Re: [Qemu-devel] [PATCH] ACPI: Add -acpifadt to allow FADT revision changes

[Igor Mammedov]

On Mon,  8 Aug 2016 15:28:33 +0800
Lv Zheng <address@hidden> wrote:

> This patch allows FADT to be built with different revisions. When the revision
> is greater than 1.0, 64-bit address fields may also be filled.
> 
> Note that FADT revision 2 has never been defined by the ACPI specification. So
> this patch only adds an option -acpifadt to allow revision 1,3,5 to be
> configured by the users.
> 
> 1. Tested by booting a linux image, the 64-bit addresses are correctly filled
>    in the dumped FADT.
> 2. Tested by booting a Windows image, no boot failure can be seen.

By itself patch's useless as currently all addresses for tables are below 4Gb
and io ports are uint16_t so they are also don't need 64bit pointers.
This patch should be a part of some series that actually makes use of it.

Could you provide a reasoning behind this patch?


> Signed-off-by: Lv Zheng <address@hidden>
> ---
>  hw/i386/acpi-build.c   |   62 
> ++++++++++++++++++++++++++++++++++++++++++------
>  include/hw/acpi/acpi.h |    1 +
>  qemu-options.hx        |    9 +++++++
>  vl.c                   |   18 ++++++++++++++
>  4 files changed, 83 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index ce7cbc5..1f664de 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -276,8 +276,22 @@ build_facs(GArray *table_data, BIOSLinker *linker)
>      facs->length = cpu_to_le32(sizeof(*facs));
>  }
>  
> +/* GAS */
> +static void
> +build_gas(struct AcpiGenericAddress *gas, uint8_t space_id,
> +       uint8_t bit_width, uint8_t bit_offset,
> +       uint8_t access_width, uint64_t address)
> +{
> +    gas->space_id = space_id;
> +    gas->bit_width = bit_width;
> +    gas->bit_offset = bit_offset;
> +    gas->access_width= access_width;
> +    gas->address = address;
> +}
> +
>  /* Load chipset information in FADT */
> -static void fadt_setup(AcpiFadtDescriptorRev1 *fadt, AcpiPmInfo *pm)
> +static void fadt_setup(AcpiFadtDescriptorRev5_1 *fadt, AcpiPmInfo *pm,
> +                       uint8_t revision)
>  {
>      fadt->model = 1;
>      fadt->reserved1 = 0;
> @@ -309,6 +323,25 @@ static void fadt_setup(AcpiFadtDescriptorRev1 *fadt, 
> AcpiPmInfo *pm)
>          fadt->flags |= cpu_to_le32(1 << 
> ACPI_FADT_F_FORCE_APIC_CLUSTER_MODEL);
>      }
>      fadt->century = RTC_CENTURY;
> +
> +    /* Build ACPI 2.0 (FADT version 3+) GAS fields */
> +    if (revision >= 3) {
> +        /* EVT, CNT, TMR register matches hw/acpi/core.c */
> +        build_gas(&fadt->xpm1a_event_block, AML_SYSTEM_IO,
> +                  32, 0, 0, cpu_to_le64(pm->io_base));
> +        build_gas(&fadt->xpm1a_control_block, AML_SYSTEM_IO,
> +                  16, 0, 0, cpu_to_le64(pm->io_base + 0x04));
> +        build_gas(&fadt->xpm_timer_block, AML_SYSTEM_IO,
> +                  32, 0, 0, cpu_to_le64(pm->io_base + 0x08));
> +        build_gas(&fadt->xgpe0_block, AML_SYSTEM_IO,
> +                  pm->gpe0_blk_len << 3, 0, 0, cpu_to_le64(pm->gpe0_blk));
> +    }
> +
> +    /* Build dummy ACPI 5.0 fields */
> +    if (revision >= 5) {
> +        build_gas(&fadt->sleep_control, AML_SYSTEM_MEMORY, 0, 0, 0, 0);
> +        build_gas(&fadt->sleep_status, AML_SYSTEM_MEMORY, 0, 0, 0, 0);
> +    }
>  }
>  
>  
> @@ -316,9 +349,9 @@ static void fadt_setup(AcpiFadtDescriptorRev1 *fadt, 
> AcpiPmInfo *pm)
>  static void
>  build_fadt(GArray *table_data, BIOSLinker *linker, AcpiPmInfo *pm,
>             unsigned facs_tbl_offset, unsigned dsdt_tbl_offset,
> -           const char *oem_id, const char *oem_table_id)
> +           const char *oem_id, const char *oem_table_id, uint8_t revision)
>  {
> -    AcpiFadtDescriptorRev1 *fadt = acpi_data_push(table_data, sizeof(*fadt));
> +    AcpiFadtDescriptorRev5_1 *fadt = acpi_data_push(table_data, 
> sizeof(*fadt));
>      unsigned fw_ctrl_offset = (char *)&fadt->firmware_ctrl - 
> table_data->data;
>      unsigned dsdt_entry_offset = (char *)&fadt->dsdt - table_data->data;
>  
> @@ -328,13 +361,28 @@ build_fadt(GArray *table_data, BIOSLinker *linker, 
> AcpiPmInfo *pm,
>          ACPI_BUILD_TABLE_FILE, facs_tbl_offset);
>  
>      /* DSDT address to be filled by Guest linker */
> -    fadt_setup(fadt, pm);
>      bios_linker_loader_add_pointer(linker,
