linux-kernel - Re: [PATCH] kvm: x86: Fix debug typo error in lapic

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Message-ID: <CAHqbYQt0ERa4kgK97D0NWZnZdF9TtdskaH0as7fZyO7N=5AzPw@mail.gmail.com>
Date:	Wed, 8 Jan 2014 18:14:15 -0500
From:	Hu Yaohui <loki2441@...il.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Chen Fan <chen.fan.fnst@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>, gleb@...hat.com, pbonzini@...hat.com
Subject: Re: [PATCH] kvm: x86: Fix debug typo error in lapic

Hi guys,
I think you should be pretty familiar with lapic. I would really
appreciate it if someone could shed some lights on my problem
regarding Guest TLB flush IPI.
Supposed we get two vcpus 0 and 1.
When vcpu#0 wants to invalidate the tlb entry on vcpu#1. An IPI will
be generated by lapic on vcpu#0 by writing to ICR which will cause a
vmexit.
apic_send_ipi->kvm_irq_delivery_to_apic->kvm_apic_set_irq->__apic_accept_irq
In __apic_accept_irq, it will call kvm_make_request, kvm_vcpu_kick.
If vcpu#1 in guest mode, how can it receives this IPI immediately, or
the stale tlb entry could be accessed. Thanks for your time!

Best Wishes,
Yaohui Hu

On Wed, Jan 8, 2014 at 4:10 PM, Marcelo Tosatti <mtosatti@...hat.com> wrote:
> On Thu, Jan 02, 2014 at 05:14:11PM +0800, Chen Fan wrote:
>> fix the 'vcpi' typos when apic_debug is enabled.
>>
>> Signed-off-by: Chen Fan <chen.fan.fnst@...fujitsu.com>
>> ---
>>  arch/x86/kvm/lapic.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> Applied, thanks.
>
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