linux-kernel - Re: [PATCH] xen/pvhvm: If xen_platform

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Date:	Wed, 4 Dec 2013 10:48:17 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<stefano.stabellini@...citrix.com>, <ian.campbell@...rix.com>,
	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>,
	<boris.ostrovsky@...cle.com>, <david.vrabel@...rix.com>,
	<leosilva@...ux.vnet.ibm.com>, <ashley@...leylai.com>,
	<peterhuewe@....de>, <mail@...jiv.net>, <tpmdd@...horst.net>,
	<tpmdd@...rix.com>, <dmitry.torokhov@...il.com>,
	<bhelgaas@...gle.com>, <plagnioj@...osoft.com>,
	<tomi.valkeinen@...com>, <tpmdd-devel@...ts.sourceforge.net>,
	<linux-input@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH] xen/pvhvm: If xen_platform_pci=0 is set don't blow up.

On Tue, 3 Dec 2013, Konrad Rzeszutek Wilk wrote:
> diff --git a/arch/x86/xen/platform-pci-unplug.c b/arch/x86/xen/platform-pci-unplug.c
> index 0a78524..087dfeb 100644
> --- a/arch/x86/xen/platform-pci-unplug.c
> +++ b/arch/x86/xen/platform-pci-unplug.c
> @@ -69,6 +69,24 @@ static int check_platform_magic(void)
>  	return 0;
>  }
>  
> +bool xen_has_pv_devices(void)
> +{
> +	if (!xen_domain())
> +		return false;
> +
> +	if (xen_hvm_domain()) {
> +		/* User requested no unplug, so no PV drivers. */
> +		if (xen_emul_unplug & XEN_UNPLUG_NEVER)
> +			return false;

Considering that if (xen_emul_unplug & XEN_UNPLUG_NEVER) we never set
xen_platform_pci_unplug, this check is redundant.


> +		/* And user has xen_platform_pci=0 set in guest config as
> +		 * driver did not modify the value. */
> +		if (!xen_platform_pci_unplug)
> +			return false;
> +	}
> +	return true;
> +}
> +EXPORT_SYMBOL_GPL(xen_has_pv_devices);
> +
>  void xen_unplug_emulated_devices(void)
>  {
>  	int r;
--
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