2dd57d3415
Patch series "device-dax: Support sub-dividing soft-reserved ranges", v5.
The device-dax facility allows an address range to be directly mapped
through a chardev, or optionally hotplugged to the core kernel page
allocator as System-RAM. It is the mechanism for converting persistent
memory (pmem) to be used as another volatile memory pool i.e. the current
Memory Tiering hot topic on linux-mm.
In the case of pmem the nvdimm-namespace-label mechanism can sub-divide
it, but that labeling mechanism is not available / applicable to
soft-reserved ("EFI specific purpose") memory [3]. This series provides a
sysfs-mechanism for the daxctl utility to enable provisioning of
volatile-soft-reserved memory ranges.
The motivations for this facility are:
1/ Allow performance differentiated memory ranges to be split between
kernel-managed and directly-accessed use cases.
2/ Allow physical memory to be provisioned along performance relevant
address boundaries. For example, divide a memory-side cache [4] along
cache-color boundaries.
3/ Parcel out soft-reserved memory to VMs using device-dax as a security
/ permissions boundary [5]. Specifically I have seen people (ab)using
memmap=nn!ss (mark System-RAM as Persistent Memory) just to get the
device-dax interface on custom address ranges. A follow-on for the VM
use case is to teach device-dax to dynamically allocate 'struct page' at
runtime to reduce the duplication of 'struct page' space in both the
guest and the host kernel for the same physical pages.
[2]: http://lore.kernel.org/r/20200713160837.13774-11-joao.m.martins@oracle.com
[3]: http://lore.kernel.org/r/157309097008.1579826.12818463304589384434.stgit@dwillia2-desk3.amr.corp.intel.com
[4]: http://lore.kernel.org/r/154899811738.3165233.12325692939590944259.stgit@dwillia2-desk3.amr.corp.intel.com
[5]: http://lore.kernel.org/r/20200110190313.17144-1-joao.m.martins@oracle.com
This patch (of 23):
In preparation for adding a new numa= option clean up the existing ones to
avoid ifdefs in numa_setup(), and provide feedback when the option is
numa=fake= option is invalid due to kernel config. The same does not need
to be done for numa=noacpi, since the capability is already hard disabled
at compile-time.
Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brice Goglin <Brice.Goglin@inria.fr>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Jia He <justin.he@arm.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Hulk Robot <hulkci@huawei.com>
Cc: Jason Yan <yanaijie@huawei.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Link: https://lkml.kernel.org/r/160106109960.30709.7379926726669669398.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lkml.kernel.org/r/159643094279.4062302.17779410714418721328.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lkml.kernel.org/r/159643094925.4062302.14979872973043772305.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_NUMA_H
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#define _ASM_X86_NUMA_H
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#include <linux/nodemask.h>
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#include <linux/errno.h>
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#include <asm/topology.h>
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#include <asm/apicdef.h>
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#ifdef CONFIG_NUMA
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#define NR_NODE_MEMBLKS (MAX_NUMNODES*2)
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/*
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* Too small node sizes may confuse the VM badly. Usually they
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* result from BIOS bugs. So dont recognize nodes as standalone
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* NUMA entities that have less than this amount of RAM listed:
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*/
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#define NODE_MIN_SIZE (4*1024*1024)
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extern int numa_off;
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/*
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* __apicid_to_node[] stores the raw mapping between physical apicid and
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* node and is used to initialize cpu_to_node mapping.
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*
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* The mapping may be overridden by apic->numa_cpu_node() on 32bit and thus
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* should be accessed by the accessors - set_apicid_to_node() and
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* numa_cpu_node().
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*/
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extern s16 __apicid_to_node[MAX_LOCAL_APIC];
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extern nodemask_t numa_nodes_parsed __initdata;
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extern int __init numa_add_memblk(int nodeid, u64 start, u64 end);
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extern void __init numa_set_distance(int from, int to, int distance);
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static inline void set_apicid_to_node(int apicid, s16 node)
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{
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__apicid_to_node[apicid] = node;
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}
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extern int numa_cpu_node(int cpu);
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#else /* CONFIG_NUMA */
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static inline void set_apicid_to_node(int apicid, s16 node)
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{
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}
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static inline int numa_cpu_node(int cpu)
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{
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return NUMA_NO_NODE;
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}
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#endif /* CONFIG_NUMA */
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#ifdef CONFIG_X86_32
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# include <asm/numa_32.h>
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#endif
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#ifdef CONFIG_NUMA
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extern void numa_set_node(int cpu, int node);
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extern void numa_clear_node(int cpu);
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extern void __init init_cpu_to_node(void);
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extern void numa_add_cpu(int cpu);
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extern void numa_remove_cpu(int cpu);
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#else /* CONFIG_NUMA */
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static inline void numa_set_node(int cpu, int node) { }
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static inline void numa_clear_node(int cpu) { }
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static inline void init_cpu_to_node(void) { }
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static inline void numa_add_cpu(int cpu) { }
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static inline void numa_remove_cpu(int cpu) { }
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#endif /* CONFIG_NUMA */
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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void debug_cpumask_set_cpu(int cpu, int node, bool enable);
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#endif
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#ifdef CONFIG_NUMA_EMU
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#define FAKE_NODE_MIN_SIZE ((u64)32 << 20)
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#define FAKE_NODE_MIN_HASH_MASK (~(FAKE_NODE_MIN_SIZE - 1UL))
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int numa_emu_cmdline(char *str);
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#else /* CONFIG_NUMA_EMU */
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static inline int numa_emu_cmdline(char *str)
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{
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return -EINVAL;
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}
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#endif /* CONFIG_NUMA_EMU */
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#endif /* _ASM_X86_NUMA_H */
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