linux-kernel - Re: [PATCH V2 3/3] KVM: X86: Reset DR6 only when KVM_DEBUGREG_WONT

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Message-ID: <3cfedf5c-e901-c65c-b654-4d004e79b6b9@redhat.com>
Date:   Tue, 10 Aug 2021 12:41:03 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Lai Jiangshan <laijs@...ux.alibaba.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        kvm@...r.kernel.org
Subject: Re: [PATCH V2 3/3] KVM: X86: Reset DR6 only when
 KVM_DEBUGREG_WONT_EXIT

On 10/08/21 12:34, Lai Jiangshan wrote:
>>
>> +     * do_debug expects dr6 to be cleared after it runs, avoid that 
>> it sees
>> +     * a stale dr6 from the guest.
>> +     */
> 
> 
> do_debug() is renamed. Maybe you can use "The host kernel #DB handler".

Or exc_debug.

Paolo