Re: [PATCH v3 0/2] x86/boot/64: Avoid mapping reserved ranges in early page tables.

[Steve Wahl]

It's been a while on this patch set; two weeks ago Kirill added acks,
no movement since.  Is there anything I need to be doing on my part to
move this forward?

Thanks!

--> Steve Wahl 

On Tue, Sep 24, 2019 at 04:03:22PM -0500, Steve Wahl wrote:
> This patch set narrows the valid space addressed by the page table
> level2_kernel_pgt to only contain ranges checked against the "usable
> RAM" list provided by the BIOS.
> 
> Prior to this, some larger than needed mappings were occasionally
> crossing over into spaces marked reserved, allowing the processor to
> access these reserved spaces, which were caught by the hardware and
> caused BIOS to halt on our platform (UV).
> 
> Changes since v1:
> 
> * Cover letter added because there's now two patches.
> 
> * Patch 1: Added comment and re-worked changelog text.
> 
> * Patch 2: New change requested by Dave Hansen to handle the case that
>   the mapping of the last PMD page for the kernel image could cross a
>   reserved region boundary.
> 
> Changes since v2:
> 
> * Patch 1: Added further inline comments.
> * Patch 2: None.
> 
> Steve Wahl (2):
>   x86/boot/64: Make level2_kernel_pgt pages invalid outside kernel area.
>   x86/boot/64: round memory hole size up to next PMD page.
> 
>  arch/x86/boot/compressed/misc.c | 25 +++++++++++++++++++------
>  arch/x86/kernel/head64.c        | 22 ++++++++++++++++++++--
>  2 files changed, 39 insertions(+), 8 deletions(-)
> 
> -- 
> 2.21.0
> 
> 
> -- 
> Steve Wahl, Hewlett Packard Enterprise

-- 
Steve Wahl, Hewlett Packard Enterprise