linux-kernel - Re: [PATCH v2 1/2] x86/hyper-v: Stop caring about EOI for direct stimers

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Message-ID: <20181213121722.GA2474@rkaganb.sw.ru>
Date:   Thu, 13 Dec 2018 12:17:26 +0000
From:   Roman Kagan <rkagan@...tuozzo.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] x86/hyper-v: Stop caring about EOI for direct
 stimers

On Wed, Dec 12, 2018 at 05:50:16PM +0100, Vitaly Kuznetsov wrote:
> Turns out we over-engineered Direct Mode for stimers a bit: unlike
> traditional stimers where we may want to try to re-inject the message upon
> EOI, Direct Mode stimers just set the irq in APIC and kvm_apic_set_irq()
> fails only when APIC is disabled (see APIC_DM_FIXED case in
> __apic_accept_irq()). Remove the redundant part.
> 
> Suggested-by: Roman Kagan <rkagan@...tuozzo.com>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  arch/x86/kvm/hyperv.c | 36 +++---------------------------------
>  1 file changed, 3 insertions(+), 33 deletions(-)

Reviewed-by: Roman Kagan <rkagan@...tuozzo.com>