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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D14D2C433EF for ; Mon, 28 Mar 2022 14:53:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244101AbiC1Oyo (ORCPT ); Mon, 28 Mar 2022 10:54:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37036 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240562AbiC1Oym (ORCPT ); Mon, 28 Mar 2022 10:54:42 -0400 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 689115DE50 for ; Mon, 28 Mar 2022 07:53:01 -0700 (PDT) Received: by mail-pj1-x102f.google.com with SMTP id p4-20020a17090ad30400b001c7ca87c05bso10176266pju.1 for ; Mon, 28 Mar 2022 07:53:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=szL7lceaP/NxR0+lC2cN5AaRzpZIx1sqZ2iEfehaPgU=; b=dWoW0WSt+vofTr+ILF/HwHxImbE9tGNhavUUeWUHY4WvJIuRkKIJBouTRGpch6aByh BOCESJWtyC9Iu76Ajmq58cWmG3JORjH1N3DUNyraC9UHpqtMgq5J0B7YvvIwCiB4qSuq 43EA1b7BzZ2gstsbw3w8peW/pUMClebmhupAU6Is6uLzwHPCvvmMNApimCrwyzdm/Ogc mRYGeomM5FLr79ZfvojBlNJCv+Y03N/h38wNank/TQ/Bgl3Zpp+EdIMaiOjSkX9MRwim EKf9jK+/Xhy0XPU89tIm71stvekDcCJDBojjObxOlzFtX+2WvswVa86Asj04kDqvnjXi Yq6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=szL7lceaP/NxR0+lC2cN5AaRzpZIx1sqZ2iEfehaPgU=; b=QHZypsh/Z1/d+H8dHG6eHDQSPSTiNWlHg1FeJHcSrwqXQPilkUMUO4zw8GtgPPqCh4 SZROZfJpDNVzZCYDzm6oEPVZSleLOOhWuJ4onXe7wA949ma8hMT5kHiUd6/hqKbrsXuf GpobjCobsCGAK2L7ZsIFiSxDLxR6lTclcIEjCv09pgEirTL3rv9Ylfi+krxGBJnncDCt sa6s39IzbMRMUS5RtapQiLd6vbx6IBY3BY8I4tK4qkCrDXeNG0Udx+D22IOHdQx2kqhf jX7QXLKY3TEGlb0sQEDsm5LWFkr+FoLaoHC0EC/EKxx80lfUvd9iB9uUt+/pkm7RbdtF qqNw== X-Gm-Message-State: AOAM532M1kfWyGuhmgXU3Ev4IAUnKSH5QImsTk6POMA2LbJuPa+uEOeU 9jA+IeapyLFGybJkxvoTyJIm7A== X-Google-Smtp-Source: ABdhPJyIClNMv5o0NWmY1p1hSJAbH+a7bM/zRuKCdQmA7b/Y9V8XkwNQyyrDzOcaszKj/ka4JXU7Gg== X-Received: by 2002:a17:90b:f82:b0:1c6:58b9:bd36 with SMTP id ft2-20020a17090b0f8200b001c658b9bd36mr41688643pjb.141.1648479180804; Mon, 28 Mar 2022 07:53:00 -0700 (PDT) Received: from google.com (157.214.185.35.bc.googleusercontent.com. [35.185.214.157]) by smtp.gmail.com with ESMTPSA id a16-20020a637050000000b00385f92b13d1sm13066121pgn.43.2022.03.28.07.52.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Mar 2022 07:53:00 -0700 (PDT) Date: Mon, 28 Mar 2022 14:52:56 +0000 From: Sean Christopherson To: Vitaly Kuznetsov Cc: Paolo Bonzini , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Ben Gardon Subject: Re: [PATCH] KVM: x86/mmu: Zap only TDP MMU leafs in zap range and mmu_notifier unmap Message-ID: References: <20220325230348.2587437-1-seanjc@google.com> <87lewuo4ge.fsf@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87lewuo4ge.fsf@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 28, 2022, Vitaly Kuznetsov wrote: > Sean Christopherson writes: > > > Re-introduce zapping only leaf SPTEs in kvm_zap_gfn_range() and > > kvm_tdp_mmu_unmap_gfn_range(), this time without losing a pending TLB > > flush when processing multiple roots (including nested TDP shadow roots). > > Dropping the TLB flush resulted in random crashes when running Hyper-V > > Server 2019 in a guest with KSM enabled in the host (or any source of > > mmu_notifier invalidations, KSM is just the easiest to force). > > > > This effectively revert commits 873dd122172f8cce329113cfb0dfe3d2344d80c0 > > and fcb93eb6d09dd302cbef22bd95a5858af75e4156, and thus restores commit > > cf3e26427c08ad9015956293ab389004ac6a338e, plus this delta on top: > > > > bool kvm_tdp_mmu_zap_leafs(struct kvm *kvm, int as_id, gfn_t start, gfn_t end, > > struct kvm_mmu_page *root; > > > > for_each_tdp_mmu_root_yield_safe(kvm, root, as_id) > > - flush = tdp_mmu_zap_leafs(kvm, root, start, end, can_yield, false); > > + flush = tdp_mmu_zap_leafs(kvm, root, start, end, can_yield, flush); > > > > return flush; > > } > > > > I confirm this fixes the issue I was seeing, thanks! > > Tested-by: Vitaly Kuznetsov Phew! I think I would have cried were that not the case :-) Thanks for testing!