Re: [Xen-devel] [PATCH 4/5] libxc/pvh: set default MTRR type to write-back

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, May 10, 2018 at 06:15:04PM +0100, Roger Pau Monne wrote:
> @@ -1014,6 +1034,30 @@ static int vcpu_hvm(struct xc_dom_image *dom)
>      if ( dom->start_info_seg.pfn )
>          bsp_ctx.cpu.rbx = dom->start_info_seg.pfn << PAGE_SHIFT;
>  
> +    /* Set the MTRR. */
> +    bsp_ctx.mtrr_d.typecode = HVM_SAVE_CODE(MTRR);
> +    bsp_ctx.mtrr_d.instance = 0;
> +    bsp_ctx.mtrr_d.length = HVM_SAVE_LENGTH(MTRR);
> +
> +    mtrr_record = hvm_get_save_record(full_ctx, HVM_SAVE_CODE(MTRR), 0);
> +    if ( !mtrr_record )
> +    {
> +        xc_dom_panic(dom->xch, XC_INTERNAL_ERROR,
> +                     "%s: unable to get MTRR save record", __func__);
> +        goto out;
> +    }

Will this break cross version migration when the older hypervisor
doesn't have such record?

Wei.

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