Hi!
> From: Rafael J. Wysocki <[email protected]>
>
> Since we already pass the address of restore_registers() in the image header,
> we can also pass the value of the CR3 register from before the hibernation in
> the same way. This will allow us to avoid using init_level4_pgt page tables
> during the restore.
>
> Signed-off-by: Rafael J. Wysocki <[email protected]>
> @@ -253,10 +262,13 @@ int arch_hibernation_header_save(void *a
> {
> struct restore_data_record *rdr = addr;
>
> - if (max_size < sizeof(struct restore_data_record))
> + if (max_size < sizeof(*rdr))
> return -EOVERFLOW;
> rdr->jump_address = restore_jump_address;
> - rdr->control = (restore_jump_address ^ RESTORE_MAGIC);
> + rdr->cr3 = restore_cr3;
> + rdr->magic = RESTORE_MAGIC;
> + rdr->crc = 0;
> + rdr->crc = crc32_le(0, addr, sizeof(*rdr));
> return 0;
> }
No, I do not think I like that. I believe both -> control and -> crc
is just useless paranoia. Bitflip in this area is not going to be any
worse than bitflip anywhere else, we should not pretend this is
somehow "more important".
-> control should really be "protocol version"... probably should
contain some field that is easy to increment.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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