From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mx.groups.io; dkim=pass header.i=@infradead.org header.s=merlin.20170209 header.b=1g9zYcnm; spf=none, err=permanent DNS error (domain: merlin.srs.infradead.org, ip: 205.233.59.134, mailfrom: batv+68c2678543dae80936a2+5784+infradead.org+dwmw2@merlin.srs.infradead.org) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by groups.io with SMTP; Tue, 25 Jun 2019 04:27:33 -0700 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date:To:From:Subject:Message-ID:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=j7MRi9xrB8OobkjgoePj8LtaLKNCgooarEldsyVIkgY=; b=1g9zYcnmKs4LETEkYjwBZgUjX LG+bIgANICpLCDKtE47ASiz54WY5/K8DboyDbzbruc3ApGkjrHuz7kna7wcvunndRqwjW8pQxNHE7 +IVu6Bv6ItqNx0M7wxkLfugMcJ7wltQ59cTgHZmwfLnzSoS+1YTLiUHbB71Ky3/TSMxybAFAbNzpk O75kNSRhlWm4aaCeIOiUID5N59tR4DJlg1Koi+zXDx8lmwWEkHU06NTuzmEiyEWG7TJXxNMrXNRqt Mhu7WTfurUs3THmDocN7f9DGSECZJwajrxmll0qO5W1GNJiZdG1FpZcZrtDquMycs/0kWTxw7kcw9 ZRUYLJvMw==; Received: from 54-240-197-235.amazon.com ([54.240.197.235] helo=freeip.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hfjbm-0007PB-Hb; Tue, 25 Jun 2019 11:27:30 +0000 Message-ID: <4f76f3ec330605027c933c616f4d385b417913b6.camel@infradead.org> Subject: Re: [edk2-devel] [PATCH 6/7] MdeModulePkg/UefiBootManagerLib: describe VirtIO devices correctly From: "David Woodhouse" To: "Ni, Ray" , "devel@edk2.groups.io" , "lersek@redhat.com" Date: Tue, 25 Jun 2019 12:27:27 +0100 In-Reply-To: <734D49CCEBEEF84792F5B80ED585239D5C1EF4F5@SHSMSX104.ccr.corp.intel.com> References: <20190621223156.701502-1-dwmw2@infradead.org> <20190621223156.701502-6-dwmw2@infradead.org> <3d62cecb-d235-2b7e-3342-b1f6e4a619c6@redhat.com> <734D49CCEBEEF84792F5B80ED585239D5C1EDC86@SHSMSX104.ccr.corp.intel.com> <6dc5628441563b14a5fc2dce9cdc1526cf52f411.camel@infradead.org> <734D49CCEBEEF84792F5B80ED585239D5C1EEFDC@SHSMSX104.ccr.corp.intel.com> <90ef315d34f46422690b3ec0235a7c058ff1fd98.camel@infradead.org> <734D49CCEBEEF84792F5B80ED585239D5C1EF35C@SHSMSX104.ccr.corp.intel.com> <734D49CCEBEEF84792F5B80ED585239D5C1EF4F5@SHSMSX104.ccr.corp.intel.com> X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.1 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html X-Groupsio-MsgNum: 42809 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-zucCeqUWX2MjPXdRcc/z" --=-zucCeqUWX2MjPXdRcc/z Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2019-06-25 at 09:56 +0000, Ni, Ray wrote: > David, > Thanks for pointing that patch. >=20 > Now I understand it. > Normally it's the CSM16 code that builds the boot descriptions for legacy= boot options > and LegacyBootManagerLib consumes that boot descriptions. >=20 > But in your case, LegacyBios driver builds the boot descriptions for Virt= Io devices and > LegacyBootManagerLib consumes that boot descriptions. >=20 > The flow is like below: (I understand there is no VirtIoBootOptionDescrip= tionHandler() in > your current patch. But I think we could write such handler and register = it through > EfiBootManagerRegisterBootDescriptionHandler() API) >=20 > *module* *UefiBootManagerLib* > LegacyBios -> GetBootOptionDescription() -> VirtIoBootOptionDescriptionHa= ndler() > BdsDxe -> GetBootOptionDescription() -> VirtIoBootOptionDescriptionHandle= r() >=20 > So instead of routing to *UefiBootManagerLib* GetBootOptionDescription(), > why not you directly call VirtIoBootOptionDescriptionHandler() from Legac= yBios? >=20 > I understand from functionality perspective, it makes no difference. > But I care about that because it avoids LegacyBios unnecessarily depends = on > *UefiBootManagerLib*. >=20 > What do you think? Forget VirtIO, look only at the previous two patches. MdeModulePkg/UefiBootManagerLib: export EfiBootManagerGetBootDescriptio= n() OvmfPkg/LegacyBiosDxe: Use EfiBootManagerGetBootDescription() Their commit messages (attempt to) set this out fairly clearly. In BmGetBootDescription() we already have a whole pile of special cases for things including NVMe, USB, etc. to get descriptive strings that match a given BlockIo handle. It's bad enough that that functionality exists in that form already, rather than being provided in a clean and generic fashion by the block device driver itself somehow. I absolutely did not want to reproduce it all, just to get meaningful strings for the Legacy boot targets from the same block devices. Hence a tweaking, renaming and exporting the existing BmGetBootDescription() function so I can use it from LegacyBbs code. Adding another special case for VirtIO alongside all the other special cases that were already in BmGetBootDescription (now called EfiBootManagerGetBootDescription()) is not really the important part here. Is there a particular problem with having LegacyBios depend on UefiBootManagerLib? The code in BmDescription.c is actually fairly standalone =E2=80=94 should we move it out into its *own* library so that i= t can be used from both places? That seems like overkill to me, when our long term plan really ought to be to kill it with fire and let block device drivers provide their own descriptive strings through a standard protocol. --=-zucCeqUWX2MjPXdRcc/z Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q 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