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Date: Fri, 28 Aug 2015 16:57:46 +0200 (CEST)
From: Alexandre DERUMIER <aderumier@odiso.com>
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Subject: Re: [Qemu-devel] Steal time MSR not set properly during
	live	migration?
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To: Michael Tokarev <mjt@tls.msk.ru>
Cc: debian-admin@lists.debian.org, Marcelo Tosatti <mtosatti@redhat.com>, qemu-devel <qemu-devel@nongnu.org>, Gleb Natapov <gleb@redhat.com>

Hi,

I have add this bug today on 3 debian jessie guests (kernel 3.16), after mi=
gration from qemu 2.3 to qemu 2.4.

Is it a qemu bug or guest kernel 3.16 ?

Regards,

Alexandre Derumier


----- Mail original -----
De: "Michael Tokarev" <mjt@tls.msk.ru>
=C3=80: "qemu-devel" <qemu-devel@nongnu.org>, debian-admin@lists.debian.org
Cc: "Marcelo Tosatti" <mtosatti@redhat.com>, "Gleb Natapov" <gleb@redhat.co=
m>
Envoy=C3=A9: Jeudi 11 Juin 2015 23:42:02
Objet: Re: [Qemu-devel] Steal time MSR not set properly during live=09migra=
tion?

11.06.2015 23:46, Apollon Oikonomopoulos wrote:=20
> On 15:12 Wed 03 Jun , Apollon Oikonomopoulos wrote:=20
>> Any ideas?=20
>=20
> As far as I understand, there is an issue when reading the MSR on the=20
> incoming side: there is a KVM_SET_MSRS vcpu ioctl issued by the main=20
> thread during initialization, that causes the initial vCPU steal time=20
> value to be set using the main thread's (and not the vCPU thread's)=20
> run_delay. Then, upon resuming execution, kvm_arch_load_vcpu uses the=20
> vCPU thread's run_delay to determine steal time, causing an overflow.=20
> The issue was introduced by commit=20
> 917367aa968fd4fef29d340e0c7ec8c608dffaab.=20
>=20
> For the full analysis, see https://bugs.debian.org/785557#64 and the=20
> followup e-mail.=20

Adding Cc's...=20

Thanks,=20

/mjt=20