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Message-ID: <40800163-2b28-9879-f21b-687f89070c91@redhat.com>
Date: Wed, 27 May 2020 18:17:57 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: Sean Christopherson <sean.j.christopherson@...el.com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org,
syzbot+904752567107eefb728c@...kaller.appspotmail.com
Subject: Re: [PATCH] KVM: x86: Initialize tdp_level during vCPU creation
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@...kaller.appspotmail.com
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.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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