Re: [Xen-devel] [PATCH v6 01/22] arm/acpi: Estimate memory required for acpi/efi tables

[Julien Grall <julien.grall@xxxxxxx>]

Hi Shannon,

On 17/03/2016 09:40, Shannon Zhao wrote:

[...]
> +static int prepare_acpi(struct domain *d, struct kernel_info *kinfo)
> +{
> +    int rc = 0;
> +    int order;
> +
> +    rc = estimate_acpi_efi_size(d, kinfo);
> +    if ( rc != 0 )
> +        return rc;
> +
> +    order = get_order_from_bytes(d->arch.efi_acpi_len);
> +    d->arch.efi_acpi_table = alloc_xenheap_pages(order, 0);
> +    if ( d->arch.efi_acpi_table == NULL )
> +    {
> +        printk("unable to allocate memory!\n");
> +        return -ENOMEM;
> +    }
> +    memset(d->arch.efi_acpi_table, 0, d->arch.efi_acpi_len);
> +
> +    /* For ACPI, Dom0 doesn't use kinfo->gnttab_start to get the grant table
> +     * region. So we use it as the ACPI table mapped address. */
> +    d->arch.efi_acpi_gpa = kinfo->gnttab_start;
I forgot to mention it on the last mail. If you re-use the gnttab 
region, you need to make sure that the region size will be enough to fit 
the ACPI tables.
It will help for debugging if we reach the limit in the future.

> +
> +    return 0;
[...]

Regards,

--
Julien Grall

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