linux-kernel - Re: [PATCH 1/1] x86/apic: Introduce paravirq irq

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Date:	Sat, 13 Aug 2016 08:20:30 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	alex.popov@...ux.com
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Marc Zyngier <marc.zyngier@....com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>,
	Radim Krcmar <rkrcmar@...hat.com>,
	Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
	x86@...nel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 1/1] x86/apic: Introduce paravirq irq_domain



On 13/08/2016 00:07, Alexander Popov wrote:
> I.e. our irq_mask()/irq_unmask() callbacks get irq_desc of the interrupt
> which should be masked/unmasked and can ask the hypervisor to stop/start
> injecting the vector of that particular interrupt.

So just let the irqdomain know about your hypervisor and avoid the
pointless indirection through function pointers, and only call
arch_init_paravirq_domain in a file specific to your hypervisor.

Paolo