Re: [PATCH 2/3] OvmfPkg: introduce FD_SIZE_4MB (mainly) for Windows HCK

[Jordan Justen <jordan.l.justen@intel.com>]

On 2017-05-01 03:51:42, Laszlo Ersek wrote:
> On 04/30/17 23:16, Jordan Justen wrote:
> > What are the chances
> > that 248k will cover it? Unfortunately (or fortunately), no one I've
> > asked seem to know of any plans for the requirement to increase beyond
> > 120k.
> 
> Again, I agree this is a valid concern; there's no way to guarantee
> 248KB will be enough for 7 years (I keep saying 7 years, that's
> important to me, others might care about a different time frame).
> 
> Given that 120-128KB has gone from "generous" to "required" in 2.5
> years, I feel that providing 248KB for the next 7 years (thereby more
> than quadrupling OVMF's current offer) is the low water mark for "prudent".

Since we are trying to predict the future, I don't think we should
stop just shy of a power-of-two. I don't know where the 120k number
comes from, but I don't think we should bet on the next power-of-two
minus 8k.

Regarding the event log, it has been ignored in OVMF, but I'd like to
ask around a bit to see if it could be useful to have more than 4k.

> If you'd like us to go, say, 504KB live varstore, 1MB NV, and 5MB or 6MB
> total, I'm game.

Uh, no. I'd rather go with 128k, and I'd also rather stay with 2MB. :)

-Jordan