linux-kernel - Re: [PATCH 25 of 38] xen mtrr: Add mtrr

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Date:	Thu, 13 Nov 2008 20:28:48 +0000
From:	Mark McLoughlin <markmc@...hat.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Xen-devel <xen-devel@...ts.xensource.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Ian Campbell <ian.campbell@...rix.com>
Subject: Re: [PATCH 25 of 38] xen mtrr: Add mtrr_ops support for Xen mtrr

On Thu, 2008-11-13 at 11:10 -0800, Jeremy Fitzhardinge wrote:

> diff --git a/arch/x86/kernel/cpu/mtrr/xen.c b/arch/x86/kernel/cpu/mtrr/xen.c
> new file mode 100644
> --- /dev/null
> +++ b/arch/x86/kernel/cpu/mtrr/xen.c
> @@ -0,0 +1,59 @@
...
> +
> +/* DOM0 TODO: Need to fill in the remaining mtrr methods to have full
> + * working userland mtrr support. */
> +static struct mtrr_ops xen_mtrr_ops = {
> +	.vendor            = X86_VENDOR_UNKNOWN,
> +//	.set               = xen_set_mtrr,
> +//	.get               = xen_get_mtrr,
> +	.get_free_region   = generic_get_free_region,
> +//	.validate_add_page = xen_validate_add_page,
> +	.have_wrcomb       = positive_have_wrcomb,
> +	.use_intel_if	   = 0,
> +	.num_var_ranges	   = xen_num_var_ranges,
> +};

...

I'm vague on the details now, but looking back at the dom0 patch set
here:

http://git.et.redhat.com/?p=linux-2.6-dom0-pvops.git;a=shortlog;h=55abc194080b5cf31cd66f5e35e8e5c5af2aa927

I see we did have a bunch more mtrr work e.g. fixing the TODO above:

http://git.et.redhat.com/?p=linux-2.6-dom0-pvops.git;a=commitdiff;h=93f779bf3d79f28d0933bfbc53f7b8c5b6496081

Cheers,
Mark.

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