linux-kernel - Re: [PATCH v6 13/21] KVM: s390: mechanism to enable guest zPCI Interpretation

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Message-ID: <02b06642-4bc4-e388-1dd7-6b28a85458c7@linux.ibm.com>
Date:   Thu, 5 May 2022 15:10:39 +0200
From:   Christian Borntraeger <borntraeger@...ux.ibm.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>, linux-s390@...r.kernel.org
Cc:     alex.williamson@...hat.com, cohuck@...hat.com,
        schnelle@...ux.ibm.com, farman@...ux.ibm.com, pmorel@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, frankja@...ux.ibm.com, david@...hat.com,
        imbrenda@...ux.ibm.com, vneethv@...ux.ibm.com,
        oberpar@...ux.ibm.com, freude@...ux.ibm.com, thuth@...hat.com,
        pasic@...ux.ibm.com, pbonzini@...hat.com, corbet@....net,
        jgg@...dia.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v6 13/21] KVM: s390: mechanism to enable guest zPCI
 Interpretation

Am 26.04.22 um 22:08 schrieb Matthew Rosato:

Reviewed-by: Christian Borntraeger <borntraeger@...ux.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);
> +}