Re: [Xen-devel] [PATCH v7 01/22] arm/acpi: Estimate memory required for acpi/efi tables

[Julien Grall <julien.grall@xxxxxxx>]

Hi Shannon,

On 25/03/16 13:48, Shannon Zhao wrote:

[...]

> +static int estimate_acpi_efi_size(struct domain *d, struct kernel_info *kinfo)
> +{
> +    size_t efi_size, acpi_size, madt_size;
> +    u64 addr;
> +    struct acpi_table_rsdp *rsdp_tbl;
> +    struct acpi_table_header *table;
> +
> +    efi_size = estimate_efi_size(kinfo->mem.nr_banks);
> +
> +    acpi_size = ROUNDUP(sizeof(struct acpi_table_fadt), 8);
> +    acpi_size += ROUNDUP(sizeof(struct acpi_table_stao), 8);
> +
> +    madt_size = sizeof(struct acpi_table_madt)
> +                + sizeof(struct acpi_madt_generic_interrupt) * d->max_vcpus
> +                + sizeof(struct acpi_madt_generic_distributor);
> +    if ( d->arch.vgic.version == GIC_V3 )
> +        madt_size += sizeof(struct acpi_madt_generic_redistributor)
> +                     * d->arch.vgic.nr_regions;
> +    acpi_size += ROUNDUP(madt_size, 8);
> +
> +    addr = acpi_os_get_root_pointer();
> +    if ( !addr )
> +    {
> +        printk("Unable to get acpi root pointer\n");
> +        return -EINVAL;
> +    }
> +
> +    rsdp_tbl = acpi_os_map_memory(addr, sizeof(struct acpi_table_rsdp));
> +    if ( !rsdp_tbl )
> +    {
> +        printk("Unable to map RSDP table\n");
> +        return -EINVAL;
> +    }
> +
> +    table = acpi_os_map_memory(rsdp_tbl->xsdt_physical_address,
> +                               sizeof(struct acpi_table_header));
> +    if ( !table )
rsdp_tbl will be left mapped if Xen fails to map the XSDT.

As you don't use rsdp_tbl later, I would move 
acpi_os_unmap_memory(rsdp_tlb,...) here.
With this change:

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


> +    {
> +        printk("Unable to map XSDT table\n");
> +        return -EINVAL;
> +    }
> +
> +    /* Add place for STAO table in XSDT table */
> +    acpi_size += ROUNDUP(table->length + sizeof(u64), 8);
> +    acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
> +    acpi_os_unmap_memory(rsdp_tbl, sizeof(struct acpi_table_rsdp));
> +
> +    acpi_size += ROUNDUP(sizeof(struct acpi_table_rsdp), 8);
> +    d->arch.efi_acpi_len = PAGE_ALIGN(ROUNDUP(efi_size, 8)
> +                                      + ROUNDUP(acpi_size, 8));
> +
> +    return 0;
> +}
Regards,

--
Julien Grall

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