linux-kernel - Re: [PATCH] KVM: lapic: stop advertising DIRECTED

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Message-ID: <87r2oyzug5.fsf@vitty.brq.redhat.com>
Date:   Mon, 05 Mar 2018 11:29:46 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Peter Xu <peterx@...hat.com>, kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: lapic: stop advertising DIRECTED_EOI when in-kernel IOAPIC is in use

Vitaly Kuznetsov <vkuznets@...hat.com> writes:

> Devices which use level-triggered interrupts under Windows 2016 with
> Hyper-V role enabled don't work: Windows disables EOI broadcast in SPIV
> unconditionally. Our in-kernel IOAPIC implementation emulates an old IOAPIC
> version which has no EOI register so EOI never happens.
>
> The issue was discovered and discussed a while ago:
> https://www.spinics.net/lists/kvm/msg148098.html
>

Radim, Paolo,

do we have a consensus here? (I wouldn't mind re-writing commit message
in case you think we shouldn't blame Windows, I just want to have the
annoying bug fixed :-)

-- 
  Vitaly