Jeremy Fitzhardinge escreveu:
Glauber de Oliveira Costa wrote:
I think the idea you gave me earlier of using probe_kernel_address could
work. Xen/lguest/put_yours_here that won't use an ebda would then have
to unmap the page, to make sure a read would fault.
Hm, the memory might be mapped anyway, but we could make sure its all
zero. discover_ebda should be able to deal with that OK.
J
Indeed, as the EBDA_ADDR_POINTER is not aligned, this may work even better.
It seems to me safe to assume that if we read zero on that line:
ebda_addr = *(unsigned short *)__va(EBDA_ADDR_POINTER);
We could just do ebda_size = 0 and go home happy, skipping the rest of
the process.
Andi, are you okay with it ?
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