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 E27C137DE9F; Mon, 8 Jun 2026 14:21:38 +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=1780928500; cv=none; b=MY6ii+9RaPLSNygZEL1ObEyd0QkcLeGDU2lyGcwMcfh3o5+qk6+8B6kJ2B+HkHHL3/pNVgXTv2LSrZ3hAQWioLYEM+d5Ds558hapJMVf9WQb6CLdCea+uST+iiRkJ8zCevo0m3b0djAUh4XCXdI8qSxeKRxJBmDoUhiwW4Rw3Yo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780928500; c=relaxed/simple; bh=dIp8OncR/N6+Msx6ebEIl2OPdEwxVMr5YeI9woh/zqk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=eZ7WLEy7hHvX7573Sze7V9ByTw2NpCVhUBXUSYHUHo4qgP11lNOzBuf/v0ElSc60VPZBQR4rytqsVS5qo+n9B8Bm3/zSZj/hZ/gmGqUb0os35waOBJRnixhFDED4pncGzNyJgxoEyqNTdKowQ1blmj7mkXdjwbp4VRdX1AZK/m0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=pass smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=Zi/4pEzk; 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=pass 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="Zi/4pEzk" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=h/FvwH7hiTUiSgXuBMQJZGeWVoT1jQU76udfTFE9sNg=; b=Zi/4pEzkbmp3eNe66ZAaDUYa1O fOc32vjLemygMfE9A3RkrAkbdgVmPv/sqfT6ysqFHPFFrBfvD55DXejRYaI6bCgYNF53/hH8jGHky zu2L5HVQnDcF4il0hThRMP3dfpVqmxdx9TRI2bb5Noz1rvTR4R4oY0DzWWRkWvgbefONG6Wum3uXx ESRmzCTd/xhw0qjCIGcHESk4G6UK3OP0GHqjxvOzNqPWEBaFFVOKjXCAQTlEY8XE7253MSrvrWYdh 0isoec0vPjBh+/2uObNe0TStQX2gRd9NiZgD76bHAaeXhFt6O9yU/He8xxcMDaqHrYmp14YU0336T 4kFGef8A==; Received: from willy by casper.infradead.org with local (Exim 4.99.1 #2 (Red Hat Linux)) id 1wWaqz-0000000DqUd-1gvI; Mon, 08 Jun 2026 14:21:25 +0000 Date: Mon, 8 Jun 2026 15:21:25 +0100 From: Matthew Wilcox To: "Michael S. Tsirkin" Cc: linux-kernel@vger.kernel.org, "David Hildenbrand (Arm)" , Jason Wang , Xuan Zhuo , Eugenio =?iso-8859-1?Q?P=E9rez?= , Muchun Song , Oscar Salvador , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Hugh Dickins , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Christoph Lameter , David Rientjes , Roman Gushchin , Harry Yoo , Axel Rasmussen , Yuanchu Xie , Wei Xu , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , virtualization@lists.linux.dev, linux-mm@kvack.org, Andrea Arcangeli Subject: Re: [PATCH v10 00/37] mm/virtio: skip redundant zeroing of host-zeroed pages Message-ID: References: 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: On Mon, Jun 08, 2026 at 04:33:46AM -0400, Michael S. Tsirkin wrote: > Further, on architectures with aliasing caches, upstream with init_on_alloc Further to what? Did you leave out some paragraphs here? As far as I can tell, this patch series decides to trust that the hypervisor has zeroed pages that it allocates to the guest. But as far as I can tell, the trend is towards less trust in the hypervisor from the guest, not more.