linux-kernel - Re: [PATCH 1/4 V8] KVM: SEV: Add support for SEV intra host migration

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Date:   Tue, 28 Sep 2021 14:42:19 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Peter Gonda <pgonda@...gle.com>
Cc:     kvm@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>,
        Marc Orr <marcorr@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4 V8] KVM: SEV: Add support for SEV intra host migration

On Tue, Sep 14, 2021 at 09:47:24AM -0700, Peter Gonda wrote:
> +static int sev_lock_vcpus_for_migration(struct kvm *kvm)
> +{
> +	struct kvm_vcpu *vcpu;
> +	int i, j;
> +
> +	kvm_for_each_vcpu(i, vcpu, kvm) {
> +		if (mutex_lock_killable(&vcpu->mutex))
> +			goto out_unlock;
> +	}
> +
> +	return 0;
> +
> +out_unlock:
> +	kvm_for_each_vcpu(j, vcpu, kvm) {
> +		mutex_unlock(&vcpu->mutex);
> +		if (i == j)
> +			break;

Hmm, doesn't the mutex_unlock() need to happen after the check?