Network boot for s390x. More information (and instructions

for building a s390-netboot.img) can be found at
 http://wiki.qemu-project.org/Features/S390xNetworkBoot
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Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20170228' into staging

Network boot for s390x. More information (and instructions
for building a s390-netboot.img) can be found at
http://wiki.qemu-project.org/Features/S390xNetworkBoot

# gpg: Signature made Tue 28 Feb 2017 11:27:18 GMT
# gpg:                using RSA key 0xDECF6B93C6F02FAF
# gpg: Good signature from "Cornelia Huck <huckc@linux.vnet.ibm.com>"
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>"
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20170228:
  pc-bios/s390-ccw.img: rebuild image
  pc-bios/s390-ccw: Use the ccw bios to start the network boot
  s390x/ipl: Load network boot image
  s390x/ipl: Extend S390IPLState to support network boot
  elf-loader: Allow late loading of elf

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/core/loader.c

@@ -434,6 +434,19 @@ int load_elf_as(const char *filename,
                 void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
                 uint64_t *highaddr, int big_endian, int elf_machine,
                 int clear_lsb, int data_swab, AddressSpace *as)
+{
+    return load_elf_ram(filename, translate_fn, translate_opaque,
+                        pentry, lowaddr, highaddr, big_endian, elf_machine,
+                        clear_lsb, data_swab, as, true);
+}
+
+/* return < 0 if error, otherwise the number of bytes loaded in memory */
+int load_elf_ram(const char *filename,
+                 uint64_t (*translate_fn)(void *, uint64_t),
+                 void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
+                 uint64_t *highaddr, int big_endian, int elf_machine,
+                 int clear_lsb, int data_swab, AddressSpace *as,
+                 bool load_rom)
 {
     int fd, data_order, target_data_order, must_swab, ret = ELF_LOAD_FAILED;
     uint8_t e_ident[EI_NIDENT];
@@ -473,11 +486,11 @@ int load_elf_as(const char *filename,
     if (e_ident[EI_CLASS] == ELFCLASS64) {
         ret = load_elf64(filename, fd, translate_fn, translate_opaque, must_swab,
                          pentry, lowaddr, highaddr, elf_machine, clear_lsb,
-                         data_swab, as);
+                         data_swab, as, load_rom);
     } else {
         ret = load_elf32(filename, fd, translate_fn, translate_opaque, must_swab,
                          pentry, lowaddr, highaddr, elf_machine, clear_lsb,
-                         data_swab, as);
+                         data_swab, as, load_rom);
     }
 
  fail:

hw/s390x/ipl.c

@@ -20,6 +20,7 @@
 #include "hw/s390x/virtio-ccw.h"
 #include "hw/s390x/css.h"
 #include "ipl.h"
+#include "qemu/error-report.h"
 
 #define KERN_IMAGE_START                0x010000UL
 #define KERN_PARM_AREA                  0x010480UL
@@ -209,6 +210,7 @@ static Property s390_ipl_properties[] = {
     DEFINE_PROP_STRING("initrd", S390IPLState, initrd),
     DEFINE_PROP_STRING("cmdline", S390IPLState, cmdline),
     DEFINE_PROP_STRING("firmware", S390IPLState, firmware),
+    DEFINE_PROP_STRING("netboot_fw", S390IPLState, netboot_fw),
     DEFINE_PROP_BOOL("enforce_bios", S390IPLState, enforce_bios, false),
     DEFINE_PROP_BOOL("iplbext_migration", S390IPLState, iplbext_migration,
                      true),
@@ -226,6 +228,12 @@ static bool s390_gen_initial_iplb(S390IPLState *ipl)
                 TYPE_VIRTIO_CCW_DEVICE);
         SCSIDevice *sd = (SCSIDevice *) object_dynamic_cast(OBJECT(dev_st),
                                                             TYPE_SCSI_DEVICE);
+        VirtIONet *vn = (VirtIONet *) object_dynamic_cast(OBJECT(dev_st),
+                                                          TYPE_VIRTIO_NET);
+
+        if (vn) {
+            ipl->netboot = true;
+        }
         if (virtio_ccw_dev) {
             CcwDevice *ccw_dev = CCW_DEVICE(virtio_ccw_dev);
 
