On 4/27/2017 2:25 AM, Dave Young wrote: > On 04/21/17 at 02:55pm, Dave Hansen wrote: >> On 04/18/2017 02:22 PM, Tom Lendacky wrote: >>> Add sysfs support for SME so that user-space utilities (kdump, etc.) can >>> determine if SME is active. >>> >>> A new directory will be created: >>> /sys/kernel/mm/sme/ >>> >>> And two entries within the new directory: >>> /sys/kernel/mm/sme/active >>> /sys/kernel/mm/sme/encryption_mask >> >> Why do they care, and what will they be doing with this information? > > Since kdump will copy old memory but need this to know if the old memory > was encrypted or not. With this sysfs file we can know the previous SME > status and pass to kdump kernel as like a kernel param. > > Tom, have you got chance to try if it works or not? Sorry, I haven't had a chance to test this yet. Thanks, Tom > > Thanks > Dave >
