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From: Paolo Bonzini <pbonzini@redhat.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>,
	Igor Mammedov <imammedo@redhat.com>
Cc: kvm@vger.kernel.org, Sean Christopherson <seanjc@google.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] KVM: x86: Forbid KVM_SET_CPUID{,2} after KVM_RUN
Date: Fri, 7 Jan 2022 19:15:43 +0100	[thread overview]
Message-ID: <5505d731-cf87-9662-33f3-08844d92877c@redhat.com> (raw)
In-Reply-To: <877dbbq5om.fsf@redhat.com>

On 1/7/22 10:02, Vitaly Kuznetsov wrote:
> 
> I'm again leaning towards an allowlist and currently I see only two
> candidates:
> 
> CPUID.01H.EBX bits 31:24 (initial LAPIC id)
> CPUID.0BH.EDX (x2APIC id)
> 
> Anything else I'm missing?

I would also ignore completely CPUID leaves 03H, 04H, 0BH, 80000005h, 
80000006h, 8000001Dh, 8000001Eh (cache and processor topology), just to 
err on the safe side.

We could change kvm_find_cpuid_entry to WARN if any of those leaves are 
passed.

Paolo


  reply	other threads:[~2022-01-07 18:26 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-22 17:58 [PATCH 0/2] " Vitaly Kuznetsov
2021-11-22 17:58 ` [PATCH 1/2] KVM: selftests: Avoid KVM_SET_CPUID2 after KVM_RUN in hyperv_features test Vitaly Kuznetsov
2021-11-22 17:58 ` [PATCH 2/2] KVM: x86: Forbid KVM_SET_CPUID{,2} after KVM_RUN Vitaly Kuznetsov
2021-11-26 12:20   ` Paolo Bonzini
2021-12-27 17:32     ` Igor Mammedov
2022-01-02 17:31       ` Paolo Bonzini
2022-01-03  8:04         ` Vitaly Kuznetsov
2022-01-03  9:40           ` Igor Mammedov
2022-01-03 12:56             ` Vitaly Kuznetsov
2022-01-05  8:17               ` Igor Mammedov
2022-01-05  9:12                 ` Vitaly Kuznetsov
2022-01-05  9:10               ` Paolo Bonzini
2022-01-05 10:09                 ` Vitaly Kuznetsov
2022-01-07  9:02                   ` Vitaly Kuznetsov
2022-01-07 18:15                     ` Paolo Bonzini [this message]
2022-01-11  8:00                       ` Igor Mammedov
2022-01-12 13:58                         ` Vitaly Kuznetsov
2022-01-12 18:39                           ` Paolo Bonzini
2022-01-13  9:27                             ` Vitaly Kuznetsov
2022-01-13 14:28                               ` Maxim Levitsky
2022-01-13 14:36                                 ` Vitaly Kuznetsov
2022-01-13 14:41                                   ` Maxim Levitsky
2022-01-13 14:59                                     ` Vitaly Kuznetsov
2022-01-13 16:26                                       ` Sean Christopherson
2022-01-13 16:30                                         ` Maxim Levitsky
2022-01-13 22:33             ` Sean Christopherson
2022-01-14  8:28               ` Maxim Levitsky
2022-01-14 16:08                 ` Sean Christopherson
2022-01-14  8:55               ` Igor Mammedov
2022-01-14  9:31                 ` Vitaly Kuznetsov
2022-01-14 11:22                   ` Igor Mammedov
2022-01-14 12:25                     ` Vitaly Kuznetsov
2022-01-14 17:00                       ` Sean Christopherson
2022-01-17  9:55                         ` Vitaly Kuznetsov
2022-01-17 11:20                           ` Paolo Bonzini
2022-01-17 13:02                             ` Vitaly Kuznetsov

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