* nVMX: APICv seems to cause breakages
@ 2014-10-20 13:11 Jan Kiszka
2014-10-21 1:00 ` Zhang, Yang Z
2014-10-21 12:30 ` Wanpeng Li
0 siblings, 2 replies; 3+ messages in thread
From: Jan Kiszka @ 2014-10-20 13:11 UTC (permalink / raw)
To: Bandan Das, Zhang, Yang Z, Wanpeng Li; +Cc: kvm, Henning Schild
Hi all,
we just started a test with Jailhouse in a VM on a decently recent Intel
box. It has APICv / posted interrupts support. And it breaks Jailhouse
activation (L1 breakage, host seems to be fine). Loading kvm-intel with
enable_apicv=0 resolves the issue. Henning started to debug from
Jailhouse POV and found out it may be NMI IPI related. We will try to
dig deeper, but any support is welcome regarding the APICv specialties.
Could this also explain some of the incompatibilities you found, Yang?
Maybe you want to check if more hypervisor work when APICv is off.
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
^ permalink raw reply [flat|nested] 3+ messages in thread
* RE: nVMX: APICv seems to cause breakages
2014-10-20 13:11 nVMX: APICv seems to cause breakages Jan Kiszka
@ 2014-10-21 1:00 ` Zhang, Yang Z
2014-10-21 12:30 ` Wanpeng Li
1 sibling, 0 replies; 3+ messages in thread
From: Zhang, Yang Z @ 2014-10-21 1:00 UTC (permalink / raw)
To: Jan Kiszka, Bandan Das, Wanpeng Li; +Cc: kvm, Henning Schild
Jan Kiszka wrote on 2014-10-20:
> Hi all,
>
> we just started a test with Jailhouse in a VM on a decently recent Intel
> box. It has APICv / posted interrupts support. And it breaks Jailhouse
> activation (L1 breakage, host seems to be fine). Loading kvm-intel with
> enable_apicv=0 resolves the issue. Henning started to debug from
> Jailhouse POV and found out it may be NMI IPI related. We will try to
> dig deeper, but any support is welcome regarding the APICv specialties.
It is interesting. I will spend some time to look this issue too.
>
> Could this also explain some of the incompatibilities you found, Yang?
Maybe, I will do a double check.
> Maybe you want to check if more hypervisor work when APICv is off.
>
> Jan
>
Best regards,
Yang
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: nVMX: APICv seems to cause breakages
2014-10-20 13:11 nVMX: APICv seems to cause breakages Jan Kiszka
2014-10-21 1:00 ` Zhang, Yang Z
@ 2014-10-21 12:30 ` Wanpeng Li
1 sibling, 0 replies; 3+ messages in thread
From: Wanpeng Li @ 2014-10-21 12:30 UTC (permalink / raw)
To: Jan Kiszka, Bandan Das, Zhang, Yang Z, Wanpeng Li; +Cc: kvm, Henning Schild
于 10/20/14, 9:11 PM, Jan Kiszka 写道:
> Hi all,
>
> we just started a test with Jailhouse in a VM on a decently recent Intel
> box. It has APICv / posted interrupts support. And it breaks Jailhouse
> activation (L1 breakage, host seems to be fine). Loading kvm-intel with
> enable_apicv=0 resolves the issue. Henning started to debug from
> Jailhouse POV and found out it may be NMI IPI related. We will try to
> dig deeper, but any support is welcome regarding the APICv specialties.
>
> Could this also explain some of the incompatibilities you found, Yang?
> Maybe you want to check if more hypervisor work when APICv is off.
I will check it tomorrow. ;-)
Regards,
Wanpeng Li
> Jan
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-10-20 13:11 nVMX: APICv seems to cause breakages Jan Kiszka
2014-10-21 1:00 ` Zhang, Yang Z
2014-10-21 12:30 ` Wanpeng Li
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