On Fri, 21 Sep 2018, Chen Yu wrote:
> Currently there are mainly three bugs in 32bits system when doing
> hibernation:
> 1. The page copy code is not running in safe page, which might
> cause hang during resume.
> 2. There's no text mapping for the final jump address
> of the original kernel, which might cause the system jumping
> into illegal address and causes system hang during resume.
> 3. The restore kernel switches to its own kernel page table(swapper_pg_dir)
> rather than the original kernel page table after all the pages
> been copied back, which might cause invalid virtual-physical
> mapping issue during resume.
>
> To solve these problems:
>
> 1. Copy the code core_restore_code to a safe page, to avoid the instruction
> code been overwritten when image kernel pages are being copied.
> 2. Set up temporary text mapping for the image kernel's jump address,
> so that after all the pages have been copied back, the system could
> jump to this address.
> 3. Switch to the original kernel page table during resume.
>
> Furthermore, MD5 hash check for e820 map is also backported from 64bits
> system.
>
> In order to make this patch set more readable, these fixes are splitted
> into several sub patches.
>
> And use CONFIG_X86_64 to control the common code to be 'activated' for
> 32 bit system during each sub-patch for better maintaining.
Acked-by: Thomas Gleixner <t...@linutronix.de>
Rafael, it's all yours :)
Thanks,
tglx
