linux-kernel - Re: [Xen-devel] [PATCH 3/3] Support Xen pv-domains using PAT

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Message-ID: <53FC689D.7020507@citrix.com>
Date:	Tue, 26 Aug 2014 11:59:41 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Juergen Gross <jgross@...e.com>, <stefan.bader@...onical.com>,
	<toshi.kani@...com>, <linux-kernel@...r.kernel.org>,
	<xen-devel@...ts.xensource.com>, <konrad.wilk@...cle.com>,
	<ville.syrjala@...ux.intel.com>, <hpa@...or.com>, <x86@...nel.org>
Subject: Re: [Xen-devel] [PATCH 3/3] Support Xen pv-domains using PAT

On 26/08/14 07:16, Juergen Gross wrote:
> With the dynamical mapping between cache modes and pgprot values it is now
> possible to use all cache modes via the Xen hypervisor PAT settings in a
> pv domain.
> 
> All to be done is to read the PAT configuration MSR and set up the translation
> tables accordingly.
[...]
> +void xen_init_cache_types(void)
> +{
> +	pat_init_cache_modes();
> +}

No need to introduce xen_init_cache_types(), just call
pat_init_cache_modes() directly.

>  void xen_set_pat(u64 pat)
>  {
> -	/* We expect Linux to use a PAT setting of
> -	 * UC UC- WC WB (ignoring the PAT flag) */
> -	WARN_ON(pat != 0x0007010600070106ull);
> +	xen_init_cache_types();
>  }

Remove xen_set_pat() and remove the special-cased handling of the PAT
MSR from xen_write_msr_safe().

David
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