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    SubjectRe: [PATCH] KVM: x86: Initialize tdp_level during vCPU creation
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    On 27/05/20 10:54, Sean Christopherson wrote:
    > Initialize vcpu->arch.tdp_level during vCPU creation to avoid consuming
    > garbage if userspace calls KVM_RUN without first calling KVM_SET_CPUID.
    >
    > Fixes: e93fd3b3e89e9 ("KVM: x86/mmu: Capture TDP level when updating CPUID")
    > Reported-by: syzbot+904752567107eefb728c@syzkaller.appspotmail.com
    > Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
    > ---
    > arch/x86/kvm/x86.c | 1 +
    > 1 file changed, 1 insertion(+)
    >
    > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
    > index b226fb8abe41b..01a6304056197 100644
    > --- a/arch/x86/kvm/x86.c
    > +++ b/arch/x86/kvm/x86.c
    > @@ -9414,6 +9414,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
    > fx_init(vcpu);
    >
    > vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
    > + vcpu->arch.tdp_level = kvm_x86_ops.get_tdp_level(vcpu);
    >
    > vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT;

    Queued, it is probably a good idea to add a selftests testcase for this
    (it's even okay if it doesn't use the whole selftests infrastructure and
    invokes KVM_CREATE_VM/KVM_CREATE_VCPU/KVM_RUN manually).

    Paolo

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