From: Cornelia Huck <cohuck@redhat.com>
To: Farhan Ali <alifm@linux.ibm.com>
Cc: farman@linux.ibm.com, pasic@linux.ibm.com,
linux-s390@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [RFC v2 5/5] vfio-ccw: Update documentation for csch/hsch
Date: Tue, 9 Jul 2019 12:14:45 +0200 [thread overview]
Message-ID: <20190709121445.1d7bf8ed.cohuck@redhat.com> (raw)
In-Reply-To: <df21c81e3d40144c103f1dfdf856853552990c05.1562616169.git.alifm@linux.ibm.com>
On Mon, 8 Jul 2019 16:10:38 -0400
Farhan Ali <alifm@linux.ibm.com> wrote:
> We now support CLEAR SUBCHANNEL and HALT SUBCHANNEL
> via ccw_cmd_region.
>
Thanks, I forgot about this.
Fixes: d5afd5d135c8 ("vfio-ccw: add handling for async channel instructions")
> Signed-off-by: Farhan Ali <alifm@linux.ibm.com>
> ---
> Documentation/s390/vfio-ccw.rst | 31 ++++++++++++++++++++++++++++---
> 1 file changed, 28 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/s390/vfio-ccw.rst b/Documentation/s390/vfio-ccw.rst
> index 1f6d0b5..40e4110 100644
> --- a/Documentation/s390/vfio-ccw.rst
> +++ b/Documentation/s390/vfio-ccw.rst
> @@ -180,6 +180,13 @@ The process of how these work together.
> add it to an iommu_group and a vfio_group. Then we could pass through
> the mdev to a guest.
>
> +
> +VFIO-CCW Regions
> +----------------
> +
> +The vfio-ccw driver exposes MMIO regions to accept requests from and return
> +results to userspace.
> +
> vfio-ccw I/O region
> -------------------
>
> @@ -205,6 +212,25 @@ irb_area stores the I/O result.
>
> ret_code stores a return code for each access of the region.
>
> +This region is always available.
> +
> +vfio-ccw cmd region
> +-------------------
> +
> +The vfio-ccw cmd region is used to accept asynchronous instructions
> +from userspace.
> +
> +#define VFIO_CCW_ASYNC_CMD_HSCH (1 << 0)
> +#define VFIO_CCW_ASYNC_CMD_CSCH (1 << 1)
> +struct ccw_cmd_region {
> + __u32 command;
> + __u32 ret_code;
> +} __packed;
> +
> +This region is exposed via region type VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD.
> +
> +CLEAR SUBCHANNEL and HALT SUBCHANNEL currently uses this region.
"Currently, CLEAR SUBCHANNEL and HALT SUBCHANNEL use this region". ?
> +
> vfio-ccw operation details
> --------------------------
>
> @@ -306,9 +332,8 @@ Together with the corresponding work in QEMU, we can bring the passed
> through DASD/ECKD device online in a guest now and use it as a block
> device.
>
> -While the current code allows the guest to start channel programs via
> -START SUBCHANNEL, support for HALT SUBCHANNEL or CLEAR SUBCHANNEL is
> -not yet implemented.
> +The current code allows the guest to start channel programs via
> +START SUBCHANNEL, and supports HALT SUBCHANNEL or CLEAR SUBCHANNEL.
"The current code allows the guest to start channel programs via START
SUBCHANNEL, and to issue HALT SUBCHANNEL and CLEAR SUBCHANNEL." ?
>
> vfio-ccw supports classic (command mode) channel I/O only. Transport
> mode (HPF) is not supported.
next prev parent reply other threads:[~2019-07-09 10:14 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-08 20:10 [RFC v2 0/5] Some vfio-ccw fixes Farhan Ali
2019-07-08 20:10 ` [RFC v2 1/5] vfio-ccw: Fix misleading comment when setting orb.cmd.c64 Farhan Ali
2019-07-09 9:57 ` Cornelia Huck
2019-07-08 20:10 ` [RFC v2 2/5] vfio-ccw: Fix memory leak and don't call cp_free in cp_init Farhan Ali
2019-07-09 10:06 ` Cornelia Huck
2019-07-09 14:07 ` Farhan Ali
2019-07-09 14:18 ` Cornelia Huck
2019-07-08 20:10 ` [RFC v2 3/5] vfio-ccw: Set pa_nr to 0 if memory allocation fails for pa_iova_pfn Farhan Ali
2019-07-09 10:08 ` Cornelia Huck
2019-07-08 20:10 ` [RFC v2 4/5] vfio-ccw: Don't call cp_free if we are processing a channel program Farhan Ali
2019-07-09 10:16 ` Cornelia Huck
2019-07-09 13:46 ` Farhan Ali
2019-07-09 14:21 ` Halil Pasic
2019-07-09 21:27 ` Farhan Ali
2019-07-10 13:45 ` Cornelia Huck
2019-07-10 16:10 ` Farhan Ali
2019-07-11 12:28 ` Eric Farman
2019-07-11 14:57 ` Halil Pasic
2019-07-11 20:09 ` Eric Farman
2019-07-12 13:59 ` Halil Pasic
2019-07-08 20:10 ` [RFC v2 5/5] vfio-ccw: Update documentation for csch/hsch Farhan Ali
2019-07-09 10:14 ` Cornelia Huck [this message]
2019-07-09 12:47 ` Farhan Ali
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190709121445.1d7bf8ed.cohuck@redhat.com \
--to=cohuck@redhat.com \
--cc=alifm@linux.ibm.com \
--cc=farman@linux.ibm.com \
--cc=kvm@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=pasic@linux.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).