fuzz: refine the ide/ahci fuzzer configs

Disks work differently depending on the x86 machine type (SATA vs PATA).
Additionally, we should fuzz the atapi code paths, which might contain
vulnerabilities such as CVE-2020-29443. This patch adds hard-disk and
cdrom generic-fuzzer configs for both the pc (PATA) and q35 (SATA)
machine types.

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Acked-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-Id: <20210120152211.109782-1-alxndr@bu.edu>

tests/qtest/fuzz/generic_fuzz_configs.h

@@ -85,10 +85,28 @@ const generic_fuzz_config predefined_configs[] = {
         .objects = "intel-hda",
     },{
         .name = "ide-hd",
+        .args = "-machine pc -nodefaults "
+        "-drive file=null-co://,if=none,format=raw,id=disk0 "
+        "-device ide-hd,drive=disk0",
+        .objects = "*ide*",
+    },{
+        .name = "ide-atapi",
+        .args = "-machine pc -nodefaults "
+        "-drive file=null-co://,if=none,format=raw,id=disk0 "
+        "-device ide-cd,drive=disk0",
+        .objects = "*ide*",
+    },{
+        .name = "ahci-hd",
         .args = "-machine q35 -nodefaults "
         "-drive file=null-co://,if=none,format=raw,id=disk0 "
         "-device ide-hd,drive=disk0",
-        .objects = "ahci*",
+        .objects = "*ahci*",
+    },{
+        .name = "ahci-atapi",
+        .args = "-machine q35 -nodefaults "
+        "-drive file=null-co://,if=none,format=raw,id=disk0 "
+        "-device ide-cd,drive=disk0",
+        .objects = "*ahci*",
     },{
         .name = "floppy",
         .args = "-machine pc -nodefaults -device floppy,id=floppy0 "