dump: add panic test when reading pvpanic device capabilities

According to https://gitlab.com/qemu-project/qemu/-/blob/master/docs/
specs/pvpanic.rst, bit 0 means 'panic' and bit 1 means 'crash loaded'.
The section have two bits in "capability". 3(as '11') means both are
recognized in q35 machine type. 1(as '01') means compatibility in older
machine types.

ID: 1561
Signed-off-by: wji <wji@redhat.com>

qemu/tests/cfg/pvpanic_event_check.cfg

@@ -9,3 +9,4 @@
     check_kexec_cmd = "dmesg | grep crash_kexec_post_notifiers=1"
     expect_event = "GUEST_CRASHLOADED"
     trigger_crash_cmd = "echo c > /proc/sysrq-trigger"
+    check_ISA_cmd = "lspci -v | grep 'ISA bridge'"

qemu/tests/pvpanic_event_check.py

@@ -11,6 +11,8 @@ def run(test, params, env):
     1) boot up guest with pvpanic device
     2) setup crash_kexec_post_notifiers to 1 in VM and reboot VM
     3) check kdump server in guest
+       check the 'ISA bridge' device
+       check the capability file locations combined
     4) trigger a crash in guest
     5) check the event
 
@@ -29,6 +31,7 @@ def run(test, params, env):
     check_kexec_cmd = params["check_kexec_cmd"]
     expect_event = params["expect_event"]
     trigger_crash_cmd = params["trigger_crash_cmd"]
+    check_ISA_cmd = params["check_ISA_cmd"]
 
     error_context.context("Setup crash_kexec_post_notifiers=1 in guest",
                           test.log.info)
@@ -43,6 +46,18 @@ def run(test, params, env):
     if kdump_expect_status not in o:
         test.error("Kdump service status is not %s" % kdump_expect_status)
 
+    error_context.context("Check ISA Bridge in the guest", test.log.info)
+    o = session.cmd_output(check_ISA_cmd)
+    device_id = o.split()[0]
+    device_cmd = f"cat /sys/devices/pci0000:00/0000:{device_id}/QEMU0001:00/capability"
+    o = session.cmd_output(device_cmd)
+    if o.strip() == '1':
+        test.log.info("Got 1 since i440fx machine-type")
+    elif o.strip() == '3':
+        test.log.info("Got 3 since q35 machine-type")
+    else:
+        test.error("Please check the abnormal values")
+
     error_context.context("Trigger a crash in guest and check qmp event",
                           test.log.info)
     try: