From: Paolo Bonzini <pbonzini@redhat.com>
To: "Alex Bennée" <alex.bennee@linaro.org>,
"Peter Maydell" <peter.maydell@linaro.org>
Cc: kvm-devel <kvm@vger.kernel.org>,
Marc Zyngier <marc.zyngier@arm.com>,
QEMU Developers <qemu-devel@nongnu.org>,
"kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
arm-mail-list <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 1/6] target-arm: kvm: save/restore mp state
Date: Tue, 03 Mar 2015 12:06:40 +0100 [thread overview]
Message-ID: <54F595C0.5060004@redhat.com> (raw)
In-Reply-To: <8761ai73j1.fsf@linaro.org>
On 03/03/2015 11:56, Alex Bennée wrote:
> > > This adds the saving and restore of the current Multi-Processing state
> > > of the machine. While the KVM_GET/SET_MP_STATE API exposes a number of
> > > potential states for x86 we only use two for ARM. Either the process is
> > > running or not.
> >
> > By this you mean "is the CPU in the PSCI powered down state or not",
> > right?
>
> From the vcpu's perspective it is either running or not. However it is
> the same mechanism that is used when PSCI_0_2_FN_CPU_OFF is passed the
> VM, internally setting vcpu->arch.paused.
I suggest that you define a new MP_STATE constant for this. HALTED in
x86 and s390 is the state an ARM processor enters when you execute wfi.
Right now this is not migrated on ARM if I remember correctly, but
perhaps you'll want to add it in the future.
Paolo
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WARNING: multiple messages have this Message-ID (diff)
From: pbonzini@redhat.com (Paolo Bonzini)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/6] target-arm: kvm: save/restore mp state
Date: Tue, 03 Mar 2015 12:06:40 +0100 [thread overview]
Message-ID: <54F595C0.5060004@redhat.com> (raw)
In-Reply-To: <8761ai73j1.fsf@linaro.org>
On 03/03/2015 11:56, Alex Benn?e wrote:
> > > This adds the saving and restore of the current Multi-Processing state
> > > of the machine. While the KVM_GET/SET_MP_STATE API exposes a number of
> > > potential states for x86 we only use two for ARM. Either the process is
> > > running or not.
> >
> > By this you mean "is the CPU in the PSCI powered down state or not",
> > right?
>
> From the vcpu's perspective it is either running or not. However it is
> the same mechanism that is used when PSCI_0_2_FN_CPU_OFF is passed the
> VM, internally setting vcpu->arch.paused.
I suggest that you define a new MP_STATE constant for this. HALTED in
x86 and s390 is the state an ARM processor enters when you execute wfi.
Right now this is not migrated on ARM if I remember correctly, but
perhaps you'll want to add it in the future.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: "Alex Bennée" <alex.bennee@linaro.org>,
"Peter Maydell" <peter.maydell@linaro.org>
Cc: kvm-devel <kvm@vger.kernel.org>,
Marc Zyngier <marc.zyngier@arm.com>,
QEMU Developers <qemu-devel@nongnu.org>,
Christoffer Dall <christoffer.dall@linaro.org>,
"kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
arm-mail-list <linux-arm-kernel@lists.infradead.org>
Subject: Re: [Qemu-devel] [PATCH 1/6] target-arm: kvm: save/restore mp state
Date: Tue, 03 Mar 2015 12:06:40 +0100 [thread overview]
Message-ID: <54F595C0.5060004@redhat.com> (raw)
In-Reply-To: <8761ai73j1.fsf@linaro.org>
On 03/03/2015 11:56, Alex Bennée wrote:
> > > This adds the saving and restore of the current Multi-Processing state
> > > of the machine. While the KVM_GET/SET_MP_STATE API exposes a number of
> > > potential states for x86 we only use two for ARM. Either the process is
> > > running or not.
> >
> > By this you mean "is the CPU in the PSCI powered down state or not",
> > right?
>
> From the vcpu's perspective it is either running or not. However it is
> the same mechanism that is used when PSCI_0_2_FN_CPU_OFF is passed the
> VM, internally setting vcpu->arch.paused.
I suggest that you define a new MP_STATE constant for this. HALTED in
x86 and s390 is the state an ARM processor enters when you execute wfi.
Right now this is not migrated on ARM if I remember correctly, but
perhaps you'll want to add it in the future.
Paolo
next prev parent reply other threads:[~2015-03-03 11:00 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-25 16:02 [PATCH 0/6] QEMU ARM64 Migration Fixes Alex Bennée
2015-02-25 16:02 ` [Qemu-devel] " Alex Bennée
2015-02-25 16:02 ` Alex Bennée
2015-02-25 16:02 ` [PATCH 1/6] target-arm: kvm: save/restore mp state Alex Bennée
2015-02-25 16:02 ` [Qemu-devel] " Alex Bennée
2015-02-25 16:02 ` Alex Bennée
2015-02-25 23:36 ` Peter Maydell
2015-02-25 23:36 ` [Qemu-devel] " Peter Maydell
2015-02-25 23:36 ` Peter Maydell
2015-03-03 10:56 ` Alex Bennée
2015-03-03 10:56 ` [Qemu-devel] " Alex Bennée
2015-03-03 10:56 ` Alex Bennée
2015-03-03 11:06 ` Paolo Bonzini [this message]
2015-03-03 11:06 ` [Qemu-devel] " Paolo Bonzini
2015-03-03 11:06 ` Paolo Bonzini
2015-03-03 11:51 ` Peter Maydell
2015-03-03 11:51 ` [Qemu-devel] " Peter Maydell
2015-03-03 11:51 ` Peter Maydell
2015-03-03 16:30 ` Alex Bennée
2015-03-03 16:30 ` [Qemu-devel] " Alex Bennée
2015-03-03 16:30 ` Alex Bennée
2015-03-03 17:10 ` Paolo Bonzini
2015-03-03 17:10 ` [Qemu-devel] " Paolo Bonzini
2015-03-03 17:10 ` Paolo Bonzini
2015-02-26 12:57 ` Paolo Bonzini
2015-02-26 12:57 ` [Qemu-devel] " Paolo Bonzini
2015-02-26 12:57 ` Paolo Bonzini
2015-02-25 16:02 ` [PATCH 2/6] arm_gic_kvm.c: restore config before pending IRQs Alex Bennée
2015-02-25 16:02 ` [Qemu-devel] " Alex Bennée
2015-02-25 16:02 ` Alex Bennée
2015-03-02 22:14 ` Christoffer Dall
2015-03-02 22:14 ` [Qemu-devel] " Christoffer Dall
2015-03-02 22:14 ` Christoffer Dall
2015-02-25 16:02 ` [PATCH 3/6] hw/char/pl011: don't keep setting the IRQ if nothing changed Alex Bennée
2015-02-25 16:02 ` [Qemu-devel] " Alex Bennée
2015-02-25 16:02 ` Alex Bennée
2015-02-25 16:02 ` [PATCH 4/6] target-arm/kvm64.c: sync FP register state Alex Bennée
2015-02-25 16:02 ` [Qemu-devel] " Alex Bennée
2015-02-25 16:02 ` Alex Bennée
2015-02-25 16:02 ` [PATCH 5/6] target-arm/kvm64: fix save/restore of SPSR registers Alex Bennée
2015-02-25 16:02 ` [Qemu-devel] " Alex Bennée
2015-02-25 16:02 ` Alex Bennée
2015-02-25 16:02 ` [PATCH 5/6] target-arm/kvm64: fix save/restore of SPSR regs Alex Bennée
2015-02-25 16:02 ` [Qemu-devel] " Alex Bennée
2015-02-25 16:02 ` Alex Bennée
2015-03-02 17:22 ` Christoffer Dall
2015-03-02 17:22 ` [Qemu-devel] " Christoffer Dall
2015-03-02 17:22 ` Christoffer Dall
2015-03-03 11:28 ` Alex Bennée
2015-03-03 11:28 ` [Qemu-devel] " Alex Bennée
2015-03-03 11:28 ` Alex Bennée
2015-03-09 12:56 ` Christoffer Dall
2015-03-09 12:56 ` [Qemu-devel] " Christoffer Dall
2015-03-09 12:56 ` Christoffer Dall
2015-03-09 13:31 ` Peter Maydell
2015-03-09 13:31 ` [Qemu-devel] " Peter Maydell
2015-03-09 13:31 ` Peter Maydell
2015-03-09 16:25 ` Alex Bennée
2015-03-09 16:25 ` [Qemu-devel] " Alex Bennée
2015-03-09 16:25 ` Alex Bennée
2015-03-09 16:25 ` Alex Bennée
2015-03-09 19:31 ` Christoffer Dall
2015-03-09 19:31 ` [Qemu-devel] " Christoffer Dall
2015-03-09 19:31 ` Christoffer Dall
2015-02-25 16:02 ` [PATCH 6/6] target-arm/cpu.h: document why env->spsr exists Alex Bennée
2015-02-25 16:02 ` [Qemu-devel] " Alex Bennée
2015-02-25 16:02 ` Alex Bennée
2015-03-11 15:39 ` [Qemu-devel] " Greg Bellows
2015-03-11 15:39 ` Greg Bellows
2015-03-11 15:39 ` Greg Bellows
2015-03-11 15:47 ` Peter Maydell
2015-03-11 15:47 ` [Qemu-devel] " Peter Maydell
2015-03-11 15:47 ` Peter Maydell
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