On Tue, May 06, 2025 at 06:35:29PM +0000, Ashish Kalra wrote:
> From: Ashish Kalra <ashish.ka...@amd.com>
>
> When the shared pages are being made private during kdump preparation
> there are additional checks to handle shared GHCB pages.
>
> These additional checks include handling the case of GHCB page being
> contained within a huge page.
>
> The check for handling the case of GHCB contained within a huge
> page incorrectly skips a page just below the GHCB page from being
> transitioned back to private during kdump preparation.
>
> This skipped page causes a 0x404 #VC exception when it is accessed
> later while dumping guest memory during vmcore generation via kdump.
>
> Correct the range to be checked for GHCB contained in a huge page.
> Also ensure that the skipped huge page containing the GHCB page is
> transitioned back to private by applying the correct address mask
> later when changing GHCBs to private at end of kdump preparation.
>
> Fixes: 3074152e56c9 ("x86/sev: Convert shared memory back to private on
> kexec")
> Cc: sta...@vger.kernel.org
> Signed-off-by: Ashish Kalra <ashish.ka...@amd.com>
> ---
> arch/x86/coco/sev/core.c | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)
Ok, I've pushed both patches here:
https://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git/log/?h=tip-x86-urgent-sev
Please have those who are affected by the issues test and report back.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
