Re: [PATCH 3/6] intel_sgx: driver for Intel Secure Guard eXtensions

[Jethro Beekman]

On 27-04-16 05:40, Jarkko Sakkinen wrote:
>> The hardware supports calling EEXTEND on only a part of a page, I think the
>> driver should also support that.
>
> Why would you want to do that?

You might have segments in a binary that don't start at the beginning of a page
or that end before the end of a page. For example:

  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x000000000001bcac 0x000000000001bcac  R E    1000
  LOAD           0x000000000001c8e8 0x000000000001c8e8 0x000000000001c8e8
                 0x0000000000000790 0x0000000000000c68  RW     1000

There's no need to measure the extra padding (0x1bd00--0x1c7ff and
0x1cb00--0x1cfff) in this case.

> /Jarkko

Jethro