Re: [Qemu-devel] [PATCH v3 01/26] blockdev: Introduce a default machine blockdev interface field, QEMUMachine->mach_if

[Markus Armbruster]

Jason Baron <address@hidden> writes:

> From: Jason Baron <address@hidden>
>
> The current QEMUMachine definition has a 'use_scsi' field to indicate if a
> machine type should use scsi by default. However, Q35 wants to use ahci by
> default. Thus, introdue a new field in the QEMUMachine defintion, mach_if.

Even though q35's desire to default to IF_AHCI is driving this patch,
generalizing the default interface type makes sense on its own.  Even if
we IF_AHCI should turn out to need more discussion.

> This field should be initialized by the machine type to the default interface
> type which it wants to use (IF_SCSI, IF_AHCI, etc.). If no mach_if is defined,
> or it is set to 'IF_DEFAULT' or 'IF_NONE', we currently assume IF_IDE.
>
> Please use 'static inline int get_mach_if(int mach_if)', when accesssing the
> new mach_if field.
>
> Reviewed-by: Paolo Bonzini <address@hidden>
> Signed-off-by: Jason Baron <address@hidden>
> ---
>  blockdev.c          |    4 ++--
>  blockdev.h          |   19 +++++++++++++++++++
>  hw/boards.h         |    2 +-
>  hw/device-hotplug.c |    2 +-
>  hw/highbank.c       |    2 +-
>  hw/leon3.c          |    2 +-
>  hw/mips_jazz.c      |    4 ++--
>  hw/pc_sysfw.c       |    2 +-
>  hw/puv3.c           |    2 +-
>  hw/realview.c       |    6 +++---
>  hw/spapr.c          |    2 +-
>  hw/sun4m.c          |   24 ++++++++++++------------
>  hw/versatilepb.c    |    4 ++--
>  hw/vexpress.c       |    4 ++--
>  hw/xilinx_zynq.c    |    2 +-
>  vl.c                |   20 +++++++++++---------
>  16 files changed, 61 insertions(+), 40 deletions(-)
>
> diff --git a/blockdev.c b/blockdev.c
> index 99828ad..c9a49c8 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -275,7 +275,7 @@ static bool do_check_io_limits(BlockIOLimit *io_limits)
>      return true;
>  }
>  
> -DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
> +DriveInfo *drive_init(QemuOpts *opts, int mach_if)

BlockInterfaceType mach_if

Suggest to rename mach_if to something more descriptive.  Kevin's
default_drive_if works for me.

>  {
>      const char *buf;
>      const char *file = NULL;
> @@ -325,7 +325,7 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
>              return NULL;
>       }
>      } else {
> -        type = default_to_scsi ? IF_SCSI : IF_IDE;
> +        type = get_mach_if(mach_if);
>      }
>  
>      max_devs = if_max_devs[type];
> diff --git a/blockdev.h b/blockdev.h
> index 5f27b64..8b126ad 100644
> --- a/blockdev.h
> +++ b/blockdev.h
> @@ -40,6 +40,22 @@ struct DriveInfo {
>      int refcount;
>  };
>  
> +/*
> + * Each qemu machine type defines a mach_if field for its default
> + * interface type. If its unspecified, we set it to IF_IDE.
> + */
> +static inline int get_mach_if(int mach_if)

BlockInterfaceType mach_if, and return type.

> +{
> +    assert(mach_if < IF_COUNT);
> +    assert(mach_if >= IF_DEFAULT);
> +
> +    if ((mach_if == IF_NONE) || (mach_if == IF_DEFAULT)) {
> +        return IF_IDE;
> +    }
> +
> +    return mach_if;
> +}
> +

I'm not sure we should map IF_NONE to IF_IDE.

get_mach_if() should return an interface type the board supports.  In
theory, we could have a board that doesn't define any controllers, but
still lets the user define some with -device (say because the board
sports a PCI bus).  Then IF_NONE would be the only interface type that
makes any sense, and therefore the only sensible value of get_mach_if().

If we drop the magic mapping of IF_NONE, only IF_DEFAULT is left, and
that one's clearly marked "for use with drive_add() only".  No real need
for magic mapping then.  Could drop get_mach_if() and use mach_if
directly.

>  DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit);
>  DriveInfo *drive_get_by_index(BlockInterfaceType type, int index);
>  int drive_get_max_bus(BlockInterfaceType type);
> @@ -61,4 +77,7 @@ void qmp_change_blockdev(const char *device, const char 
> *filename,
>                           bool has_format, const char *format, Error **errp);
>  void do_commit(Monitor *mon, const QDict *qdict);
>  int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
> +
> +
> +
>  #endif

Unnecessary whitespace change, suggest to drop hunk.

