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Message-ID: <20180309093346.GF25863@linaro.org>
Date: Fri, 9 Mar 2018 18:33:47 +0900
From: AKASHI Takahiro <takahiro.akashi@...aro.org>
To: Dave Young <dyoung@...hat.com>
Cc: vgoyal@...hat.com, bhe@...hat.com, mpe@...erman.id.au,
bauerman@...ux.vnet.ibm.com, prudo@...ux.vnet.ibm.com,
kexec@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
akpm@...ux-foundation.org
Subject: Re: [PATCH v2 0/7] kexec_file, x86, powerpc: refactoring for other
architecutres
Dave,
On Fri, Mar 09, 2018 at 03:55:47PM +0800, Dave Young wrote:
> On 03/09/18 at 03:46pm, Dave Young wrote:
> > Hi AKASHI,
> >
> > On 03/09/18 at 04:18pm, AKASHI Takahiro wrote:
> > > Dave,
> > >
> > > On Fri, Mar 09, 2018 at 02:44:12PM +0800, Dave Young wrote:
> > > > On 03/09/18 at 02:02pm, Dave Young wrote:
> > > > > On 03/08/18 at 09:05am, Dave Young wrote:
> > > > > > [Cc Andrew]
> > > > > >
> > > > > > On 03/06/18 at 07:22pm, AKASHI Takahiro wrote:
> > > > > > > This is a preparatory patch set for adding kexec_file support on arm64.
> > > > > > >
> > > > > > > It was originally included in a arm64 patch set[1], but Philipp is also
> > > > > > > working on their kexec_file support on s390[2] and some changes are now
> > > > > > > conflicting.
> > > > > > >
> > > > > > > So these common parts were extracted and put into a separate patch set for
> > > > > > > better integration. What's more, my original patch#4 was split into a few
> > > > > > > small chunks for easier review after Dave's comment.
> > > > > > >
> > > > > > > As such, the resulting code is basically identical with my original, and
> > > > > > > the only *visible* differences are:
> > > > > > > * renamings of _kexec_kernel_image_probe() and
> > > > > > > _kimage_file_post_load_cleanup()
> > > > > > > * change one of types of arguments at prepare_elf64_headers()
> > > > > > > Those, unfortunately, require a couple of trivial changes on the rest
> > > > > > > (#1, #6 to #13) of my arm64 kexec_file patch set[1].
> > > > > > >
> > > > > > > Patch#1 allows making a use of purgatory optional, particularly useful
> > > > > > > for arm64.
> > > > > > > Patch#2 commonalizes arch_kexec_kernel_{image_probe, image_load,
> > > > > > > verify_sig}() and arch_kimage_file_post_load_cleanup() across architectures.
> > > > > > > Patch#3-#7 is also intended to generalize parse_elf64_headers(), along with
> > > > > > > exclude_mem_range(), to be made best re-use of.
> > > > > > >
> > > > > > > [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2018-February/561182.html
> > > > > > > [2] http://lkml.iu.edu//hypermail/linux/kernel/1802.1/02596.html
> > > > > > >
> > > > > > >
> > > > > > > Changes in v2 (Mar 6, 2018)
> > > > > > > * use IS_ENABLED() instead of #ifdef's in kexec_calculate_store_digests()
> > > > > > > * rename _kexec_kernel_*() and make them static for now except for
> > > > > > > kexec_image_probe_default() which is actually used by arch(powerpc) code
> > > > > > > (Note: kexec_image_post_load_cleanup_default() will also be exported by
> > > > > > > arm64 patches.)
