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 7D6B2C54EE9 for ; Tue, 13 Sep 2022 04:11:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229990AbiIMELP (ORCPT ); Tue, 13 Sep 2022 00:11:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229482AbiIMELN (ORCPT ); Tue, 13 Sep 2022 00:11:13 -0400 Received: from mail-wr1-x431.google.com (mail-wr1-x431.google.com [IPv6:2a00:1450:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 91D6C40E22 for ; Mon, 12 Sep 2022 21:11:12 -0700 (PDT) Received: by mail-wr1-x431.google.com with SMTP id k9so18794155wri.0 for ; Mon, 12 Sep 2022 21:11:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date; bh=CVbSa+/qoRHiRq48IgUS3irpZOjrJDEoYacMrNQAtOE=; b=duGTUBwr7IU1If9T6F9LAshp5l73d5fJ2R+vTkprg/tyemXx34dXvA88VvFZyHTyQV OU4kwDzMCnE8C2bPP8wNvZaseK7PfgYr2JKAnJfndUKXxG08+EzAr2kMl8ALl1PKs+ZD +cU0j1JloAUNmi9IEV/oByNE4fSEiLydbPjqHmfFFdxAnbBellfWTw6ABnaZav8Qu05N BCtKCViC4JngjL1jOevVvHhjvFUZqauiTwvq6itbHgECYm1CqDx9tOvQGXKfLy4lB+WG k+wYZZ2RGqbuRLqA8W9grIAOP6Zr8h/ahClTUNYHpkbeabfw69y8XAo/xCxvaait17OH 40Qg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date; bh=CVbSa+/qoRHiRq48IgUS3irpZOjrJDEoYacMrNQAtOE=; b=Bt2/wTWMhv4JjZoPlFN9TsfmTCPfXbOtKbF5qwvA95Y3dSv6dOsfKGJcIF/tGAdFJr ExAHQJNix0NXowKZeKuNPUB2t+J6u1JfzsyejS9nXgKKq8mPyBVf2ToErKZskD+fOFUD xREmC04sXU85J407HcsYWSnFxv1iySP8FliRdTsrs3iPnixDhGe0ivEjvIbIFFbgA/zP PHftGpmF5GqzNal168m9huUBApzSTQ/6gsuje/7azf12ZT2gzMQE4oDEx8BMazamy50d LEXcN28Fm6XOJeq4VdNQKXWuNvo5MjTSo/LkU7ukvctgf0KFVSePhe1kUnvgzrFrGQGm QXbQ== X-Gm-Message-State: ACgBeo1ykqOCQezja8EP2SWqlOJpJwMwNKq6P0pZaNDfilVIG6jYrmVy lquIYWQTY8wwJ57qKXXX9rp78EMSYpWB2qyOABj5UA== X-Google-Smtp-Source: AA6agR5gH2VCKDnM+Ue9zmgPKtM7MNJrX54DRWkE+hNVUsK6TWIw8+oDlVQ2ylRk9OAf5b10MjfzYxGJzELYkEt7dTw= X-Received: by 2002:adf:f54a:0:b0:228:951a:2949 with SMTP id j10-20020adff54a000000b00228951a2949mr16641246wrp.240.1663042271021; Mon, 12 Sep 2022 21:11:11 -0700 (PDT) MIME-Version: 1.0 References: <20220810193033.1090251-1-pcc@google.com> <20220810193033.1090251-7-pcc@google.com> <874jxcv9xn.wl-maz@kernel.org> In-Reply-To: <874jxcv9xn.wl-maz@kernel.org> From: Peter Collingbourne Date: Mon, 12 Sep 2022 21:10:59 -0700 Message-ID: Subject: Re: [PATCH v3 6/7] KVM: arm64: permit all VM_MTE_ALLOWED mappings with MTE enabled To: Marc Zyngier Cc: Linux ARM , kvmarm@lists.cs.columbia.edu, Cornelia Huck , Catalin Marinas , Will Deacon , Evgenii Stepanov , kvm@vger.kernel.org, Steven Price , Vincenzo Frascino Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Mon, Sep 12, 2022 at 9:23 AM Marc Zyngier wrote: > > On Wed, 10 Aug 2022 20:30:32 +0100, > Peter Collingbourne wrote: > > > > Certain VMMs such as crosvm have features (e.g. sandboxing) that depend > > on being able to map guest memory as MAP_SHARED. The current restriction > > on sharing MAP_SHARED pages with the guest is preventing the use of > > those features with MTE. Now that the races between tasks concurrently > > clearing tags on the same page have been fixed, remove this restriction. > > > > Signed-off-by: Peter Collingbourne > > --- > > arch/arm64/kvm/mmu.c | 8 -------- > > 1 file changed, 8 deletions(-) > > > > diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c > > index d54be80e31dd..fc65dc20655d 100644 > > --- a/arch/arm64/kvm/mmu.c > > +++ b/arch/arm64/kvm/mmu.c > > @@ -1075,14 +1075,6 @@ static void sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn, > > > > static bool kvm_vma_mte_allowed(struct vm_area_struct *vma) > > { > > - /* > > - * VM_SHARED mappings are not allowed with MTE to avoid races > > - * when updating the PG_mte_tagged page flag, see > > - * sanitise_mte_tags for more details. > > - */ > > - if (vma->vm_flags & VM_SHARED) > > - return false; > > - > > return vma->vm_flags & VM_MTE_ALLOWED; > > } > > > > Can you