> diff --git a/hw/boards.h b/hw/boards.h
> index a2e0a54..969fd67 100644
> --- a/hw/boards.h
> +++ b/hw/boards.h
> @@ -20,7 +20,7 @@ typedef struct QEMUMachine {
>      const char *desc;
>      QEMUMachineInitFunc *init;
>      QEMUMachineResetFunc *reset;
> -    int use_scsi;
> +    int mach_if;

BlockInterfaceType mach_if

>      int max_cpus;
>      unsigned int no_serial:1,
>          no_parallel:1,
> diff --git a/hw/device-hotplug.c b/hw/device-hotplug.c
> index eec0fe3..33302f9 100644
> --- a/hw/device-hotplug.c
> +++ b/hw/device-hotplug.c
> @@ -39,7 +39,7 @@ DriveInfo *add_init_drive(const char *optstr)
>      if (!opts)
>          return NULL;
>  
> -    dinfo = drive_init(opts, current_machine->use_scsi);
> +    dinfo = drive_init(opts, current_machine->mach_if);
>      if (!dinfo) {
>          qemu_opts_del(opts);
>          return NULL;
> diff --git a/hw/highbank.c b/hw/highbank.c
> index 11aa131..35cef06 100644
> --- a/hw/highbank.c
> +++ b/hw/highbank.c
> @@ -324,7 +324,7 @@ static QEMUMachine highbank_machine = {
>      .name = "highbank",
>      .desc = "Calxeda Highbank (ECX-1000)",
>      .init = highbank_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>      .max_cpus = 4,
>  };
>  
> diff --git a/hw/leon3.c b/hw/leon3.c
> index 7a9729d..cf9dcf8 100644
> --- a/hw/leon3.c
> +++ b/hw/leon3.c
> @@ -214,7 +214,7 @@ static QEMUMachine leon3_generic_machine = {
>      .name     = "leon3_generic",
>      .desc     = "Leon-3 generic",
>      .init     = leon3_generic_hw_init,
> -    .use_scsi = 0,
> +    .mach_if = IF_DEFAULT,
>  };
>  
>  static void leon3_machine_init(void)
> diff --git a/hw/mips_jazz.c b/hw/mips_jazz.c
> index db927f1..1c7a725 100644
> --- a/hw/mips_jazz.c
> +++ b/hw/mips_jazz.c
> @@ -325,14 +325,14 @@ static QEMUMachine mips_magnum_machine = {
>      .name = "magnum",
>      .desc = "MIPS Magnum",
>      .init = mips_magnum_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static QEMUMachine mips_pica61_machine = {
>      .name = "pica61",
>      .desc = "Acer Pica 61",
>      .init = mips_pica61_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static void mips_jazz_machine_init(void)
> diff --git a/hw/pc_sysfw.c b/hw/pc_sysfw.c
> index b45f0ac..b8a03a6 100644
> --- a/hw/pc_sysfw.c
> +++ b/hw/pc_sysfw.c
> @@ -98,7 +98,7 @@ static void pc_fw_add_pflash_drv(void)
>        return;
>      }
>  
> -    drive_init(opts, machine->use_scsi);
> +    drive_init(opts, machine->mach_if);
>  }
>  
>  static void pc_system_flash_init(MemoryRegion *rom_memory,
> diff --git a/hw/puv3.c b/hw/puv3.c
> index 43f7216..f68bb61 100644
> --- a/hw/puv3.c
> +++ b/hw/puv3.c
> @@ -120,7 +120,7 @@ static QEMUMachine puv3_machine = {
>      .desc = "PKUnity Version-3 based on UniCore32",
>      .init = puv3_init,
>      .is_default = 1,
> -    .use_scsi = 0,
> +    .mach_if = IF_DEFAULT,
>  };
>  
>  static void puv3_machine_init(void)
> diff --git a/hw/realview.c b/hw/realview.c
> index 19db4d0..7613f68 100644
> --- a/hw/realview.c
> +++ b/hw/realview.c
> @@ -382,14 +382,14 @@ static QEMUMachine realview_eb_machine = {
>      .name = "realview-eb",
>      .desc = "ARM RealView Emulation Baseboard (ARM926EJ-S)",
>      .init = realview_eb_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static QEMUMachine realview_eb_mpcore_machine = {
>      .name = "realview-eb-mpcore",
>      .desc = "ARM RealView Emulation Baseboard (ARM11MPCore)",
>      .init = realview_eb_mpcore_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>      .max_cpus = 4,
>  };
>  
> @@ -403,7 +403,7 @@ static QEMUMachine realview_pbx_a9_machine = {
>      .name = "realview-pbx-a9",
>      .desc = "ARM RealView Platform Baseboard Explore for Cortex-A9",
>      .init = realview_pbx_a9_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>      .max_cpus = 4,
>  };
>  
> diff --git a/hw/spapr.c b/hw/spapr.c
> index 09b8e99..be8129e 100644
> --- a/hw/spapr.c
> +++ b/hw/spapr.c
> @@ -913,7 +913,7 @@ static QEMUMachine spapr_machine = {
>      .reset = ppc_spapr_reset,
>      .max_cpus = MAX_CPUS,
>      .no_parallel = 1,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static void spapr_machine_init(void)
> diff --git a/hw/sun4m.c b/hw/sun4m.c
> index a04b485..101d552 100644
> --- a/hw/sun4m.c
> +++ b/hw/sun4m.c
> @@ -1400,7 +1400,7 @@ static QEMUMachine ss5_machine = {
