[PATCH 01/26] xen: Provide XEN_DMOP_remote_shutdown

From: Ian Jackson <ian.jackson@eu.citrix.com>
To: xen-devel@lists.xensource.com
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	Wei Liu <wei.liu2@citrix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	George Dunlap <George.Dunlap@eu.citrix.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Ian Jackson <Ian.Jackson@eu.citrix.com>, Tim Deegan <tim@xen.org>,
	Ross Lagerwall <ross.lagerwall@citrix.com>,
	Jan Beulich <jbeulich@suse.com>
Subject: [PATCH 01/26] xen: Provide XEN_DMOP_remote_shutdown
Date: Mon, 9 Oct 2017 16:57:03 +0100	[thread overview]
Message-ID: <1507564648-7580-2-git-send-email-ian.jackson@eu.citrix.com> (raw)
In-Reply-To: <1507564648-7580-1-git-send-email-ian.jackson@eu.citrix.com>

SCHEDOP_remote_shutdown should be a DMOP so that a deprivileged qemu
can do the propery tidying up.

We need to keep SCHEDOP_remote_shutdown for ABI stability reasons and
because it is needed for PV guests.

CC: Jan Beulich <jbeulich@suse.com>
CC: Andrew Cooper <andrew.cooper3@citrix.com>
CC: George Dunlap <George.Dunlap@eu.citrix.com>
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Tim Deegan <tim@xen.org>
CC: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>

---
v2: Coding style: add blank line in switch statement.
    Correct commit message re reasons to keep SCHEDOP_remote_shutdown.
    Add to xlat.lst in alphabetical order wrt to other dm_ops.

Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
---
 xen/arch/x86/hvm/dm.c          | 10 ++++++++++
 xen/include/public/hvm/dm_op.h | 12 ++++++++++++
 xen/include/xlat.lst           |  1 +
 3 files changed, 23 insertions(+)

diff --git a/xen/arch/x86/hvm/dm.c b/xen/arch/x86/hvm/dm.c
index 9cf53b5..acabde1 100644
--- a/xen/arch/x86/hvm/dm.c
+++ b/xen/arch/x86/hvm/dm.c
@@ -629,6 +629,15 @@ static int dm_op(const struct dmop_args *op_args)
         break;
     }
 
+    case XEN_DMOP_remote_shutdown:
+    {
+        const struct xen_dm_op_remote_shutdown *data =
+            &op.u.remote_shutdown;
+
+        domain_shutdown(d, data->reason);
+        break;
+    }
+
     default:
         rc = -EOPNOTSUPP;
         break;
@@ -657,6 +666,7 @@ CHECK_dm_op_modified_memory;
 CHECK_dm_op_set_mem_type;
 CHECK_dm_op_inject_event;
 CHECK_dm_op_inject_msi;
+CHECK_dm_op_remote_shutdown;
 
 int compat_dm_op(domid_t domid,
                  unsigned int nr_bufs,
diff --git a/xen/include/public/hvm/dm_op.h b/xen/include/public/hvm/dm_op.h
index 6bbab5f..e173085 100644
--- a/xen/include/public/hvm/dm_op.h
+++ b/xen/include/public/hvm/dm_op.h
@@ -357,6 +357,17 @@ struct xen_dm_op_map_mem_type_to_ioreq_server {
                            has to be set to zero by the caller */
 };
 
+/*
+ * XEN_DMOP_remote_shutdown : Declare a shutdown for another domain
+ *                            Identical to SCHEDOP_remote_shutdown
+ */
+#define XEN_DMOP_remote_shutdown 16
+
+struct xen_dm_op_remote_shutdown {
+    uint32_t reason;       /* SHUTDOWN_* => enum sched_shutdown_reason */
+                           /* (Other reason values are not blocked) */
+};
+
 struct xen_dm_op {
     uint32_t op;
     uint32_t pad;
@@ -377,6 +388,7 @@ struct xen_dm_op {
         struct xen_dm_op_inject_msi inject_msi;
         struct xen_dm_op_map_mem_type_to_ioreq_server
                 map_mem_type_to_ioreq_server;
+        struct xen_dm_op_remote_shutdown remote_shutdown;
     } u;
 };
 
diff --git a/xen/include/xlat.lst b/xen/include/xlat.lst
index 0f17000..4346cbe 100644
--- a/xen/include/xlat.lst
+++ b/xen/include/xlat.lst
@@ -64,6 +64,7 @@
 ?	dm_op_inject_msi		hvm/dm_op.h
 ?	dm_op_ioreq_server_range	hvm/dm_op.h
 ?	dm_op_modified_memory		hvm/dm_op.h
+?	dm_op_remote_shutdown		hvm/dm_op.h
 ?	dm_op_set_ioreq_server_state	hvm/dm_op.h
 ?	dm_op_set_isa_irq_level		hvm/dm_op.h
 ?	dm_op_set_mem_type		hvm/dm_op.h
-- 
2.1.4


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