From: Wanpeng Li <kernellwp@gmail.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Wanpeng Li <wanpeng.li@hotmail.com>,
Ingo Molnar <mingo@kernel.org>, Mike Galbraith <efault@gmx.de>,
Thomas Gleixner <tglx@linutronix.de>,
Radim Krcmar <rkrcmar@redhat.com>
Subject: Re: [PATCH] x86/smp: Add irq_enter/exit() in smp_reschedule_interrupt()
Date: Wed, 19 Oct 2016 22:30:38 +0800 [thread overview]
Message-ID: <CANRm+CzJ=6SsN=NYi==Q5g1C_7a=KwE=+iMGF2aV+DvW7CA48g@mail.gmail.com> (raw)
In-Reply-To: <2d1e0bd3-5e5b-4a06-9005-327cc6364050@redhat.com>
Cc Radim,
2016-10-19 22:10 GMT+08:00 Paolo Bonzini <pbonzini@redhat.com>:
>
>
> On 19/10/2016 16:01, Wanpeng Li wrote:
>> 2016-10-18 8:01 GMT+08:00 Wanpeng Li <kernellwp@gmail.com>:
>>> 2016-10-17 18:08 GMT+08:00 Paolo Bonzini <pbonzini@redhat.com>:
>>> [...]
>>>>>> Something like the below avoids all that. Paravirt will still need fixing.
>>>>>
>>>>> kvm_guest_apic_eoi_write
>>>>> -> native_apic_msr_write
>>>>
>>>> kvm_guest_apic_eoi_write can use native_apic_msr_eoi_write too:
>>>>
>>>> diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
>>>> index f5aaf6c83222..9769d76a62c4 100644
>>>> --- a/arch/x86/include/asm/apic.h
>>>> +++ b/arch/x86/include/asm/apic.h
>>>> @@ -174,7 +174,7 @@ static inline void disable_local_APIC(void) { }
>>>> static inline void lapic_update_tsc_freq(void) { }
>>>> #endif /* !CONFIG_X86_LOCAL_APIC */
>>>>
>>>> -#ifdef CONFIG_X86_X2APIC
>>>> +#if defined CONFIG_X86_X2APIC || defined CONFIG_KVM_GUEST
>>>
>>> If CONFIG_X86_X2APIC is undefined and CONFIG_KVM_GUEST is defined,
>>> there are undefined reference warning for x2apic_mode and check_x2apic
>>> etc since they are extern variables and just define under
>>> CONFIG_X86_X2APIC.
>>
This results in undefined reference warning.
>>
>>>
>>> If -cpu host,-x2apic we should go through mmio when writes xapic EOI.
>>
>> Any ideas? :)
>
> Make apic_set_eoi_write return the old pointer?
Could you elaborate? :)
Regards,
Wanpeng Li
next prev parent reply other threads:[~2016-10-19 14:30 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-14 1:48 [PATCH] x86/smp: Add irq_enter/exit() in smp_reschedule_interrupt() Wanpeng Li
2016-10-14 12:19 ` [tip:x86/urgent] " tip-bot for Wanpeng Li
2016-10-16 13:39 ` [PATCH] " Peter Zijlstra
2016-10-17 4:19 ` Wanpeng Li
2016-10-17 8:22 ` Peter Zijlstra
2016-10-17 9:45 ` Wanpeng Li
2016-10-17 10:08 ` Paolo Bonzini
2016-10-17 10:23 ` Wanpeng Li
2016-10-18 0:01 ` Wanpeng Li
2016-10-19 14:01 ` Wanpeng Li
2016-10-19 14:10 ` Paolo Bonzini
2016-10-19 14:30 ` Wanpeng Li [this message]
2016-10-24 14:32 ` Paolo Bonzini
2016-10-25 2:52 ` Wanpeng Li
2016-10-17 12:19 ` Wanpeng Li
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