Re: [Xen-devel] [PATCH RFC v1 28/74] x86: initialise shared_info page

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.01.18 at 14:05, <wei.liu2@xxxxxxxxxx> wrote:
> --- a/xen/arch/x86/guest/xen.c
> +++ b/xen/arch/x86/guest/xen.c
> @@ -72,6 +72,30 @@ void __init probe_hypervisor(void)
>      xen_guest = true;
>  }
>  
> +static void map_shared_info(struct e820map *e820)
> +{
> +    paddr_t frame = 0xff000000; /* TODO: Hardcoded beside magic frames. */

What are the plans here?

> +    struct xen_add_to_physmap xatp = {
> +        .domid = DOMID_SELF,
> +        .idx = 0,
> +        .space = XENMAPSPACE_shared_info,
> +        .gpfn = frame >> PAGE_SHIFT,
> +    };
> +
> +    if ( !e820_add_range(e820, frame, frame + PAGE_SIZE, E820_RESERVED) )
> +        panic("Failed to reserve shared_info range");
> +
> +    if ( xen_hypercall_memory_op(XENMEM_add_to_physmap, &xatp) )
> +        panic("Failed to map shared_info page");

Also report the error code?

Jan


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