>      .name = "SS-5",
>      .desc = "Sun4m platform, SPARCstation 5",
>      .init = ss5_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>      .is_default = 1,
>  };
>  
> @@ -1408,7 +1408,7 @@ static QEMUMachine ss10_machine = {
>      .name = "SS-10",
>      .desc = "Sun4m platform, SPARCstation 10",
>      .init = ss10_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>      .max_cpus = 4,
>  };
>  
> @@ -1416,7 +1416,7 @@ static QEMUMachine ss600mp_machine = {
>      .name = "SS-600MP",
>      .desc = "Sun4m platform, SPARCserver 600MP",
>      .init = ss600mp_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>      .max_cpus = 4,
>  };
>  
> @@ -1424,7 +1424,7 @@ static QEMUMachine ss20_machine = {
>      .name = "SS-20",
>      .desc = "Sun4m platform, SPARCstation 20",
>      .init = ss20_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>      .max_cpus = 4,
>  };
>  
> @@ -1432,35 +1432,35 @@ static QEMUMachine voyager_machine = {
>      .name = "Voyager",
>      .desc = "Sun4m platform, SPARCstation Voyager",
>      .init = vger_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static QEMUMachine ss_lx_machine = {
>      .name = "LX",
>      .desc = "Sun4m platform, SPARCstation LX",
>      .init = ss_lx_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static QEMUMachine ss4_machine = {
>      .name = "SS-4",
>      .desc = "Sun4m platform, SPARCstation 4",
>      .init = ss4_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static QEMUMachine scls_machine = {
>      .name = "SPARCClassic",
>      .desc = "Sun4m platform, SPARCClassic",
>      .init = scls_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static QEMUMachine sbook_machine = {
>      .name = "SPARCbook",
>      .desc = "Sun4m platform, SPARCbook",
>      .init = sbook_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static const struct sun4d_hwdef sun4d_hwdefs[] = {
> @@ -1677,7 +1677,7 @@ static QEMUMachine ss1000_machine = {
>      .name = "SS-1000",
>      .desc = "Sun4d platform, SPARCserver 1000",
>      .init = ss1000_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>      .max_cpus = 8,
>  };
>  
> @@ -1685,7 +1685,7 @@ static QEMUMachine ss2000_machine = {
>      .name = "SS-2000",
>      .desc = "Sun4d platform, SPARCcenter 2000",
>      .init = ss2000_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>      .max_cpus = 20,
>  };
>  
> @@ -1861,7 +1861,7 @@ static QEMUMachine ss2_machine = {
>      .name = "SS-2",
>      .desc = "Sun4c platform, SPARCstation 2",
>      .init = ss2_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static void sun4m_register_types(void)
> diff --git a/hw/versatilepb.c b/hw/versatilepb.c
> index 7b1b025..af5120f 100644
> --- a/hw/versatilepb.c
> +++ b/hw/versatilepb.c
> @@ -374,14 +374,14 @@ static QEMUMachine versatilepb_machine = {
>      .name = "versatilepb",
>      .desc = "ARM Versatile/PB (ARM926EJ-S)",
>      .init = vpb_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static QEMUMachine versatileab_machine = {
>      .name = "versatileab",
>      .desc = "ARM Versatile/AB (ARM926EJ-S)",
>      .init = vab_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>  };
>  
>  static void versatile_machine_init(void)
> diff --git a/hw/vexpress.c b/hw/vexpress.c
> index 3596d1e..3c7c012 100644
> --- a/hw/vexpress.c
> +++ b/hw/vexpress.c
> @@ -495,7 +495,7 @@ static QEMUMachine vexpress_a9_machine = {
>      .name = "vexpress-a9",
>      .desc = "ARM Versatile Express for Cortex-A9",
>      .init = vexpress_a9_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>      .max_cpus = 4,
>  };
>  
> @@ -503,7 +503,7 @@ static QEMUMachine vexpress_a15_machine = {
>      .name = "vexpress-a15",
>      .desc = "ARM Versatile Express for Cortex-A15",
>      .init = vexpress_a15_init,
> -    .use_scsi = 1,
> +    .mach_if = IF_SCSI,
>      .max_cpus = 4,
>  };
>  
> diff --git a/hw/xilinx_zynq.c b/hw/xilinx_zynq.c
> index fd46ba2..c70eb69 100644
> --- a/hw/xilinx_zynq.c
> +++ b/hw/xilinx_zynq.c
> @@ -178,7 +178,7 @@ static QEMUMachine zynq_machine = {
>      .name = "xilinx-zynq-a9",
>      .desc = "Xilinx Zynq Platform Baseboard for Cortex-A9",
>      .init = zynq_init,
> -    .use_scsi = 1,
> +    .if_default = IF_SCSI,
>      .max_cpus = 1,
>      .no_sdcard = 1
>  };

