On 22/01/2020 20:23, Wei Liu wrote:
> diff --git a/xen/arch/x86/guest/hyperv/hyperv.c 
> b/xen/arch/x86/guest/hyperv/hyperv.c
> index 085e646dc6..89a8f316b2 100644
> --- a/xen/arch/x86/guest/hyperv/hyperv.c
> +++ b/xen/arch/x86/guest/hyperv/hyperv.c
> @@ -32,6 +32,7 @@
>  struct ms_hyperv_info __read_mostly ms_hyperv;
>  DEFINE_PER_CPU_READ_MOSTLY(void *, hv_pcpu_input_arg);
>  DEFINE_PER_CPU_READ_MOSTLY(unsigned int, hv_vp_index);
> +DEFINE_PER_CPU_READ_MOSTLY(void *, hv_vp_assist);

You'll get fewer holes in the percpu data area by moving this
declaration up by one.

~Andrew

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