On 06/12/2018 12:26, Steve Capper wrote:

On Wed, Dec 05, 2018 at 06:22:27PM +0000, Suzuki K Poulose wrote:

quoted

Hi Steve,

[...]

quoted

I think we may need a check for the secondary CPUs to make sure that they have
the 52bit support once the boot CPU has decided to use the feature and fail the
CPU bring up (just like we do for the granule support).

Suzuki

Hi Suzuki,
I have just written a patch to detect a mismatch between 52-bit VA that
is being tested now.

As 52-bit kernel VA support is coming in future, the patch checks for a
mismatch during the secondary boot path and, if one is found, prevents
the secondary from booting (and displays an error message to the user).

Right now, it is the boot CPU which decides the Userspace 52bit VA, isn't it ?
Irrespective of the kernel VA support, the userspace must be able to run on
all the CPUs on the system, right ? So don't we need it now, with this series ?


Cheers
Suzuki

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