@@ -258,12 +266,86 @@ static bool s390_gen_initial_iplb(S390IPLState *ipl)
     return false;
 }
 
+static int load_netboot_image(Error **errp)
+{
+    S390IPLState *ipl = get_ipl_device();
+    char *netboot_filename;
+    MemoryRegion *sysmem =  get_system_memory();
+    MemoryRegion *mr = NULL;
+    void *ram_ptr = NULL;
+    int img_size = -1;
+
+    mr = memory_region_find(sysmem, 0, 1).mr;
+    if (!mr) {
+        error_setg(errp, "Failed to find memory region at address 0");
+        return -1;
+    }
+
+    ram_ptr = memory_region_get_ram_ptr(mr);
+    if (!ram_ptr) {
+        error_setg(errp, "No RAM found");
+        goto unref_mr;
+    }
+
+    netboot_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, ipl->netboot_fw);
+    if (netboot_filename == NULL) {
+        error_setg(errp, "Could not find network bootloader");
+        goto unref_mr;
+    }
+
+    img_size = load_elf_ram(netboot_filename, NULL, NULL, &ipl->start_addr,
+                            NULL, NULL, 1, EM_S390, 0, 0, NULL, false);
+
+    if (img_size < 0) {
+        img_size = load_image_size(netboot_filename, ram_ptr, ram_size);
+        ipl->start_addr = KERN_IMAGE_START;
+    }
+
+    if (img_size < 0) {
+        error_setg(errp, "Failed to load network bootloader");
+    }
+
+    g_free(netboot_filename);
+
+unref_mr:
+    memory_region_unref(mr);
+    return img_size;
+}
+
+static bool is_virtio_net_device(IplParameterBlock *iplb)
+{
+    uint8_t cssid;
+    uint8_t ssid;
+    uint16_t devno;
+    uint16_t schid;
+    SubchDev *sch = NULL;
+
+    if (iplb->pbt != S390_IPL_TYPE_CCW) {
+        return false;
+    }
+
+    devno = be16_to_cpu(iplb->ccw.devno);
+    ssid = iplb->ccw.ssid & 3;
+
+    for (schid = 0; schid < MAX_SCHID; schid++) {
+        for (cssid = 0; cssid < MAX_CSSID; cssid++) {
+            sch = css_find_subch(1, cssid, ssid, schid);
+
+            if (sch && sch->devno == devno) {
+                return sch->id.cu_model == VIRTIO_ID_NET;
+            }
+        }
+    }
+    return false;
+}
+
 void s390_ipl_update_diag308(IplParameterBlock *iplb)
 {
     S390IPLState *ipl = get_ipl_device();
 
     ipl->iplb = *iplb;
     ipl->iplb_valid = true;
+    ipl->netboot = is_virtio_net_device(iplb);
 }
 
 IplParameterBlock *s390_ipl_get_iplb(void)
@@ -287,6 +369,7 @@ void s390_reipl_request(void)
 void s390_ipl_prepare_cpu(S390CPU *cpu)
 {
     S390IPLState *ipl = get_ipl_device();
+    Error *err = NULL;
 
     cpu->env.psw.addr = ipl->start_addr;
     cpu->env.psw.mask = IPL_PSW_MASK;
@@ -297,6 +380,13 @@ void s390_ipl_prepare_cpu(S390CPU *cpu)
             ipl->iplb_valid = s390_gen_initial_iplb(ipl);
         }
     }
+    if (ipl->netboot) {
+        if (load_netboot_image(&err) < 0) {
+            error_report_err(err);
+            vm_stop(RUN_STATE_INTERNAL_ERROR);
+        }
+        ipl->iplb.ccw.netboot_start_addr = ipl->start_addr;
+    }
 }
 
 static void s390_ipl_reset(DeviceState *dev)

hw/s390x/ipl.h

@@ -16,7 +16,8 @@
 #include "cpu.h"
 
 struct IplBlockCcw {
-    uint8_t  reserved0[85];
+    uint64_t netboot_start_addr;
+    uint8_t  reserved0[77];
     uint8_t  ssid;
     uint16_t devno;
     uint8_t  vm_flags;
@@ -100,12 +101,14 @@ struct S390IPLState {
     IplParameterBlock iplb;
     bool iplb_valid;
     bool reipl_requested;
+    bool netboot;
 
