On 4/28/25 14:26, Ashish Kalra wrote: > From: Ashish Kalra <[email protected]> > > 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. > > There is a bug in this additional check for GHCB page contained > within a huge page which causes any shared page just below the > per-cpu GHCB getting skipped from being transitioned back to private > before kdump preparation which subsequently causes a 0x404 #VC > exception when this shared page is accessed later while dumping guest > memory during vmcore generation via kdump. > > Correct the detection and handling of GHCB pages contained within > a huge page. > > Cc: [email protected] > Fixes: 3074152e56c9 ("x86/sev: Convert shared memory back to private on > kexec") > Signed-off-by: Ashish Kalra <[email protected]>
Reviewed-by: Tom Lendacky <[email protected]> > --- > arch/x86/coco/sev/core.c | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-) >
