Re: [Xen-devel] [PATCH v6 08/22] arm/acpi: Prepare RSDP table for Dom0

[Julien Grall <julien.grall@xxxxxxx>]

Hi Shannon,

On 17/03/2016 09:40, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
>
> Copy RSDP table and replace rsdp->xsdt_physical_address with new address
                                                              ^ the
> of XSDT table, so it can point to the right XSDT table.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
With the 2 changes mentioned:

Acked-by: Julien Grall <julien.grall@xxxxxxx>

> ---
>   xen/arch/arm/domain_build.c | 36 ++++++++++++++++++++++++++++++++++++
>   1 file changed, 36 insertions(+)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index f9fe289..ea7d6a5 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -1357,6 +1357,38 @@ static int prepare_dtb(struct domain *d, struct 
> kernel_info *kinfo)
>   }
>
>   #ifdef CONFIG_ACPI
> +static int acpi_create_rsdp(struct domain *d, struct membank tbl_add[])
> +{
> +
> +    struct acpi_table_rsdp *rsdp = NULL;
> +    u64 addr;
> +    u64 table_size = sizeof(struct acpi_table_rsdp);
> +    u8 *base_ptr;
> +    u8 checksum;
> +
> +    addr = acpi_os_get_root_pointer();
> +    if( !addr )
> +        panic("Unable to get acpi root pointer\n");
Please avoid panic when it's possible.

> +
> +    rsdp = acpi_os_map_memory(addr, table_size);
> +    base_ptr = d->arch.efi_acpi_table
> +               + acpi_get_table_offset(tbl_add, TBL_RSDP);
> +    ACPI_MEMCPY(base_ptr, rsdp, table_size);
> +    acpi_os_unmap_memory(rsdp, table_size);
> +
> +    rsdp = (struct acpi_table_rsdp *)base_ptr;
> +    /* Replace xsdt_physical_address */
> +    rsdp->xsdt_physical_address = tbl_add[TBL_XSDT].start;
> +    checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, rsdp), table_size);
> +    rsdp->checksum = rsdp->checksum - checksum;
> +
> +    tbl_add[TBL_RSDP].start = d->arch.efi_acpi_gpa
> +                              + acpi_get_table_offset(tbl_add, TBL_RSDP);
> +    tbl_add[TBL_RSDP].size = table_size;
> +
> +    return 0;
> +}
> +
>   static void acpi_xsdt_modify_entry(u64 entry[], unsigned long entry_count,
>                                      char *signature, u64 addr)
>   {
> @@ -1625,6 +1657,10 @@ static int prepare_acpi(struct domain *d, struct 
> kernel_info *kinfo)
>       if ( rc != 0 )
>           return rc;
>
> +    rc = acpi_create_rsdp(d, tbl_add);
> +    if ( rc != 0 )
> +        return rc;
> +
>       return 0;
>   }
>   #else
Regards,

--
Julien Grall

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