From patchwork Thu Sep 14 01:55:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 13383994 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 A75CCCA553D for ; Thu, 14 Sep 2023 01:56:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234077AbjINB4V (ORCPT ); Wed, 13 Sep 2023 21:56:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60716 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234152AbjINB4B (ORCPT ); Wed, 13 Sep 2023 21:56:01 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE7A5210E for ; Wed, 13 Sep 2023 18:55:44 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-d7e8e12df78so539514276.3 for ; Wed, 13 Sep 2023 18:55:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1694656544; x=1695261344; 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=5olfKKfAgOBEIWorNeGA6oMvbpwHV/k+KeYKQRUdq04=; b=bdIMT7k5UpwL0z+XvScHcf9jpYN5+dVi5xzFu2O9MWIMM32oAqzM4KN8XykaM16YUY YzvZruztiA1/vZf9OVN4agBdyBZdVJTRdZsLki+sc0NJ/iTeGg4HJx7Fz5o4p9z1qrMH sNAU5f5GrWFx3jgKckDFayc2lvRg3R08qo7wl+R40CLvXsPK0E9+KoamWo7PO3XnEmjc jNgIPGBPFoX5C5cWybiYlObLpUam/IHDObmiBrAQsWahbH1j0lv6H5AmJbhXuP6FVAqQ vP/oeOfpaTVLYk9IHWTWHxkne3AuKTv2FkpHSLunQI9BfcDIgV8bYjVSJcTg5zFk3CTb 0yYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694656544; x=1695261344; 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=5olfKKfAgOBEIWorNeGA6oMvbpwHV/k+KeYKQRUdq04=; b=MnLVyd+DKCf/RzjJ6D3hyTfXC+f6Qn3uHebXzRslfB010IagKC5Y/j0+JQ9lm1Ys/U pNTD7M4qXl6US7YkozqMz4zHwCLD55zDwCjELzVxBgdW9/n6dmPNDlAgEGCLCGDjrhL0 MJiAIEQA5sQ8jvRhEDuKYim24NlgO9HKO8yKSWdc5p2IV6a0KJvMwpp3hE5fZtelYHjf 5Jnng/M15TDIwfwCZuGPuJe1tJt6Sb+Vswwihw3Ok09fRCE7/f+vUyboZKf4zqQ8hlbQ naHePIKlQSLZCMon4ZkEM+a1URjpKWXhrhp/AQPps8h+ZvtzI0snMYSQMnMq5+D8jY6i whOQ== X-Gm-Message-State: AOJu0YzzmCSfO8WyW0HTdh2QlGwdHwuB2tVu8HH5+WZs01PHldFknGfC YWZ02AJ9N7gfn8kyWybl3rzcOUPK+JA= X-Google-Smtp-Source: AGHT+IFAWDIKY3pID0CrDZgtjj2bXptPteu0k42w51y6Ps+oH46knUj2OnzhEQTEbd0IbAu5MzXei5K4JBI= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6902:684:b0:d81:8e4d:b681 with SMTP id i4-20020a056902068400b00d818e4db681mr15248ybt.12.1694656543919; Wed, 13 Sep 2023 18:55:43 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 13 Sep 2023 18:55:02 -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: <20230914015531.1419405-5-seanjc@google.com> Subject: [RFC PATCH v12 04/33] KVM: PPC: Return '1' unconditionally for KVM_CAP_SYNC_MMU 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 Advertise that KVM's MMU is synchronized with the primary MMU for all flavors of PPC KVM support, i.e. advertise that the MMU is synchronized when CONFIG_KVM_BOOK3S_HV_POSSIBLE=y but the VM is not using hypervisor mode (a.k.a. PR VMs). PR VMs, via kvm_unmap_gfn_range_pr(), do the right thing for mmu_notifier invalidation events, and more tellingly, KVM returns '1' for KVM_CAP_SYNC_MMU when CONFIG_KVM_BOOK3S_HV_POSSIBLE=n and CONFIG_KVM_BOOK3S_PR_POSSIBLE=y, i.e. KVM already advertises a synchronized MMU for PR VMs, just not when CONFIG_KVM_BOOK3S_HV_POSSIBLE=y. Suggested-by: Paolo Bonzini Signed-off-by: Sean Christopherson --- arch/powerpc/kvm/powerpc.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index b0a512ede764..8d3ec483bc2b 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -635,11 +635,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) #if !defined(CONFIG_MMU_NOTIFIER) || !defined(KVM_ARCH_WANT_MMU_NOTIFIER) BUILD_BUG(); #endif -#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE - r = hv_enabled; -#else r = 1; -#endif break; #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE case KVM_CAP_PPC_HTAB_FD: