linux-kernel - Re: [PATCH 2/4] KVM: SVM: Fixes setting V

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Date:   Thu, 7 May 2020 08:29:03 +0700
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     joro@...tes.org, jon.grimm@....com, mlevitsk@...hat.com
Subject: Re: [PATCH 2/4] KVM: SVM: Fixes setting V_IRQ while AVIC is still
 enabled



On 5/6/20 11:29 PM, Paolo Bonzini wrote:
> On 06/05/20 15:17, Suravee Suthikulpanit wrote:
>>    */
>> -void kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit)
>> +void kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit,
>> +			      struct kvm_vcpu *except)
>>   {
>>   	unsigned long old, new, expected;
>>   
>> @@ -8110,7 +8111,16 @@ void kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit)
>>   	trace_kvm_apicv_update_request(activate, bit);
>>   	if (kvm_x86_ops.pre_update_apicv_exec_ctrl)
>>   		kvm_x86_ops.pre_update_apicv_exec_ctrl(kvm, activate);
>> -	kvm_make_all_cpus_request(kvm, KVM_REQ_APICV_UPDATE);
>> +
>> +	/*
>> +	 * Sending request to update APICV for all other vcpus,
>> +	 * while update the calling vcpu immediately instead of
>> +	 * waiting for another #VMEXIT to handle the request.
>> +	 */
>> +	kvm_make_all_cpus_request_except(kvm, KVM_REQ_APICV_UPDATE,
>> +					 except);
>> +	if (except)
>> +		kvm_vcpu_update_apicv(except);
> 
> Can you use kvm_get_running_vcpu() instead of touching all callers?
> Also a slightly better subject would be "KVM: SVM: Disable AVIC before
> setting V_IRQ".
> 
> Paolo
> 

Right, that's better idea. I'll send out V2 separately.

Thanks,
Suravee