Re: [Xen-devel] [PATCH v1 4/5] tools: libxendevicemodel: Provide xendevicemodel_add_to_physmap

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Xen-devel [mailto:xen-devel-bounces@xxxxxxxxxxxxx] On Behalf Of
> Ross Lagerwall
> Sent: 18 October 2017 15:04
> To: Xen-devel <xen-devel@xxxxxxxxxxxxx>
> Cc: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>; Ian Jackson
> <Ian.Jackson@xxxxxxxxxx>; Wei Liu <wei.liu2@xxxxxxxxxx>
> Subject: [Xen-devel] [PATCH v1 4/5] tools: libxendevicemodel: Provide
> xendevicemodel_add_to_physmap
> 
> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
> ---
>  tools/libs/devicemodel/Makefile                 |  2 +-
>  tools/libs/devicemodel/core.c                   | 17 +++++++++++++++++
>  tools/libs/devicemodel/include/xendevicemodel.h | 13 +++++++++++++
>  tools/libs/devicemodel/libxendevicemodel.map    |  5 +++++
>  4 files changed, 36 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/libs/devicemodel/Makefile
> b/tools/libs/devicemodel/Makefile
> index 342371a..5b2df7a 100644
> --- a/tools/libs/devicemodel/Makefile
> +++ b/tools/libs/devicemodel/Makefile
> @@ -2,7 +2,7 @@ XEN_ROOT = $(CURDIR)/../../..
>  include $(XEN_ROOT)/tools/Rules.mk
> 
>  MAJOR    = 1
> -MINOR    = 1
> +MINOR    = 2
>  SHLIB_LDFLAGS += -Wl,--version-script=libxendevicemodel.map
> 
>  CFLAGS   += -Werror -Wmissing-prototypes
> diff --git a/tools/libs/devicemodel/core.c b/tools/libs/devicemodel/core.c
> index b66d4f9..2a23077 100644
> --- a/tools/libs/devicemodel/core.c
> +++ b/tools/libs/devicemodel/core.c
> @@ -564,6 +564,23 @@ int xendevicemodel_shutdown(
>      return xendevicemodel_op(dmod, domid, 1, &op, sizeof(op));
>  }
> 
> +int xendevicemodel_add_to_physmap(
> +    xendevicemodel_handle *dmod, domid_t domid, uint64_t idx, uint64_t
> gpfn)

Do you really want this to be single page? Populating VRAM is not going to be 
fast if you need to make 16MB / 4K hypercalls to do it.

  Paul

> +{
> +    struct xen_dm_op op;
> +    struct xen_dm_op_add_to_physmap *data;
> +
> +    memset(&op, 0, sizeof(op));
> +
> +    op.op = XEN_DMOP_add_to_physmap;
> +    data = &op.u.add_to_physmap;
> +
> +    data->idx = idx;
> +    data->gpfn = gpfn;
> +
> +    return xendevicemodel_op(dmod, domid, 1, &op, sizeof(op));
> +}
> +
>  int xendevicemodel_restrict(xendevicemodel_handle *dmod, domid_t
> domid)
>  {
>      return osdep_xendevicemodel_restrict(dmod, domid);
> diff --git a/tools/libs/devicemodel/include/xendevicemodel.h
> b/tools/libs/devicemodel/include/xendevicemodel.h
> index dda0bc7..2c4e392 100644
> --- a/tools/libs/devicemodel/include/xendevicemodel.h
> +++ b/tools/libs/devicemodel/include/xendevicemodel.h
> @@ -326,6 +326,19 @@ int xendevicemodel_shutdown(
>      xendevicemodel_handle *dmod, domid_t domid, unsigned int reason);
> 
>  /**
> + * Sets the GPFN at which a particular page appears in the domain's
> + * pseudophysical address space.
> + *
> + * @parm dmod a handle to an open devicemodel interface.
> + * @parm domid the domain id to be serviced
> + * @parm idx Index into GMFN space
> + * @parm gpfn GPFN in domid where the GMFN should appear
> + * @return 0 on success, -1 on failure.
> + */
> +int xendevicemodel_add_to_physmap(
> +    xendevicemodel_handle *dmod, domid_t domid, uint64_t idx, uint64_t
> gpfn);
> +
> +/**
>   * This function restricts the use of this handle to the specified
>   * domain.
>   *
> diff --git a/tools/libs/devicemodel/libxendevicemodel.map
> b/tools/libs/devicemodel/libxendevicemodel.map
> index cefd32b..4a19ecb 100644
> --- a/tools/libs/devicemodel/libxendevicemodel.map
> +++ b/tools/libs/devicemodel/libxendevicemodel.map
> @@ -27,3 +27,8 @@ VERS_1.1 {
>       global:
>               xendevicemodel_shutdown;
>  } VERS_1.0;
> +
> +VERS_1.2 {
> +     global:
> +             xendevicemodel_add_to_physmap;
> +} VERS_1.1;
> --
> 2.9.5
> 
> 
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