linux-kernel - Re: [V0 PATCH] pvh: Disable PSE feature for now

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Message-ID: <20140128034634.GC20680@pegasus.dumpdata.com>
Date:	Mon, 27 Jan 2014 22:46:34 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Mukesh Rathor <mukesh.rathor@...cle.com>
Cc:	roger.pau@...rix.com, Xen-devel@...ts.xensource.com,
	linux-kernel@...r.kernel.org
Subject: Re: [V0 PATCH] pvh: Disable PSE feature for now

On Mon, Jan 27, 2014 at 06:18:39PM -0800, Mukesh Rathor wrote:
> Until now, xen did not expose PSE to pvh guest, but a patch was submitted
> to xen list to enable bunch of features for a pvh guest. PSE has not been

Which 'patch'?

> looked into for PVH, so until we can do that and test it to make sure it
> works, disable the feature to avoid flood of bugs.

I think we want a flood of bugs, no?
> 
> Signed-off-by: Mukesh Rathor <mukesh.rathor@...cle.com>
> ---
>  arch/x86/xen/enlighten.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index a4d7b64..4e952046 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1497,6 +1497,11 @@ static void __init xen_pvh_early_guest_init(void)
>  	xen_have_vector_callback = 1;
>  	xen_pvh_set_cr_flags(0);
>  
> +        /* pvh guests are not quite ready for large pages yet */
> +        setup_clear_cpu_cap(X86_FEATURE_PSE);
> +        setup_clear_cpu_cap(X86_FEATURE_PSE36);
> +
> +
>  #ifdef CONFIG_X86_32
>  	BUG(); /* PVH: Implement proper support. */
>  #endif
> -- 
> 1.7.2.3
> 
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