net: remove broken net_set_boot_mask() boot device validation

There are many problems with net_set_boot_mask():

1) It is broken when using the device model instead of "-net nic". Example:
   $ qemu-system-x86_64 -device rtl8139,vlan=0,id=net0,mac=52:54:00:82:41:fd,bus=pci.0,addr=0x4 -net user,vlan=0,name=hostnet0 -vnc 0.0.0.0:0 -boot n
   Cannot boot from non-existent NIC
   $
2) The mask was previously used to set which boot ROMs were supposed to be
   loaded, but this was changed long time ago. Now all ROM images are loaded,
   and SeaBIOS takes care of jumping to the right boot entry point depending on
   the boot settings.
3) Interpretation and validation of the boot parameter letters is done on
   the machine type code. Examples: PC accepts only a,b,c,d,n as valid boot
   device letters. mac99 accepts only a,b,c,d,e,f.

As a side-effect of this change, qemu-kvm won't abort anymore if using "-boot n"
on a machine with no network devices. Checking if the requested boot device is
valid is now a task for the BIOS or the machine-type code.
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
Acked-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

net.c

@@ -1198,25 +1198,6 @@ void net_host_device_remove(Monitor *mon, const QDict *qdict)
     qemu_del_vlan_client(vc);
 }
 
-void net_set_boot_mask(int net_boot_mask)
-{
-    int i;
-
-    /* Only the first four NICs may be bootable */
-    net_boot_mask = net_boot_mask & 0xF;
-
-    for (i = 0; i < nb_nics; i++) {
-        if (net_boot_mask & (1 << i)) {
-            net_boot_mask &= ~(1 << i);
-        }
-    }
-
-    if (net_boot_mask) {
-        fprintf(stderr, "Cannot boot from non-existent NIC\n");
-        exit(1);
-    }
-}
-
 void do_info_network(Monitor *mon)
 {
     VLANState *vlan;

net.h

@@ -162,7 +162,6 @@ int net_client_parse(QemuOptsList *opts_list, const char *str);
 int net_init_clients(void);
 void net_check_clients(void);
 void net_cleanup(void);
-void net_set_boot_mask(int boot_mask);
 void net_host_device_add(Monitor *mon, const QDict *qdict);
 void net_host_device_remove(Monitor *mon, const QDict *qdict);
 

vl.c

@@ -2558,7 +2558,7 @@ int main(int argc, char **argv, char **envp)
     const char *gdbstub_dev = NULL;
     uint32_t boot_devices_bitmap = 0;
     int i;
-    int snapshot, linux_boot, net_boot;
+    int snapshot, linux_boot;
     const char *icount_option = NULL;
     const char *initrd_filename;
     const char *kernel_filename, *kernel_cmdline;
@@ -3565,9 +3565,6 @@ int main(int argc, char **argv, char **envp)
         exit(1);
     }
 
-    net_boot = (boot_devices_bitmap >> ('n' - 'a')) & 0xF;
-    net_set_boot_mask(net_boot);
-
     /* init the bluetooth world */
     if (foreach_device_config(DEV_BT, bt_parse))
         exit(1);