From: Gleb Natapov <gleb@redhat.com>
To: Alexander Graf <agraf@suse.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
kvm@vger.kernel.org, kvm-ppc@vger.kernel.org,
Stuart Yoder <stuart.yoder@freescale.com>,
Scott Wood <scottwood@freescale.com>,
Paul Mackerras <paulus@samba.org>,
Peter Maydell <peter.maydell@linaro.org>
Subject: Re: in-kernel interrupt controller steering
Date: Wed, 6 Mar 2013 15:16:14 +0200 [thread overview]
Message-ID: <20130306131614.GS11223@redhat.com> (raw)
In-Reply-To: <20563F35-046C-432C-9F7A-0CEF38180964@suse.de>
On Wed, Mar 06, 2013 at 12:58:39PM +0100, Alexander Graf wrote:
>
> On 06.03.2013, at 12:57, Paolo Bonzini wrote:
>
> >>> I agree. But is the device really being created at CREATE_DEVICE
> >>> time? What happens if you create N CPUs and N-1 irqchips?
> >>
> >> irqchip in CREATE_DEVICE is the IOAPIC, not the LAPIC. The LAPIC gets
> >> spawned at vcpu creation.
> >>
> >>> On x86, the LAPIC is created magically together with the VCPU.
> >>
> >> Yes, and so far I haven't seen any proposal to change this even in
> >> the CREATE_DEVICE world.
> >
> > But don't you need anyway an id to get/set the device properties of
> > the per-VCPU irqchip? If you were adding the x86 irqchip with the
> > new API, what would be the replacement of KVM_GET_LAPIC/KVM_SET_LAPIC?
>
> In the current model, that would be ONE_REG registers on the vcpus.
>
Yes, the same way as KVM_GET_LAPIC is per cpu ioctl. No need for special
ID.
--
Gleb.
next prev parent reply other threads:[~2013-03-06 13:16 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-04 22:20 in-kernel interrupt controller steering Alexander Graf
2013-03-05 0:59 ` Scott Wood
2013-03-05 5:44 ` Paul Mackerras
2013-03-05 15:25 ` Gleb Natapov
2013-03-06 9:40 ` Paolo Bonzini
2013-03-06 9:58 ` Gleb Natapov
2013-03-06 10:04 ` Alexander Graf
2013-03-06 10:12 ` Gleb Natapov
2013-03-06 10:38 ` Paolo Bonzini
2013-03-06 10:38 ` Paolo Bonzini
2013-03-06 11:26 ` Gleb Natapov
2013-03-06 11:44 ` Alexander Graf
2013-03-06 11:46 ` Paolo Bonzini
2013-03-06 11:47 ` Alexander Graf
2013-03-06 11:57 ` Paolo Bonzini
2013-03-06 11:58 ` Alexander Graf
2013-03-06 13:16 ` Gleb Natapov [this message]
2013-03-06 11:44 ` Paolo Bonzini
2013-03-06 11:46 ` Alexander Graf
2013-03-06 11:59 ` Gleb Natapov
2013-03-06 12:02 ` Alexander Graf
2013-03-06 12:14 ` Paolo Bonzini
2013-03-06 12:20 ` Alexander Graf
2013-03-06 12:28 ` Paolo Bonzini
2013-03-06 13:14 ` Gleb Natapov
2013-03-06 13:22 ` Alexander Graf
2013-03-06 13:56 ` Gleb Natapov
2013-03-06 14:03 ` Alexander Graf
2013-03-06 14:12 ` Paolo Bonzini
2013-03-06 14:30 ` Alexander Graf
2013-03-06 14:37 ` Paolo Bonzini
2013-03-06 14:40 ` Alexander Graf
2013-03-06 14:41 ` Gleb Natapov
2013-03-06 14:48 ` Alexander Graf
2013-03-06 14:59 ` Alexander Graf
2013-03-06 15:02 ` Paolo Bonzini
2013-03-06 15:30 ` Gleb Natapov
2013-03-06 16:33 ` Alexander Graf
2013-03-07 0:32 ` Paul Mackerras
2013-03-07 7:43 ` Paolo Bonzini
2013-03-06 13:41 ` Paolo Bonzini
2013-03-06 14:11 ` Gleb Natapov
2013-03-06 14:31 ` Alexander Graf
2013-03-06 18:46 ` Peter Maydell
2013-03-06 19:20 ` Alexander Graf
2013-03-06 0:23 ` Benjamin Herrenschmidt
2013-03-06 0:33 ` Alexander Graf
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