linux-kernel - Re: AVIC related warning in enable_irq

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Message-ID: <ce6c3f43-07a4-be37-9d72-5a664d2fb09e@amd.com>
Date:   Wed, 6 May 2020 07:42:35 +0700
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Maxim Levitsky <mlevitsk@...hat.com>, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: AVIC related warning in enable_irq_window



On 5/5/20 7:12 PM, Paolo Bonzini wrote:
> On 05/05/20 09:55, Suravee Suthikulpanit wrote:
>> On the other hand, would be it useful to implement
>> kvm_make_all_cpus_request_but_self(),
>> which sends request to all other vcpus excluding itself?
> 
> Yes, that's also a possibility.  It's not too much extra complication if
> we add a new argument to kvm_make_vcpus_request_mask, like this:
> 
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 74bdb7bf3295..8f9dadb1ef42 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -258,7 +258,7 @@ static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait)
>   	return true;
>   }
>   
> -bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
> +bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req, struct kvm_vcpu *except,
>   				 unsigned long *vcpu_bitmap, cpumask_var_t tmp)
>   {
>   	int i, cpu, me;
> @@ -270,6 +270,8 @@ bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
>   	kvm_for_each_vcpu(i, vcpu, kvm) {
>   		if (vcpu_bitmap && !test_bit(i, vcpu_bitmap))
>   			continue;
> +		if (vcpu == except)
> +			continue;
>   
>   		kvm_make_request(req, vcpu);
>   		cpu = vcpu->cpu;
> 
> 
> Paolo
> 

Sounds good. I'll take care of this today.

Suravee