[Xen-devel] Auto translated physmap feature

["Puthiyaparambil, Aravindh" <aravindh.puthiyaparambil@xxxxxxxxxx>]

If you use the auto translated physmap feature for a DomU, I understand
that the p2m conversion is done by Xen and not by referencing the p2m
table that is passed by the domain builder to the DomU. So with auto
translated physmap, the p2m table for the DomU lives in the Xen space
and not in the DomU space? Is it possible to use this feature in driver
domains?

I tried using this feature by adding "features =
'auto_translated_physmap'" in the DomU config file. The DomU dies with
the following error. Is this a known issue? I am on Xen x86_64
change-set 12898:37141c3a3d39.

Thanks,
Aravindh Puthiyaparambil 
Xen Development Team
Unisys, Tredyffrin PA

(XEN) mtrr: type mismatch for f0000000,1000000 old: write-back new:
write-combining
(XEN) sh error: shadow_remove_all_mappings(): can't find all mappings of
mfn 204971: c=00000001 t=00000000
(XEN) Unhandled page fault in domain 1 on VCPU 0 (ec=0001)
(XEN) Pagetable walk from ffff8000000060d8:
(XEN)  L4[0x100] = 0000000063d84063 5555555555555555
(XEN)  L3[0x000] = 0000000063d85067 5555555555555555
(XEN)  L2[0x000] = 0000000063d86067 5555555555555555 
(XEN)  L1[0x006] = 0000000063d7d067 5555555555555555
(XEN) domain_crash_sync called from entry.S
(XEN) Domain 1 (vcpu#0) crashed on cpu#3:
(XEN) ----[ Xen-3.0-unstable  x86_64  debug=y  Not tainted ]----
(XEN) CPU:    3
(XEN) RIP:    e033:[<ffffffff803d4043>]
(XEN) RFLAGS: 0000000000000246   CONTEXT: guest
(XEN) rax: ffff800000000000   rbx: 0000000000000000   rcx:
0000000000000023
(XEN) rdx: 0000000000000c1b   rsi: 0000000000000000   rdi:
ffffffff80106000
(XEN) rbp: ffffffff803ae000   rsp: ffffffff803c7f60   r8:
0000000000000000
(XEN) r9:  0000000000000000   r10: ffffffff80105000   r11:
0000000000001000
(XEN) r12: 0000000000000000   r13: 0000000000000000   r14:
0000000000000000
(XEN) r15: 0000000000000000   cr0: 000000008005003b   cr4:
00000000000026b0
(XEN) cr3: 0000000063c83000   cr2: ffff8000000060d8
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e02b   cs: e033
(XEN) Guest stack trace from rsp=ffffffff803c7f60:
(XEN)    0000000000000023 0000000000001000 0000000000000001
ffffffff803d4043
(XEN)    000000000000e030 0000000000010246 ffffffff803c7fa0
000000000000e02b
(XEN)    0000000000000023 ffffffff80111be0 0000000000000000
0000000000000000
(XEN)    0000000000000000 ffffffff803c90d8 ffff800000000000
ffff804000000000
(XEN)    00000007ffffffff 0000000000000000 0000000000000000
0000000000000000


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