Hi Bupesh
On 28/01/2019 20:57, Bhupesh Sharma wrote:
With ARMv8.2-LVA and LPA architecture extensions, arm64 hardware which
supports these extensions can support upto 52-bit virtual and 52-bit
physical addresses respectively.
Since at the moment we enable the support of these extensions via CONFIG
flags, e.g.
- LPA via CONFIG_ARM64_PA_BITS_52, and
- LVA via CONFIG_ARM64_FORCE_52BIT
The easiest way a user can determine the physical/virtual
addresses supported on the hardware, is via the '/proc/cpuinfo'
interface.
Why do we need this information ?
Btw, this keeps coming up all the time and the answer to this approach is
always no. We cannot break the "unwritten" ABI of /proc/cpuinfo, again.
See :
https://patchwork.kernel.org/patch/8669301/
Suzuki
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