Re: [Qemu-devel] [PATCH] Port codes from qemu-kvm to support boot from SCSI image

[haishan <haishan.bai@gmail.com>]

malc wrote:
> On Tue, 17 Aug 2010, Haishan Bai wrote:
>
>   
>> Port codes from qemu-kvm to support boot from SCSI image
>>
>> Signed-off-by: Shan Hai <haishan.bai@gmail.com>
>> ---
>>  Makefile.target |    1 +
>>  blockdev.c      |   13 ++++++
>>  blockdev.h      |    2 +
>>  hw/extboot.c    |  123
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>  hw/ivshmem.c    |    2 +-
>>  hw/pc.c         |   17 ++++++++
>>  hw/pc.h         |    4 ++
>>  qemu-config.c   |    4 ++
>>  8 files changed, 165 insertions(+), 1 deletions(-)
>>  create mode 100644 hw/extboot.c
>>
>> diff --git a/Makefile.target b/Makefile.target
>> index c8281e9..abba79c 100644
>> --- a/Makefile.target
>> +++ b/Makefile.target
>> @@ -199,6 +199,7 @@ obj-i386-y += mc146818rtc.o i8259.o pc.o
>>  obj-i386-y += cirrus_vga.o apic.o ioapic.o piix_pci.o
>>  obj-i386-y += vmmouse.o vmport.o hpet.o applesmc.o
>>  obj-i386-y += device-hotplug.o pci-hotplug.o smbios.o wdt_ib700.o
>> +obj-i386-y += extboot.o
>>  obj-i386-y += debugcon.o multiboot.o
>>  obj-i386-y += pc_piix.o
>>
>> diff --git a/blockdev.c b/blockdev.c
>> index 01e402b..78c286c 100644
>> --- a/blockdev.c
>> +++ b/blockdev.c
>> @@ -15,6 +15,8 @@
>>  #include "qemu-config.h"
>>  #include "sysemu.h"
>>
>> +DriveInfo *extboot_drive = NULL;
>> +
>>  static QTAILQ_HEAD(drivelist, DriveInfo) drives =
>> QTAILQ_HEAD_INITIALIZER(drives);
>>
>>  /*
>> @@ -150,6 +152,7 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi,
>> int *fatal_error)
>>      int on_read_error, on_write_error;
>>      const char *devaddr;
>>      DriveInfo *dinfo;
>> +    int is_extboot = 0;
>>      int snapshot = 0;
>>      int ret;
>>
>> @@ -311,6 +314,12 @@ DriveInfo *drive_init(QemuOpts *opts, int
>> default_to_scsi, int *fatal_error)
>>          }
>>      }
>>
>> +    is_extboot = qemu_opt_get_bool(opts, "boot", 0);
>> +    if (is_extboot && extboot_drive) {
>> +        fprintf(stderr, "qemu: two bootable drives specified\n");
>> +        return NULL;
>> +    }
>> +
>>      on_write_error = BLOCK_ERR_STOP_ENOSPC;
>>      if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
>>          if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type !=
>> IF_NONE) {
>> @@ -421,6 +430,10 @@ DriveInfo *drive_init(QemuOpts *opts, int
>> default_to_scsi, int *fatal_error)
>>          strncpy(dinfo->serial, serial, sizeof(dinfo->serial) - 1);
>>      QTAILQ_INSERT_TAIL(&drives, dinfo, next);
>>
>> +    if (is_extboot) {
>> +        extboot_drive = dinfo;
>> +    }
>> +
>>      bdrv_set_on_error(dinfo->bdrv, on_read_error, on_write_error);
>>
>>      switch(type) {
>> diff --git a/blockdev.h b/blockdev.h
>> index 37f3a01..e707b87 100644
>> --- a/blockdev.h
>> +++ b/blockdev.h
>> @@ -59,4 +59,6 @@ int do_block_set_passwd(Monitor *mon, const QDict *qdict,
>> QObject **ret_data);
>>  int do_change_block(Monitor *mon, const char *device,
>>                      const char *filename, const char *fmt);
>>
>> +extern DriveInfo *extboot_drive;
>> +
>>  #endif
>> diff --git a/hw/extboot.c b/hw/extboot.c
>> new file mode 100644
>> index 0000000..8ada21b
>> --- /dev/null
>> +++ b/hw/extboot.c
>> @@ -0,0 +1,123 @@
>> +/*
>> + * Extended boot option ROM support.
