| Message ID | 20200727162935.31714-8-rppt@kernel.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | mm: introduce memfd_secret system call to create "secret" memory areas | expand |
Oops, something went wrong with the rebase, this should have been squashed into the previous patch... On Mon, Jul 27, 2020 at 07:29:35PM +0300, Mike Rapoport wrote: > From: Mike Rapoport <rppt@linux.ibm.com> > > Taking pages out from the direct map and bringing them back may create > undesired fragmentation and usage of the smaller pages in the direct > mapping of the physical memory. > > This can be avoided if a significantly large area of the physical memory > would be reserved for secretmem purposes at boot time. > > Add ability to reserve physical memory for secretmem at boot time using > "secretmem" kernel parameter and then use that reserved memory as a global > pool for secret memory needs. > > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> > --- > Documentation/admin-guide/kernel-parameters.txt | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index fb95fad81c79..6f3c2f28160f 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -4548,6 +4548,10 @@ > Format: integer between 0 and 10 > Default is 0. > > + secretmem=n[KMG] > + [KNL,BOOT] Reserve specified amount of memory to > + back mappings of secret memory. > + > skew_tick= [KNL] Offset the periodic timer tick per cpu to mitigate > xtime_lock contention on larger systems, and/or RCU lock > contention on all systems with CONFIG_MAXSMP set. > -- > 2.26.2 >
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index fb95fad81c79..6f3c2f28160f 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4548,6 +4548,10 @@ Format: integer between 0 and 10 Default is 0. + secretmem=n[KMG] + [KNL,BOOT] Reserve specified amount of memory to + back mappings of secret memory. + skew_tick= [KNL] Offset the periodic timer tick per cpu to mitigate xtime_lock contention on larger systems, and/or RCU lock contention on all systems with CONFIG_MAXSMP set.