RE: [Xen-devel] [PATCH] support HVM guests with more than 3.75G memory

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

>Interesting - the crash is in the [optional] 'guess_wrmap' function
>which is trying to fast path the lookup of a particular va.  Can you 
>try temporarily disabling this optimization and retrying? Just edit 
>xen/include/asm-x86/shadow2.c to replace 
>
>#define SHADOW2_OPTIMZATIONS 0x03 
>
>with 
>
>#define SHADOW2_OPTIMZATIONS 0x02 
>

Your suggestion works for me, and windows 2003 server can boot with 5G
memory on 64bit xen.
But after I played with it for some time, qemu dm window disappeared,
and xen console reported:

(XEN) sh2 error: sh2_remove_shadows(): can't find all shadows of mfn
1b2ddd (shadow2_flags=00000100)
(XEN) domain_crash called from shadow2-common.c:2251
(XEN) Domain 8 (vcpu#0) crashed on cpu#3:
(XEN) ----[ Xen-3.0-unstable    Not tainted ]----
(XEN) CPU:    3
(XEN) RIP:    0008:[<0000000080862ca2>]
(XEN) RFLAGS: 0000000000010256   CONTEXT: hvm
(XEN) rax: 0000000067e97001   rbx: 0000000000000000   rcx:
0000000000000010
(XEN) rdx: 00000000ba482b68   rsi: 0000000000000000   rdi:
00000000f7aa82a0
(XEN) rbp: 00000000ba482b94   rsp: 00000000ba482b54   r8:
0000000000000000
(XEN) r9:  0000000000000000   r10: 0000000000000000   r11:
0000000000000000
(XEN) r12: 0000000000000000   r13: 0000000000000000   r14:
0000000000000000
(XEN) r15: 0000000000000000   cr0: 0000000080010031   cr3:
00000000001a17a0
(XEN) ds: 0023   es: 0023   fs: 0030   gs: 0000   ss: 0010   cs: 0008
(XEN) sh2_update_paging_modes: postponing determination of shadow2 mode
(XEN) vmx_do_launch(): GUEST_CR3<=001a17a0, HOST_CR3<=222b8b000


>
>and recompile. 
>
>It'd also be good to see if you can reproduce the above error on a 
>guest with < 4G memory. 
>

With less than 4G RAM, I didn't see this error.

Thanks
-Xin

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