Re: [Xen-devel] [PATCH RFC] libxc: Document xc_domain_resume

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Feb 29, 2016 at 02:59:26PM -0500, Konrad Rzeszutek Wilk wrote:
> Document the save and suspend mechanism.
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> ---
>  tools/libxc/include/xenctrl.h | 52 
> +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 52 insertions(+)
> 
> diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
> index 150d727..9778947 100644
> --- a/tools/libxc/include/xenctrl.h
> +++ b/tools/libxc/include/xenctrl.h
> @@ -565,6 +565,58 @@ int xc_domain_destroy(xc_interface *xch,
>   * This function resumes a suspended domain. The domain should have
>   * been previously suspended.
>   *
> + * Note that there are 'xc_domain_suspend' as suspending a domain
> + * is quite the endeavour. As such this long comment will describe the
> + * suspend and resume path.
> + *
> + * For the purpose of this explanation there are three guests:
> + * PV (using hypercalls for privilgied operations), HVM
> + * (fully hardware virtualized guests using emulated devices for everything),
> + * and PVHVM (hardware virtualized guest with PV drivers).
> + *
> + * HVM guest are the simplest - they suspend via S3 and resume from
> + * S3. Upon resume they have to re-negotiate with the emulated devices.
> + *
> + * PV and PVHVM communate via via hypercalls for suspend (and resume).

"communicate"?

Wei.

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