CVS commit: src/sys/arch/xen/x86

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Sun Aug  6 16:07:53 UTC 2023

Modified Files:
        src/sys/arch/xen/x86: xen_ipi.c

Log Message:
xen/x86: Get the right intrframe pointer in ddb ipi.

This was broken with the transition from evtchn_set_handler to
intr_establish_xname in 2017, remained broken with the transition
from intr_establish_xname to xen_intr_establish_xname in 2018, and
still remained broken when xen_intr_establish_xname was changed back
to evtchn_set_handler in 2020.

The mechanism is grody -- instead of a secret second argument to the
interrupt handler, the intrframe pointer should be replaced by a
struct cpu_info member that is saved and restored by the interrupt
handler calling logic.  But we should make sure the replacement
actually works first -- which is not trivial in part because the
users are hidden behind sketchy function pointer casts.

With any luck, this will make `mach cpu N' work in ddb on Xen.

XXX pullup-10
XXX pullup-9 (by patch)


To generate a diff of this commit:
cvs rdiff -u -r1.40 -r1.41 src/sys/arch/xen/x86/xen_ipi.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.