[PATCH 3/4] selftests: kho: Add riscv support

[Chen Pei]

Teach the KHO vmtest runner about riscv64: map the target to ARCH
riscv and describe the QEMU virt machine, the kernel image and its
console -- a 16550A port probed from the device tree on virt, hence
the SERIAL_8250{,_CONSOLE} and SERIAL_OF_PLATFORM symbols.  Also
select CONFIG_SPARSEMEM_MANUAL: the runner requires
CONFIG_DEFERRED_STRUCT_PAGE_INIT, which depends on SPARSEMEM, while
riscv falls back to FLATMEM (no ARCH_SPARSEMEM_DEFAULT), so without
it the test would just be skipped.

Signed-off-by: Chen Pei <cp0613 at linux.alibaba.com>
---
Test: qemu-system-riscv64 (virt, -cpu max, TCG), in-tree runner
"tools/testing/selftests/kho/vmtest.sh -t riscv64" (boots the Image
and kexec'es into the same Image).

  KHO: found kexec handover data.
  KHO: exec from: 7.3.0-rc7-00108-gc6e90ee4ccbb (count 1)
  test_kho: KHO restore succeeded
  ok 1 KHO succeeded
  # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0

 tools/testing/selftests/kho/riscv.conf | 9 +++++++++
 tools/testing/selftests/kho/vmtest.sh  | 3 ++-
 2 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/kho/riscv.conf

diff --git a/tools/testing/selftests/kho/riscv.conf b/tools/testing/selftests/kho/riscv.conf
new file mode 100644
index 000000000000..ec2a46cd45d5
--- /dev/null
+++ b/tools/testing/selftests/kho/riscv.conf
@@ -0,0 +1,9 @@
+QEMU_CMD="qemu-system-riscv64 -M virt -cpu max"
+QEMU_KCONFIG="
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_OF_PLATFORM=y
+CONFIG_SPARSEMEM_MANUAL=y
+"
+KERNEL_IMAGE="Image"
+KERNEL_CMDLINE="console=ttyS0"
diff --git a/tools/testing/selftests/kho/vmtest.sh b/tools/testing/selftests/kho/vmtest.sh
index 0014bd76e88d..325af59f653a 100755
--- a/tools/testing/selftests/kho/vmtest.sh
+++ b/tools/testing/selftests/kho/vmtest.sh
@@ -21,7 +21,7 @@ Options:
 	-d)	path to the kernel build directory
 	-j)	number of jobs for compilation, similar to -j in make
 	-t)	run test for target_arch, requires CROSS_COMPILE set
-		supported targets: aarch64, x86_64
+		supported targets: aarch64, x86_64, riscv64
 	-h)	display this help
 EOF
 }
@@ -127,6 +127,7 @@ function target_to_arch() {
 	case $target in
 	     aarch64) echo "arm64" ;;
 	     x86_64) echo "x86" ;;
+	     riscv64) echo "riscv" ;;
 	     *) skip "architecture $target is not supported"
 	esac
 }
-- 
2.50.1