From: Paolo Bonzini <pbonzini@redhat.com>
To: Wanpeng Li <kernellwp@gmail.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>
Subject: Re: [PATCH] x86/smp: Add irq_enter/exit() in smp_reschedule_interrupt()
Date: Wed, 19 Oct 2016 16:10:54 +0200 [thread overview]
Message-ID: <2d1e0bd3-5e5b-4a06-9005-327cc6364050@redhat.com> (raw)
In-Reply-To: <CANRm+CwL9gW1-aZkc-VZ4u-jSTr_p7aDXx3jPs3X9M8y+rrFDg@mail.gmail.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.
>
> [...]
>
>>
>> If -cpu host,-x2apic we should go through mmio when writes xapic EOI.
>
> Any ideas? :)
Make apic_set_eoi_write return the old pointer?
Paolo
next prev parent reply other threads:[~2016-10-19 16:33 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 [this message]
2016-10-19 14:30 ` Wanpeng Li
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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