From: Maxim Levitsky <mlevitsk@redhat.com>
To: Liam Merwick <liam.merwick@oracle.com>, kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org,
Chenyi Qiang <chenyi.qiang@intel.com>,
Yang Zhong <yang.zhong@intel.com>,
x86@kernel.org, Shuah Khan <shuah@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Colton Lewis <coltonlewis@google.com>,
Borislav Petkov <bp@alien8.de>, Peter Xu <peterx@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Jim Mattson <jmattson@google.com>,
linux-kselftest@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Wei Wang <wei.w.wang@intel.com>,
David Matlack <dmatlack@google.com>,
stable@vger.kernel.org
Subject: Re: [PATCH v2 9/9] KVM: x86: remove exit_int_info warning in svm_handle_exit
Date: Wed, 09 Nov 2022 11:15:16 +0200 [thread overview]
Message-ID: <30b8e07970f2cfbba0ebee82aa3b46a047a0f43b.camel@redhat.com> (raw)
In-Reply-To: <3d25a0b4-6957-d070-db11-69ec9e0132ba@oracle.com>
On Sun, 2022-11-06 at 15:53 +0000, Liam Merwick wrote:
> On 03/11/2022 14:13, Maxim Levitsky wrote:
> > It is valid to receive external interrupt and have broken IDT entry,
> > which will lead to #GP with exit_int_into that will contain the index of
> > the IDT entry (e.g any value).
> >
> > Other exceptions can happen as well, like #NP or #SS
> > (if stack switch fails).
> >
> > Thus this warning can be user triggred and has very little value.
> >
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
> > ---
> > arch/x86/kvm/svm/svm.c | 9 ---------
> > 1 file changed, 9 deletions(-)
> >
> > diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> > index e9cec1b692051c..36f651ce842174 100644
> > --- a/arch/x86/kvm/svm/svm.c
> > +++ b/arch/x86/kvm/svm/svm.c
> > @@ -3428,15 +3428,6 @@ static int svm_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
> > return 0;
> > }
> >
> > - if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
> > - exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
> > - exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH &&
> > - exit_code != SVM_EXIT_INTR && exit_code != SVM_EXIT_NMI)
> > - printk(KERN_ERR "%s: unexpected exit_int_info 0x%x "
> > - "exit_code 0x%x\n",
> > - __func__, svm->vmcb->control.exit_int_info,
> > - exit_code);
> > -
> > if (exit_fastpath != EXIT_FASTPATH_NONE)
> > return 1;
> >
>
> This was the only caller of is_external_interrupt() - should the
> definition be removed also to avoid a 'defined but not used' warning?
I hate to say it but I have seen a warning about an unused function,
but I really didn't expect that to come from this patch.
I somehow thought that its some leftover in kvm/queue.
I'll remove the unused function in a next version.
Best regards,
Maxim Levitsky
>
> Regards,
> Liam
>
next prev parent reply other threads:[~2022-11-09 9:17 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-03 14:13 [PATCH v2 0/9] nSVM: Security and correctness fixes Maxim Levitsky
2022-11-03 14:13 ` [PATCH v2 1/9] KVM: x86: nSVM: leave nested mode on vCPU free Maxim Levitsky
2022-11-21 16:30 ` Liam Merwick
2022-11-03 14:13 ` [PATCH v2 2/9] KVM: x86: nSVM: harden svm_free_nested against freeing vmcb02 while still in use Maxim Levitsky
2022-11-21 16:30 ` Liam Merwick
2022-11-03 14:13 ` [PATCH v2 3/9] KVM: x86: add kvm_leave_nested Maxim Levitsky
2022-11-21 16:31 ` Liam Merwick
2022-11-03 14:13 ` [PATCH v2 4/9] KVM: x86: forcibly leave nested mode on vCPU reset Maxim Levitsky
2022-11-21 16:31 ` Liam Merwick
2022-11-03 14:13 ` [PATCH v2 5/9] KVM: selftests: move idt_entry to header Maxim Levitsky
2022-11-21 16:32 ` Liam Merwick
2022-11-03 14:13 ` [PATCH v2 6/9] kvm: selftests: add svm nested shutdown test Maxim Levitsky
2022-11-03 14:28 ` Maxim Levitsky
2022-11-21 16:33 ` Liam Merwick
2022-11-03 14:13 ` [PATCH v2 7/9] KVM: x86: allow L1 to not intercept triple fault Maxim Levitsky
2022-11-21 16:33 ` Liam Merwick
2022-11-03 14:13 ` [PATCH v2 8/9] KVM: selftests: add svm part to triple_fault_test Maxim Levitsky
2022-11-21 16:34 ` Liam Merwick
2022-11-03 14:13 ` [PATCH v2 9/9] KVM: x86: remove exit_int_info warning in svm_handle_exit Maxim Levitsky
2022-11-06 15:53 ` Liam Merwick
2022-11-09 9:15 ` Maxim Levitsky [this message]
2022-11-21 16:34 ` Liam Merwick
2022-11-15 14:55 ` [PATCH v2 0/9] nSVM: Security and correctness fixes Maxim Levitsky
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