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Date: Fri, 3 Oct 2025 22:37:10 -0400
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Vipin Sharma <vipinsh@...gle.com>
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Subject: Re: [PATCH v4 26/30] selftests/liveupdate: Add multi-kexec session
 lifecycle test

On Fri, Oct 3, 2025 at 10:07 PM Pasha Tatashin
<pasha.tatashin@...een.com> wrote:
>
> On Fri, Oct 3, 2025 at 6:51 PM Vipin Sharma <vipinsh@...gle.com> wrote:
> >
> > On 2025-09-29 01:03:17, Pasha Tatashin wrote:
> > > diff --git a/tools/testing/selftests/liveupdate/.gitignore b/tools/testing/selftests/liveupdate/.gitignore
> > > index af6e773cf98f..de7ca45d3892 100644
> > > --- a/tools/testing/selftests/liveupdate/.gitignore
> > > +++ b/tools/testing/selftests/liveupdate/.gitignore
> > > @@ -1 +1,2 @@
> > >  /liveupdate
> > > +/luo_multi_kexec
> >
> > In next patches new tests are not added to gitignore.
>
> Will fix it, thanks.
>
> >
> > > diff --git a/tools/testing/selftests/liveupdate/Makefile b/tools/testing/selftests/liveupdate/Makefile
> > > index 2a573c36016e..1cbc816ed5c5 100644
> > > --- a/tools/testing/selftests/liveupdate/Makefile
> > > +++ b/tools/testing/selftests/liveupdate/Makefile
> > > @@ -1,7 +1,38 @@
> > >  # SPDX-License-Identifier: GPL-2.0-only
> > > +
> > > +KHDR_INCLUDES ?= -I../../../usr/include
> >
> > If make is run from the tools/testing/selftests/liveupdate directory, this
> > will not work because it needs one more "..".
> >
> > If this is built using selftest Makefile from root directory
> >
> >   make -C tools/testing/selftests TARGETS=liveupdate
> >
> > there will not be build errors because tools/testing/selftests/Makefile
> > defines KHDR_INCLUDES, so above definition will never happen.
> >
> > >  CFLAGS += -Wall -O2 -Wno-unused-function
> > >  CFLAGS += $(KHDR_INCLUDES)
> > > +LDFLAGS += -static
> >
> > Why static? Can't we let user pass extra flags if they prefer static
>
> Because these tests are executed in a VM and not on the host, static
> makes sense to be able to run in a different environment.
>
> > > +
> > > +# --- Test Configuration (Edit this section when adding new tests) ---
> > > +LUO_SHARED_SRCS := luo_test_utils.c
> > > +LUO_SHARED_HDRS += luo_test_utils.h
> > > +
> > > +LUO_MANUAL_TESTS += luo_multi_kexec
> > > +
> > > +TEST_FILES += do_kexec.sh
> > >
> > >  TEST_GEN_PROGS += liveupdate
> > >
> > > +# --- Automatic Rule Generation (Do not edit below) ---
> > > +
> > > +TEST_GEN_PROGS_EXTENDED += $(LUO_MANUAL_TESTS)
> > > +
> > > +# Define the full list of sources for each manual test.
> > > +$(foreach test,$(LUO_MANUAL_TESTS), \
> > > +     $(eval $(test)_SOURCES := $(test).c $(LUO_SHARED_SRCS)))
> > > +
> > > +# This loop automatically generates an explicit build rule for each manual test.
> > > +# It includes dependencies on the shared headers and makes the output
> > > +# executable.
> > > +# Note the use of '$$' to escape automatic variables for the 'eval' command.
> > > +$(foreach test,$(LUO_MANUAL_TESTS), \
> > > +     $(eval $(OUTPUT)/$(test): $($(test)_SOURCES) $(LUO_SHARED_HDRS) \
> > > +             $(call msg,LINK,,$$@) ; \
> > > +             $(Q)$(LINK.c) $$^ $(LDLIBS) -o $$@ ; \
> > > +             $(Q)chmod +x $$@ \
> > > +     ) \
> > > +)
> > > +
> > >  include ../lib.mk
> >
> > make is not building LUO_MANUAL_TESTS, it is only building liveupdate.
> > How to build them?
>
> I am building them out of tree:
> make O=x86_64 -s -C tools/testing/selftests TARGETS=liveupdate install
> make O=x86_64 -s -C tools/testing/selftests TARGETS=kho install

Actually, I just tested in-tree and everything works for me, could you
please verify:

make mrproper  # Clean the tree
cat tools/testing/selftests/liveupdate/config > .config # Copy LUO depends.
make olddefconfig  # make a def config with LUO
make kvm_guest.config # Build minimal KVM guest with LUO
make headers # Make uAPI headers
make -C tools/testing/selftests TARGETS=liveupdate install # make and
install liveupdate selftests

# Show that self tests are properly installed:
ls -1 tools/testing/selftests/kselftest_install/liveupdate/
config
do_kexec.sh
liveupdate
luo_multi_file
luo_multi_kexec
luo_multi_session
luo_unreclaimed

Pasha

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