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[PATCH] x86: add a bootparameter to reserve high linear address space

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Add a boot parameter to reserve high linear address space for hypervisors.
This is necessary to allow dynamically loaded hypervisor modules, which might
not happen until userspace is already running, and also provides a useful tool
to benchmark the performance impact of reduced lowmem address space.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Zachary Amsden 2006-09-25 23:32:25 -07:00 committed by Linus Torvalds
parent 052e79941a
commit 461a9afff5
2 changed files with 23 additions and 0 deletions
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5
Documentation/kernel-parameters.txt
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@ -1363,6 +1363,11 @@ running once the system is up.
reserve= [KNL,BUGS] Force the kernel to ignore some iomem area reserve= [KNL,BUGS] Force the kernel to ignore some iomem area
reservetop= [IA-32]
Format: nn[KMG]
Reserves a hole at the top of the kernel virtual
address space.
resume= [SWSUSP] resume= [SWSUSP]
Specify the partition device for software suspend Specify the partition device for software suspend

18
arch/i386/kernel/setup.c
View file

@ -934,6 +934,24 @@ static void __init parse_cmdline_early (char ** cmdline_p)
} }
} }
/*
* reservetop=size reserves a hole at the top of the kernel address space which
* a hypervisor can load into later. Needed for dynamically loaded hypervisors,
* so relocating the fixmap can be done before paging initialization.
*/
static int __init parse_reservetop(char *arg)
{
unsigned long address;
if (!arg)
return -EINVAL;
address = memparse(arg, &arg);
reserve_top_address(address);
return 0;
}
early_param("reservetop", parse_reservetop);
/* /*
* Callback for efi_memory_walk. * Callback for efi_memory_walk.
*/ */