From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5BA6526C39E for ; Tue, 21 Apr 2026 16:36:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776789398; cv=none; b=EmVBSqIDVMhtynEUHkA3o1NNdog/KpRX2uOdjXVJK+gd1M3fI/4JRLCvYIlYLLSZuymHW8tTekLGPRZyoGuqRZBC8f9G8u0XIlXwBN3Dq5Fq4sGUGPn3hGhB04Vd+1PyWCLK/1tLLqERkmKh7A7Mf/7Yw2yV2n8HsrSuwTJArS0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776789398; c=relaxed/simple; bh=znWo9nsColSxcabZyAKOOm4iIhGimwX6ddJbvAW2zTI=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=QAYT5oLdoGdzynse42JebEOYnwBlLqSI9Hs3r/qyW070ZqtQmE8YAFWnfj+19l1CjfU9QbTdz+1YXA9LDNFMR5Rim2h7afzduBCdgqg88OnpHjHlk7h+d7OlI7sIIMQIvOByKKji/znZccpFO0MIjRpw5N6zsa1w+GZuyn6J9UE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tm2nqHt9; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="tm2nqHt9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 439A7C2BCB0; Tue, 21 Apr 2026 16:36:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776789398; bh=znWo9nsColSxcabZyAKOOm4iIhGimwX6ddJbvAW2zTI=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=tm2nqHt9SvUeo7TNqoykbBMbd2UdDGnAKsfnskNATB+xrDgJ6KZbMg8wIyQYMqBsy yg4B9FnTi4PBHBH41yNb2Hd7Q7G4MtCPyvFKJOqVkdJRt4Gg57xA8qykjvRmteN5sh d12Tg/398p5AouG5YrwJYVJ+y0rLP/oqu1x8vTa+wbC6KGFaZbNXOjeVq8k/zgQEhO PD1BBfx7NyOHpH5gd8Eg1L9kt2fYQ9XfgMB84sg1JGJHQiC/T7op0b54MZt390ddFY cZJ0y3Dt7X9BlaOwQjTZYCsqdo5YhaX4VLN1ifkfoSg7UgWgt41jSJKHbYLN2WwdnU R+3R+cRcdF/CQ== From: Thomas Gleixner To: Peter Zijlstra Cc: Binbin Wu , "Verma, Vishal L" , "kvm@vger.kernel.org" , "Edgecombe, Rick P" , "Wu, Binbin" , "x86@kernel.org" Subject: Re: CPU Lockups in KVM with deferred hrtimer rearming In-Reply-To: <20260421132913.GB1064669@noisy.programming.kicks-ass.net> References: <70cd3e97fbb796e2eb2ff8cd4b7614ada05a5f24.camel@intel.com> <87mryxekxy.ffs@tglx> <770ae152-c3fd-4068-8462-23064de02238@linux.intel.com> <87eck8daot.ffs@tglx> <20260421111858.GH3126523@noisy.programming.kicks-ass.net> <20260421113212.GI3126523@noisy.programming.kicks-ass.net> <20260421113407.GE3102924@noisy.programming.kicks-ass.net> <20260421114940.GJ3126523@noisy.programming.kicks-ass.net> <20260421120531.GF3102924@noisy.programming.kicks-ass.net> <20260421131953.GA1064669@noisy.programming.kicks-ass.net> <20260421132913.GB1064669@noisy.programming.kicks-ass.net> Date: Tue, 21 Apr 2026 18:36:32 +0200 Message-ID: <87h5p4b78v.ffs@tglx> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Tue, Apr 21 2026 at 15:29, Peter Zijlstra wrote: > On Tue, Apr 21, 2026 at 03:19:53PM +0200, Peter Zijlstra wrote: >> > Moo, you can't do that either, because it will ERETS/IRET and fuck up >> > the state :/ >> >> How insane is something like this? Pretty insane :)