From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 B8FD857C9F for ; Thu, 6 Feb 2025 14:30:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738852249; cv=none; b=MLXDn8Ivk5IQUuk0UvPkxGJI3QIgsUtRTNf6tEAt+Bzglhxr5xTsjORta07l695zVFbaGnvuOpRSZ24vT72eLo4fN3oCUc3hTci2f5fj/y5DIYkhsquEI2bYDMtZ8Yze0RzCPt4LP42XXw14lY0e8Owb8tfJ9/8QQAucSW6Rff8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738852249; c=relaxed/simple; bh=WdipNZI3y5wwEW1WPJkKmfPilkJ7iVaBxEPNzdzmX4E=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=AB5r6Tkk7GkrOWq045F3wEcASVXDvsqnVz+uKjGcv2s2OoO80T20Cfh49FTBSC2uJVRLuZ123qmSqBdfmyC2M8axGTj96eUE6boX00I07s4F0GAdFrKWpdC4sQAvHTwqYtlSGrG4KZQ1qcBcDXUtlCslG49OLgE2iXhRkeFkFVg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=CDkjfouy; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="CDkjfouy" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1738852246; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=WdipNZI3y5wwEW1WPJkKmfPilkJ7iVaBxEPNzdzmX4E=; b=CDkjfouyt5dauUvfIC7ViNGjW3fTIMDVyTCX3dsHs8Z5w4RfUfCxD+D5wQsK8l1cmH2SXN 0PHJPqTyne8Bmrr7LAmkIQccLhQ6aZwBgP3jzT8lmE3eTqGUXUJSD7kSh575dlDvoxt275 Bt6yi//cS5ogLeqN+q+v78ujJUn5+so= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-669-jpp1Wx5AN3GqEECzTVdKQg-1; Thu, 06 Feb 2025 09:30:43 -0500 X-MC-Unique: jpp1Wx5AN3GqEECzTVdKQg-1 X-Mimecast-MFC-AGG-ID: jpp1Wx5AN3GqEECzTVdKQg Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id AAACC1956086; Thu, 6 Feb 2025 14:30:36 +0000 (UTC) Received: from localhost (unknown [10.2.16.145]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 6D97B1800878; Thu, 6 Feb 2025 14:30:33 +0000 (UTC) Date: Thu, 6 Feb 2025 09:30:32 -0500 From: Stefan Hajnoczi To: Vivek Goyal Cc: Dan Williams , Alistair Popple , akpm@linux-foundation.org, linux-mm@kvack.org, alison.schofield@intel.com, lina@asahilina.net, zhang.lyra@gmail.com, gerald.schaefer@linux.ibm.com, vishal.l.verma@intel.com, dave.jiang@intel.com, logang@deltatee.com, bhelgaas@google.com, jack@suse.cz, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, mpe@ellerman.id.au, npiggin@gmail.com, dave.hansen@linux.intel.com, ira.weiny@intel.com, willy@infradead.org, djwong@kernel.org, tytso@mit.edu, linmiaohe@huawei.com, david@redhat.com, peterx@redhat.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, david@fromorbit.com, chenhuacai@kernel.org, kernel@xen0n.name, loongarch@lists.linux.dev, Hanna Czenczek , German Maglione , Albert Esteve Subject: Re: [PATCH v6 01/26] fuse: Fix dax truncate/punch_hole fault path Message-ID: <20250206143032.GA400591@fedora> References: <67a3fde7da328_2d2c2942b@dwillia2-xfh.jf.intel.com.notmuch> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="dVdFjdbROmPA0Gp+" Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 --dVdFjdbROmPA0Gp+ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Feb 06, 2025 at 08:37:07AM -0500, Vivek Goyal wrote: > And then there are challenges at QEMU level. virtiofsd needs additional > vhost-user commands to implement DAX and these never went upstream in > QEMU. I hope these challenges are sorted at some point of time. Albert Esteve has been working on QEMU support: https://lore.kernel.org/qemu-devel/20240912145335.129447-1-aesteve@redhat.com/ He has a viable solution. I think the remaining issue is how to best structure the memory regions. The reason for slow progress is not because it can't be done, it's probably just because this is a background task. Please discuss with Albert if QEMU support is urgent. Stefan --dVdFjdbROmPA0Gp+ Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAmekx4gACgkQnKSrs4Gr c8jOKwf/ZukZTp1v1Bj1iqbpAm6HBWN90Y4JWmyzZGuKRqLAwN8AyiIJ6Ms1fx+v WJLR47NztCQ3sDtsTQT1814wwXSpJlPguLu6isoWbCGpUwAZZk3JTpHNBofs7IKj 04NWFZ9B2tOVgirm8OMtsVVJwzQhvQc7YtMhdB9naCzqcdC7ynKp6mLH9bd7Q+Ze K9CwEFtKcTm9Ge+t3U0E3Q7MI2D55far3KPi84MpfI9oEu6l0MOzzmKjaOBq9+wy XXZCisxWbGLZtfbY2BAQxTUhKq9TTXgeQm/Ti/SzsVLf/Qd7nrEkG1v51xs5HCnR FMQhDw7oBmFsGs5S/Qywvta1pcaYwg== =JZcT -----END PGP SIGNATURE----- --dVdFjdbROmPA0Gp+--