From: Paolo Bonzini <pbonzini@redhat.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
syzbot+904752567107eefb728c@syzkaller.appspotmail.com
Subject: Re: [PATCH] KVM: x86: Initialize tdp_level during vCPU creation
Date: Wed, 27 May 2020 18:17:57 +0200 [thread overview]
Message-ID: <40800163-2b28-9879-f21b-687f89070c91@redhat.com> (raw)
In-Reply-To: <20200527085400.23759-1-sean.j.christopherson@intel.com>
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
next prev parent reply other threads:[~2020-05-27 16:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-27 8:54 [PATCH] KVM: x86: Initialize tdp_level during vCPU creation Sean Christopherson
2020-05-27 10:03 ` Vitaly Kuznetsov
2020-05-27 16:15 ` Paolo Bonzini
2020-05-27 16:23 ` Sean Christopherson
2020-05-27 16:56 ` Paolo Bonzini
2020-05-28 2:27 ` Sean Christopherson
2020-05-27 16:17 ` Paolo Bonzini [this message]
2020-05-27 16:29 ` Sean Christopherson
2020-05-27 16:56 ` Paolo Bonzini
2020-05-27 17:06 ` Sean Christopherson
2020-05-28 19:46 ` Sean Christopherson
2020-05-29 7:46 ` Vitaly Kuznetsov
2020-05-29 13:06 ` Sean Christopherson
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