linux-kernel - Re: [PATCH v6 3/4] KVM: async_pf: Force a nested vmexit if the injected #PF is async

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Message-ID: <293c4524-5869-2d3f-e0a3-92bde4430b81@redhat.com>
Date:   Wed, 28 Jun 2017 14:56:15 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        Wanpeng Li <wanpeng.li@...mail.com>
Subject: Re: [PATCH v6 3/4] KVM: async_pf: Force a nested vmexit if the
 injected #PF is async_pf



On 28/06/2017 14:25, Wanpeng Li wrote:
> From: Wanpeng Li <wanpeng.li@...mail.com>
> 
> Add an nested_apf field to vcpu->arch.exception to identify an async page 
> fault, and constructs the expected vm-exit information fields. Force a 
> nested VM exit from nested_vmx_check_exception() if the injected #PF is 
> async page fault. Extending the userspace interface KVM_GET_VCPU_EVENTS
> and KVM_SET_VCPU_EVENTS for live migration.
> 
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Radim Krčmář <rkrcmar@...hat.com>
> Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
> ---

Radim, Wanpeng,

the patch is nice now but I'm still not 100% sure about the live
migration part.  Why do we need to pass nested_apf to userspace, but not
nested_apf_token?

Paolo