在 2019年04月02日 17:06, Borislav Petkov 写道:
> On Fri, Mar 29, 2019 at 08:39:13PM +0800, Lianbo Jiang wrote:
>> -static int __ioremap_check_desc_other(struct resource *res)
>> +/*
>> + * Originally, these areas described as IORES_DESC_NONE are not mapped
>> + * as encrypted when using ioremap(), for example, E820_TYPE_{RESERVED,
>> + * RESERVED_KERN,RAM,UNUSABLE}, etc. It checks for a resource that is
>> + * not described as IORES_DESC_NONE, which can make sure the reserved
>> + * areas are not mapped as encrypted when using ioremap().
>> + *
>> + * Now IORES_DESC_RESERVED has been created for the reserved areas so
>> + * the check needs to be expanded so that these areas are not mapped
>> + * encrypted when using ioremap().
>> + */
>> +static int __ioremap_check_desc_none_and_reserved(struct resource *res)
>> {
>> - return (res->desc != IORES_DESC_NONE);
>> + return ((res->desc != IORES_DESC_NONE) &&
>
> Why is this still checking IORES_DESC_NONE when the idea is to have this
> specific IORES_DESC_RESERVED for all marked as *reserved* regions in
> e820 which should not be mapped encrypted?
>
> IOW, which regions are still marked as IORES_DESC_NONE and should not be
> mapped encrypted?
>
Thanks for your comment.
These regions(E820_TYPE_{RESERVED_KERN,RAM,UNUSABLE}) are still marked as
IORES_DESC_NONE and should not be mapped encrypted when using ioremap().
Please refer to the following function.
static unsigned long __init e820_type_to_iores_desc(struct e820_entry *entry)
{
switch (entry->type) {
case E820_TYPE_ACPI: return IORES_DESC_ACPI_TABLES;
case E820_TYPE_NVS: return IORES_DESC_ACPI_NV_STORAGE;
case E820_TYPE_PMEM: return IORES_DESC_PERSISTENT_MEMORY;
case E820_TYPE_PRAM: return IORES_DESC_PERSISTENT_MEMORY_LEGACY;
case E820_TYPE_RESERVED: return IORES_DESC_RESERVED;
case E820_TYPE_RESERVED_KERN: /* Fall-through: */
case E820_TYPE_RAM: /* Fall-through: */
case E820_TYPE_UNUSABLE: /* Fall-through: */
default: return IORES_DESC_NONE;
}
}
Thanks.
Lianbo
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