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xen-ppc-devel
Re: [XenPPC] Where is htab?
>> Looking at xlate.c, the htab and entries are access in following way:
>>
>> struct vcpu *v = get_current();
>> struct domain *d = v->>domain;
>> struct domain_htab *htab = &d->>arch.htab;
>> union pte volatile *pte;
>>
>> pte = &htab->map[ptex];
> htab->map is the HTAB, remember it is treated like an array.
>>
>>
>> I've inserted this code into xen/arch/powerpc/domctl.c, just to see
>> if I could recognize
>> the htab before mapping back to user space. The 'current domain'
>> has some entries that
>> could be htab. However, the guest domain always contains 0s.
>>
>>
>> current domain:
>> (XEN) XEN_DOMCTL_getshadowlist:
>> (XEN) dd->>arch.htab.map: 0x0000000002000000
>> (XEN) rma_base_mfn: 0x0000000000004000 rma_size_mfn:
>> 0x0000000000004000
>> (XEN) pte: 0x0000000002000800 vsid: 0x0000181a80047001 rpn:
>> 0x000000000349b196
>> (XEN) pte: 0x0000000002000810 vsid: 0x0000000000000000 rpn:
>> 0x0000000000000000
>> (XEN) pte: 0x0000000002000820 vsid: 0x0000000000000000 rpn:
>> 0x0000000000000000
>>
>> guest domain:
>> (XEN) d->arch.htab.map: 0x0000000000100000
>> (XEN) rma_base_mfn2: 0x000000000001c000 rma_size_mfn2:
>> 0x0000000000004000
>> (XEN) pte: 0x0000000000100800 vsid: 0x0000000000000000 rpn:
>> 0x0000000000000000
>> (XEN) pte: 0x0000000000100810 vsid: 0x0000000000000000 rpn:
>> 0x0000000000000000
>> (XEN) pte: 0x0000000000100820 vsid: 0x0000000000000000 rpn:
>> 0x0000000000000000
> How early in the guest run is this?
Guest domain is up and running. Printing code is invoked via 'xm save'.
> Remember the "h" in htab stands for Hash, though it is odd to see a
> whole PTEG (group of 8 PTEs) to be clear for Linux (and you are only
> showing 3).
>>
>>
>> 1) What is the arch.htab.map address? I thought Xen ran with
>> translate off and without RMA?
> Xen runs that way but the domains run in RMA while in Real Mode and
> transalted (uses htab) when not.
> The when we create a domain we allocate the htab it will remain 0
> until the domain creates the first entries. The first entries in
> Linux are created by the domain while it runs in the RMA.
> -JX
After reading your note, I tried printing all non-zero rpns in guest domain.
There are lots- in fact 'bios' got a watchdog timeout and reverted out of SLOF
while printing...
Think I was spooked yesterday, since even page 0 had no rpn address,
and I thought every domain had to have 2 or 4 pages setup beginning at 0 ?
Thanks
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