linux-kernel - Re: [Xen-devel] [RFC PATCH 01/20] x86/xen/MSI: Eliminate arch_msix_mask_irq() and arch_msi_mask

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Message-ID: <53E9D9DD.3060901@citrix.com>
Date:	Tue, 12 Aug 2014 10:09:49 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Yijing Wang <wangyijing@...wei.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	<linux-mips@...ux-mips.org>, <linux-ia64@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, Xinwei Hu <huxinwei@...wei.com>,
	"H. Peter Anvin" <hpa@...or.com>, <sparclinux@...r.kernel.org>,
	<linux-s390@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Joerg Roedel <joro@...tes.org>, <x86@...nel.org>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	<xen-devel@...ts.xenproject.org>, <arnab.basu@...escale.com>,
	Arnd Bergmann <arnd@...db.de>,
	Marc Zyngier <marc.zyngier@....com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	<linux-arm-kernel@...ts.infradead.org>,
	Tony Luck <tony.luck@...el.com>,
	<linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
	Wuyun <wuyun.wu@...wei.com>, <linuxppc-dev@...ts.ozlabs.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [Xen-devel] [RFC PATCH 01/20] x86/xen/MSI: Eliminate arch_msix_mask_irq()
 and arch_msi_mask_irq()

On 12/08/14 08:25, Yijing Wang wrote:
> Commit 0e4ccb150 added two __weak arch functions arch_msix_mask_irq()
> and arch_msi_mask_irq() to fix a bug found when running xen in x86.
> Introduced these two funcntions make MSI code complex. This patch
> reverted commit 0e4ccb150 and add #ifdef for x86 msi_chip to fix this
> bug for simplicity. Also this is preparation for using struct
> msi_chip instead of weak arch MSI functions in all platforms.
[...]
>  static struct irq_chip msi_chip = {
>  	.name			= "PCI-MSI",
> +#ifdef CONFIG_XEN
> +	.irq_unmask		= nop_unmask_msi_irq,
> +	.irq_mask		= nop_mask_msi_irq,
> +#else
>  	.irq_unmask		= unmask_msi_irq,
>  	.irq_mask		= mask_msi_irq,
> +#endif

No.  CONFIG_XEN kernels can run on Xen and bare metal so this must be a
runtime option.

David
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