From nobody Tue Nov 5 10:36:14 2024 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 60CB9C25B48 for ; Fri, 27 Oct 2023 18:23:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346436AbjJ0SXT (ORCPT ); Fri, 27 Oct 2023 14:23:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45672 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235052AbjJ0SWu (ORCPT ); Fri, 27 Oct 2023 14:22:50 -0400 Received: from mail-pl1-x649.google.com (mail-pl1-x649.google.com [IPv6:2607:f8b0:4864:20::649]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F0337D43 for ; Fri, 27 Oct 2023 11:22:37 -0700 (PDT) Received: by mail-pl1-x649.google.com with SMTP id d9443c01a7336-1caaaa873efso23349725ad.3 for ; Fri, 27 Oct 2023 11:22:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1698430957; x=1699035757; 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=srqr8yeDZlFrvxNrVECKE5xxuDvV2cb3J0BOKhehVs4=; b=0U1zSTSjnA3BRqEUsHqQ22gj/v+L0Zoy521THY4PBak+iDWT10zt5AKWMazO6galHQ U9MgstUWrVea2OJPPklBLMEOedu4md8jhyAnAb3fkx1Btm2UvqMz52WOKhIKjerUzFH/ EbIHiAeDlUejd0qX5hJpeOX0Sw//UZLki0+o9owPDvyejNmO+buU3e4WZ2ej2RyolcMb DTKC2FItAczUC+gTOifCKo0+jD2aE4Y5PHzHksb94Vzyayf0HrecBtPy0ALIdRGvtkyk oxZMV2LjEMy3Rvvp4lOLmpdIX0UFyfnD5X6RUhN4zE8mS0mnSVSh24TQ2v8r5fbkipSs 1+OA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698430957; x=1699035757; 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=srqr8yeDZlFrvxNrVECKE5xxuDvV2cb3J0BOKhehVs4=; b=JwKCT8xmdrmpvDWtMoXVWpVbPFouawi1g4l7+Tyu1B5DpZMoCdu8wLAWELLnzG7i0C OKPi1WZZ27g8sb76jbWk/1HXii9VrKQ+We3urMGGMOw8hwUIFR0R3ra6IG0GpIOqTutw 29my3xH2I/mTzTzW/IXA+5dsiiB009eUPGFdJdbJdk+l06EirPQDMBWvBwE/qQs6Ykm0 FZFHn9l3yvQEdabn8dIUYfv6pmK82VhVm55hhnh8ois+X0jtukzXvOT3S5DZMZsxU+3j MvT0YaJP3n5uLT2ZOkISuEVeYd4IyGbc45rtIO7dKKBIKqi62aQtZ76L3ymEo6FD0vp9 zqMg== X-Gm-Message-State: AOJu0Ywl+j2QE2TRhsoDKXYUa+FRnztobSPPgxXjAO7naalGvfPe8Vaa wxA89fq/o3DFTwWD/v2Gg0F++t0+l/w= X-Google-Smtp-Source: AGHT+IEgJpE7SXSukSyCmrL3MrLSyvY8980C5XITIQh/pYBdmOorR/VvmfyRxJnTS7i/xC9oBoneiM7iOr4= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:903:446:b0:1ca:2620:78ad with SMTP id iw6-20020a170903044600b001ca262078admr60815plb.8.1698430957451; Fri, 27 Oct 2023 11:22:37 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 27 Oct 2023 11:21:48 -0700 In-Reply-To: <20231027182217.3615211-1-seanjc@google.com> Mime-Version: 1.0 References: <20231027182217.3615211-1-seanjc@google.com> X-Mailer: git-send-email 2.42.0.820.g83a721a137-goog Message-ID: <20231027182217.3615211-7-seanjc@google.com> Subject: [PATCH v13 06/35] 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 , Alexander Viro , Christian Brauner , "Matthew Wilcox (Oracle)" , Andrew Morton 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-kernel@vger.kernel.org, Xiaoyao Li , Xu Yilun , Chao Peng , Fuad Tabba , Jarkko Sakkinen , Anish Moorthy , David Matlack , Yu Zhang , Isaku Yamahata , "=?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?=" , 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-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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=3Dy 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=3Dn and CONFIG_KVM_BOOK3S_PR_POSSIBLE=3Dy, i.e. KVM already advertises a synchronized MMU for PR VMs, just not when CONFIG_KVM_BOOK3S_HV_POSSIBLE=3D= 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 =3D hv_enabled; -#else r =3D 1; -#endif break; #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE case KVM_CAP_PPC_HTAB_FD: --=20 2.42.0.820.g83a721a137-goog