[PATCH V2] RISC-V: Add support for riscv kexec/kdump on kexec-tools

[Petr Tesařík]

On Mon, 27 Mar 2023 16:27:56 +0800
Guo Ren <guoren at kernel.org> wrote:

> F.Y.I
> 
> xianting_100 at 126.com
> 
> On Mon, Mar 27, 2023 at 9:52 AM Baoquan He <bhe at redhat.com> wrote:
> >
> > Hi Xianting,
> >
> > On 10/26/22 at 10:59am, Xianting Tian wrote:  
> > >
> > > 在 2022/10/26 上午10:13, Xianting Tian 写道:  
> > > > Hi Simon
> > > >
> > > > thanks for the comments
> > > >
> > > > 在 2022/10/21 下午11:27, Simon Horman 写道:  
> > > > > On Thu, Oct 20, 2022 at 11:15:48AM +0800, Xianting Tian wrote:  
> > > > > > From: Nick Kossifidis <mick at ics.forth.gr>
> > > > > >
> > > > > > This patch adds support for loading the ELF kernel image. It parses
> > > > > > the current/provided device tree to determine the system's memory
> > > > > > layout, and /proc/iomem for the various kernel segments.
> > > > > >
> > > > > > This patch was firstly developed by Nick Kossifidis, and two fixes (
> > > > > >     1: fail to find free memory area for dtb load when using
> > > > > > initrd image,
> > > > > > lists.infradead.org/pipermail/linux-riscv/2022-August/018398.html;
> > > > > >     2: fix memory range size calculation,
> > > > > >         kexec/arch/riscv/crashdump-riscv.c:line 85
> > > > > > ) are contributed by Yixun Lan, Xianting Tian.
> > > > > >
> > > > > > Tested on Qemu's rv64 virt machine and SoC of T-Head RISC-V
> > > > > > Xuantie 910 CPU.  
> > > > > Hi,
> > > > >
> > > > > thanks for some patch.
> > > > >
> > > > > Some minor feedback follows.
> > > > >
> > > > > Separately, I'll post a patch to add RISC-V builds to the github
> > > > > workflow. If you could include that in V3 I'd be most grateful.
> > > > >  
> > > > > > Tested-by: Yixun Lan <yixun.lan at gmail.com>
> > > > > > Co-developed-by: Xianting Tian <xianting.tian at linux.alibaba.com>
> > > > > > Co-developed-by: Yixun Lan <yixun.lan at gmail.com>
> > > > > > Signed-off-by: Nick Kossifidis <mick at ics.forth.gr>  
> > > > > ...
> > > > >  
> > > > > > +    ret = mem_regions_alloc_and_add(mem_ranges, start,
> > > > > > +                    end - start, type);  
> > > > > mem_regions_alloc_and_add isn't always available.
> > > > > f.e. on mips this causes a build failure.
> > > > >
> > > > > Ref: https://github.com/horms/kexec-tools/actions/runs/3298491143/jobs/5440677595  
> > > >
> > > > As you know, mem_regions_sort, mem_regions_alloc_and_add are the common
> > > > funtions,
> > > >
> > > > The build error of mips is caused by this riscv patch?
> > > >
> > > > kexec/mem_regions.c:void mem_regions_sort(struct memory_ranges *ranges)
> > > > kexec/mem_regions.h:void mem_regions_sort(struct memory_ranges *ranges);
> > > >
> > > >
> > > > kexec/mem_regions.c:int mem_regions_alloc_and_add(struct memory_ranges
> > > > *ranges,
> > > > kexec/mem_regions.h:int mem_regions_alloc_and_add(struct memory_ranges
> > > > *ranges,
> > > >  
> > > > >
> > > > > ...
> > > > >  
> > > > > > +int dtb_get_memory_ranges(char *dtb, struct memory_ranges
> > > > > > *mem_ranges, struct memory_ranges *extra_ranges)
> > > > > > +{  
> > > > > ...
> > > > >  
> > > > > > +    mem_regions_sort(mem_ranges);  
> > > > > Likewise, mem_regions_sort isn't always available.
> > > > > f.e. on mips this causes a build failure.
> > > > >
> > > > > ...
> > > > >  
> > > > > > diff --git a/purgatory/arch/riscv/Makefile
> > > > > > b/purgatory/arch/riscv/Makefile
> > > > > > new file mode 100644
> > > > > > index 0000000..8bded71
> > > > > > --- /dev/null
> > > > > > +++ b/purgatory/arch/riscv/Makefile
> > > > > > @@ -0,0 +1,7 @@
> > > > > > +#
> > > > > > +# Purgatory riscv
> > > > > > +#
> > > > > > +
> > > > > > +riscv_PURGATORY_SRCS =
> > > > > > +
> > > > > > +dist += purgatory/arch/sh/Makefile $(riscv_PURGATORY_SRCS)  
> > > > > s/sh/riscv/
> > > > >
> > > > > Else the distribution tarball won't include this Makefile
> > > > >
> > > > > You can exercise this using:
> > > > >    make distcheck DISTCHECK_CONFIGURE_FLAGS="--host=riscv64-linux-gnu"  
> > > > thanks, I will fix this.  
> > >
> > > the fix is in my personal gitee
> > >
> > > https://gitee.com/xianting-tian/kexec-tools/commits/master  
> >
> > Is this patchset reposting still in your working plan? I don't see the
> > code in kexe-tools, so ping to ask.
> >
> > If this is not your work tasks any more, people interested can pick this
> > patchset and post after polishing.

Now it seems I am interested. FYI my plan is to start working on this
if there is no further reaction from anybody else within a fortnight.

Petr T