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Subject: Re: [PATCH v3 4/6] KVM: X86: Implement PV IPIs send hypercall
To:     Wanpeng Li <kernellwp@gmail.com>, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org
Cc:     =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>
References: <1530598891-21370-1-git-send-email-wanpengli@tencent.com>
 <1530598891-21370-5-git-send-email-wanpengli@tencent.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
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Message-ID: <a4f281c2-f189-ae23-bf86-2ea009b38357@redhat.com>
Date:   Thu, 19 Jul 2018 18:47:01 +0200
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On 03/07/2018 08:21, Wanpeng Li wrote:
> +
> +	rcu_read_lock();
> +	map = rcu_dereference(kvm->arch.apic_map);
> +
> +	for_each_set_bit(i, &ipi_bitmap_low, BITS_PER_LONG) {
> +		vcpu = map->phys_map[i]->vcpu;
> +		if (!kvm_apic_set_irq(vcpu, &irq, NULL))
> +			return 1;
> +	}
> +
> +	for_each_set_bit(i, &ipi_bitmap_high, BITS_PER_LONG) {
> +		vcpu = map->phys_map[i + BITS_PER_LONG]->vcpu;
> +		if (!kvm_apic_set_irq(vcpu, &irq, NULL))
> +			return 1;
> +	}
> +

This should be the guest's BITS_PER_LONG, not the host's (i.e. you need
to pass op_64_bit from kvm_emulate_hypercall).

Thanks,

Paolo