On 11/28/2023 10:58 PM, Edgecombe, Rick P wrote:
On Fri, 2023-11-24 at 00:53 -0500, Yang Weijiang wrote:
+ /*
+ * Set guest's __user_state_size to fpu_user_cfg.default_size
so that
+ * existing uAPIs can still work.
+ */
+ fpu->guest_perm.__user_state_size =
fpu_user_cfg.default_size;
It seems like an appropriate value, but where does this come into play
exactly for guest FPUs?
I don't see there's special usage of this field for vCPU in VMM userspace(QEMU).
Maybe it's mainly for AMX resulted usespace fault handling? For vCPU thread,
it's only referenced when AMX is enabled via __xfd_enable_feature() .