provide a pointer to some VMM making use of this functionality > and enabling MTE? A set of crosvm patches (for example) would be > useful to evaluate this series. Hi Marc, I've been using a modified crosvm to test this series. Please find below a link to the proposed crosvm patches which make use of the series: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3892141 Peter 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 mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by smtp.lore.kernel.org (Postfix) with ESMTP id B420FC6FA82 for ; Tue, 13 Sep 2022 04:11:16 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 1EA094BBF9; Tue, 13 Sep 2022 00:11:16 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3caF05G0P0e5; Tue, 13 Sep 2022 00:11:14 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id DC1EA4BBFB; Tue, 13 Sep 2022 00:11:14 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 7855D4BBF9 for ; Tue, 13 Sep 2022 00:11:13 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xeNIlInQpZCA for ; Tue, 13 Sep 2022 00:11:12 -0400 (EDT) Received: from mail-wr1-f44.google.com (mail-wr1-f44.google.com [209.85.221.44]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 2441D4BBF4 for ; Tue, 13 Sep 2022 00:11:12 -0400 (EDT) Received: by mail-wr1-f44.google.com with SMTP id k9so18794157wri.0 for ; Mon, 12 Sep 2022 21:11:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date; bh=CVbSa+/qoRHiRq48IgUS3irpZOjrJDEoYacMrNQAtOE=; b=duGTUBwr7IU1If9T6F9LAshp5l73d5fJ2R+vTkprg/tyemXx34dXvA88VvFZyHTyQV OU4kwDzMCnE8C2bPP8wNvZaseK7PfgYr2JKAnJfndUKXxG08+EzAr2kMl8ALl1PKs+ZD +cU0j1JloAUNmi9IEV/oByNE4fSEiLydbPjqHmfFFdxAnbBellfWTw6ABnaZav8Qu05N BCtKCViC4JngjL1jOevVvHhjvFUZqauiTwvq6itbHgECYm1CqDx9tOvQGXKfLy4lB+WG k+wYZZ2RGqbuRLqA8W9grIAOP6Zr8h/ahClTUNYHpkbeabfw69y8XAo/xCxvaait17OH 40Qg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date; bh=CVbSa+/qoRHiRq48IgUS3irpZOjrJDEoYacMrNQAtOE=; b=CuFrd/o0thrglA4nhAiAfu51GtLlSEwBL7aIGc7/+dnPcnFazD9wNV2XFr7L+dpBYc WE+qsoPwF4ovccnlanHQhLqsgpYSM/nA9eLzzCHLykME0gXntf7XJsv9r6Yqdmc0YBIy 3YL1lE91JD7Fk5x4IPQc7qTixHiLXgkoLtJ5Uq4Y1PagdlQhzQwjFVlnl9lGT5sWasVc 2zEzL8fUVFwjkrd9MerteMya2f7037vYFqfvjSCYhgtcN/shG+J9nykRU+rxKHlgb+XT bKlv4A8xk6asvnUrK/Gaj5t2lyKA2k8APFiAzLB2d17nmZXHvJ7jWkWmdMagwaLhOeaK RDgQ== X-Gm-Message-State: ACgBeo0gYegBs2n2lYqkqHiEAke+0VrkzAga2UC/aR3/MorRcl7OQzrX tx6c/Ysd/avDm8ywgXZUjxN41iTPSmZknUQyp5zH4w== X-Google-Smtp-Source: AA6agR5gH2VCKDnM+Ue9zmgPKtM7MNJrX54DRWkE+hNVUsK6TWIw8+oDlVQ2ylRk9OAf5b10MjfzYxGJzELYkEt7dTw= X-Received: by 2002:adf:f54a:0:b0:228:951a:2949 with SMTP id j10-20020adff54a000000b00228951a2949mr16641246wrp.240.1663042271021; Mon, 12 Sep 2022 21:11:11 -0700 (PDT) MIME-Version: 1.0 References: <20220810193033.1090251-1-pcc@google.com> <20220810193033.1090251-7-pcc@google.com> <874jxcv9xn.wl-maz@kernel.org> In-Reply-To: <874jxcv9xn.wl-maz@kernel.org> From: Peter Collingbourne Date: Mon, 12 Sep 2022 21:10:59 -0700 Message-ID: Subject: Re: [PATCH v3 6/7] KVM: arm64: permit all VM_MTE_ALLOWED mappings with MTE enabled To: Marc Zyngier Cc: kvm@vger.kernel.org, Catalin Marinas , Cornelia Huck , Steven Price , Linux ARM , Vincenzo Frascino , Will Deacon , kvmarm@lists.cs.columbia.edu, Evgenii Stepanov X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Mon, Sep 12, 2022 at 9:23 AM Marc Zyngier wrote: > > On Wed, 10 Aug 2022 20:30:32 +0100, > Peter Collingbourne wrote: > > > > Certain VMMs such as crosvm have features (e.g. sandboxing) that depend > > on being able to map guest memory as MAP_SHARED. The current restriction > > on sharing MAP_SHARED pages with the guest is preventing the use of > > those features with MTE. Now that the races between tasks concurrently > > clearing tags on the same page have been fixed, remove this restriction. > > > > Signed-off-by: