linux-kernel - Re: [PATCH v8 8/9] KVM: x86: Allow userspace set maximum VCPU id for VM

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Date:   Fri, 15 Apr 2022 15:01:52 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Zeng Guang <guang.zeng@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Kim Phillips <kim.phillips@....com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Jethro Beekman <jethro@...tanix.com>,
        Kai Huang <kai.huang@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Robert Hu <robert.hu@...el.com>,
        Gao Chao <chao.gao@...el.com>
Subject: Re: [PATCH v8 8/9] KVM: x86: Allow userspace set maximum VCPU id for
 VM

On Mon, Apr 11, 2022, Zeng Guang wrote:
> @@ -11180,6 +11192,9 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
>  	struct page *page;
>  	int r;
>  
> +	if (vcpu->vcpu_id >= vcpu->kvm->arch.max_vcpu_ids)

This belongs in pre-create.

> +		return -EINVAL;
> +
>  	vcpu->arch.last_vmentry_cpu = -1;
>  	vcpu->arch.regs_avail = ~0;
>  	vcpu->arch.regs_dirty = ~0;