[Xen-devel] Question about hvm disk io behavior

[陈进 <ciccinocj@xxxxxxxxx>]

Hi, I am currently doing some study about hvm IO behavior.

I encounter a strange thing that hvm tries to access a page owned to dom0 when it executes disk io instructions like "rep ins/outs".

Here is my console output message:

         (XEN) [M]emulate.c:384 ===Warning!! dst_ma=0x1ed0fa400, domain_id=0 rip=0xffffffff812a38fb size=0x200.

         (XEN) insns: f3 66 6d 5b. pite=0x80000000

domain id = 0 means it's a page of dom0 but rip is in the address space of domU, its instructions are f3 66 6d 5b.

I am confusing why hvm need to put its disk data into dom0 memory space, is it a shared page? what do they share with this page?

Thanks for any reply. 

--
陈进

电话：+86-21-51355360

复旦大学并行处理研究所

上海浦东新区张衡路825号，软件楼320

Jin Chen

Phone: +86-21-51355360

Room 320, Software Building

No. 825, Zhangheng Road

Pudong District, Shanghai

-- 
陈进

电话：+86-21-51355360

复旦大学并行处理研究所

上海浦东新区张衡路825号，软件楼320

Jin Chen

Phone: +86-21-51355360

Room 320, Software Building

No. 825, Zhangheng Road

Pudong District, Shanghai

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