Peter Collingbourne > > --- > > arch/arm64/kvm/mmu.c | 8 -------- > > 1 file changed, 8 deletions(-) > > > > diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c > > index d54be80e31dd..fc65dc20655d 100644 > > --- a/arch/arm64/kvm/mmu.c > > +++ b/arch/arm64/kvm/mmu.c > > @@ -1075,14 +1075,6 @@ static void sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn, > > > > static bool kvm_vma_mte_allowed(struct vm_area_struct *vma) > > { > > - /* > > - * VM_SHARED mappings are not allowed with MTE to avoid races > > - * when updating the PG_mte_tagged page flag, see > > - * sanitise_mte_tags for more details. > > - */ > > - if (vma->vm_flags & VM_SHARED) > > - return false; > > - > > return vma->vm_flags & VM_MTE_ALLOWED; > > } > > > > Can you provide a pointer to some VMM making use of this functionality > and enabling MTE? A set of crosvm patches (for example) would be > useful to evaluate this series. Hi Marc, I've been using a modified crosvm to test this series. Please find below a link to the proposed crosvm patches which make use of the series: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3892141 Peter _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3FBD3C54EE9 for ; Tue, 13 Sep 2022 04:12:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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Mon, 12 Sep 2022 21:11:11 -0700 (PDT) MIME-Version: 1.0 References: <20220810193033.1090251-1-pcc@google.com> <20220810193033.1090251-7-pcc@google.com> <874jxcv9xn.wl-maz@kernel.org> In-Reply-To: <874jxcv9xn.wl-maz@kernel.org> From: Peter Collingbourne Date: Mon, 12 Sep 2022 21:10:59 -0700 Message-ID: Subject: Re: [PATCH v3 6/7] KVM: arm64: permit all VM_MTE_ALLOWED mappings with MTE enabled To: Marc Zyngier Cc: Linux ARM , kvmarm@lists.cs.columbia.edu, Cornelia Huck , Catalin Marinas , Will Deacon , Evgenii Stepanov , kvm@vger.kernel.org, Steven Price , Vincenzo Frascino X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220912_211114_776148_6712472E X-CRM114-Status: GOOD ( 26.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Sep 12, 2022 at 9:23 AM Marc Zyngier wrote: > > On Wed, 10 Aug 2022 20:30:32 +0100, > Peter Collingbourne wrote: > > > > Certain VMMs such as crosvm have features (e.g. sandboxing) that depend > > on being able to map guest memory as MAP_SHARED. The current restriction > > on sharing MAP_SHARED pages with the guest is preventing the use of > > those features with MTE. Now that the races between tasks concurrently > > clearing tags on the same page have been fixed, remove this restriction. > > > > Signed-off-by: Peter Collingbourne > > --- > > arch/arm64/kvm/mmu.c | 8 -------- > > 1 file changed, 8 deletions(-) > > > > diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c > > index d54be80e31dd..fc65dc20655d 100644 > > --- a/arch/arm64/kvm/mmu.c > > +++ b/arch/arm64/kvm/mmu.c > > @@ -1075,14 +1075,6 @@ static void sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn, > > > > static bool kvm_vma_mte_allowed(struct vm_area_struct *vma) > > { > > - /* > > - * VM_SHARED mappings are not allowed with MTE to avoid races > > - * when updating the PG_mte_tagged page flag, see > > - * sanitise_mte_tags for more details. > > - */ > > - if (vma->vm_flags & VM_SHARED) > > - return false; > > - > > return vma->vm_flags & VM_MTE_ALLOWED; > > } > > > > Can you provide a pointer to some VMM making use of this functionality > and enabling MTE? A set of crosvm patches (for example) would be > useful to evaluate this series. Hi Marc, I've been using a modified crosvm to test this series. Please find below a link to the proposed crosvm patches which make use of the series: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3892141 Peter _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel