vgsp: pin the RC watchdog's push and notifier pages at first real decode

r834: the watchdog push's translation can go stale under heavy GL load
(the content-scanned map answering a zero page where an injected pin
previously delivered the real method stream), starving the notifier ack.
Pin the page that delivered the first real decode (svc_read_last_pa at
the SET_NOTIFY_A capture) and the page that accepted the first ack
(svc_notify2d_write), so the every-pass ack keeps resolving.

Still observed: under 150 s of sustained GZDOOM the guest's krcWatchdog
can still report 13-17 timeouts and xshm_pub's XShmGetImage never
completes (the X readback op stalls), so the capture path is not yet
usable; the X server itself stays up (4 WAIT lines / 150 s).

0 files changed, 0 insertions, 0 deletions