Bug 53651

Summary:	nVMX: L1 crashes with no-kvm-irqchip
Product:	Virtualization	Reporter:	Nadav Har'El (nyh)
Component:	kvm	Assignee:	virtualization_kvm
Status:	NEW ---
Severity:	normal	CC:	jan.kiszka
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:		Subsystem:
Regression:	No	Bisected commit-id:
Bug Depends on:
Bug Blocks:	94971, 53601

Description Nadav Har'El 2013-02-11 14:56:05 UTC

Steffen Evers reported that "We are using qemu-kvm with nested virtualisation (two guest levels). The 1st-level guest sporadicly crashes on start-up of 2nd level guest (in BIOS). We have now found out that it always crashes with
parameter "no-kvm-irqchip" set.".
The L1 crash is because of "KVM: entry failed, hardware error 0x80000021".

See the full details in this thread:
http://comments.gmane.org/gmane.comp.emulators.kvm.devel/79054

I didn't try to verify this myself.

Comment 1 Jan Kiszka 2015-04-08 10:33:23 UTC

Steffen once did these tests for me. They were done on a now very old software stack, I no longer remember the precise details nor could I reproduce the same scenario. I can just confirm that I'm running nested with -no-kvm-irqchip regularly on a - granted - more modern host without problems. Therefore, I would suggest to close this issue.