>          ACPI_BUILD_TABLE_FILE, dsdt_entry_offset, sizeof(fadt->dsdt),
>          ACPI_BUILD_TABLE_FILE, dsdt_tbl_offset);
>  
> -    build_header(linker, table_data,
> -                 (void *)fadt, "FACP", sizeof(*fadt), 1, oem_id, 
> oem_table_id);
> +    if (revision > 2) {
> +        fw_ctrl_offset = (char *)&fadt->Xfacs - table_data->data;
> +        dsdt_entry_offset = (char *)&fadt->Xdsdt - table_data->data;
> +
> +        /* FACS address to be filled by Guest linker */
> +        bios_linker_loader_add_pointer(linker,
> +            ACPI_BUILD_TABLE_FILE, fw_ctrl_offset, sizeof(fadt->Xfacs),
> +            ACPI_BUILD_TABLE_FILE, facs_tbl_offset);
> +
> +        /* DSDT address to be filled by Guest linker */
> +        bios_linker_loader_add_pointer(linker,
> +            ACPI_BUILD_TABLE_FILE, dsdt_entry_offset, sizeof(fadt->Xdsdt),
> +            ACPI_BUILD_TABLE_FILE, dsdt_tbl_offset);
> +    }
> +
> +    fadt_setup(fadt, pm, revision);
> +    build_header(linker, table_data, (void *)fadt, "FACP", sizeof(*fadt),
> +                 revision, oem_id, oem_table_id);
>  }
>  
>  void pc_madt_cpu_entry(AcpiDeviceIf *adev, int uid,
> @@ -2681,7 +2729,7 @@ void acpi_build(AcpiBuildTables *tables, MachineState 
> *machine)
>      fadt = tables_blob->len;
>      acpi_add_table(table_offsets, tables_blob);
>      build_fadt(tables_blob, tables->linker, &pm, facs, dsdt,
> -               slic_oem.id, slic_oem.table_id);
> +               slic_oem.id, slic_oem.table_id, acpi_fadt_rev);
>      aml_len += tables_blob->len - fadt;
>  
>      acpi_add_table(table_offsets, tables_blob);
> diff --git a/include/hw/acpi/acpi.h b/include/hw/acpi/acpi.h
> index 7b3d93c..63df38d 100644
> --- a/include/hw/acpi/acpi.h
> +++ b/include/hw/acpi/acpi.h
> @@ -173,6 +173,7 @@ void acpi_update_sci(ACPIREGS *acpi_regs, qemu_irq irq);
>  
>  /* acpi.c */
>  extern int acpi_enabled;
> +extern uint8_t acpi_fadt_rev;
>  extern char unsigned *acpi_tables;
>  extern size_t acpi_tables_len;
>  
> diff --git a/qemu-options.hx b/qemu-options.hx
> index a71aaf8..cff34f6 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -1492,6 +1492,15 @@ STEXI
>  Disable HPET support.
>  ETEXI
>  
> +DEF("acpifadt", HAS_ARG, QEMU_OPTION_acpifadt, \
> +    "-acpifadt  n    configure FADT revision number (1, 3, 5)\n",
> +    QEMU_ARCH_ALL)
> +STEXI
> address@hidden -acpifadt @var{n}
> address@hidden -acpifadt
> +Configure FADT revision number, default is 1.
> +ETEXI
> +
>  DEF("acpitable", HAS_ARG, QEMU_OPTION_acpitable,
>      "-acpitable 
> [sig=str][,rev=n][,oem_id=str][,oem_table_id=str][,oem_rev=n][,asl_compiler_id=str][,asl_compiler_rev=n][,{data|file}=file1[:file2]...]\n"
>      "                ACPI table description\n", QEMU_ARCH_I386)
> diff --git a/vl.c b/vl.c
> index e7c2c62..5fe2414 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -64,6 +64,7 @@ int main(int argc, char **argv)
>  #include "hw/bt.h"
>  #include "sysemu/watchdog.h"
>  #include "hw/smbios/smbios.h"
> +#include "hw/acpi/acpi.h"
>  #include "hw/xen/xen.h"
>  #include "hw/qdev.h"
>  #include "hw/loader.h"
> @@ -158,6 +159,7 @@ int max_cpus = 1;
>  int smp_cores = 1;
>  int smp_threads = 1;
>  int acpi_enabled = 1;
> +uint8_t acpi_fadt_rev = 1;
>  int no_hpet = 0;
>  int fd_bootchk = 1;
>  static int no_reboot;
> @@ -2301,6 +2303,19 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts, 
> Error **errp)
>      return 0;
>  }
>  
> +static void fadt_parse(const char *arg)
> +{
> +    uint32_t rev;
> +
> +    rev = strtoul(arg, NULL, 0);
> +    if (rev != 1 && rev != 3 && rev != 5) {
> +        error_printf("Unsupported FADT revision %d,"
> +                     "please specify 1,3,5.\n", rev);
> +        exit(1);
> +    }
> +    acpi_fadt_rev = rev;
> +}
> +
>  static int device_help_func(void *opaque, QemuOpts *opts, Error **errp)
>  {
>      return qdev_device_help(opts);
> @@ -3622,6 +3637,9 @@ int main(int argc, char **argv, char **envp)
>                  qdev_prop_register_global(&slew_lost_ticks);
>                  break;
>              }
> +            case QEMU_OPTION_acpifadt:
> +                fadt_parse(optarg);
> +                break;
>              case QEMU_OPTION_acpitable:
>                  opts = qemu_opts_parse_noisily(qemu_find_opts("acpi"),
>                                                 optarg, true);