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Date:   Tue, 12 Jan 2021 09:06:07 +0100
From:   Paolo Bonzini <>
To:     Sean Christopherson <>,
        Jim Mattson <>
Cc:     syzbot <>,
        Borislav Petkov <>,
        "H . Peter Anvin" <>, Joerg Roedel <>,
        kvm list <>,
        LKML <>,
        Ingo Molnar <>,
        syzkaller-bugs <>,
        Thomas Gleixner <>,
        Vitaly Kuznetsov <>,
        Wanpeng Li <>,
        the arch/x86 maintainers <>
Subject: Re: UBSAN: shift-out-of-bounds in kvm_vcpu_after_set_cpuid

On 12/01/21 00:01, Sean Christopherson wrote:
>> Perhaps cpuid_query_maxphyaddr() should just look at the low 5 bits of
>> CPUID.80000008H:EAX?

The low 6 bits I guess---yes, that would make sense and it would have 
also fixed the bug.

(Nevertheless it's a good idea to make rsvd_bits more robust as well, as 
in the commit that Sean referenced.


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