linux-kernel - Re: [PATCH] KVM: x86: fix xen guest panic due to lack of KVM_REQ

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Message-ID: <20140825090822.GA4955@kernel>
Date:	Mon, 25 Aug 2014 17:08:22 +0800
From:	Wanpeng Li <wanpeng.li@...ux.intel.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...nel.org>,
	Zhang Yang <yang.z.zhang@...el.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: fix xen guest panic due to lack of
 KVM_REQ_EVENT

Hi Paolo,
On Mon, Aug 25, 2014 at 11:01:07AM +0200, Paolo Bonzini wrote:
>Il 25/08/2014 09:58, Wanpeng Li ha scritto:
>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>> index c10408e..b7c0073 100644
>> --- a/arch/x86/kvm/x86.c
>> +++ b/arch/x86/kvm/x86.c
>> @@ -4928,6 +4928,8 @@ static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
>>  		if (!mask)
>>  			kvm_make_request(KVM_REQ_EVENT, vcpu);
>>  	}
>> +	if (!(int_shadow || mask))
>> +		kvm_make_request(KVM_REQ_EVENT, vcpu);
>>  }
>>  
>>  static void inject_emulated_exception(struct kvm_vcpu *vcpu)
>
>No, this patch undoes the optimization in the buggy patch.
>
>A KVM_REQ_EVENT must be missing somewhere else.
>

Could you give some tips in order that I can figure it out?

Regards,
Wanpeng Li 

>Paolo
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