linux-kernel - Re: [RFC][PATCH] kvm: add suspend pm-notifier

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Date:   Fri, 4 Jun 2021 18:22:02 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Marc Zyngier <maz@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Paul Mackerras <paulus@...abs.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Suleiman Souhlal <suleiman@...gle.com>, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
        linux-s390@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [RFC][PATCH] kvm: add suspend pm-notifier

On (21/06/04 09:24), Paolo Bonzini wrote:
> On 04/06/21 09:21, Vitaly Kuznetsov wrote:
> > >   	preempt_notifier_inc();
> > > +	kvm_init_pm_notifier(kvm);
> > You've probably thought it through and I didn't but wouldn't it be
> > easier to have one global pm_notifier call for KVM which would go
> > through the list of VMs instead of registering/deregistering a
> > pm_notifier call for every created/destroyed VM?
> 
> That raises questions on the locking, i.e. if we can we take the kvm_lock
> safely from the notifier.

Right, I wanted to take the VM lock, rather than subsystem lock
(kvm_lock).