RE: [Xen-devel] [PATCH][SVM] fix pae for guests on 32bit HV

["Woller, Thomas" <thomas.woller@xxxxxxx>]

> The current shadow code does not support PAE guests on the 
> PAE Xen. It's much harder given (compared with x64-64) the 
> limited bits in page_info.
> Should work on the 64-bit Xen. Anyway, we need to cleanly 
> kill such guests on the PAE Xen.
Now this does mean no NX support on PAE xen.

Attached patch simply turns off PAE if paging level < 4 in vt and svm. 

Tested win2003 EE on svm and vt, allows 32bit windows guests to boot
without shadow.c bug() crash.  

Only issue seen is if setting guest config memory >~4096 then the guest
does not boot, but does not crash the hv - stays in blocked state.  So,
I think that this solution is fine for now.  Svm shadows PAE and NX so
the code is slightly different.  
I'll post with signed-off if ok for vmx also.
thanks
Tom

Attachment: svm_vmx_pae32_off.patch
Description: svm_vmx_pae32_off.patch

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