On 5/9/2024 10:36 AM, Dave Hansen wrote:
I'd probably just do this:
+ kernel_fpu_begin();
+ // AMX *MUST* be in the init state for the wrmsr() to work.
+ // But, the more in the init state, the less state the test
+ // has to save and restore. Just zap everything.
+ restore_fpregs_from_fpstate(&init_fpstate,
+ fpu_user_cfg.max_features);
+
I assume that this snippet goes to the IFS driver side. Then, we need to
introduce and export a new wrapper for this.
restore_fpregs_from_fpstate() and its arguments are not accessible as of
now.
Also, I think we should encapsulate them. If we follow this style, we
could have invoked tilerelease() directly from the idle driver, right?
wrmsrl(MSR_ACTIVATE_SCAN, params->activate->data);
rdmsrl(MSR_SCAN_STATUS, status.data);
+ kernel_fpu_end();
