Re: [PATCH v2 7/7] mm: secretmem: add ability to reserve memory at boot
From: Mike Rapoport <rppt@kernel.org>
Date: 2020-07-27 17:11:20
Also in:
linux-arch, linux-arm-kernel, linux-fsdevel, linux-mm, linux-riscv, lkml, nvdimm
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:
quoted hunk ↗ jump to hunk
From: Mike Rapoport <redacted> 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 <redacted> --- 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
-- Sincerely yours, Mike.