Hi all,

I found that the HVM guest was often failed to create when I repeated to create and destroy a HVM guest. The following message was displayed.

Using config file "hvm.conf". Error: (1, 'Internal error', 'Error constructing guest OS')

I also found the message of Xen as follows.

(XEN) xencomm_paddr_to_maddr: called with bad memory address: 0x1e5b0000 -
iip=a00000010006fe50

This is a bug in xencomm_copy_from_guest(). In this function, because the condition of calling xencomm_copy_chunk_from() was wrong, it was called in an invalid destination address. The attached patch fixes it and also fixes xencomm_copy_to_guest().

Thanks, KAZ