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xen-devel
RE: [Xen-devel] guest attempted write to read-only memory page.
>From: Tian, Kevin
>Sent: Monday, December 22, 2008 9:11 PM
>>
>>Possibly we should silence the shadow code too, at least
>>perhaps while in
>>real mode or for a certain EIP range.
>>
>
>I'm not sure that's the right fix. Why is write access to rom disabled
>before rom scan when etherboot is known to have write requirement?
>
>#ifdef HVMASSIST
> call _enable_rom_write_access
> call _clobber_entry_point
> call _copy_e820_table
> call smbios_init
> call _disable_rom_write_access
>#endif
>
> call _init_boot_vectors
>
> mov cx, #0xc800 ;; init option roms
> mov ax, #0xe000
> call rom_scan
>
>Should we move disable action to post rom_scan? If shadow warning
>is simply silenced for such case, it seems breaking the purpose of
>disable_dom_write_access...
>
I make a quick test, that warning disappears after moving disable
action post rom_scan. But I haven't found the place triggering such
write violation, as in previous revision write access is also disabled
before rom_scan. It could come from recent bochs update on
expansion rom part by 18931.
Thanks,
Kevin
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