linux-kernel - Re: [PART1 RFC v2 06/10] svm: Add interrupt injection via AVIC

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Message-ID: <56E67C49.6070807@amd.com>
Date:	Mon, 14 Mar 2016 15:54:33 +0700
From:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:	Paolo Bonzini <pbonzini@...hat.com>, <rkrcmar@...hat.com>,
	<joro@...tes.org>, <bp@...en8.de>, <gleb@...nel.org>,
	<alex.williamson@...hat.com>
CC:	<kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<wei@...hat.com>, <sherry.hurwitz@....com>
Subject: Re: [PART1 RFC v2 06/10] svm: Add interrupt injection via AVIC

Hi,

Please ignore this. I should have read the whole thread before reply :(
Sorry for spam.

Suravee

On 03/14/2016 12:25 PM, Suravee Suthikulpanit wrote:
>
>
> On 03/07/2016 10:36 PM, Paolo Bonzini wrote:
>>
>>
>> On 04/03/2016 21:46, Suravee Suthikulpanit wrote:
>>> +static void svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec)
>>> +{
>>> +    struct vcpu_svm *svm = to_svm(vcpu);
>>> +
>>> +    kvm_lapic_set_vector(vec, avic_get_bk_page_entry(svm, APIC_IRR));
>>> +
>>> +    if (vcpu->mode == IN_GUEST_MODE) {
>>> +        wrmsrl(SVM_AVIC_DOORBELL,
>>> +               __default_cpu_present_to_apicid(vcpu->cpu));
>>> +    } else {
>>> +        kvm_vcpu_kick(vcpu);
>>> +    }
>>
>> You also need to add
>>
>>     kvm_make_request(KVM_REQ_EVENT, vcpu);
>>
>> before the "if", similar to vmx_deliver_posted_interrupt.
>>
>> Paolo
>>
>
> Actually, I should only need that just before the kvm_cpu_kick(vcpu)
> isn't it. I don't think we need it in the case when sending doorbell.
>
> Thanks,
> Suravee