# Re: \[PATCH v2 1/6\] KVM: arm64: Cap KVM\_CAP\_NR\_VCPUS by kvm\_arm\_default\_max\_vcpus()

- From: Marc Zyngier \<maz@kernel.org\>
- Date: 2021-11-17 09:14:07 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/11/1577256
- Thread: https://ratatoskr.run/kvm/2021/11/1576596/t.md

```text
On Tue, 16 Nov 2021 16:34:38 +0000,
Vitaly Kuznetsov [ref] 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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