From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BC1ED4683 for ; Wed, 17 Jan 2024 01:05:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705453518; cv=none; b=OJcREofB9o7/YRca1PnJltR4q/sqiWIFEVQtJ4tDraSluPiamMZKB/ZSBIlOSTEitB6jZbo6+0aaFblNhzZpxcEoEipMtOOSKK3uNC5Z2HFXayPicmLCeN2tF9qAtN4VExEJJYUJ20a0/EkXC+3XVaCLgx5JJaoJ79ZER44WztE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705453518; c=relaxed/simple; bh=ivMZlPL10wMiuh5RI8lMpyWcINCSV4uJPhcMAtLj8Zw=; h=Received:DKIM-Signature:X-Google-DKIM-Signature: X-Gm-Message-State:X-Google-Smtp-Source:X-Received:Date: In-Reply-To:Mime-Version:References:Message-ID:Subject:From:To:Cc: Content-Type; b=H/yunnIad2L6mK/4c6mBGSFhXwTeCC+xIFkAHxNag+AQx/2wvrUeGUHzyAD0XYkIw8/MwgjGb3V1u/l0bwrPKJ+NcicRfV0X2sotD6656F8rcZ0Jq8LAeXFbN80nxmmedVBukqAQ9d00BK+iww0Bc8t6K3eI/OSl6mDlsMwmE3k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=sHwMgMgi; arc=none smtp.client-ip=209.85.210.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="sHwMgMgi" Received: by mail-pf1-f202.google.com with SMTP id d2e1a72fcca58-6d9c7de0620so8954109b3a.1 for ; Tue, 16 Jan 2024 17:05:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1705453516; x=1706058316; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=IKB8mSNKRsRlec2vx6K4+40UUB3h48mLOZFSolotTL0=; b=sHwMgMgiQ6ubuSV2pZE2qnFWzjAqY9ONUAFytbjm0J4ofFkzNfkmdd2PseZN7aHPql o6z0guX98Rc4gUFp+j1LLka7CzHupqMacCBIxsH/ctn3i54fGdw84ZO72Ee0cxiS7OnX 6ugKrUz/wnFz27vNht5N3xtMkwlQo6LHs8uN8jj32HZNkg67Uv7qXgJZZdhYqsAYooKF 6xYVaL1kw7Y3SMyn1R0bT1VSnLG2duBVO+tWNbWwP8pquchu3ny4bfhvrvhmwJb2HZ3E GvChz8EM1h6eiaS83jZz818PO5bJF3vL0VdgLWKG7m5BCTQv6TMsaKJ7WR9JSqg/gahF jBCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1705453516; x=1706058316; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=IKB8mSNKRsRlec2vx6K4+40UUB3h48mLOZFSolotTL0=; b=UgA0iuKD9iSB5lcWI2R+TiabjXw4QwAniGdJIySgz2XnwAKuRqcHrF69Ha85UkfNCe hWvcL5x/6s3BY3au2rV5JQs+z1fcUDlXqgr8aMHtA0fy4e9JMa/0HJCdtAh2omh+eihC QkuNqynZ+6gb++srW9rQWvKW+r+Q0jrvPIjiIF50cmofju4Sd0UqeUEb042ZvTNtr7HT NAc54Y7qqeAhkrEnrRfoHIw0UBuPavOTDwxVPIeObZ9ami/+rzlEQAaXDcLGdXZeT6yI daHIBxWnWznjpOEAgfJeFPFmINyqg1HEQzocbky/TeFLh/YuFPwRGUxxmx+FJlE5EX7/ E5Tw== X-Gm-Message-State: AOJu0YyCd/iDV/uaIH0prf8UWCzJQK/2azltJjTwL7FMFX+lp9fKNvvE 7Nq0VLjqcDDHuN7zXnZcs0ABylb8C3kvB9QUXEJZpJZ0IohYcNpReErr9rBO4NLxwaIuWGK1/HO ihQ== X-Google-Smtp-Source: AGHT+IFoCXDD5PFg72UkfAOt6YI4Gjj6J6lS+S11t9VLKUwIvungIJioTt+tHYbdfewkkVWlaUPbt8PtnwY= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6a00:8916:b0:6da:3fa7:d79c with SMTP id hw22-20020a056a00891600b006da3fa7d79cmr204pfb.1.1705453515949; Tue, 16 Jan 2024 17:05:15 -0800 (PST) Date: Tue, 16 Jan 2024 17:05:14 -0800 In-Reply-To: Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: Message-ID: Subject: Re: [Bug 218259] High latency in KVM guests From: Sean Christopherson To: bugzilla-daemon@kernel.org Cc: kvm@vger.kernel.org Content-Type: text/plain; charset="us-ascii" On Tue, Jan 16, 2024, bugzilla-daemon@kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=218259 > > --- Comment #9 from Joern Heissler (kernelbugs2012@joern-heissler.de) --- > (In reply to Sean Christopherson from comment #5) > > On Thu, Dec 14, 2023, bugzilla-daemon@kernel.org wrote: > > > While the [tdp_mmu] module param is writable, it's effectively snapshotted by > > each VM during creation, i.e. toggling it won't affect running VMs. > > How can I see which MMU a running VM is using? You can't, which in hindsight was a rather stupid thing for us to not make visible somewhere. As of v6.3, the module param is read-only, i.e. it's either enable or disabled for all VMs, so sadly it's unlikely that older kernels will see any kind of "fix".