> > > > > > > * change a type of kernel_map in prepare_elf64_headers() to "int"
> > > > > > > * check for a total number of system ram regions in full_up_crash_elf_data()
> > > > > > > and use vzalloc() instead of vmalloc()
> > > > > > >
> > > > > > > AKASHI Takahiro (7):
> > > > > > > kexec_file: make an use of purgatory optional
> > > > > > > kexec_file,x86,powerpc: factor out kexec_file_ops functions
> > > > > > > x86: kexec_file: purge system-ram walking from prepare_elf64_headers()
> > > > > > > x86: kexec_file: remove X86_64 dependency from prepare_elf64_headers()
> > > > > > > x86: kexec_file: lift CRASH_MAX_RANGES limit on crash_mem buffer
> > > > > > > x86: kexec_file: clean up prepare_elf64_headers()
> > > > > > > kexec_file, x86: move re-factored code to generic side
> > > > > > >
> > > > > > > arch/powerpc/Kconfig | 3 +
> > > > > > > arch/powerpc/include/asm/kexec.h | 2 +-
> > > > > > > arch/powerpc/kernel/kexec_elf_64.c | 2 +-
> > > > > > > arch/powerpc/kernel/machine_kexec_file_64.c | 39 +---
> > > > > > > arch/x86/Kconfig | 3 +
> > > > > > > arch/x86/include/asm/kexec-bzimage64.h | 2 +-
> > > > > > > arch/x86/kernel/crash.c | 334 ++++++----------------------
> > > > > > > arch/x86/kernel/kexec-bzimage64.c | 2 +-
> > > > > > > arch/x86/kernel/machine_kexec_64.c | 45 +---
> > > > > > > include/linux/kexec.h | 32 ++-
> > > > > > > kernel/kexec_file.c | 240 +++++++++++++++++++-
> > > > > > > 11 files changed, 338 insertions(+), 366 deletions(-)
> > > > > > >
> > > > > > > --
> > > > > > > 2.16.2
> > > > > > >
> > > > > >
> > > > > > AKASHI, thanks for another update, looks good to me:
> > > > > >
> > > > > > Acked-by: Dave Young <dyoung@...hat.com>
> > > > >
> > > > > Hold on the ack, during today's tests kexec kernel can not boot, it
> > > > > hangs early. Will see if it is caused by this series and come back
> > > > > later.
> > > >
> > > > AKASHI, it seems the first patch causes the hang, can you take a look?
> > >
> > > Sure, but can you first tell me specifics about what you have observed?
> >
> > It is a kexec load test like below:
> > kexec -s -l /boot/vmlinuz-`uname -r` --reuse-cmdline
> > sync
> > sync
> > kexec -e
> >
> > And it hangs after the message "Starting new kernel". Now I'm not sure
> > how I tested the vmcore parsing before, maybe I forgot to add "-s"
> > option in kexec-tools..
>
> BTW kdump kernel also failed to boot.
> I use linus tree, the git HEAD is
> 86f84779d8e9 (origin/master, origin/HEAD, master) Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
>
> It is a little odd for my testing, for kdump testing I did before, I do
> not need add "-s" explictly since Fedora will take it automatically in
> case Secure Boot and I always enabled Secure Boot.
Oops, please apply the fix below to my first patch ("kexec_file: make
an use of purgatory optional"). My screw-up is trivial here :)
Please let me know if you think that I should repost my patch set.
Thanks,
-Takahiro AKASHI
===8<===
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 6dbbb89cbbac..ab1dced677fd 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -532,7 +532,7 @@ static int kexec_calculate_store_digests(struct kimage *image)
struct kexec_sha_region *sha_regions;
struct purgatory_info *pi = &image->purgatory_info;
- if (!IS_ENABLED(ARCH_HAS_KEXEC_PURGATORY))
+ if (!IS_ENABLED(CONFIG_ARCH_HAS_KEXEC_PURGATORY))
return 0;
zero_buf = __va(page_to_pfn(ZERO_PAGE(0)) << PAGE_SHIFT);
===>8===
> >
> > Thanks
> > Dave
> >
> > >
> > > Thanks,
> > > -Takahiro AKASHI
> > >
> > >
> > > > >
> > > > > >
> > > > > > Thanks
> > > > > > Dave
> > > > >
> > > > > Thanks
> > > > > Dave
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