linux-kernel - Re: [PATCH v2 03/22] KVM: SVM: immediately inject INTR vmexit

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Message-ID: <8bc4c38a-1717-1e4f-b322-fdd51f614717@redhat.com>
Date:   Thu, 21 May 2020 16:08:19 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     wei.huang2@....com, cavery@...hat.com,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Oliver Upton <oupton@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 03/22] KVM: SVM: immediately inject INTR vmexit

On 21/05/20 14:50, Vitaly Kuznetsov wrote:
> Sorry for reporting this late but I just found out that this commit
> breaks Hyper-V 2016 on KVM on SVM completely (always hangs on boot). I
> haven't investigated it yet (well, this is Windows, you know...) but
> what's usually different about Hyper-V is that unlike KVM/Linux it has
> handlers for some hardware interrupts in the guest and not in the
> hypervisor.

"Always hangs on boot" is easy. :)  At this point I think it's easiest
to debug it on top of the whole pending SVM patches that remove
exit_required completely (and exit_required is not coming back anyway).

Can you get a trace and send it to me?

Paolo