Re: [PATCH V4 04/13] hyperv: Mark vmbus ring buffer visible to host in Isolation VM

[Greg KH <gregkh@linuxfoundation.org>]

On Fri, Aug 27, 2021 at 01:21:02PM -0400, Tianyu Lan wrote:
> From: Tianyu Lan <Tianyu.Lan@microsoft.com>
> 
> Mark vmbus ring buffer visible with set_memory_decrypted() when
> establish gpadl handle.
> 
> Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
> ---
> Change since v3:
>        * Change vmbus_teardown_gpadl() parameter and put gpadl handle,
>        buffer and buffer size in the struct vmbus_gpadl.
> ---
>  drivers/hv/channel.c            | 36 ++++++++++++++++++++++++++++-----
>  drivers/net/hyperv/hyperv_net.h |  1 +
>  drivers/net/hyperv/netvsc.c     | 16 +++++++++++----
>  drivers/uio/uio_hv_generic.c    | 14 +++++++++++--
>  include/linux/hyperv.h          |  8 +++++++-
>  5 files changed, 63 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
> index f3761c73b074..82650beb3af0 100644
> --- a/drivers/hv/channel.c
> +++ b/drivers/hv/channel.c
> @@ -17,6 +17,7 @@
>  #include <linux/hyperv.h>
>  #include <linux/uio.h>
>  #include <linux/interrupt.h>
> +#include <linux/set_memory.h>
>  #include <asm/page.h>
>  #include <asm/mshyperv.h>
>  
> @@ -474,6 +475,13 @@ static int __vmbus_establish_gpadl(struct vmbus_channel *channel,
>  	if (ret)
>  		return ret;
>  
> +	ret = set_memory_decrypted((unsigned long)kbuffer,
> +				   HVPFN_UP(size));
> +	if (ret) {
> +		pr_warn("Failed to set host visibility for new GPADL %d.\n", ret);

dev_warn()?  You have access to a struct device, why not use it?

same for all other instances here.

thanks,

greg k-h