From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qv1-f53.google.com (mail-qv1-f53.google.com [209.85.219.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D4CDD284B2F for ; Wed, 4 Feb 2026 12:47:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.53 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770209238; cv=none; b=pTE7QiabPTlE8IpDn9KxeWb6nUwasGUNShTODAs9/Sh3CunBnwihMVRyFblsnnxkdQCyZcxfOFGHZcvO/u8DLZcE8QFVTcXctdzWwXBa6tWPc+r2562NsN/BoUs8L79OL9uaGbjqh/n2fm/fpZI7bh49drnXjTc80HLEP4a2Mlk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770209238; c=relaxed/simple; bh=sIl8zPvTMavW7op27NWntwAoYxbkYCvD1OGJGO1W/G4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=CbPXcnjC4mpGnCKawrTA43gl2his5GWbscKvWap2zNYqSLRX65Vn/dkA5HtPY6kT9EhqkrH3hCAR67qs743CWa9lJn13k4zmxNuGmIPF61n29X2aZieSXHtWAq1wb8UGOSiApXUmghNCWoZTtVrLwjfzZGUMcwtufi4MH4thhvQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca; spf=pass smtp.mailfrom=ziepe.ca; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b=GW4VHNlj; arc=none smtp.client-ip=209.85.219.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="GW4VHNlj" Received: by mail-qv1-f53.google.com with SMTP id 6a1803df08f44-89476eaaf16so67778466d6.1 for ; Wed, 04 Feb 2026 04:47:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; t=1770209237; x=1770814037; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=+U8LpVemtW+m+yu1KTxoehmwVgUgV8X5ud3ORfVCCrA=; b=GW4VHNljJYFgI4mruLbg7vYCpHKew/dRjvlqzTeNn86+wrDMfx4zpIj/dioyccLJXP XACl0ggJFwCgkw29MoP/25q6//IrEkYd5b1PaWKqIt2jogVrM5cjO4x8m4SXMm5gCTeq 7+sRa7wqOIMHi2uMMWQ4hgsHW3KpXETuwQdLYmSxbznzYiFF/OpfJ5wYd2+ZEE/Uq1FI Y4nSEVvDEDY7SKTbbuouPMPgd9Kb81K7EZt/IwblUTd+zVebhGIivCskRSb47BFJPge9 pAIPD6qNA+nYIkrf2Ayi8x0N4WX83p8Cy9t0L1BJVFY9mZOU1Aekk1WQ1812YLGIQSQW a64g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770209237; x=1770814037; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=+U8LpVemtW+m+yu1KTxoehmwVgUgV8X5ud3ORfVCCrA=; b=ux0UT1/w0ncVOx1pzEEWy5fgnqTx7YUSlV1NEJS3rPSmeZirENenO51djfgc7UGHn/ xjIvDahaok2/pF8aPu6IoKupwA5/ppXhauljrniuuAUV3vB8G/1wwAjDFi0448jbUnb7 KqKXCQhOMhwuPQIcfXRoLmBvCFMBvRabmei9deZv/BCPjOQ5r93htrn9DWXRrqhyQDdr u37uXW2AhjzTgwXEg+Rx9HT9+IKK6eBzHWAMgoQHeQ5uXVYT92IDzt8M00qF2h5UOemp Xhf6+i7LsI6xEPVo5I3hRfZP0XHYo9XeWTbIQsK5Sh8Zx0GXim4A2kv2bCFP8huwwfx+ auGg== X-Forwarded-Encrypted: i=1; AJvYcCViT/1ofESWr+/c0YDt+qWnWmASbF48V6kqIRGY86+UI+DZcbUhQUinlBUOd8OPsKM1hIwj4aRhuOQ1yRad@vger.kernel.org X-Gm-Message-State: AOJu0YzRtf46m+tHR650SDqFvJJGJr3wToQOr0hiZMXGlrEynsGpWUFd XC8qQCuZvRlNbU6bNSYCu3pluJQ2guMF6HjYmRcXDOOVGQzBhVa4VEkxuRCkxwRmVrI= X-Gm-Gg: AZuq6aIViSP2ZnLkFUCY3eb0O+wDqLbUJhrEp6rq+o6UlUYRh6a0I2FAsIcEAHj/R70 M8YjgSKvm2qNlezXEqcuMr7UFnY0zbCCg7yzV6tak7kfcyte17LGXzONBf5U+nPtxBKx5lcaKkA i8TVgk8B9MdxHnK+/az3gqyAFmM7rpSfSg2Ti53TyR9NhkzRpfn6rV2QvOFFYwTNljDsAKmDkGA bXB30DXpdz7W396RtUzlZBygzz3zaxlliN7LoBJKJnbWi494ONa+ZnXqryzEGKGzH2TZja9SxfG ZXosbAKNzDCAF+7juZPA2RsRdXznRxxtZEkYl66QLYXnc/duS1W+GJ8i5/1ppM5iqo5GlcUpGFz QcQ+z2SSQz9jLVRiENZcV2HcZWW54jGndhVq6+Xkh1mZ6Q4sAcFAI7cHe/e4jQi0IjLk9Uu1q9X TfuJf1qDyMB5hfX0nj8MBj1yx8Q2k9gR7CDBH/rFbUBmrvq2Zck9t69WIxM6u92CCtKfA= X-Received: by 2002:ac8:7f4d:0:b0:4ee:5fc:43d9 with SMTP id d75a77b69052e-5061c0d57d6mr32950401cf.16.1770209236488; Wed, 04 Feb 2026 04:47:16 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-112-119.