Re: [Xen-devel] [PATCH 2/6] hvm: add HVM_PARAM_VM_GENERATION_ID_ADDR

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-06-03 at 14:15 +0100, David Vrabel wrote:
> HVM_PARAM_VM_GENERATION_ID_ADDR is the guest physical address of the
> VM Generation ID.  This parameter will be written by hvmloader and read
> by the toolstack when updating the gen. ID (e.g., after restoring from a
> snapshot).
> 
> A HVM parameter is easier for the save/restore code to work with (than
> a XenStore key).
> 
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@citrix,com>

It's a bit ambiguous for hvm params which the hypervisor doesn't
actually interpret but strictly speaking this needs to be CCd to the h/v
guys. Added Jan/Keir.Tim.

> ---
>  xen/include/public/hvm/params.h |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/xen/include/public/hvm/params.h b/xen/include/public/hvm/params.h
> index 517a184..4d7c692 100644
> --- a/xen/include/public/hvm/params.h
> +++ b/xen/include/public/hvm/params.h
> @@ -145,6 +145,9 @@
>  /* SHUTDOWN_* action in case of a triple fault */
>  #define HVM_PARAM_TRIPLE_FAULT_REASON 31
>  
> -#define HVM_NR_PARAMS          32
> +/* Location of the VM Generation ID in guest physical address space. */
> +#define HVM_PARAM_VM_GENERATION_ID_ADDR 32
> +
> +#define HVM_NR_PARAMS          33
>  
>  #endif /* __XEN_PUBLIC_HVM_PARAMS_H__ */



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