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Re: [PATCH v4 07/10] x86: Derive XEN_MSR_PAT from its individual entries
- To: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 16 Dec 2022 08:52:27 +0100
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- Cc: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 16 Dec 2022 07:52:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.12.2022 00:57, Demi Marie Obenour wrote:
> --- a/xen/arch/x86/mm.c
> +++ b/xen/arch/x86/mm.c
> @@ -6357,6 +6357,15 @@ unsigned long get_upper_mfn_bound(void)
> return min(max_mfn, 1UL << (paddr_bits - PAGE_SHIFT)) - 1;
> }
>
> +static void __init __maybe_unused build_assertions(void)
> +{
> + /*
> + * If this trips, live migration of PV guests to and from this Xen is
> + * broken.
> + */
As is anyone using in a hard-coded fashion what the public interface (xen.h)
says. This wants adding here imo. Then
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
> + BUILD_BUG_ON(XEN_MSR_PAT != 0x050100070406ULL);
> +}
> +
> /*
> * Local variables:
> * mode: C
|
