Date: Mon, 19 Aug 2013 20:12:08 -0700 From: Tim Kientzle <tim@kientzle.com> To: Warner Losh <imp@bsdimp.com> Cc: =?iso-8859-1?Q?Dag-Erling_Sm=F8rgrav?= <des@des.no>, secteam@freebsd.org, Mark R V Murray <mark@grondar.org>, FreeBSD-arch Arch <freebsd-arch@freebsd.org> Subject: Re: random(4) plugin infrastructure for mulitple RNG in a modular fashion Message-ID: <B88139AA-B134-4E11-BE4D-B139A311D45F@kientzle.com> In-Reply-To: <551C488B-D56A-4E9F-8617-17B96D3E7677@bsdimp.com> References: <20130807183112.GA79319@dragon.NUXI.org> <86pptfnu33.fsf@nine.des.no> <20130815231713.GD76666@x96.org> <20130816002625.GE76666@x96.org> <9B274F48-0C88-4117-BEAC-1A555772A3C5@grondar.org> <86a9kf733d.fsf@nine.des.no> <0C97B866-A169-4141-8368-AA7F5B5382F4@grondar.org> <861u5r71zi.fsf@nine.des.no> <892B11BD-396D-4F82-B97C-753F72CA494D@grondar.org> <86r4dr5j3p.fsf@nine.des.no> <4C1BD77C-8C6B-4044-9285-5978A3BC4B70@kientzle.com> <537622E1-F785-4BFA-B829-09DCDB484606@grondar.org> <932AB5CA-778E-438D-8FD3-8C0F29F3D117@kientzle.com> <F908BF80-538B-4363-ACCC-3D860CBEE359@grondar.org> <71A92486-2213-421E-B3D2-E55816C18924@bsdimp.com> <D218D7B1-AB8B-4A80-A822-A8F0AB1EF43C@grondar.org> <551C488B-D56A-4E9F-8617-17B96D3E7677@bsdimp.com>
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On Aug 19, 2013, at 3:01 PM, Warner Losh wrote: >=20 > On Aug 19, 2013, at 1:31 AM, Mark R V Murray wrote: >=20 >>=20 >> On 19 Aug 2013, at 08:18, Warner Losh <imp@bsdimp.com> wrote: >>> If we're going to allow passthrough, we should require the kernel = config to explicitly do something to get pass through. >>>=20 >>> nodevice yarrow >>> device random_passthrough >>>=20 >>> would be my suggestion. >>=20 >> I don't think it will sell; folks are asking for GENERIC with a = run-time switch to flip between the raw HW generator output and a SW = mixer/conditioner. I've not heard anyone asking for a run-time switch in GENERIC. I would suggest making that a longer-term option and having the choice of mixer/conditioner (Yarrow, Fortuna, or HW passthrough) be a compile-time choice for now. >>> I'd go so far as to say that if you have random in your kernel, then = you need to specify some "filter" or you get a compile-time error. = Specifying yarrow via DEFAULTS or std.foo is fine by me, since both of = those can be overriden fairly easily.... I'd also think we'd want to = FAIL_PANIC or FAIL_BLOCKING, and have that choice hard wired at some = level too, to be explicit about things. But maybe that's gilding things = a bit too much and a tunable would suffice=85 >>=20 >> Won't sell. Folks are saying they want the choice of the raw output. = In GENERIC. I've not heard anyone asking for raw output in GENERIC. I've heard people ask for the ability to compile customized kernels with raw output.
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