linux-kernel - Re: [RFC PATCH v2 21/69] KVM: Add max_vcpus field in common 'struct kvm'

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Message-ID: <YO34/91O242b8YS7@google.com>
Date:   Tue, 13 Jul 2021 20:35:11 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     isaku.yamahata@...el.com, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        isaku.yamahata@...il.com,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [RFC PATCH v2 21/69] KVM: Add max_vcpus field in common 'struct
 kvm'

On Tue, Jul 06, 2021, Paolo Bonzini wrote:
> Please replace "Add" with "Move" and add a couple lines to the commit
> message.

  Move arm's per-VM max_vcpus field into the generic "struct kvm", and use
  it to check vcpus_created in the generic code instead of checking only
  the hardcoded absolute KVM-wide max.  x86 TDX guests will reuse the
  generic check verbatim, as the max number of vCPUs for a TDX guest is
  user defined at VM creation and immutable thereafter.