From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 329531DE4C6 for ; Wed, 19 Feb 2025 16:49:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739983763; cv=none; b=HMUoDR5gRaYEKmB/d2HgjpVvpGMJAvTLLeJlWpsQ6ldWwpecUtlV+L6U2+fCX4jNDpjyY98pH5j7WtYe7H7EIEHPZt13sdjPNXUw1hgKaI6oIFTZGDAZWJ2WSondVbDPv5Wiwr5rtiwQ62XflGyjgHK4aJIcggMBrANO3X640mg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739983763; c=relaxed/simple; bh=7rc1d/SjX6ZUEsz5GUvOB9z1e+pX4PsmcEMEOYv2A0A=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=bwviAByzjcfJocWL2wT8I4Ye4yBoecM72v7uuCswewKgEmSstxVLmXsEEZujuSKnLEuW3tMzQkdFAx/1FNOoVJvquqFwHCNiJmsptaaPH3uFUzVMyqKyF5hIadw4EPm3Qx4JQLt/NrUR5APuktDH/+TagAfMkUTCmda8sjwXtkc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=L2LPc7GF; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="L2LPc7GF" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=zhIvxo9ed3SAUc9WUeA/MwYtzmAfVb1ZUH/2B34fAcM=; b=L2LPc7GFXLnXI83aLkusVmg3ns TWoiCoKihDLl3UIoJWoEmdkdmI0XlDRDun1IlDPUcLcTK3SzTou7XJ53fhN3eSNmeZkxEU5GTAC/B Ju6n7cE1nIG1bXyB9pSRULzSYA5xZh5orY01ql7NWjCVAbpdDoEdsgzjV25fuh/52ektkvIoYWs20 T8+uBIbTAz1crSdqDSu2D2MvpocrRGg7234jqMZv6DTNfIUACmMs/0wmLb6Mn1Xi0Iyu2tZSVgBtl jeNMn+OHAk3VQVbvijc7ZZDD9fM1lXyDQxEUNwKmxvpYw0m/att1ZP+aSYVObM5oAz9mOs3dv199W HGDAIEkA==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tknG8-00000002HOS-1UJQ; Wed, 19 Feb 2025 16:49:16 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id E95ED300783; Wed, 19 Feb 2025 17:49:15 +0100 (CET) Date: Wed, 19 Feb 2025 17:49:15 +0100 From: Peter Zijlstra To: Andrew Cooper Cc: x86@kernel.org, linux-kernel@vger.kernel.org, alyssa.milburn@intel.com, scott.d.constable@intel.com, joao@overdrivepizza.com, jpoimboe@kernel.org, jose.marchesi@oracle.com, hjl.tools@gmail.com, ndesaulniers@google.com, samitolvanen@google.com, nathan@kernel.org, ojeda@kernel.org, kees@kernel.org, alexei.starovoitov@gmail.com, mhiramat@kernel.org, jmill@asu.edu Subject: Re: [PATCH v3 03/10] x86/traps: Decode 0xEA #UD Message-ID: <20250219164915.GH34567@noisy.programming.kicks-ass.net> References: <20250219162107.880673196@infradead.org> <20250219163514.581527735@infradead.org> <101d4be1-9090-4d3f-8f21-d1ab6ecb79cd@citrix.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <101d4be1-9090-4d3f-8f21-d1ab6ecb79cd@citrix.com> On Wed, Feb 19, 2025 at 04:47:10PM +0000, Andrew Cooper wrote: > On 19/02/2025 4:21 pm, Peter Zijlstra wrote: > > FineIBT will start using 0xEA as #UD > > > > Signed-off-by: Peter Zijlstra (Intel) > > FINEIBT probably ought to gain a "depends on X86_64" too, or this is > going to go wrong in a very fun way. It already is: config X86_KERNEL_IBT depends on X86_64 && CC_HAS_IBT && HAVE_OBJTOOL Nobody wants to touch i386 if they don't have to :-)