qemu: Format HPT maxpagesize on the command line

This makes the feature fully functional.

https://bugzilla.redhat.com/show_bug.cgi?id=1571078Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

src/qemu/qemu_command.c

@@ -7277,6 +7277,18 @@ qemuBuildMachineCommandLine(virCommandPtr cmd,
 
             virBufferAsprintf(&buf, ",resize-hpt=%s", str);
         }
+
+        if (def->hpt_maxpagesize > 0) {
+            if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_MACHINE_PSERIES_CAP_HPT_MAX_PAGE_SIZE)) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("Configuring the page size for HPT guests "
+                                 "is not supported by this QEMU binary"));
+                goto cleanup;
+            }
+
+            virBufferAsprintf(&buf, ",cap-hpt-max-page-size=%lluk",
+                              def->hpt_maxpagesize);
+        }
     }
 
     if (cpu && cpu->model &&

tests/qemuxml2argvdata/pseries-features.args

@@ -7,7 +7,8 @@ QEMU_AUDIO_DRV=none \
 /usr/bin/qemu-system-ppc64 \
 -name guest \
 -S \
--machine pseries,accel=tcg,usb=off,dump-guest-core=off,resize-hpt=required \
+-machine pseries,accel=tcg,usb=off,dump-guest-core=off,resize-hpt=required,\
+cap-hpt-max-page-size=1048576k \
 -m 512 \
 -smp 1,sockets=1,cores=1,threads=1 \
 -uuid 1ccfd97d-5eb4-478a-bbe6-88d254c16db7 \