On 1/29/2021 11:15 AM, Dave Hansen wrote:
On 1/29/21 10:56 AM, Yu, Yu-cheng wrote:
On 1/29/2021 9:07 AM, Dave Hansen wrote:
On 1/27/21 1:25 PM, Yu-cheng Yu wrote:
[...]
What's the point of doing copy_status_to_user() if the processor doesn't
support CET? In other words, shouldn't this be below the CPU feature
check?
The thought was to tell the difference between the kernel itself does
not support CET and the system does not have CET. And, if the kernel
supports it, show CET status of the thread.
Why would that matter to userspace?
If they want to know if the processor has CET support there are existing
ways to do it. I don't think this should be part of the ABI.
Ok, I will make it:
if (!cpu_feature_enabled(X86_FEATURE_CET))
...
