Re: [Qemu-devel] [PATCH] acpi-build: dirty memory on RSDP/linker update

[Igor Mammedov <imammedo@redhat.com>]

On Sun, 15 Feb 2015 20:46:16 +0100
"Michael S. Tsirkin" <mst@redhat.com> wrote:

> This is required to make sure they are migrated
> correctly.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>  hw/i386/acpi-build.c | 28 +++++++++++++++++++++-------
>  1 file changed, 21 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 1dfdf35..fd6ef78 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -1271,6 +1271,8 @@ struct AcpiBuildState {
>      uint8_t patched;
>      PcGuestInfo *guest_info;
>      void *rsdp;
> +    ram_addr_t rsdp_ram;
> +    uint32_t rsdp_size;
>      ram_addr_t linker_ram;
>      uint32_t linker_size;
>  } AcpiBuildState;
> @@ -1478,13 +1480,22 @@ static void acpi_build_update(void *build_opaque, uint32_t offset)
>  
>      memcpy(qemu_get_ram_ptr(build_state->table_ram), tables.table_data->data,
>             build_state->table_size);
> -    memcpy(build_state->rsdp, tables.rsdp->data, acpi_data_len(tables.rsdp));
> -    memcpy(qemu_get_ram_ptr(build_state->linker_ram), tables.linker->data,
> -           build_state->linker_size);
> -
>      cpu_physical_memory_set_dirty_range_nocode(build_state->table_ram,
>                                                 build_state->table_size);
>  
> +    if (build_state->rsdp) {
> +        memcpy(build_state->rsdp, tables.rsdp->data, acpi_data_len(tables.rsdp));
> +    } else {
> +        memcpy(qemu_get_ram_ptr(build_state->rsdp_ram), tables.linker->data,
> +               build_state->rsdp_size);
> +        cpu_physical_memory_set_dirty_range_nocode(build_state->rsdp_ram,
> +                                                   build_state->rsdp_size);
> +    }
> +    memcpy(qemu_get_ram_ptr(build_state->linker_ram), tables.linker->data,
> +           build_state->linker_size);
> +    cpu_physical_memory_set_dirty_range_nocode(build_state->linker_ram,
> +                                               build_state->linker_size);
> +
>      acpi_build_tables_cleanup(&tables, true);
>  }
>  
> @@ -1564,10 +1575,13 @@ void acpi_setup(PcGuestInfo *guest_info)
>                                   acpi_build_update, build_state,
>                                   tables.rsdp->data, acpi_data_len(tables.rsdp));
>          build_state->rsdp = tables.rsdp->data;
> +        build_state->rsdp_ram = (ram_addr_t)-1;
> +        build_state->rsdp_size = 0;
>      } else {
> -        build_state->rsdp = qemu_get_ram_ptr(
> -            acpi_add_rom_blob(build_state, tables.rsdp, ACPI_BUILD_RSDP_FILE, 0)
> -        );
> +        build_state->rsdp = NULL;
> +        build_state->rsdp_ram = acpi_add_rom_blob(build_state, tables.rsdp,
> +                                                  ACPI_BUILD_RSDP_FILE, 0);
> +        build_state->rsdp_size = acpi_data_len(tables.rsdp);
there is no point in carrying rsdp_size state since it's fixed size table so
just using acpi_data_len(tables.rsdp) or sizeof(AcpiRsdpDescriptor) is sufficient.

>      }
>  
>      qemu_register_reset(acpi_build_reset, build_state);