUtO2LVzfI30VLqUj3j6/z36Z3ki3tYTVTuWVQ0JX eQqYMl9YiacRKgBEVR+bHlHlUvWTxHAcMvGXmw0pOgmG2GxWIOR2hFPo4S5hUmw4jhhF X0k81+npQ2v0TL4UTz84eaHb9zta3wNn+5IKYz4udxRG0wLrqCUIWlM37rOk87V68NqQ ZN4axMlE4i8JIPbNMc00N0jXXDwV7FgxAcYSAueGtP0VB/6fETCF571k696jITYuJl5D ovqw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694656542; x=1695261342; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=ipMZPiP5QxzJYr8+L2XHaFOQ2agfNk5lTTsPLIZe0Eo=; b=Yzptk7vFHOWk92KZmPuHdnY9mVutLrRcj1o/U6vKZr+BDXlnGcDpqyFJvznj0gVUAB BMxqAwhtItoJA65lDsk7MvXDw39rRYjuRcwX6xGbrNssqSss7YijJPlafn6INvVZQOvR obmoX0mABJq0oLxhj2x1rgc6VyG2yVbgvbW55RfvFd2+wxuM0s07dT7mzcPsiUMliFa3 uk9+VxtAtQEnw91ps8e9D+ZDWty4dIWM54EMHBMQnIiq/tcejDB2yhl3XXx8YGuYDN0U mgkyKhgeNkn9FKg3ZIR7k2p7ic0q/0rTe7fxb42Vcio02rjWRyxXlPRdHZLKY3IySWId Yu/A== X-Gm-Message-State: AOJu0YxG0zw7inNWZyDlRBZgv8jOu/4pmnwfc2vTnOgkiF+ulxWnhc+S lrgeM0MFFhQ7NbGuOEf9XBH5+XGrxqA= X-Google-Smtp-Source: AGHT+IHZ9maMkZbk/mDeS4QG3cCYdpuky8EXqvBvcYXtjkjg3bX1mPxWKIK7RZclMdxYQ1SdoMO1l2xcItw= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:690c:b0a:b0:59b:ebe0:9fd6 with SMTP id cj10-20020a05690c0b0a00b0059bebe09fd6mr14465ywb.6.1694656542028; Wed, 13 Sep 2023 18:55:42 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 13 Sep 2023 18:55:01 -0700 In-Reply-To: <20230914015531.1419405-1-seanjc@google.com> Mime-Version: 1.0 References: <20230914015531.1419405-1-seanjc@google.com> X-Mailer: git-send-email 2.42.0.283.g2d96d420d3-goog Message-ID: <20230914015531.1419405-4-seanjc@google.com> Subject: [RFC PATCH v12 03/33] KVM: PPC: Drop dead code related to KVM_ARCH_WANT_MMU_NOTIFIER From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Sean Christopherson , "Matthew Wilcox (Oracle)" , Andrew Morton , Paul Moore , James Morris , "Serge E. Hallyn" Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Chao Peng , Fuad Tabba , Jarkko Sakkinen , Anish Moorthy , Yu Zhang , Isaku Yamahata , Xu Yilun , Vlastimil Babka , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata , "Kirill A . Shutemov" Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Assert that both KVM_ARCH_WANT_MMU_NOTIFIER and CONFIG_MMU_NOTIFIER are defined when KVM is enabled, and return '1' unconditionally for the CONFIG_KVM_BOOK3S_HV_POSSIBLE=n path. All flavors of PPC support for KVM select MMU_NOTIFIER, and KVM_ARCH_WANT_MMU_NOTIFIER is unconditionally defined by arch/powerpc/include/asm/kvm_host.h. Effectively dropping use of KVM_ARCH_WANT_MMU_NOTIFIER will simplify a future cleanup to turn KVM_ARCH_WANT_MMU_NOTIFIER into a Kconfig, i.e. will allow combining all of the #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) checks into a single #ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER without having to worry about PPC's "bare" usage of KVM_ARCH_WANT_MMU_NOTIFIER. Signed-off-by: Sean Christopherson --- arch/powerpc/kvm/powerpc.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 7197c8256668..b0a512ede764 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -632,12 +632,13 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) break; #endif case KVM_CAP_SYNC_MMU: +#if !defined(CONFIG_MMU_NOTIFIER) || !defined(KVM_ARCH_WANT_MMU_NOTIFIER) + BUILD_BUG(); +#endif #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE r = hv_enabled; -#elif defined(KVM_ARCH_WANT_MMU_NOTIFIER) - r = 1; #else - r = 0; + r = 1; #endif break; #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE