[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH 1/6] target-arm: kvm: save/restore mp state
|
From: |
Paolo Bonzini |
|
Subject: |
Re: [Qemu-devel] [PATCH 1/6] target-arm: kvm: save/restore mp state |
|
Date: |
Tue, 03 Mar 2015 12:06:40 +0100 |
|
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 |
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