linux-kernel - Re: [PATCH v3 1/8] KVM: X86: Reset vcpu->arch.cpuid_nent to 0 if SET

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <fe0c23e6-491b-358b-8e94-94fb01cb3890@redhat.com>
Date:   Wed, 8 Jul 2020 14:00:50 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Xiaoyao Li <xiaoyao.li@...el.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Jim Mattson <jmattson@...gle.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v3 1/8] KVM: X86: Reset vcpu->arch.cpuid_nent to 0 if
 SET_CPUID* fails

On 08/07/20 08:50, Xiaoyao Li wrote:
> +Note, when this IOCTL fails, KVM gives no guarantees that previous valid CPUID
> +configuration (if there is) is not corrupted. Userspace can get a copy of valid
> +CPUID configuration through KVM_GET_CPUID2 in case.
> +
>  ::

I assume you mean "of the resulting CPUID configuration".

Paolo