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 1AD06C433F5 for ; Tue, 30 Nov 2021 11:11:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237292AbhK3LOw (ORCPT ); Tue, 30 Nov 2021 06:14:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37024 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237272AbhK3LOv (ORCPT ); Tue, 30 Nov 2021 06:14:51 -0500 Received: from mail-ed1-x52b.google.com (mail-ed1-x52b.google.com [IPv6:2a00:1450:4864:20::52b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 47445C061574 for ; Tue, 30 Nov 2021 03:11:32 -0800 (PST) Received: by mail-ed1-x52b.google.com with SMTP id w1so85343603edc.6 for ; Tue, 30 Nov 2021 03:11:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=/H+LuZX1fGHm+fCq0wcDJ9/wPnRpWO7dTxByyfOKwzU=; b=VfsaplV463eXjZF6zSATmw/mIHOJ73Y1elA6nPCx2myvHSvr4qrQQ2XwTEYfmIt0rZ o19u3zHa5zL0KlZUnH53jmrynuk/N8TZAMbuAjQNUAzwevVGdx47m52DZ2kZT+JMO/0t rlC4E+D9oPO1+yYScWUma4YYoiAKfiuH5a6j7GC5rnLUD+YB0JNqwS+/Te3NpDNE4Iv6 BXPxC/AafhlxZKwK1FWm1+eGhj1QZe8YtnjMLdlZC0sq5D1isVGXke3Ree+FKeQZtyjg eQDRY1pz+evWipEtS6Y0wPYy6RZegvDz1KXrATdNN3N+UkweD2Kbj8//cDeEOMuahdth 2AjQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:message-id:date:mime-version:user-agent :subject:content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=/H+LuZX1fGHm+fCq0wcDJ9/wPnRpWO7dTxByyfOKwzU=; b=pmOwiAV9GQMXM6ZcZmfq6lUrtXo5MsneELxYSpRHDh8SDeeGc19WoM1yAGzuYkEi13 s379EXqndiQd6rok2iPzd/Km4KniTPh5yfbhXcoUSLvBT+7wLql9yKKsYDHLH/MNcsIj ho81V/vcz1g/vsrrCzWDB2IypsaGA/I+jYqlob5ylzxRcaGIjo3tDtI3HYYz8gyaUtma KetAwyY69kYKCmSzJzvA4T7d9A8ZQbc0ovNApCRG6PujHCfNh6t2mpzrPMd99ocLyQ+I Wy/iWc2L/rRQuwF2XE7LN8LzWCn/8neYbVWcJTsdJWLBPaQeV4nQDtSSfEM3flYpJfBd JKLg== X-Gm-Message-State: AOAM533guhQuFU9DHWXXY7KXqDwXwhKlrvP0t2IKVetR1HMINUgnT3GO D67dwJbTRUdkS0jBFSDk0T4= X-Google-Smtp-Source: ABdhPJyLZzac+dmwZQjHjDY/jCtn62rNj9rDZEYlcvWig4UFwc06i7GCZ8vAnbSSjx+rI5QhyMsP3w== X-Received: by 2002:a05:6402:4248:: with SMTP id g8mr82955342edb.182.1638270690922; Tue, 30 Nov 2021 03:11:30 -0800 (PST) Received: from ?IPV6:2001:b07:6468:f312:c8dd:75d4:99ab:290a? ([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.googlemail.com with ESMTPSA id mp9sm9205581ejc.106.2021.11.30.03.11.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Nov 2021 03:11:30 -0800 (PST) Sender: Paolo Bonzini Message-ID: <041803a2-e7cc-4c0a-c04a-af30d6502b45@redhat.com> Date: Tue, 30 Nov 2021 12:11:29 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Subject: Re: Potential bug in TDP MMU Content-Language: en-US To: Ignat Korchagin , kvm@vger.kernel.org Cc: stevensd@chromium.org, kernel-team References: From: Paolo Bonzini In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 11/30/21 11:58, Ignat Korchagin wrote: > I have managed to reliably reproduce the issue on a QEMU VM (on a host > with nested virtualisation enabled). Here are the steps: > > 1. Install gvisor as per > https://gvisor.dev/docs/user_guide/install/#install-latest > 2. Run > $ for i in $(seq 1 100); do sudo runsc --platform=kvm --network=none > do echo ok; done > > I've tried to recompile the kernel with the above patch, but > unfortunately it does fix the issue. I'm happy to try other > patches/fixes queued for 5.16-rc4 You can find them already in the "for-linus" tag of kvm.git as well as in the master branch, but there isn't much else. Paolo