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Date:   Thu, 5 May 2022 15:10:39 +0200
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Subject: Re: [PATCH v6 13/21] KVM: s390: mechanism to enable guest zPCI
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To:     Matthew Rosato <mjrosato@linux.ibm.com>, linux-s390@vger.kernel.org
Cc:     alex.williamson@redhat.com, cohuck@redhat.com,
        schnelle@linux.ibm.com, farman@linux.ibm.com, pmorel@linux.ibm.com,
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        svens@linux.ibm.com, frankja@linux.ibm.com, david@redhat.com,
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        jgg@nvidia.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
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References: <20220426200842.98655-1-mjrosato@linux.ibm.com>
 <20220426200842.98655-14-mjrosato@linux.ibm.com>
From:   Christian Borntraeger <borntraeger@linux.ibm.com>
In-Reply-To: <20220426200842.98655-14-mjrosato@linux.ibm.com>
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Am 26.04.22 um 22:08 schrieb Matthew Rosato:

Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>


> +/* Must be called with kvm->lock held */

maybe lockdep_assert_held?

> +void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm)
> +{
> +	struct kvm_vcpu *vcpu;
> +	unsigned long i;
> +
> +	/*
> +	 * If host is configured for PCI and the necessary facilities are
> +	 * available, turn on interpretation for the life of this guest
> +	 */
> +	if (!kvm_s390_pci_interp_allowed())
> +		return;
> +
> +	kvm->arch.use_zpci_interp = 1;
> +
> +	kvm_s390_vcpu_block_all(kvm);
> +
> +	kvm_for_each_vcpu(i, vcpu, kvm) {
> +		kvm_s390_vcpu_pci_setup(vcpu);
> +		kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
> +	}
> +
> +	kvm_s390_vcpu_unblock_all(kvm);
> +}