Commit f3cd4c86 authored Apr 06, 2020 by Baoquan He Committed by Linus Torvalds Apr 07, 2020

mm/memory_hotplug.c: only respect mem= parameter during boot stage



In commit 357b4da5 ("x86: respect memory size limiting via mem=
parameter") a global varialbe max_mem_size is added to store the value
parsed from 'mem= ', then checked when memory region is added.  This truly
stops those DIMMs from being added into system memory during boot-time.

However, it also limits the later memory hotplug functionality.  Any DIMM
can't be hotplugged any more if its region is beyond the max_mem_size.  We
will get errors like:

[  216.387164] acpi PNP0C80:02: add_memory failed
[  216.389301] acpi PNP0C80:02: acpi_memory_enable_device() error
[  216.392187] acpi PNP0C80:02: Enumeration failure

This will cause issue in a known use case where 'mem=' is added to the
hypervisor.  The memory that lies after 'mem=' boundary will be assigned
to KVM guests.  After commit 357b4da5 merged, memory can't be extended
dynamically if system memory on hypervisor is not sufficient.

So fix it by also checking if it's during boot-time restricting to add
memory.  Otherwise, skip the restriction.

And also add this use case to document of 'mem=' kernel parameter.

Fixes: 357b4da5 ("x86: respect memory size limiting via mem= parameter")
Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: William Kucharski <william.kucharski@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Link: http://lkml.kernel.org/r/20200204050643.20925-1-bhe@redhat.com


Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent dccacf8d

Documentation/admin-guide/kernel-parameters.txt

+11 −2

Original line number	Diff line number	Diff line
		@@ -2573,13 +2573,22 @@
		For details see: Documentation/admin-guide/hw-vuln/mds.rst

		mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory
		Amount of memory to be used when the kernel is not able
		to see the whole system memory or for test.
		Amount of memory to be used in cases as follows:

		1 for test;
		2 when the kernel is not able to see the whole system memory;
		3 memory that lies after 'mem=' boundary is excluded from
		the hypervisor, then assigned to KVM guests.

		[X86] Work as limiting max address. Use together
		with memmap= to avoid physical address space collisions.
		Without memmap= PCI devices could be placed at addresses
		belonging to unused RAM.

		Note that this only takes effects during boot time since
		in above case 3, memory may need be hot added after boot
		if system memory of hypervisor is not sufficient.

		mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
		memory.

mm/memory_hotplug.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -105,7 +105,13 @@ static struct resource *register_memory_resource(u64 start, u64 size)
		unsigned long flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;
		char *resource_name = "System RAM";

		if (start + size > max_mem_size)
		/*
		* Make sure value parsed from 'mem=' only restricts memory adding
		* while booting, so that memory hotplug won't be impacted. Please
		* refer to document of 'mem=' in kernel-parameters.txt for more
		* details.
		*/
		if (start + size > max_mem_size && system_state < SYSTEM_RUNNING)
		return ERR_PTR(-E2BIG);

		/*

Admin message