linux-kernel - Re: [PATCH v2 0/6] KVM: x86: cleanup and speedup for APICv

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Date:   Tue, 7 Feb 2017 22:52:18 +0100
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 0/6] KVM: x86: cleanup and speedup for APICv

2017-02-07 18:23+0100, Paolo Bonzini:
> On 19/12/2016 17:17, Paolo Bonzini wrote:
>> These are the fixed patches that now pass vmx.flat.  The issue in
>> "KVM: x86: do not scan IRR twice on APICv vmentry" was that,
>> in v1 of the patches, kvm_cpu_get_interrupt did not scan IRR
>> at all if it found PIR.ON=0.  This is now fixed in patches 4 and 5.
>> 
>> Another latent bug has to be fixed in patch 2.  The patch also
>> highlights the maze that check_nested_events has become.  Fixing
>> that is left for later.
>> 
>> The patches are on top of the (non-APICv-related) KVM_REQ_EVENT
>> patches from this morning.  According to kvm-unit-tests, patch 6 speeds
>> up self-IPIs (if not done through the accelerated self-IPI MSR) by 5-10%.
>> 
>> Paolo
> 
> Ping?

I think the patches are ready to be applied -- there might be some rough
edges with nested, but it was broken even before, and they fix at least
one known bug.