>> + *
>> + * Copyright IBM, Corp. 2007
>> + *
>> + * Authors:
>> + *  Anthony Liguori <aliguori@us.ibm.com>
>> + *
>> + * This work is licensed under the terms of the GNU GPL, version 2.  See
>> + * the COPYING file in the top-level directory.
>> + *
>> + */
>> +
>> +#include "hw.h"
>> +#include "pc.h"
>> +#include "isa.h"
>> +#include "block.h"
>> +
>> +/* Extended Boot ROM suport */
>> +
>> +union extboot_cmd
>> +{
>> +    uint16_t type;
>> +    struct {
>> +    uint16_t type;
>> +    uint16_t cylinders;
>> +    uint16_t heads;
>> +    uint16_t sectors;
>> +    uint64_t nb_sectors;
>> +    } query_geometry;
>> +    struct {
>> +    uint16_t type;
>> +    uint16_t nb_sectors;
>> +    uint16_t segment;
>> +    uint16_t offset;
>> +    uint64_t sector;
>> +    } xfer;
>> +};
>>     
>
> What's with the indentation here?
>
>   
>> +
>> +static void get_translated_chs(BlockDriverState *bs, int *c, int *h, int *s)
>> +{
>> +    bdrv_get_geometry_hint(bs, c, h, s);
>> +
>> +    if (*c <= 1024) {
>> +    *c >>= 0;
>> +    *h <<= 0;
>> +    } else if (*c <= 2048) {
>> +    *c >>= 1;
>> +    *h <<= 1;
>> +    } else if (*c <= 4096) {
>> +    *c >>= 2;
>> +    *h <<= 2;
>> +    } else if (*c <= 8192) {
>> +    *c >>= 3;
>> +    *h <<= 3;
>> +    } else {
>> +    *c >>= 4;
>> +    *h <<= 4;
>> +    }
>> +
>> +    /* what is the correct algorithm for this?? */
>> +    if (*h == 256) {
>> +    *h = 255;
>> +    *c = *c + 1;
>> +    }
>> +}
>>     
>
> And here.
>
>   
>> +
>> +static void extboot_write_cmd(void *opaque, uint32_t addr, uint32_t value)
>> +{
>> +    union extboot_cmd cmd;
>> +    BlockDriverState *bs = opaque;
>> +    int cylinders, heads, sectors, err;
>> +    uint64_t nb_sectors;
>> +    target_phys_addr_t pa = 0;
>> +    int blen = 0;
>> +    void *buf = NULL;
>> +
>> +    cpu_physical_memory_read((value & 0xFFFF) << 4, (uint8_t *)&cmd,
>> +                             sizeof(cmd));
>> +
>> +    if (cmd.type == 0x01 || cmd.type == 0x02) {
>> +    pa = cmd.xfer.segment * 16 + cmd.xfer.offset;
>> +        blen = cmd.xfer.nb_sectors * 512;
>> +        buf = qemu_memalign(512, blen);
>> +    }
>>     
>
> And here.
>
>   
>> +
>> +    switch (cmd.type) {
>> +    case 0x00:
>> +        get_translated_chs(bs, &cylinders, &heads, &sectors);
>> +    bdrv_get_geometry(bs, &nb_sectors);
>> +    cmd.query_geometry.cylinders = cylinders;
>> +    cmd.query_geometry.heads = heads;
>> +    cmd.query_geometry.sectors = sectors;
>> +    cmd.query_geometry.nb_sectors = nb_sectors;
>> +    break;
>> +    case 0x01:
>> +    err = bdrv_read(bs, cmd.xfer.sector, buf, cmd.xfer.nb_sectors);
>> +    if (err)
>> +        printf("Read failed\n");
>> +
>> +        cpu_physical_memory_write(pa, buf, blen);
>> +
>> +    break;
>> +    case 0x02:
>> +        cpu_physical_memory_read(pa, buf, blen);
>> +
>> +    err = bdrv_write(bs, cmd.xfer.sector, buf, cmd.xfer.nb_sectors);
>> +    if (err)
>> +        printf("Write failed\n");
>> +
>> +    break;
>> +    }
>>     
>
> And here.
