reserve_crashkernel_cma() reserves CMA ranges for the
crash kernel. If allocating the requested size fails,
try to reserve in smaller blocks.
Store the reserved ranges in the crashk_cma_ranges array
and the number of ranges in crashk_cma_cnt.
Signed-off-by: Jiri Bohac
---
include/linux/crash_re
Add a new cma_size parameter to parse_crashkernel().
When not NULL, call __parse_crashkernel to parse the CMA
reservation size from "crashkernel=size,cma" and store it
in cma_size.
Set cma_size to NULL in all calls to parse_crashkernel().
Signed-off-by: Jiri Bohac
---
arch/arm/kernel/setup.c
Implement the crashkernel CMA reservation for x86:
- enable parsing of the cma suffix by parse_crashkernel()
- reserve memory with reserve_crashkernel_cma()
- add the CMA-reserved ranges to the e820 map for the crash kernel
- exclude the CMA-reserved ranges from vmcore
Signed-off-by: Jiri Bohac
-
When re-using the CMA area for kdump there is a risk of pending DMA into
pinned user pages in the CMA area.
Pages that are pinned long-term are migrated away from CMA, so these are
not a concern. Pages pinned without FOLL_LONGTERM remain in the CMA and may
possibly be the source or destination of
Describe the new crashkernel ",cma" suffix in Documentation/
Signed-off-by: Jiri Bohac
---
Documentation/admin-guide/kdump/kdump.rst | 24 +--
.../admin-guide/kernel-parameters.txt | 22 +
2 files changed, 44 insertions(+), 2 deletions(-)
diff --git a
Hi,
this series implements a way to reserve additional crash kernel
memory using CMA.
Link to the v1 discussion:
https://lore.kernel.org/lkml/zwd_fapqewkfl...@dwarf.suse.cz/
See below for the changes since v1 and how concerns from the
discussion have been addressed.
Currently, all the memory fo
On 3/4/25 11:16, Dave Hansen wrote:
> On 3/4/25 10:49, Eric W. Biederman wrote:
>> How goes the work to fix this horrifically slow firmware interface?
> The firmware interface isn't actually all that slow.
Hey Eric,
I've noticed a trend on this series. It seems like every time there's
some forwar
From: David Woodhouse
If a serial port was configured for early_printk, use it for debug output
from the relocate_kernel exception handler too.
Signed-off-by: David Woodhouse
---
arch/x86/include/asm/kexec.h | 1 +
arch/x86/kernel/early_printk.c | 6 +
arch/x86/kernel/reloc
From: David Woodhouse
A previous commit added __nocfi to machine_kexec() because it makes an
indirect call to relocate_kernel() which lacked CFI type information,
and caused the system to crash.
Use SYM_TYPED_FUNC_START() to ensure that the type information is
present, and remove the __nocfi tag
From: David Woodhouse
There are some failure modes which lead to triple-faults in the
relocate_kernel function, which is fairly much undebuggable for normal
mortals.
Adding a GDT in the relocate_kernel environment is step 1 towards being
able to catch faults and do something more useful.
Signed
Debugging kexec failures is painful, as anything going wrong in execution
of the critical relocate_kernel() function tends to just lead to a triple
fault. Thus leading to *weeks* of my life that I won't get back. Having
hacked something up for my own use, I figured I should share it...
Add a trivi
From: David Woodhouse
The actual serial output function is a no-op for now.
Signed-off-by: David Woodhouse
---
arch/x86/kernel/relocate_kernel_64.S | 101 ++-
1 file changed, 98 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/relocate_kernel_64.S
b/arch/x86
From: David Woodhouse
Commit 2114796ca041 ("x86/kexec: Mark machine_kexec() with __nocfi") marked
the machine_kexec() function with __nocfi because I failed to make objtool
happy when actually *providing* CFI information for the relocate_kernel()
function that it calls, and __nocfi was the easy w
From: David Woodhouse
Signed-off-by: David Woodhouse
---
arch/x86/kernel/relocate_kernel_64.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/relocate_kernel_64.S
b/arch/x86/kernel/relocate_kernel_64.S
index 17d41e6e1a4b..2b7fc59af373 100644
--- a/arch/x86/k
On Mon, Mar 03, 2025 at 09:25:30AM +0100, David Hildenbrand wrote:
> On 20.02.25 17:48, Jiri Bohac wrote:
> >
> > By reserving additional crashkernel memory from CMA, the main
> > crashkernel reservation can be just large enough to fit the
> > kernel and initrd image, minimizing the memory taken a
From: David Woodhouse
This supports the same 32-bit MMIO-mapped 8250 as the early_printk code.
It's not clear why the early_printk code supports this form and only this
form; the actual runtime 8250_pci doesn't seem to support it. But having
hacked up QEMU to expose such a device, early_printk d
From: David Woodhouse
Signed-off-by: David Woodhouse
---
arch/x86/include/asm/kexec.h | 5 ++
arch/x86/kernel/machine_kexec_64.c | 21
arch/x86/kernel/relocate_kernel_64.S | 74
3 files changed, 100 insertions(+)
diff --git a/arch/x86/include/as
nux/kernel/git/zohar/linux-integrity.git
next-integrity
patch link:
https://lore.kernel.org/r/20250304190351.96975-5-chenste%40linux.microsoft.com
patch subject: [PATCH v9 4/7] ima: kexec: define functions to copy IMA log at
soft boot
config: powerpc64-randconfig-r133-20250312
(https://downl
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