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Date:   Mon, 15 Apr 2019 14:27:36 +0200
From:   Vitaly Kuznetsov <>
To:     Long Li <>, Simon Xiao <>
        "K. Y. Srinivasan" <>,
        Haiyang Zhang <>,
        Stephen Hemminger <>,
        Sasha Levin <>,
        "Michael Kelley \(EOSG\)" <>,
Subject: Re: [PATCH] x86/hyper-v: implement EOI assist

Vitaly Kuznetsov <> writes:

> Hyper-V TLFS suggests an optimization to avoid imminent VMExit on EOI:
> "The OS performs an EOI by atomically writing zero to the EOI Assist field
> of the virtual VP assist page and checking whether the "No EOI required"
> field was previously zero. If it was, the OS must write to the
> HV_X64_APIC_EOI MSR thereby triggering an intercept into the hypervisor."
> Implement the optimization in Linux.

Simon, Long,

did you get a chance to run some tests with this?


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