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Message-ID: <99cea0ba-9791-45dc-8c78-04d724a11cf4@oracle.com>
Date: Mon, 21 Nov 2022 16:34:47 +0000
From: Liam Merwick <liam.merwick@...cle.com>
To: Maxim Levitsky <mlevitsk@...hat.com>, kvm@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org,
Chenyi Qiang <chenyi.qiang@...el.com>,
Yang Zhong <yang.zhong@...el.com>, x86@...nel.org,
Shuah Khan <shuah@...nel.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>,
Colton Lewis <coltonlewis@...gle.com>,
Borislav Petkov <bp@...en8.de>, Peter Xu <peterx@...hat.com>,
Sean Christopherson <seanjc@...gle.com>,
Jim Mattson <jmattson@...gle.com>,
linux-kselftest@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
Wei Wang <wei.w.wang@...el.com>,
David Matlack <dmatlack@...gle.com>, stable@...r.kernel.org,
Liam Merwick <liam.merwick@...cle.com>
Subject: Re: [PATCH v2 9/9] KVM: x86: remove exit_int_info warning in
svm_handle_exit
On 09/11/2022 09:15, Maxim Levitsky wrote:
> 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@...r.kernel.org
>>> Signed-off-by: Maxim Levitsky <mlevitsk@...hat.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.
>
Reviewed-by: Liam Merwick <liam.merwick@...cle.com>
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