linux-kernel - Re: [PATCH] KVM: x86: don't notify userspace IOAPIC on edge-triggered interrupt EOI

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Message-ID: <69ed7230e1ec45f39c66f516d23af313@huawei.com>
Date:   Wed, 19 Feb 2020 01:39:35 +0000
From:   linmiaohe <linmiaohe@...wei.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
        "wanpengli@...cent.com" <wanpengli@...cent.com>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>
Subject: Re: [PATCH] KVM: x86: don't notify userspace IOAPIC on edge-triggered
 interrupt EOI

Vitaly Kuznetsov <vkuznets@...hat.com> writes:
>linmiaohe <linmiaohe@...wei.com> writes:
>
>> Vitaly Kuznetsov <vkuznets@...hat.com> writes:
>>>linmiaohe <linmiaohe@...wei.com> writes:
>>
>> Yeh, there may be a buggy userspace hidden from this unexpected EOI 
>> notifications. It may not be worth enough to fix it as we may spend many time to catch the bug.
>> Perhaps we should only remove the pointless checking of irq->level for 
>> cleanup. :)
>
>I'm feeling brave so in case nobody expresses any particular concerns let's just fix it :-)
>

Sounds good. :)