The patch titled
x86: add a bootparameter to reserve high linear address space
has been added to the -mm tree. Its filename is
x86-add-a-bootparameter-to-reserve-high-linear-address-space.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: x86: add a bootparameter to reserve high linear address space
From: Zachary Amsden <zach@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
Documentation/kernel-parameters.txt | 5 +++++
arch/i386/kernel/setup.c | 18 ++++++++++++++++++
2 files changed, 23 insertions(+)
diff -puN arch/i386/kernel/setup.c~x86-add-a-bootparameter-to-reserve-high-linear-address-space arch/i386/kernel/setup.c
--- a/arch/i386/kernel/setup.c~x86-add-a-bootparameter-to-reserve-high-linear-address-space
+++ a/arch/i386/kernel/setup.c
@@ -814,6 +814,24 @@ static int __init parse_vmalloc(char *ar
early_param("vmalloc", parse_vmalloc);
/*
+ * 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.
*/
static int __init
diff -puN Documentation/kernel-parameters.txt~x86-add-a-bootparameter-to-reserve-high-linear-address-space Documentation/kernel-parameters.txt
--- a/Documentation/kernel-parameters.txt~x86-add-a-bootparameter-to-reserve-high-linear-address-space
+++ a/Documentation/kernel-parameters.txt
@@ -1357,6 +1357,11 @@ running once the system is up.
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]
Specify the partition device for software suspend
_
Patches currently in -mm which might be from zach@xxxxxxxxxx are
x86-allow-a-kernel-to-not-be-in-ring-0.patch
x86-add-a-bootparameter-to-reserve-high-linear-address-space.patch
x86-trivial-pgtableh-__assembly__-move.patch
x86-trivial-move-of-__have-macros-in-i386-pagetable-headers.patch
x86-trivial-move-of-ptep_set_access_flags.patch
x86-remove-unused-include-from-efi_stubs.patch
-
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