Re: [Xen-devel] [PATCH v10 1/3] ioreq-server: add support for multiple servers

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.05.14 at 12:38, <paul.durrant@xxxxxxxxxx> wrote:
> The previous single ioreq server that was created on demand now
> becomes the default server and an API is created to allow secondary
> servers, which handle specific IO ranges or PCI devices, to be added.
> 
> When the guest issues an IO the list of secondary servers is checked
> for a matching IO range or PCI device. If none is found then the IO
> is passed to the default server.
> 
> Secondary servers use guest pages to communicate with emulators, in
> the same way as the default server. These pages need to be in the
> guest physmap otherwise there is no suitable reference that can be
> queried by an emulator in order to map them. Therefore a pool of
> pages in the current E820 reserved region, just below the special
> pages is used. Secondary servers allocate from and free to this pool
> as they are created and destroyed.
> 
> The size of the pool is currently hardcoded in the domain build at a
> value of 8. This should be sufficient for now and both the location and
> size of the pool can be modified in future without any need to change the
> API.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> ---
>  tools/libxc/xc_domain.c          |  224 ++++++++++
>  tools/libxc/xc_domain_restore.c  |   48 ++
>  tools/libxc/xc_domain_save.c     |   24 +
>  tools/libxc/xc_hvm_build_x86.c   |   50 ++-
>  tools/libxc/xc_private.c         |   16 +-
>  tools/libxc/xenctrl.h            |  143 +++++-
>  tools/libxc/xg_save_restore.h    |    3 +
>  xen/arch/x86/hvm/hvm.c           |  908 
> ++++++++++++++++++++++++++++++++++----
>  xen/arch/x86/hvm/io.c            |    2 +-
>  xen/include/asm-x86/hvm/domain.h |   26 +-
>  xen/include/asm-x86/hvm/hvm.h    |    1 +
>  xen/include/public/hvm/hvm_op.h  |  120 +++++
>  xen/include/public/hvm/ioreq.h   |    9 +-
>  xen/include/public/hvm/params.h  |    5 +-
>  xen/include/xen/list.h           |    9 +
>  xen/include/xsm/dummy.h          |    6 +
>  xen/include/xsm/xsm.h            |    6 +
>  xen/xsm/flask/hooks.c            |    6 +
>  18 files changed, 1497 insertions(+), 109 deletions(-)

So I was about to apply this when I noticed the still missing ack from
Daniel on the XSM changes - you didn't even Cc him (now done).

Jan


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