     /*< public >*/
     char *kernel;
     char *initrd;
     char *cmdline;
     char *firmware;
+    char *netboot_fw;
     uint8_t cssid;
     uint8_t ssid;
     uint16_t devno;

hw/s390x/s390-virtio-ccw.c

@@ -116,7 +116,8 @@ static void ccw_init(MachineState *machine)
     /* get a BUS */
     css_bus = virtual_css_bus_init();
     s390_init_ipl_dev(machine->kernel_filename, machine->kernel_cmdline,
-                      machine->initrd_filename, "s390-ccw.img", true);
+                      machine->initrd_filename, "s390-ccw.img",
+                      "s390-netboot.img", true);
     s390_flic_init();
 
     dev = qdev_create(NULL, TYPE_S390_PCI_HOST_BRIDGE);

hw/s390x/s390-virtio.c

@@ -65,6 +65,7 @@ void s390_init_ipl_dev(const char *kernel_filename,
                        const char *kernel_cmdline,
                        const char *initrd_filename,
                        const char *firmware,
+                       const char *netboot_fw,
                        bool enforce_bios)
 {
     Object *new = object_new(TYPE_S390_IPL);
@@ -78,6 +79,7 @@ void s390_init_ipl_dev(const char *kernel_filename,
     }
     qdev_prop_set_string(dev, "cmdline", kernel_cmdline);
     qdev_prop_set_string(dev, "firmware", firmware);
+    qdev_prop_set_string(dev, "netboot_fw", netboot_fw);
     qdev_prop_set_bit(dev, "enforce_bios", enforce_bios);
     object_property_add_child(qdev_get_machine(), TYPE_S390_IPL,
                               new, NULL);

hw/s390x/s390-virtio.h

@@ -24,6 +24,7 @@ void s390_init_ipl_dev(const char *kernel_filename,
                        const char *kernel_cmdline,
                        const char *initrd_filename,
                        const char *firmware,
+                       const char *netboot_fw,
                        bool enforce_bios);
 void s390_create_virtio_net(BusState *bus, const char *name);
 void s390_nmi(NMIState *n, int cpu_index, Error **errp);

include/hw/elf_ops.h

@@ -264,7 +264,7 @@ static int glue(load_elf, SZ)(const char *name, int fd,
                               int must_swab, uint64_t *pentry,
                               uint64_t *lowaddr, uint64_t *highaddr,
                               int elf_machine, int clear_lsb, int data_swab,
-                              AddressSpace *as)
+                              AddressSpace *as, bool load_rom)
 {
     struct elfhdr ehdr;
     struct elf_phdr *phdr = NULL, *ph;
@@ -403,10 +403,15 @@ static int glue(load_elf, SZ)(const char *name, int fd,
                 *pentry = ehdr.e_entry - ph->p_vaddr + ph->p_paddr;
             }
 
+            if (load_rom) {
                 snprintf(label, sizeof(label), "phdr #%d: %s", i, name);
 
                 /* rom_add_elf_program() seize the ownership of 'data' */
                 rom_add_elf_program(label, data, file_size, mem_size, addr, as);
+            } else {
+                cpu_physical_memory_write(addr, data, file_size);
+                g_free(data);
+            }
 
             total_size += mem_size;
             if (addr < low)

include/hw/loader.h

@@ -65,7 +65,7 @@ int load_image_gzipped(const char *filename, hwaddr addr, uint64_t max_sz);
 #define ELF_LOAD_WRONG_ENDIAN -4
 const char *load_elf_strerror(int error);
 
-/** load_elf_as:
+/** load_elf_ram:
  * @filename: Path of ELF file
  * @translate_fn: optional function to translate load addresses
  * @translate_opaque: opaque data passed to @translate_fn
@@ -81,6 +81,7 @@ const char *load_elf_strerror(int error);
  *             words and 3 for within doublewords.
  * @as: The AddressSpace to load the ELF to. The value of address_space_memory
  *      is used if nothing is supplied here.
+ * @load_rom : Load ELF binary as ROM
  *
  * Load an ELF file's contents to the emulated system's address space.
  * Clients may optionally specify a callback to perform address
@@ -93,6 +94,16 @@ const char *load_elf_strerror(int error);
  * If @elf_machine is EM_NONE then the machine type will be read from the
  * ELF header and no checks will be carried out against the machine type.
  */
+int load_elf_ram(const char *filename,
+                 uint64_t (*translate_fn)(void *, uint64_t),
+                 void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,
+                 uint64_t *highaddr, int big_endian, int elf_machine,
+                 int clear_lsb, int data_swab, AddressSpace *as,
+                 bool load_rom);
+
+/** load_elf_as:
+ * Same as load_elf_ram(), but always loads the elf as ROM
+ */
 int load_elf_as(const char *filename,
                 uint64_t (*translate_fn)(void *, uint64_t),
                 void *translate_opaque, uint64_t *pentry, uint64_t *lowaddr,

