Re: [Xen-devel] [PATCH v2] libxc: add xc_domain_remove_from_physmap to wrap XENMEM_remove_from_physmap

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Sat, 19 Aug 2017, Zhongze Liu wrote:
> This is for the proposal "Allow setting up shared memory areas between VMs
> from xl config file". See:
> 
>   https://lists.xenproject.org/archives/html/xen-devel/2017-07/msg03047.html
> 
> Then plan is to use XENMEM_add_to_physmap_batch to map the shared pages from
> one domU to another and use XENMEM_remove_from_physmap to cancel the sharing.
> A wrapper to XENMEM_add_to_physmap_batch was added in the following commit:
> 
>   commit 20e725e9364cff4a29945f66986ecd88cca8743d
> 
> Now add the wrapper to XENMEM_remove_from_physmap.
> 
> Signed-off-by: Zhongze Liu <blackskygg@xxxxxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> Cc: Julien Grall <julien.grall@xxxxxxx>
> Cc: xen-devel@xxxxxxxxxxxxx
> ---
>   v2: add the signed-off message
> ---
>  tools/libxc/include/xenctrl.h |  4 ++++
>  tools/libxc/xc_domain.c       | 11 +++++++++++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
> index c7710b8f36..0ff15a9255 100644
> --- a/tools/libxc/include/xenctrl.h
> +++ b/tools/libxc/include/xenctrl.h
> @@ -1381,6 +1381,10 @@ int xc_domain_add_to_physmap_batch(xc_interface *xch,
>                                     xen_pfn_t *gfpns,
>                                     int *errs);
>  
> +int xc_domain_remove_from_physmap(xc_interface *xch,
> +                                  domid_t domid,
> +                                  xen_pfn_t gpfn);
> +
>  int xc_domain_populate_physmap(xc_interface *xch,
>                                 uint32_t domid,
>                                 unsigned long nr_extents,
> diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
> index 3bab4e8bab..e6b32792c0 100644
> --- a/tools/libxc/xc_domain.c
> +++ b/tools/libxc/xc_domain.c
> @@ -1077,6 +1077,17 @@ out:
>      return rc;
>  }
>  
> +int xc_domain_remove_from_physmap(xc_interface *xch,
> +                                  domid_t domid,
> +                                  xen_pfn_t gpfn)
> +{
> +    struct xen_remove_from_physmap xrfp = {
> +        .domid = domid,
> +        .gpfn = gpfn,
> +    };
> +    return do_memory_op(xch, XENMEM_remove_from_physmap, &xrfp, 
> sizeof(xrfp));
> +}
> +
>  int xc_domain_claim_pages(xc_interface *xch,
>                                 uint32_t domid,
>                                 unsigned long nr_pages)
> -- 
> 2.14.0
> 

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