From: Avi Kivity <avi@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: kvm-devel <kvm@vger.kernel.org>
Subject: Re: BUG with Win7 and user-return-notifier
Date: Thu, 29 Oct 2009 18:49:03 +0200 [thread overview]
Message-ID: <4AE9C77F.8010604@redhat.com> (raw)
In-Reply-To: <4AE9BDD1.3050001@siemens.com>
On 10/29/2009 06:07 PM, Jan Kiszka wrote:
>
> Question: When a VCPU migrates, what syncs the shared_msrs per-cpu vars
> before or after that, or why is this no problem?
>
>
The guest's msrs remain on the old cpu (until a new guest is switched in
or we return to userspace). The guest msrs are loaded into the new cpu
when vmx_save_host_state() is called as part or kvm_arch_vcpu_load().
> I'm currently following the theory that guest_msrs contains some
> non-EFER entry with 0 value, but shared_msrs has a different index in
> the slot passed to kvm_set_shared_msr.
>
That's a global...
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
prev parent reply other threads:[~2009-10-29 16:49 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-27 12:52 BUG with Win7 and user-return-notifier Jan Kiszka
2009-10-27 13:11 ` Avi Kivity
2009-10-27 13:13 ` Jan Kiszka
2009-10-27 13:24 ` Avi Kivity
2009-10-27 13:25 ` Avi Kivity
2009-10-28 8:18 ` Avi Kivity
2009-10-28 14:01 ` Jan Kiszka
2009-10-28 16:00 ` Avi Kivity
2009-10-28 19:55 ` Jan Kiszka
[not found] ` <4AE8AC20.50506@web.de>
2009-10-29 7:37 ` Avi Kivity
2009-10-29 8:03 ` Jan Kiszka
2009-10-29 8:06 ` Jan Kiszka
2009-10-29 8:07 ` Avi Kivity
2009-10-29 8:32 ` Jan Kiszka
2009-10-29 15:45 ` Jan Kiszka
2009-10-29 16:05 ` Avi Kivity
2009-10-29 16:07 ` Jan Kiszka
2009-10-29 16:14 ` Jan Kiszka
2009-10-29 16:52 ` Avi Kivity
2009-10-29 16:49 ` Avi Kivity [this message]
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