Fix a gap where acpi_pcihp_find_hotplug_bus() returns a non-hotpluggable bus

When ACPI hotplug for the root bus is disabled, the bsel property for that
bus is not set. Please see the following commit:

3d7e78aa77 ("Introduce a new flag for i440fx to disable PCI hotplug on the
root bus").

As a result, when acpi_pcihp_find_hotplug_bus() is called
with bsel set to 0, it may return the root bus. This can cause devices
attached to the root bus to get hot-unplugged if the user issues the following
set of commmands:

outl 0xae10 0
outl 0xae08 your_slot

Thanks to Julia for pointing this out here:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg734548.html

In this patch, we fix the issue in this function by checking if the bus which
is returned by the function is actually hotpluggable. If not, we simply return
NULL. This avoids the scenario where we were returning a non-hotpluggable bus.

Signed-off-by: Ani Sinha <ani@anisinha.ca>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20200918084111.15339-5-ani@anisinha.ca>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/acpi/pcihp.c

@@ -147,6 +147,21 @@ static PCIBus *acpi_pcihp_find_hotplug_bus(AcpiPciHpState *s, int bsel)
     if (!bsel && !find.bus) {
         find.bus = s->root;
     }
+
+    /*
+     * Check if find.bus is actually hotpluggable. If bsel is set to
+     * NULL for example on the root bus in order to make it
+     * non-hotpluggable, find.bus will match the root bus when bsel
+     * is 0. See acpi_pcihp_test_hotplug_bus() above. Since the
+     * bus is not hotpluggable however, we should not select the bus.
+     * Instead, we should set find.bus to NULL in that case. In the check
+     * below, we generalize this case for all buses, not just the root bus.
+     * The callers of this function check for a null return value and
+     * handle them appropriately.
+     */
+    if (find.bus && !qbus_is_hotpluggable(BUS(find.bus))) {
+        find.bus = NULL;
+    }
     return find.bus;
 }