Re: [Xen-devel] [PATCH] docs/design: introduce HVMMEM_ioreq_serverX types

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.02.16 at 16:49, <paul.durrant@xxxxxxxxxx> wrote:
> +To allow an IOREQ server to claim or release a claim to a type a new pair
> +of hypercalls will be introduced:
> +
> +- HVMOP\_map\_mem\_type\_to\_ioreq\_server
> +- HVMOP\_unmap\_mem\_type\_from\_ioreq\_server
> +
> +and an associated argument structure:
> +
> +             struct hvm_ioreq_mem_type {
> +                     domid_t domid;      /* IN - domain to be serviced */
> +                     ioservid_t id;      /* IN - server id */
> +                     hvmmem_type_t type; /* IN - memory type */
> +                     uint32_t flags;     /* IN - types of access to be
> +                                         intercepted */
> +
> +     #define _HVMOP_IOREQ_MEM_ACCESS_READ 0
> +     #define HVMOP_IOREQ_MEM_ACCESS_READ \
> +             (1 << _HVMOP_IOREQ_MEM_ACCESS_READ)
> +
> +     #define _HVMOP_IOREQ_MEM_ACCESS_WRITE 1
> +     #define HVMOP_IOREQ_MEM_ACCESS_WRITE \
> +             (1 << _HVMOP_IOREQ_MEM_ACCESS_WRITE)
> +
> +             };

How about having just one new hypercall, with flags being zero
meaning "unmap"?

Jan


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