[SeaBIOS] varlow/extrastack vs code
Paolo Bonzini
pbonzini at redhat.com
Fri Feb 17 14:11:32 CET 2017
On 14/02/2017 22:50, Gerd Hoffmann wrote:
> Hi,
>
>> Just for historical perspective - the reason I think qemu didn't
>> implement the pam "read from rom and write to memory" mode is that I
>> don't think there's a good way to emulate that with page tables (and
>> the range needs to be executable so just making it all device memory
>> isn't practical).
>
> A while back kvm got support for memory slots which allow read access
> and vmexit on write access. Flash emulation needs this, and I think it
> is possible to also implement the "read from rom and write to memory"
> mode using that.
It would be very slow of course, but if the only writes are to
TimerLast, perhaps that would work?
Paolo
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