linux-kernel - Re: [PATCH 1/3] KVM: x86: merge kvm_arch_set_irq with kvm_set_msi

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Date:	Mon, 2 Nov 2015 17:08:02 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krcmar <rkrcmar@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH 1/3] KVM: x86: merge kvm_arch_set_irq with
 kvm_set_msi_inatomic



On 02/11/2015 15:59, Radim Krcmar wrote:
> > We do not want to do too much work in atomic context, in particular
> > not walking all the VCPUs of the virtual machine.  So we want
> > to distinguish the architecture-specific injection function for irqfd
> > from kvm_set_msi.  Since it's still empty, reuse the newly added
> > kvm_arch_set_irq and rename it to kvm_arch_set_irq_inatomic.
> 
> kvm/queue uses kvm_arch_set_irq since b7184313f4b9 ("kvm/x86: Hyper-V
> synthetic interrupt controller").
> 
> Is synic going to be dropped before this patch is merged?

Yes.  Both because the Virtuozzo people confirmed that kvm_arch_set_irq
isn't needed for synic, and because synic is currently broken with APICv.

Paolo
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