>
>   
>> +
>> +    cpu_physical_memory_write((value & 0xFFFF) << 4, (uint8_t *)&cmd,
>> +                              sizeof(cmd));
>> +    if (buf)
>> +        qemu_free(buf);
>> +}
>> +
>> +void extboot_init(BlockDriverState *bs)
>> +{
>> +    register_ioport_write(0x405, 1, 2, extboot_write_cmd, bs);
>> +}
>> diff --git a/hw/ivshmem.c b/hw/ivshmem.c
>> index bbb5cba..e38ac2a 100644
>> --- a/hw/ivshmem.c
>> +++ b/hw/ivshmem.c
>> @@ -353,7 +353,7 @@ static int check_shm_size(IVShmemState *s, int fd) {
>>      if (s->ivshmem_size > buf.st_size) {
>>          fprintf(stderr, "IVSHMEM ERROR: Requested memory size greater");
>>          fprintf(stderr, " than shared object size (%" PRIu64 " > %ld)\n",
>> -                                          s->ivshmem_size, buf.st_size);
>> +                s->ivshmem_size, (long int)buf.st_size);
>>          return -1;
>>      } else {
>>          return 0;
>> diff --git a/hw/pc.c b/hw/pc.c
>> index 58dea57..88f43aa 100644
>> --- a/hw/pc.c
>> +++ b/hw/pc.c
>> @@ -54,6 +54,7 @@
>>  #endif
>>
>>  #define BIOS_FILENAME "bios.bin"
>> +#define EXTBOOT_FILENAME "extboot.bin"
>>
>>  #define PC_MAX_BIOS_SIZE (4 * 1024 * 1024)
>>
>> @@ -953,6 +954,10 @@ void pc_memory_init(ram_addr_t ram_size,
>>                                   isa_bios_size,
>>                                   (bios_offset + bios_size - isa_bios_size) |
>> IO_MEM_ROM);
>>
>> +    if (extboot_drive) {
>> +        option_rom[nb_option_roms++] = qemu_strdup(EXTBOOT_FILENAME);
>> +    }
>> +
>>      option_rom_offset = qemu_ram_alloc(NULL, "pc.rom", PC_ROM_SIZE);
>>      cpu_register_physical_memory(PC_ROM_MIN_VGA, PC_ROM_SIZE,
>> option_rom_offset);
>>
>> @@ -1074,4 +1079,16 @@ void pc_pci_device_init(PCIBus *pci_bus)
>>      for (bus = 0; bus <= max_bus; bus++) {
>>          pci_create_simple(pci_bus, -1, "lsi53c895a");
>>      }
>> +
>> +    if (extboot_drive) {
>> +        DriveInfo *info = extboot_drive;
>> +        int cyls, heads, secs;
>> +
>> +        if (info->type != IF_IDE && info->type != IF_VIRTIO) {
>> +            bdrv_guess_geometry(info->bdrv, &cyls, &heads, &secs);
>> +            bdrv_set_geometry_hint(info->bdrv, cyls, heads, secs);
>> +        }
>> +
>> +        extboot_init(info->bdrv);
>> +    }
>>  }
>> diff --git a/hw/pc.h b/hw/pc.h
>> index 63b0249..61882db 100644
>> --- a/hw/pc.h
>> +++ b/hw/pc.h
>> @@ -167,6 +167,10 @@ void isa_cirrus_vga_init(void);
>>
>>  void isa_ne2000_init(int base, int irq, NICInfo *nd);
>>
>> +/* extboot.c */
>> +
>> +void extboot_init(BlockDriverState *bs);
>> +
>>  /* e820 types */
>>  #define E820_RAM        1
>>  #define E820_RESERVED   2
>> diff --git a/qemu-config.c b/qemu-config.c
>> index 95abe61..0f3c775 100644
>> --- a/qemu-config.c
>> +++ b/qemu-config.c
>> @@ -79,6 +79,10 @@ QemuOptsList qemu_drive_opts = {
>>          },{
>>              .name = "readonly",
>>              .type = QEMU_OPT_BOOL,
>> +        },{
>> +      .name = "boot",
>> +      .type = QEMU_OPT_BOOL,
>> +      .help = "make this a boot drive",
>>          },
>>          { /* end if list */ }
>>      },
>>
>>     
>
>   

BTW, I am just curious why I can not receive what I have sent to the list?

Best regards
Shan Hai