pc-bios/s390-ccw/bootmap.c

@@ -724,11 +724,17 @@ static void zipl_load_vscsi(void)
 
 void zipl_load(void)
 {
-    if (virtio_get_device()->is_cdrom) {
+    VDev *vdev = virtio_get_device();
+
+    if (vdev->is_cdrom) {
         ipl_iso_el_torito();
         panic("\n! Cannot IPL this ISO image !\n");
     }
 
+    if (virtio_get_device_type() == VIRTIO_ID_NET) {
+        jump_to_IPL_code(vdev->netboot_start_addr);
+    }
+
     ipl_scsi();
 
     switch (virtio_get_device_type()) {

pc-bios/s390-ccw/iplb.h

@@ -13,7 +13,8 @@
 #define IPLB_H
 
 struct IplBlockCcw {
-    uint8_t  reserved0[85];
+    uint64_t netboot_start_addr;
+    uint8_t  reserved0[77];
     uint8_t  ssid;
     uint16_t devno;
     uint8_t  vm_flags;

pc-bios/s390-ccw/main.c

@@ -53,6 +53,12 @@ static bool find_dev(Schib *schib, int dev_no)
         if (!virtio_is_supported(blk_schid)) {
             continue;
         }
+        /* Skip net devices since no IPLB is created and therefore no
+         * no network bootloader has been loaded
+         */
+        if (virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) {
+            continue;
+        }
         if ((dev_no < 0) || (schib->pmcw.dev == dev_no)) {
             return true;
         }
@@ -67,6 +73,7 @@ static void virtio_setup(void)
     int ssid;
     bool found = false;
     uint16_t dev_no;
+    VDev *vdev = virtio_get_device();
 
     /*
      * We unconditionally enable mss support. In every sane configuration,
@@ -85,9 +92,6 @@ static void virtio_setup(void)
             found = find_dev(&schib, dev_no);
             break;
         case S390_IPL_TYPE_QEMU_SCSI:
-        {
-            VDev *vdev = virtio_get_device();
-
             vdev->scsi_device_selected = true;
             vdev->selected_scsi_device.channel = iplb.scsi.channel;
             vdev->selected_scsi_device.target = iplb.scsi.target;
@@ -95,7 +99,6 @@ static void virtio_setup(void)
             blk_schid.ssid = iplb.scsi.ssid & 0x3;
             found = find_dev(&schib, iplb.scsi.devno);
             break;
-        }
         default:
             panic("List-directed IPL not supported yet!\n");
         }
@@ -111,10 +114,15 @@ static void virtio_setup(void)
 
     IPL_assert(found, "No virtio device found");
 
+    if (virtio_get_device_type() == VIRTIO_ID_NET) {
+        sclp_print("Network boot device detected\n");
+        vdev->netboot_start_addr = iplb.ccw.netboot_start_addr;
+    } else {
         virtio_setup_device(blk_schid);
 
         IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected");
     }
+}
 
 int main(void)
 {

pc-bios/s390-ccw/virtio.c

@@ -585,6 +585,7 @@ bool virtio_is_supported(SubChannelId schid)
         switch (vdev.senseid.cu_model) {
         case VIRTIO_ID_BLOCK:
         case VIRTIO_ID_SCSI:
+        case VIRTIO_ID_NET:
             return true;
         }
     }

pc-bios/s390-ccw/virtio.h

@@ -276,6 +276,7 @@ struct VDev {
     uint8_t scsi_dev_heads;
     bool scsi_device_selected;
     ScsiDevice selected_scsi_device;
+    uint64_t netboot_start_addr;
 };
 typedef struct VDev VDev;