Didn't check you covered all boards.

> diff --git a/vl.c b/vl.c
> index 5b357a3..6b1e546 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -802,9 +802,9 @@ static int parse_sandbox(QemuOpts *opts, void *opaque)
>  
>  static int drive_init_func(QemuOpts *opts, void *opaque)
>  {
> -    int *use_scsi = opaque;
> +    int *mach_if = opaque;

BlockInterfaceType *mach_if

>  
> -    return drive_init(opts, *use_scsi) == NULL;
> +    return drive_init(opts, *mach_if) == NULL;
>  }
>  
>  static int drive_enable_snapshot(QemuOpts *opts, void *opaque)
> @@ -815,14 +815,14 @@ static int drive_enable_snapshot(QemuOpts *opts, void 
> *opaque)
>      return 0;
>  }
>  
> -static void default_drive(int enable, int snapshot, int use_scsi,
> +static void default_drive(int enable, int snapshot, int mach_if,

BlockInterfaceType mach_if

>                            BlockInterfaceType type, int index,
>                            const char *optstr)
>  {
>      QemuOpts *opts;
>  
>      if (type == IF_DEFAULT) {
> -        type = use_scsi ? IF_SCSI : IF_IDE;
> +        type = get_mach_if(mach_if);
>      }
>  
>      if (!enable || drive_get_by_index(type, index)) {
> @@ -833,7 +833,7 @@ static void default_drive(int enable, int snapshot, int 
> use_scsi,
>      if (snapshot) {
>          drive_enable_snapshot(opts, NULL);
>      }
> -    if (!drive_init(opts, use_scsi)) {
> +    if (!drive_init(opts, mach_if)) {
>          exit(1);
>      }
>  }
> @@ -3547,14 +3547,16 @@ int main(int argc, char **argv, char **envp)
>      /* open the virtual block devices */
>      if (snapshot)
>          qemu_opts_foreach(qemu_find_opts("drive"), drive_enable_snapshot, 
> NULL, 0);
> -    if (qemu_opts_foreach(qemu_find_opts("drive"), drive_init_func, 
> &machine->use_scsi, 1) != 0)
> +    if (qemu_opts_foreach(qemu_find_opts("drive"), drive_init_func,
> +                          &machine->mach_if, 1) != 0) {
>          exit(1);
> +    }
>  
> -    default_drive(default_cdrom, snapshot, machine->use_scsi,
> +    default_drive(default_cdrom, snapshot, machine->mach_if,
>                    IF_DEFAULT, 2, CDROM_OPTS);
> -    default_drive(default_floppy, snapshot, machine->use_scsi,
> +    default_drive(default_floppy, snapshot, machine->mach_if,
>                    IF_FLOPPY, 0, FD_OPTS);
> -    default_drive(default_sdcard, snapshot, machine->use_scsi,
> +    default_drive(default_sdcard, snapshot, machine->mach_if,
>                    IF_SD, 0, SD_OPTS);
>  
>      register_savevm_live(NULL, "ram", 0, 4, &savevm_ram_handlers, NULL);