Rod,

On 09/18/13 01:24, Jordan Justen wrote:
> QEMU 1.6 enables using KVM READONLY memory regions. There
> appears to be a bug when page tables are stored in the
> READONLY memory region. To work-around this, we create
> page table entries in RAM. Since RAM is present in QEMU/KVM
> without any initialization, this is easily accomplished
> for OVMF.
> 
> Since the firmware-device no longer needs to store 24KB of
> uncompressed page table data, we also reclaim nearly all
> of that for use with OVMF's compressed firmware.

Can you please test this series on your AMD machine? Your previous
config should work (qemu-1.6, recent (3.10+ ?) kernel, KVM enabled).

If the series doesn't help on AMD, IMO that should *not* block this
series. However if it fixes the AMD case too, then maybe one of the
commit messages could mention that.

CC'ing Paolo & Gleb, and also here's a reference into the earlier
discussion:

http://thread.gmane.org/gmane.comp.bios.tianocore.devel/3961

In that thread I think I tested this series on AMD (then-available from
Jordan's tree) and it technically fixed the problem on SVM too, but it
seemed to incur (or expose) a ~40 sec busy loop at startup, with many
EXIT_INTRs in KVM.

http://thread.gmane.org/gmane.comp.bios.tianocore.devel/3961/focus=3998

But, again, if this symptom persists on SVM, I don't think it should
block this series.

I'm adding it to my review queue of course.

Thanks!
Laszlo


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