From: Paolo Bonzini <pbonzini@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
Gleb Natapov <gleb@minantech.com>, KVM <kvm@vger.kernel.org>,
linux-s390 <linux-s390@vger.kernel.org>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Jens Freimann <jfrei@linux.vnet.ibm.com>,
agraf@suse.de
Subject: Re: [PATCHv3] kvm/irqchip: Speed up KVM_SET_GSI_ROUTING
Date: Fri, 17 Jan 2014 16:26:56 +0100 [thread overview]
Message-ID: <52D94BC0.9010803@redhat.com> (raw)
In-Reply-To: <52D94637.8090602@de.ibm.com>
Il 17/01/2014 16:03, Christian Borntraeger ha scritto:
> > Well... I love to contradict myself, so: no way this can be accepted
> > this close to the end of the merge window. :(
> >
> > synchronize_rcu_expedited() forces a context switch on all CPUs, even
> > those that are not running KVM. Thus, this patch might help a guest DoS
> > its host by changing the IRQ routing tables in a loop.
> >
> > So this will have to wait for 3.15. We have ~2 months to do performance
> > measurements on the v2 patch. Sorry.
>
> Any chance that you or Michael can give some performance feedback on v2? All
> my lab systems are s390 and not x86...
Yes, we will help.
Paolo
next prev parent reply other threads:[~2014-01-17 15:26 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-16 9:23 [PATCH] kvm/irqchip: Speed up KVM_SET_GSI_ROUTING Christian Borntraeger
2014-01-16 11:24 ` Paolo Bonzini
2014-01-16 12:44 ` [PATCHv2/RFC] " Christian Borntraeger
2014-01-16 12:59 ` Paolo Bonzini
2014-01-16 13:06 ` Christian Borntraeger
2014-01-16 13:07 ` Paolo Bonzini
2014-01-16 18:56 ` Michael S. Tsirkin
2014-01-17 8:29 ` Christian Borntraeger
2014-01-17 9:19 ` Paolo Bonzini
2014-02-19 22:23 ` Paolo Bonzini
2014-02-21 4:59 ` Andrew Theurer
2014-01-16 18:55 ` Michael S. Tsirkin
2014-01-16 20:07 ` [PATCHv3] " Christian Borntraeger
2014-01-16 20:22 ` Michael S. Tsirkin
2014-01-17 14:03 ` Paolo Bonzini
2014-01-17 15:03 ` Christian Borntraeger
2014-01-17 15:26 ` Paolo Bonzini [this message]
2014-02-21 17:35 ` [PATCHv2/RFC] " Paolo Bonzini
2014-02-24 11:58 ` [PATCHv2] " Christian Borntraeger
2014-02-24 12:02 ` Paolo Bonzini
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