Sender: Paolo Bonzini <paolo.bonzini@gmail.com>
Message-ID: <edd15117-def0-71b6-6422-66490155448d@redhat.com>
Date:   Tue, 23 Nov 2021 09:51:53 +0100
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Subject: Re: [RFC v2 PATCH 13/13] KVM: Enable memfd based page
 invalidation/fallocate
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To:     Chao Peng <chao.p.peng@linux.intel.com>, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        linux-fsdevel@vger.kernel.org, qemu-devel@nongnu.org
Cc:     Jonathan Corbet <corbet@lwn.net>,
        Sean Christopherson <seanjc@google.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
        Hugh Dickins <hughd@google.com>,
        Jeff Layton <jlayton@kernel.org>,
        "J . Bruce Fields" <bfields@fieldses.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Yu Zhang <yu.c.zhang@linux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
        luto@kernel.org, john.ji@intel.com, susie.li@intel.com,
        jun.nakajima@intel.com, dave.hansen@intel.com, ak@linux.intel.com,
        david@redhat.com
References: <20211119134739.20218-1-chao.p.peng@linux.intel.com>
 <20211119134739.20218-14-chao.p.peng@linux.intel.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
In-Reply-To: <20211119134739.20218-14-chao.p.peng@linux.intel.com>
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On 11/19/21 14:47, Chao Peng wrote:
> +	list_for_each_entry(kvm, &vm_list, vm_list) {
> +		if (kvm == vm)
> +			return false;
> +	}
> +
> +	return true;

This would have to take the kvm_lock, but see my reply to patch 1.

Paolo