[PATCH 2/3] tests/acpi: add a new unit test to test hotplug off/on feature on the root pci bus

[Ani Sinha <ani@anisinha.ca>]

Ability to turn hotplug off on the pci root bus for i440fx was added in commit:
3d7e78aa7777f0 ("Introduce a new flag for i440fx to disable PCI hotplug on the root bus")

This change adds a unit test in order to test this feature.

This change has been tested against upstream qemu master branch on top of tag v5.1.0.

Signed-off-by: Ani Sinha <ani@anisinha.ca>
---
 tests/qtest/bios-tables-test.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/qtest/bios-tables-test.c b/tests/qtest/bios-tables-test.c
index d49b3988ec..8f7d87c0f6 100644
--- a/tests/qtest/bios-tables-test.c
+++ b/tests/qtest/bios-tables-test.c
@@ -709,6 +709,19 @@ static void test_acpi_piix4_tcg_bridge(void)
     free_test_data(&data);
 }
 
+static void test_acpi_piix4_root_hotplug(void)
+{
+    test_data data;
+
+    memset(&data, 0, sizeof(data));
+    data.machine = MACHINE_PC;
+    data.variant = ".roothp";
+    data.required_struct_types = base_required_struct_types;
+    data.required_struct_types_len = ARRAY_SIZE(base_required_struct_types);
+    test_acpi_one("-global PIIX4_PM.acpi-root-pci-hotplug=off", &data);
+    free_test_data(&data);
+}
+
 static void test_acpi_q35_tcg(void)
 {
     test_data data;
@@ -1102,6 +1115,7 @@ int main(int argc, char *argv[])
         qtest_add_func("acpi/q35/tpm-tis", test_acpi_q35_tcg_tpm_tis);
         qtest_add_func("acpi/piix4", test_acpi_piix4_tcg);
         qtest_add_func("acpi/piix4/bridge", test_acpi_piix4_tcg_bridge);
+        qtest_add_func("acpi/piix4/hotplug", test_acpi_piix4_root_hotplug);
         qtest_add_func("acpi/q35", test_acpi_q35_tcg);
         qtest_add_func("acpi/q35/bridge", test_acpi_q35_tcg_bridge);
         qtest_add_func("acpi/q35/mmio64", test_acpi_q35_tcg_mmio64);
-- 
2.17.1