linux-kernel - Re: [RFC PATCH v11 16/29] KVM: Allow arch code to track number of memslot address spaces per VM

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Date:   Fri, 21 Jul 2023 17:12:51 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Huacai Chen <chenhuacai@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paul Moore <paul@...l-moore.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>
Cc:     kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.linux.dev, linux-mips@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        Fuad Tabba <tabba@...gle.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Ackerley Tng <ackerleytng@...gle.com>,
        Maciej Szmigiero <mail@...iej.szmigiero.name>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Hildenbrand <david@...hat.com>,
        Quentin Perret <qperret@...gle.com>,
        Michael Roth <michael.roth@....com>,
        Wang <wei.w.wang@...el.com>,
        Liam Merwick <liam.merwick@...cle.com>,
        Isaku Yamahata <isaku.yamahata@...il.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [RFC PATCH v11 16/29] KVM: Allow arch code to track number of
 memslot address spaces per VM

On 7/19/23 01:44, Sean Christopherson wrote:
> @@ -4725,9 +4725,9 @@ static int kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
>   	case KVM_CAP_IRQ_ROUTING:
>   		return KVM_MAX_IRQ_ROUTES;
>   #endif
> -#if KVM_ADDRESS_SPACE_NUM > 1
> +#if KVM_MAX_NR_ADDRESS_SPACES > 1
>   	case KVM_CAP_MULTI_ADDRESS_SPACE:
> -		return KVM_ADDRESS_SPACE_NUM;
> +		return KVM_MAX_NR_ADDRESS_SPACES;
>   #endif

Since this is a VM ioctl, it should return 
kvm_arch_nr_memslot_as_ids(kvm) if kvm != NULL.

Paolo