linux-kernel - Re: [PATCH 3/5] selftests: KVM: Introduce vcpu_run

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Date:   Sun, 28 Aug 2022 19:21:58 +0000
From:   Mingwei Zhang <mizhang@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Oliver Upton <oupton@...gle.com>
Subject: Re: [PATCH 3/5] selftests: KVM: Introduce vcpu_run_interruptable()

On Thu, Aug 25, 2022, Sean Christopherson wrote:
> On Tue, Aug 02, 2022, Mingwei Zhang wrote:
> > Introduce vcpu_run_interruptable() to allow selftests execute their own
> > code when a vcpu is kicked out of KVM_RUN on receiving a POSIX signal.
> 
> But that's what __vcpu_run() is for.  Clearing "immediate_exit" after KVM_RUN does
> not scream "interruptible" to me.
> 
> There's only one user after this series, just clear vcpu->run->immediate_exit
> manually in that test (a comment on _why_ it's cleared would be helpful).
> 
hmm. good point. __vcpu_run() I thought it was internal function private
to kvm_util.c, but now after your selftest refactoring, this is useable.
Will use __vcpu_run() instead.

> > +int vcpu_run_interruptable(struct kvm_vcpu *vcpu)
> > +{
> > +	int rc;
> > +
> > +	rc = __vcpu_run(vcpu);
> > +
> > +	vcpu->run->immediate_exit = 0;
> > +
> > +	return rc;
> > +}
> > +
> >  int _vcpu_run(struct kvm_vcpu *vcpu)
> >  {
> >  	int rc;
> > -- 
> > 2.37.1.455.g008518b4e5-goog
> >