i386: enable rust hpet for pc when rust is enabled

Add HPET configuration in PC's Kconfig options, and select HPET device
(Rust version) if Rust is supported.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-11-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configs/devices/i386-softmmu/default.mak

@@ -6,6 +6,7 @@
 #CONFIG_APPLESMC=n
 #CONFIG_FDC=n
 #CONFIG_HPET=n
+#CONFIG_X_HPET_RUST=n
 #CONFIG_HYPERV=n
 #CONFIG_ISA_DEBUG=n
 #CONFIG_ISA_IPMI_BT=n

hw/i386/pc.c

@@ -1701,7 +1701,7 @@ static void pc_machine_initfn(Object *obj)
     pcms->sata_enabled = true;
     pcms->i8042_enabled = true;
     pcms->max_fw_size = 8 * MiB;
-#ifdef CONFIG_HPET
+#if defined(CONFIG_HPET) || defined(CONFIG_X_HPET_RUST)
     pcms->hpet_enabled = true;
 #endif
     pcms->fd_bootchk = true;

hw/timer/Kconfig

@@ -11,7 +11,7 @@ config A9_GTIMER
 
 config HPET
     bool
-    default y if PC
+    default y if PC && !HAVE_RUST
 
 config I8254
     bool

rust/hw/Kconfig

@@ -1,2 +1,3 @@
 # devices Kconfig
 source char/Kconfig
+source timer/Kconfig

rust/hw/timer/Kconfig

@@ -0,0 +1,2 @@
+config X_HPET_RUST
+    bool

tests/qtest/meson.build

@@ -103,7 +103,8 @@ qtests_i386 = \
    config_all_devices.has_key('CONFIG_VIRTIO_PCI') and                                      \
    slirp.found() ? ['virtio-net-failover'] : []) +                                          \
   (unpack_edk2_blobs and                                                                    \
-   config_all_devices.has_key('CONFIG_HPET') and                                            \
+   (config_all_devices.has_key('CONFIG_HPET') or                                            \
+    config_all_devices.has_key('CONFIG_X_HPET_RUST')) and                                   \
    config_all_devices.has_key('CONFIG_PARALLEL') ? ['bios-tables-test'] : []) +             \
   qtests_pci +                                                                              \
   qtests_cxl +                                                                              \