+ * To make this work the #HV entry code tries its best to pretend it
doesn't use
+ * an IST stack by switching to the task stack if coming from
user-space (which
+ * includes early SYSCALL entry path) or back to the stack in the
IRET frame if
+ * entered from kernel-mode.
+ *
+ * If entered from kernel-mode the return stack is validated first,
and if it is
+ * not safe to use (e.g. because it points to the entry stack) the
#HV handler
+ * will switch to a fall-back stack (HV2) and call a special handler
function.
+ *
+ * The macro is only used for one vector, but it is planned to be
extended in
+ * the future for the #HV exception.
Noticed same comment line in the #VC exception handling section (macro
idtentry_vc). Just wondering we need to remove this line as the patch
being proposed for the #HV exception handling? unless this is planned
to be extended in some other way.
Nice catch! Will remove this in the next version.
Thanks. Just a note: the referred 'idtentry_vc' macro has some
instructions added/moved (e.g CLD is moved at start of IDT entry, ENDBR
added) plus some additional comments added later. Don't know what all of
them are required to be replicated in 'idtentry_hv', just want to share
my observation.
Thanks,
Pankaj
