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@@ -0,0 +1,93 @@
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+import os
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+
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+import infra.basetest
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+
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+
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+class TestKexec(infra.basetest.BRTest):
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+
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+ # A specific configuration is needed for using kexec:
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+ # - We use Aarch64 since it is well supported for kexec,
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+ # - A kernel config fragment enables all the kexec parts,
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+ # - The kernel Image is installed on target filesystem to be
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+ # reloaded through kexec,
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+ # - We use a ext4 rootfs image exposed as a virtio storage (rather
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+ # than cpio initrd). This avoids needing to install the initrd
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+ # inside the rootfs.
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+ config = \
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+ """
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+ BR2_aarch64=y
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+ BR2_TOOLCHAIN_EXTERNAL=y
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+ BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
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+ BR2_LINUX_KERNEL=y
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+ BR2_LINUX_KERNEL_CUSTOM_VERSION=y
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+ BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.1.15"
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+ BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
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+ BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux.config"
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+ BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="{}"
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+ BR2_LINUX_KERNEL_INSTALL_TARGET=y
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+ BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
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+ BR2_PACKAGE_KEXEC=y
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+ BR2_TARGET_ROOTFS_EXT2=y
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+ BR2_TARGET_ROOTFS_EXT2_4=y
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+ # BR2_TARGET_ROOTFS_TAR is not set
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+ """.format(
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+ infra.filepath("tests/package/test_kexec/linux-kexec.fragment")
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+ )
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+
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+ def test_run(self):
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+ hda = os.path.join(self.builddir, "images", "rootfs.ext4")
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+ kern = os.path.join(self.builddir, "images", "Image")
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+ # Notes:
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+ # Sufficient memory is needed to load the kernel: having at
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+ # least 512MB works. kexec could silently fail if not enough
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+ # memory is present. KASLR needs to be disabled for the test:
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+ # we pass "nokaslr" to kernel bootargs, and also pass
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+ # "dtb-kaslr-seed=off" to qemu virt machine.
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+ bootargs = ["root=/dev/vda console=ttyAMA0 nokaslr"]
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+ qemu_opts = ["-M", "virt,dtb-kaslr-seed=off", "-cpu", "cortex-a57", "-m", "512M",
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+ "-drive", f"file={hda},if=virtio,format=raw"]
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+ self.emulator.boot(arch="aarch64",
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+ kernel=kern,
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+ kernel_cmdline=bootargs,
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+ options=qemu_opts)
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+ self.emulator.login()
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+
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+ # Test the program can execute
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+ self.assertRunOk("kexec --version")
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+
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+ # Check the kexec kernel is NOT loaded:
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+ self.assertRunOk("test \"$(cat /sys/kernel/kexec_loaded)\" -eq 0")
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+
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+ # Load the Kernel:
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+ # "--append br-test" adds a dummy kernel args we'll be able to
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+ # check in the second executed kernel.
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+ # We use the dtb image from /sys/firmware/fdt (since we don't
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+ # have the dtb file in the system)
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+ self.assertRunOk("kexec -d -l --dtb=/sys/firmware/fdt --reuse-cmdline --serial=ttyAMA0 --append=br-test /boot/Image")
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+
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+ # Check the kexec kernel IS loaded:
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+ self.assertRunOk("test \"$(cat /sys/kernel/kexec_loaded)\" -eq 1")
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+
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+ # Create a marker file in tmpfs which is supposed to disappear
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+ # after kexec kernel restart.
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+ self.assertRunOk("touch /dev/shm/br-kexec-marker")
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+
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+ # Execute the loaded kernel (i.e perform a kexec reboot)
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+ # qemu.sendline() is used here because no exit code nor
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+ # program return is expected, since kexec is like a
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+ # reboot. The login is expected to be reached after the
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+ # command is issued.
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+ self.emulator.qemu.sendline("kexec -d -e")
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+
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+ # Wait for the login, and log again
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+ self.emulator.login()
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+
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+ # Check the "br-test" dummy kernel arg is present
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+ self.assertRunOk("grep br-test /proc/cmdline")
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+
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+ # Check the test marker file is no longer here
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+ self.assertRunOk("test ! -e /dev/shm/br-kexec-marker")
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+
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+ # After restart, the kernel is not supposed to have a kexec
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+ # loaded image:
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+ self.assertRunOk("test \"$(cat /sys/kernel/kexec_loaded)\" -eq 0")
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Julien Olivain