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From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: qemu-devel@nongnu.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Subject: [BUG] No irqchip created after commit 11bc4a13d1f4 ("kvm: convert "-machine kernel_irqchip" to an accelerator property")
Date: Fri, 20 Dec 2019 15:11:27 +0100	[thread overview]
Message-ID: <87eewz84ts.fsf@vitty.brq.redhat.com> (raw)

I apologize if this was already reported,

I just noticed that with the latest updates QEMU doesn't start with the
following configuration:

qemu-system-x86_64 -name guest=win10 -machine pc,accel=kvm -cpu host,hv_vpindex,hv_synic ...

qemu-system-x86_64: failed to turn on HyperV SynIC in KVM: Invalid argument
qemu-system-x86_64: kvm_init_vcpu failed: Invalid argument

If I add 'kernel-irqchip=split' or ',kernel-irqchip=on' it starts as
usual. I bisected this to the following commit:

commit 11bc4a13d1f4b07dafbd1dda4d4bf0fdd7ad65f2 (HEAD, refs/bisect/bad)
Author: Paolo Bonzini <pbonzini@redhat.com>
Date:   Wed Nov 13 10:56:53 2019 +0100

    kvm: convert "-machine kernel_irqchip" to an accelerator property
    
so aparently we now default to 'kernel_irqchip=off'. Is this the desired
behavior?

-- 
Vitaly



             reply	other threads:[~2019-12-20 14:23 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-20 14:11 Vitaly Kuznetsov [this message]
2019-12-20 15:39 ` [BUG] No irqchip created after commit 11bc4a13d1f4 ("kvm: convert "-machine kernel_irqchip" to an accelerator property") Paolo Bonzini
2019-12-28  9:32   ` [PATCH] accel/kvm: Make "kernel_irqchip" default on Xiaoyao Li
2019-12-28 10:02     ` Paolo Bonzini
2019-12-28 10:16       ` Xiaoyao Li
2019-12-28 10:57         ` Paolo Bonzini
2019-12-28 11:14           ` Xiaoyao Li

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