Re: [Xen-devel] [v3 06/15] vmx: Extend struct pi_desc to support VT-d Posted-Interrupts

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 24/06/15 06:18, Feng Wu wrote:
> Extend struct pi_desc according to VT-d Posted-Interrupts Spec.
>
> Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Although this, like many other patches in the series needs a VT-d
maintainers ack/review.

> ---
> v3:
> - Use u32 instead of u64 for the bitfield in 'struct pi_desc'
>
>  xen/include/asm-x86/hvm/vmx/vmcs.h | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
> b/xen/include/asm-x86/hvm/vmx/vmcs.h
> index 1104bda..dedfaef 100644
> --- a/xen/include/asm-x86/hvm/vmx/vmcs.h
> +++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
> @@ -81,8 +81,19 @@ struct vmx_domain {
>  
>  struct pi_desc {
>      DECLARE_BITMAP(pir, NR_VECTORS);
> -    u32 control;
> -    u32 rsvd[7];
> +    union {
> +        struct
> +        {
> +        u16 on     : 1,  /* bit 256 - Outstanding Notification */
> +            sn     : 1,  /* bit 257 - Suppress Notification */
> +            rsvd_1 : 14; /* bit 271:258 - Reserved */
> +        u8  nv;          /* bit 279:272 - Notification Vector */
> +        u8  rsvd_2;      /* bit 287:280 - Reserved */
> +        u32 ndst;        /* bit 319:288 - Notification Destination */
> +        };
> +        u64 control;
> +    };
> +    u32 rsvd[6];
>  } __attribute__ ((aligned (64)));
>  
>  #define ept_get_wl(ept)   ((ept)->ept_wl)


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