From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 B99B323EA84; Wed, 12 Aug 2026 14:38:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786545517; cv=none; b=nCgoS5DGziu8Gu6R7qaJbb2bj7oyjGSZF79srp3xEEp1dJhn1O+44gtSIDgKxIc8H2fxE3pyyY+uiIV4NGsWiYyh3hwp0AjmgSpXvQ3pFVE5mleKcPMrrHMkJOI3btwM1fIpGp7ObrUQjURqup0GLH/d7ffDa7gxHapCpVCO9MA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786545517; c=relaxed/simple; bh=93QnXaMOBw9iqWgnQ+zhbLuL6rbaVZDDgr9kabywcF4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Cu/zFON/iMp/9ayR9/l+WsJ4ynnr6VD5G5apJtbP7hokc/BF8YUAwl/9O34mXEUoePkGbaV0ahtbTEohfQGciYadAdXFhq6WodYUwGGu5S1C4oFrGGNIa6dMUrrqcAow+d0OFN8FgU9FwH9ALj7ekZolo0zHR6Vluf+lc14OUQk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=DgBoIh+z; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="DgBoIh+z" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=93QnXaMOBw9iqWgnQ+zhbLuL6rbaVZDDgr9kabywcF4=; b=DgBoIh+zjlatPFlBzBv8K2LrO+ MLnj89HLTZL6996fUD41CiRrS5W79jb29v8y4LY6k4e0AFcPTJ/nI5c1vCUL1NeZ6pCma05tBkhdv P4Ltm0SInGTNqg0H7O4RxCkq7PygiiROdt3QTgicGXMr5bRkJvQsQKjZoq5qKFMJNFZacurDhGgFB 6mCClxw6fYVOzVPE6kUyXDsHL3mBI9oQL78jeAUx8yVRTwvMyTnt94h03ogWfAeMXWdpKQ6VyXDyb 0HsutOpIOgBEFpHcigeUiPGnPzSG30lBAyrj3qhtJiEktsNpYActucIBTsbYS5hK2nbkFKpZpjwS1 rk8jiGiA==; Received: from [2001:8b0:10b:5:a3a3:d97e:a004:df29] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wuA68-000000027Uc-1I9r; Wed, 12 Aug 2026 14:38:28 +0000 Message-ID: <9e65be44430e7d013fedf9a1626caba020ad6d94.camel@infradead.org> Subject: Re: [PATCH] mm/mmu_notifier: Remove non_block_start/end() from notifier invocation From: David Woodhouse To: Jason Gunthorpe Cc: Michal Hocko , Steven Rostedt , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Sebastian Andrzej Siewior , Clark Williams , Simona Vetter , =?ISO-8859-1?Q?J=E9r=F4me?= Glisse , Christian =?ISO-8859-1?Q?K=F6nig?= , "Paul E. McKenney" , Sean Christopherson , Paolo Bonzini , linux-mm@kvack.org, kvm@vger.kernel.org, linux-rt-devel@lists.linux.dev, linux-kernel@vger.kernel.org Date: Wed, 12 Aug 2026 15:38:21 +0100 In-Reply-To: <20260812142659.GD662699@ziepe.ca> References: <20260811142730.GG544626@ziepe.ca> <20260811104229.72fdd928@gandalf.local.home> <37b83b429b9f14ea6ad4ca1c13cc8e565ec09033.camel@infradead.org> <44c51ace9b0dc44b795f6f48c91cda440eed910b.camel@infradead.org> <20260812122759.GA662699@ziepe.ca> <20260812134934.GC662699@ziepe.ca> <20260812142659.GD662699@ziepe.ca> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-vF1ORSio6Vq2xkEwJ8nS" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-vF1ORSio6Vq2xkEwJ8nS Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2026-08-12 at 11:26 -0300, Jason Gunthorpe wrote: > On Wed, Aug 12, 2026 at 03:05:43PM +0100, David Woodhouse wrote: > > the non_block_{start,end} guards around the MMU notifiers, which are > > basically never being called anyway and don't actually seem to protect > > against any real bugs. >=20 > If you think this blocked stuff is dead code then lets remove it, but > I'm pretty sure it is called and I remember seeing bug reports about > it being triggered in the wild. Vetter certainly added it because > their tests were actually triggering and they had bugs in their DRM > stack directly connected to this. >=20 > It might not trigger for your hypervisor case but we aren't here just > to make only kvm work now are we? I'm sure there can be real-world use cases where it can trigger, but when I was *trying* to exercise the code path, to validate my belief (from source inspection) that even the plain spinlock would trigger the splat, I ended up having to hack the kernel to do so: https://lore.kernel.org/all/787aa26cf62dfd361eea8ed19f384fc517892501.camel@= infradead.org/ Perhaps in the past it was easier to trigger 'naturally'? --=-vF1ORSio6Vq2xkEwJ8nS Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE 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