From: Mike Rapoport <rppt@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
linux-mm@kvack.org, "H. Peter Anvin" <hpa@zytor.com>,
Christopher Lameter <cl@linux.com>,
Idan Yaniv <idan.yaniv@ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Elena Reshetova <elena.reshetova@intel.com>,
linux-arch@vger.kernel.org, Tycho Andersen <tycho@tycho.ws>,
linux-nvdimm@lists.01.org, Will Deacon <will@kernel.org>,
x86@kernel.org, Matthew Wilcox <willy@infradead.org>,
Mike Rapoport <rppt@linux.ibm.com>,
Ingo Molnar <mingo@redhat.com>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Arnd Bergmann <arnd@arndb.de>,
James Bottomley <jejb@linux.ibm.com>,
Borislav Petkov <bp@alien8.de>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andy Lutomirski <luto@kernel.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Dan Williams <dan.j.williams@intel.com>,
linux-arm-kernel@lists.infradead.org, linux-api@vger.kernel.org,
linux-riscv@lists.infradead.org,
Palmer Dabbelt <palmer@dabbelt.com>,
linux-fsdevel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Mike Rapoport <rppt@kernel.org>
Subject: [PATCH v2 7/7] mm: secretmem: add ability to reserve memory at boot
Date: Mon, 27 Jul 2020 19:29:35 +0300 [thread overview]
Message-ID: <20200727162935.31714-8-rppt@kernel.org> (raw)
In-Reply-To: <20200727162935.31714-1-rppt@kernel.org>
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
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next prev parent reply other threads:[~2020-07-27 16:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-27 16:29 [PATCH v2 0/7] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2020-07-27 16:29 ` [PATCH v2 1/7] mm: add definition of PMD_PAGE_ORDER Mike Rapoport
2020-07-27 16:29 ` [PATCH v2 2/7] mmap: make mlock_future_check() global Mike Rapoport
2020-07-27 16:29 ` [PATCH v2 3/7] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2020-07-30 16:22 ` Catalin Marinas
2020-07-30 20:44 ` Mike Rapoport
2020-07-31 14:10 ` Catalin Marinas
2020-07-31 14:29 ` Mark Rutland
2020-07-31 16:22 ` Catalin Marinas
2020-07-27 16:29 ` [PATCH v2 4/7] arch, mm: wire up memfd_secret system call were relevant Mike Rapoport
2020-07-27 17:25 ` Arnd Bergmann
2020-07-27 16:29 ` [PATCH v2 5/7] mm: secretmem: use PMD-size pages to amortize direct map fragmentation Mike Rapoport
2020-07-27 16:29 ` [PATCH v2 6/7] mm: secretmem: add ability to reserve memory at boot Mike Rapoport
2020-07-27 16:29 ` Mike Rapoport [this message]
2020-07-27 17:11 ` [PATCH v2 7/7] " Mike Rapoport
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