Re: Another plex86 technical thing

[Kevin P. Lawton]

Jens Nerche wrote:

> point of view). Hope I understood and explained it correctly.
> But the point about I'm pondering is: how to detect the point of time a
> rescan is necessary? Test the D-bit after every instruction is too costly,
> but larger time windows may be too large!??

The only time we care is before transferring execution to
the guest, which is a good time to check and possibly dump
the vcode cache and rescan.

Speaking of D and A-bits, when a (virtualized) guest read or
write hits a page directory or page table, and when the guest
reloads CR3; that's a good time to update guest D & A bits
in the PDE/PTE's.

> P.S. I'm planning to write some doc about our SBE next days. Have to scan
> Kevins virtualization paper and mailing list archiv for that - or has somebody
> a summary of all ideas? Kevin?

That paper is the closest thing I have to a summary.  Isn't
the source code self-documenting? :^)