port-xen/58395: panic: HYPERVISOR_mmu_update failed, ret: -22

[campbell+netbsd%mumble.net@localhost]

>Number:         58395
>Category:       port-xen
>Synopsis:       panic: HYPERVISOR_mmu_update failed, ret: -22
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-xen-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jul 03 13:40:00 +0000 2024
>Originator:     Taylor R Campbell
>Release:        10
>Organization:
The NetBSD FoundEINVAL
>Environment:
NetBSD 10.0 (XEN3_DOMU) #0: Thu Mar 28 08:33:33 UTC 2024
amd64
>Description:
When booting NetBSD 10 on tornadovps, which sets `gnttab=max-ver:1':

[   1.0000000] xpq_flush_queue: 1 entries (0 successful) on cpu0 (0)
[   1.0000000] panic: HYPERVISOR_mmu_update failed, ret: -22

panic() at netbsd:panic+0x3c
xpq_flush_queue() at netbsd:xpq_flush_queue+0x100
pmap_kenter_ma() at netbsd:pmap_kenter_ma+0xcb
xengnt_finish_init() at netbsd:xengnt_finish_init+0xe9
xengnt_init() at netbsd:xengnt_init+0x139
hypervisor_attach() at netbsd:hypervisor_attach+0x279

>How-To-Repeat:
boot NetBSD 10 on tornadovps
>Fix:
Yes, please!