Groups > linux.kernel > #1631920

Re: [PATCH v5 31/32] x86: Add sysfs support for Secure Memory Encryption

From	Dave Young <dyoung@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v5 31/32] x86: Add sysfs support for Secure Memory Encryption
Date	2017-04-27 09:30 +0200
Message-ID	<tAM2d-5H5-1@gated-at.bofh.it> (permalink)
References	<txTMB-1zl-13@gated-at.bofh.it> <tyOKS-2xl-9@gated-at.bofh.it> <tyOKS-2xl-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

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?

Thanks
Dave

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH v5 31/32] x86: Add sysfs support for Secure Memory  Encryption Dave Young <dyoung@redhat.com> - 2017-04-27 09:30 +0200
  Re: [PATCH v5 31/32] x86: Add sysfs support for Secure Memory  Encryption Dave Hansen <dave.hansen@intel.com> - 2017-04-27 18:00 +0200
    Re: [PATCH v5 31/32] x86: Add sysfs support for Secure Memory  Encryption Dave Young <dyoung@redhat.com> - 2017-04-28 07:40 +0200

csiph-web