Re: VCPUOP_send_nmi returns -38

From: Andriy Gapon <avg_at_FreeBSD.org>
Date: Thu, 13 Jan 2022 15:29:21 UTC 
On 13/01/2022 16:57, Roger Pau Monné wrote:
> I've got two patches for you to try, the first one is 'mni-fix.patch'
> and should fix the NMI sending issue.
> 
> I'm also attaching a second patch, that should allow your guest to use
> x2APIC. FreeBSD has previously prevented Xen guests from using x2APIC
> because of a bug in old Xen versions, but I think this should be
> solved now, so if FreeBSD can successfully boot on your VM with the
> patch applied I think we are safe to enable x2APIC. That one is called
> 'x2apic.patch'.
> 
> Let me know how the testing goes.

Tested both patches, both jointly and independently.

x2APIC mode gets successfully enabled:
# sysctl hw.apic
hw.apic.timer_tsc_deadline: 0
hw.apic.eoi_suppression: 0
hw.apic.x2apic_mode: 1
hw.apic.enable_extint: 0

Not seeing any obvious regressions when running with it.

NMIs are successfully sent and delivered now as well.

Thank you very much!

-- 
Andriy Gapon