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.112.119]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-5061c14815asm18573661cf.6.2026.02.04.04.47.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Feb 2026 04:47:15 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1vncHr-0000000Gzio-1QmV; Wed, 04 Feb 2026 08:47:15 -0400 Date: Wed, 4 Feb 2026 08:47:15 -0400 From: Jason Gunthorpe To: Xu Yilun Cc: Sean Christopherson , Ackerley Tng , Alexey Kardashevskiy , cgroups@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, akpm@linux-foundation.org, binbin.wu@linux.intel.com, bp@alien8.de, brauner@kernel.org, chao.p.peng@intel.com, chenhuacai@kernel.org, corbet@lwn.net, dave.hansen@intel.com, dave.hansen@linux.intel.com, david@redhat.com, dmatlack@google.com, erdemaktas@google.com, fan.du@intel.com, fvdl@google.com, haibo1.xu@intel.com, hannes@cmpxchg.org, hch@infradead.org, hpa@zytor.com, hughd@google.com, ira.weiny@intel.com, isaku.yamahata@intel.com, jack@suse.cz, james.morse@arm.com, jarkko@kernel.org, jgowans@amazon.com, jhubbard@nvidia.com, jroedel@suse.de, jthoughton@google.com, jun.miao@intel.com, kai.huang@intel.com, keirf@google.com, kent.overstreet@linux.dev, liam.merwick@oracle.com, maciej.wieczor-retman@intel.com, mail@maciej.szmigiero.name, maobibo@loongson.cn, mathieu.desnoyers@efficios.com, maz@kernel.org, mhiramat@kernel.org, mhocko@kernel.org, mic@digikod.net, michael.roth@amd.com, mingo@redhat.com, mlevitsk@redhat.com, mpe@ellerman.id.au, muchun.song@linux.dev, nikunj@amd.com, nsaenz@amazon.es, oliver.upton@linux.dev, palmer@dabbelt.com, pankaj.gupta@amd.com, paul.walmsley@sifive.com, pbonzini@redhat.com, peterx@redhat.com, pgonda@google.com, prsampat@amd.com, pvorel@suse.cz, qperret@google.com, richard.weiyang@gmail.com, rick.p.edgecombe@intel.com, rientjes@google.com, rostedt@goodmis.org, roypat@amazon.co.uk, rppt@kernel.org, shakeel.butt@linux.dev, shuah@kernel.org, steven.price@arm.com, steven.sistare@oracle.com, suzuki.poulose@arm.com, tabba@google.com, tglx@linutronix.de, thomas.lendacky@amd.com, vannapurve@google.com, vbabka@suse.cz, viro@zeniv.linux.org.uk, vkuznets@redhat.com, wei.w.wang@intel.com, will@kernel.org, willy@infradead.org, wyihan@google.com, xiaoyao.li@intel.com, yan.y.zhao@intel.com, yilun.xu@intel.com, yuzenghui@huawei.com, zhiquan1.li@intel.com Subject: Re: [RFC PATCH v1 05/37] KVM: guest_memfd: Wire up kvm_get_memory_attributes() to per-gmem attributes Message-ID: <20260204124715.GA2328995@ziepe.ca> References: <071a3c6603809186e914fe5fed939edee4e11988.1760731772.git.ackerleytng@google.com> <07836b1d-d0d8-40f2-8f7b-7805beca31d0@amd.com> <20260129003753.GZ1641016@ziepe.ca> <20260203181618.GY2328995@ziepe.ca> Precedence: bulk X-Mailing-List: linux-fsdevel@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 Wed, Feb 04, 2026 at 12:43:16PM +0800, Xu Yilun wrote: > > Which means we need VFIO to know what they are, and hopefully it is > > just static based on the TDISP reports.. > > I don't think VMM need to check TDISP report. The only special thing is > the MSI-X mixed pages which can be figured out by standard PCI > discovery. Either that or follow along with the guests's choices on shared/private. We can't let VFIO mmap a private MMIO page, so it has to know which pages are private at any moment, and it can't guess. Jason