Re: [PATCH v6 23/34] x86, realmode: Decrypt trampoline area if memory encryption is active

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Jun 07, 2017 at 02:17:09PM -0500, Tom Lendacky wrote:
> When Secure Memory Encryption is enabled, the trampoline area must not
> be encrypted. A CPU running in real mode will not be able to decrypt
> memory that has been encrypted because it will not be able to use addresses
> with the memory encryption mask.
> 
> A recent change that added a new system_state value exposed a warning
> issued by early_ioreamp() when the system_state was not SYSTEM_BOOTING.
> At the stage where the trampoline area is decrypted, the system_state is
> now SYSTEM_SCHEDULING. The check was changed to issue a warning if the
> system_state is greater than or equal to SYSTEM_RUNNING.

This piece along with the hunk touching system_state absolutely needs to
be a separate patch as it is unrelated.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux