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Date:   Thu, 21 May 2020 16:08:19 +0200
From:   Paolo Bonzini <>
To:     Vitaly Kuznetsov <>
        Sean Christopherson <>,
        Oliver Upton <>,
        Jim Mattson <>,,
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?


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