From: Dan Carpenter <dan.carpenter@oracle.com>
To: kbuild@lists.01.org, Maxim Levitsky <mlevitsk@redhat.com>,
kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
linux-kernel@vger.kernel.org, Joerg Roedel <joro@8bytes.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Ingo Molnar <mingo@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>
Subject: Re: [PATCH 3/3] KVM: nSVM: more strict SMM checks when returning to nested guest
Date: Mon, 31 Aug 2020 15:01:12 +0300 [thread overview]
Message-ID: <20200831120112.GH8299@kadam> (raw)
In-Reply-To: <20200827162720.278690-4-mlevitsk@redhat.com>
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Hi Maxim,
url: https://github.com/0day-ci/linux/commits/Maxim-Levitsky/Few-nSVM-bugfixes/20200828-003025
base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next
config: x86_64-randconfig-m001-20200827 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
smatch warnings:
arch/x86/kvm/svm/svm.c:3915 svm_pre_leave_smm() warn: should this be a bitwise op?
# https://github.com/0day-ci/linux/commit/e2317f8eb1f0e9f731ddbe66ab175be19f3bdaf1
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Maxim-Levitsky/Few-nSVM-bugfixes/20200828-003025
git checkout e2317f8eb1f0e9f731ddbe66ab175be19f3bdaf1
vim +3915 arch/x86/kvm/svm/svm.c
ed19321fb657121 arch/x86/kvm/svm.c Sean Christopherson 2019-04-02 3900 static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
0234bf885236a41 arch/x86/kvm/svm.c Ladi Prosek 2017-10-11 3901 {
05cade71cf3b925 arch/x86/kvm/svm.c Ladi Prosek 2017-10-11 3902 struct vcpu_svm *svm = to_svm(vcpu);
8c5fbf1a7231078 arch/x86/kvm/svm.c KarimAllah Ahmed 2019-01-31 3903 struct kvm_host_map map;
59cd9bc5b03f0ba arch/x86/kvm/svm/svm.c Vitaly Kuznetsov 2020-07-10 3904 int ret = 0;
05cade71cf3b925 arch/x86/kvm/svm.c Ladi Prosek 2017-10-11 3905
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3906 if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) {
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3907 u64 saved_efer = GET_SMSTATE(u64, smstate, 0x7ed0);
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3908 u64 guest = GET_SMSTATE(u64, smstate, 0x7ed8);
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3909 u64 vmcb = GET_SMSTATE(u64, smstate, 0x7ee0);
05cade71cf3b925 arch/x86/kvm/svm.c Ladi Prosek 2017-10-11 3910
ed19321fb657121 arch/x86/kvm/svm.c Sean Christopherson 2019-04-02 3911 if (guest) {
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3912 if (!guest_cpuid_has(vcpu, X86_FEATURE_SVM))
9ec19493fb86d6d arch/x86/kvm/svm.c Sean Christopherson 2019-04-02 3913 return 1;
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3914
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 @3915 if (!(saved_efer && EFER_SVME))
^^
It looks like bitwise AND was intended.
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3916 return 1;
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3917
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3918 if (kvm_vcpu_map(&svm->vcpu,
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3919 gpa_to_gfn(vmcb), &map) == -EINVAL)
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3920 return 1;
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3921
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3922 ret = enter_svm_guest_mode(svm, vmcb, map.hva);
69c9dfa24bb7bac arch/x86/kvm/svm/svm.c Paolo Bonzini 2020-05-13 3923 kvm_vcpu_unmap(&svm->vcpu, &map, true);
05cade71cf3b925 arch/x86/kvm/svm.c Ladi Prosek 2017-10-11 3924 }
e2317f8eb1f0e9f arch/x86/kvm/svm/svm.c Maxim Levitsky 2020-08-27 3925 }
59cd9bc5b03f0ba arch/x86/kvm/svm/svm.c Vitaly Kuznetsov 2020-07-10 3926
59cd9bc5b03f0ba arch/x86/kvm/svm/svm.c Vitaly Kuznetsov 2020-07-10 3927 return ret;
0234bf885236a41 arch/x86/kvm/svm.c Ladi Prosek 2017-10-11 3928 }
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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next prev parent reply other threads:[~2020-08-31 12:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-27 16:27 [PATCH 0/3] Few nSVM bugfixes Maxim Levitsky
2020-08-27 16:27 ` [PATCH 1/3] SVM: nSVM: correctly restore GIF on vmexit from nesting after migration Maxim Levitsky
2020-09-12 7:55 ` Paolo Bonzini
2020-08-27 16:27 ` [PATCH 2/3] SVM: nSVM: setup nested msr permission bitmap on nested state load Maxim Levitsky
2020-08-27 16:27 ` [PATCH 3/3] KVM: nSVM: more strict SMM checks when returning to nested guest Maxim Levitsky
2020-08-31 12:01 ` Dan Carpenter [this message]
2020-08-31 14:26 ` Maxim Levitsky
2020-09-12 16:32 ` [PATCH 0/3] Few nSVM bugfixes Paolo Bonzini
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