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 81D6F44C89; Fri, 22 Mar 2024 14:27:33 +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=1711117655; cv=none; b=Gm2hIqkRLJpm+qHVfI6pXWmBOueU/rDWPY3jDgaB2p4jL3gv9r9lwpswRKgxWL8uiPEHvLdtAWW2uad41HN5i9YmPRBkkOTevOrW0AzZah9v2pC20Udl/XA7PXUcPoMf0inAlE3CNR8VO1mmi1KYfW9DnYXQx//ynEyrqyGgZPw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711117655; c=relaxed/simple; bh=bw4vhtLjqJpYwYIS8AXmj7MejXi/EOT8hO1g7e2RFqQ=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=uDNflKA8KHOO6AI4sdPpNvp/IPS+8RWiA/94ccTtTupV5mBdVg6exzFivDu+HRVyPE5bnOw3BJgg9f1z1WH1CK03grxEYRdXR3e5GzsP/VIGvC5x6IVy17Eys3MrXZbKGaY56y5JuA4B36wN2RZJSnQm0EqRoEiqTqrD3Okttko= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (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=Dwo8MzsG; arc=none smtp.client-ip=90.155.50.34 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=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="Dwo8MzsG" 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=bw4vhtLjqJpYwYIS8AXmj7MejXi/EOT8hO1g7e2RFqQ=; b=Dwo8MzsGf5mwG11t9wkNFBKuuv VO9pmMb2xGCeMRKHfaQWX6vozNKPf1rENfBw8eU60rqQT09J6aOmAoXz9HH/ZmJpnz9aE7CSNEu71 PTNDo8LI3JhD/eCa+LzfItgVzA4q4QG9n9u0D27Ldo4bpthGMECulFzqQQn6L+ZRSHEweB4UeY3rr ngjyAT784booYg3I3Q1xriYXg7oPp8e/SuZuS8215cFdNEqWTnOjJcqhEt/XQsMb6wUObf5dErBgO bPUBHyzgzDrU2K5QDCW74egoyHo9uGsehkh8FOdrvnxjqGjY8nLkwKAjNV/S/n9Tmu//JP6xOcch0 RPg+f3Ow==; Received: from [2001:8b0:10b:5:244c:6ee0:3d43:8a85] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1rnfrf-00000009W4L-0FTH; Fri, 22 Mar 2024 14:27:23 +0000 Message-ID: <0a83e174db16e15cb0f0d3ac37d6717c918ee78d.camel@infradead.org> Subject: Re: [PATCH v1 0/4] virt: vmgenid: Add devicetree bindings support From: David Woodhouse To: Rob Herring Cc: Krzysztof Kozlowski , "Landge, Sudan" , Sudan Landge , tytso@mit.edu, Jason@zx2c4.com, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, sathyanarayanan.kuppuswamy@linux.intel.com, thomas.lendacky@amd.com, dan.j.williams@intel.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, graf@amazon.de, bchalios@amazon.es, xmarcalx@amazon.co.uk, ardb@kernel.org, benh Date: Fri, 22 Mar 2024 14:27:22 +0000 In-Reply-To: References: <20240319143253.22317-1-sudanl@amazon.com> <23692c07-98bd-477d-b244-bba14c50352c@linaro.org> <38aad6c0e698c8e804694276d1762d61f2068ce8.camel@infradead.org> <20240320161531.GA1810860-robh@kernel.org> <60404403932a984d1f75d111ff53b9053af03579.camel@infradead.org> <20240321133250.GA1600070-robh@kernel.org> <17611183-f288-47fe-a5e1-91ee16168db0@linaro.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-VP6CJ8fN7Mq7yYfq63Ga" User-Agent: Evolution 3.44.4-0ubuntu2 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 --=-VP6CJ8fN7Mq7yYfq63Ga Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2024-03-22 at 08:22 -0500, Rob Herring wrote: >=20 > > > What stops you from passing fw_cfg not to UEFI FW? BTW, no actual VM > > > name was used in your posting, but now suddenly it is a talk about QE= MU. (Forgot to address the second part of that last time. No specific VMM was mentioned in the first place because this isn't VMM-specific) > > That would be possible. But not ideal. >=20 > Why not ideal? >=20 > To rephrase the question, why is it fine for UEFI to read the vmgenid > from fw_cfg, but the kernel can't use the same mechanism? Because fw_cfg an incestuous way to get data from the VMM into the BIOS (both SeaBIOS and UEFI). It's the way we pass the ACPI tables and things like that. It *isn't* designed as a general-purpose way of doing device discovery for use by various operating systems. I'm also not sure Firecracker, which is the VMM Sudan is working on, even *has* fw_cfg. Especially on ARM. If we're going to be forced to add some complicated device with MMIO and DMA just to be able to advertise the existence of a simple memory region, that's just as bad as being forced to expose it as an emulated PCI device. This is what DT is *for*. > The response > that you'd have to use UEFI to use fw_cfg makes no sense to me.=C2=A0The > only reason I can think of is just being lazy and wanting to have > minimal changes to some existing driver. It looks to me like you could > implement this entirely in userspace already with zero kernel or > binding changes. From a quick look, we already have a fw_cfg driver > exposing UUID (that's the same thing as vmgenid AIUI) to userspace, > and you can feed that back into the random pool. >=20 > I am concerned that we already have a mechanism and you want to add a > second way. When do we ever think that's a good idea? What happens=C2=A0 > on the next piece of fw_cfg data? We add yet another binding? No, because fw_cfg is a way for the VMM to give configuration information to the firmware. There's a clue in the name. The firmware then sets up ACPI tables or DT to pass information in a more coherent and structured fashion to general-purpose operating systems. And some VMMs *don't* use fw_cfg at all because for the minimal microvm case it's overkill. --=-VP6CJ8fN7Mq7yYfq63Ga Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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