From: Marc Zyngier <maz@kernel.org>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>,
Eduardo Habkost <ehabkost@redhat.com>,
Andrew Jones <drjones@redhat.com>,
Huacai Chen <chenhuacai@kernel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
Anup Patel <anup.patel@wdc.com>,
Paul Mackerras <paulus@ozlabs.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Janosch Frank <frankja@linux.ibm.com>,
kvm-ppc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-mips@vger.kernel.org, kvm-riscv@lists.infradead.org,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/6] KVM: arm64: Cap KVM_CAP_NR_VCPUS by kvm_arm_default_max_vcpus()
Date: Wed, 17 Nov 2021 09:13:55 +0000 [thread overview]
Message-ID: <87zgq36t64.wl-maz@kernel.org> (raw)
In-Reply-To: <20211116163443.88707-2-vkuznets@redhat.com>
On Tue, 16 Nov 2021 16:34:38 +0000,
Vitaly Kuznetsov <vkuznets@redhat.com> wrote:
>
> Generally, it doesn't make sense to return the recommended maximum number
> of vCPUs which exceeds the maximum possible number of vCPUs.
>
> Note: ARM64 is special as the value returned by KVM_CAP_MAX_VCPUS differs
> depending on whether it is a system-wide ioctl or a per-VM one. Previously,
> KVM_CAP_NR_VCPUS didn't have this difference and it seems preferable to
> keep the status quo. Cap KVM_CAP_NR_VCPUS by kvm_arm_default_max_vcpus()
> which is what gets returned by system-wide KVM_CAP_MAX_VCPUS.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Acked-by: Marc Zyngier <maz@kernel.org>
M.
--
Without deviation from the norm, progress is not possible.
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next prev parent reply other threads:[~2021-11-17 9:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-16 16:34 [PATCH v2 0/6] KVM: Cap KVM_CAP_NR_VCPUS by KVM_CAP_MAX_VCPUS and re-purpose it on x86 Vitaly Kuznetsov
2021-11-16 16:34 ` [PATCH v2 1/6] KVM: arm64: Cap KVM_CAP_NR_VCPUS by kvm_arm_default_max_vcpus() Vitaly Kuznetsov
2021-11-17 9:13 ` Marc Zyngier [this message]
2021-11-17 12:07 ` Paolo Bonzini
2021-11-16 16:34 ` [PATCH v2 2/6] KVM: MIPS: Cap KVM_CAP_NR_VCPUS by KVM_CAP_MAX_VCPUS Vitaly Kuznetsov
2021-11-16 16:34 ` [PATCH v2 3/6] KVM: PPC: " Vitaly Kuznetsov
2021-11-16 16:34 ` [PATCH v2 4/6] KVM: RISC-V: " Vitaly Kuznetsov
2021-11-17 5:02 ` Anup Patel
2021-11-16 16:34 ` [PATCH v2 5/6] KVM: s390: Cap KVM_CAP_NR_VCPUS by num_online_cpus() Vitaly Kuznetsov
2021-11-17 7:33 ` Christian Borntraeger
2021-11-16 16:34 ` [PATCH v2 6/6] KVM: x86: Drop arbitraty KVM_SOFT_MAX_VCPUS Vitaly Kuznetsov
2021-11-17 12:12 ` Paolo Bonzini
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