linux-kernel - Re: [PATCH v2 00/10] KVM: x86: Interrupt-based mechanism for async

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Message-ID: <20200604174534.GB99235@redhat.com>
Date:   Thu, 4 Jun 2020 13:45:34 -0400
From:   Vivek Goyal <vgoyal@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org,
        x86@...nel.org, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Jim Mattson <jmattson@...gle.com>,
        Gavin Shan <gshan@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 00/10] KVM: x86: Interrupt-based mechanism for
 async_pf 'page present' notifications

On Thu, May 28, 2020 at 01:04:55PM +0200, Paolo Bonzini wrote:
> On 25/05/20 16:41, Vitaly Kuznetsov wrote:
> > Concerns were expressed around (ab)using #PF for KVM's async_pf mechanism,
> > it seems that re-using #PF exception for a PV mechanism wasn't a great
> > idea after all. The Grand Plan is to switch to using e.g. #VE for 'page
> > not present' events and normal APIC interrupts for 'page ready' events.
> > This series does the later.
> > 
> > Changes since v1:
> > - struct kvm_vcpu_pv_apf_data's fields renamed to 'flags' and 'token',
> >   comments added [Vivek Goyal]
> > - 'type1/2' names for APF events dropped from everywhere [Vivek Goyal]
> > - kvm_arch_can_inject_async_page_present() renamed to 
> >   kvm_arch_can_dequeue_async_page_present [Vivek Goyal]
> > - 'KVM: x86: deprecate KVM_ASYNC_PF_SEND_ALWAYS' patch added.
> > 
> > v1: https://lore.kernel.org/kvm/20200511164752.2158645-1-vkuznets@redhat.com/
> > QEMU patches for testing: https://github.com/vittyvk/qemu.git (async_pf2_v2 branch)
> 
> I'll do another round of review and queue patches 1-7; 8-9 will be
> queued later and separately due to the conflicts with the interrupt
> entry rework, but it's my job and you don't need to do anything else.

Hi Paolo,

I seee 1-7 got merged for 5.8. When you say patch 8-9 will be queue later,
you mean later in 5.8 or it will held till 5.9 merge window opens.

Thanks
Vivek