[Xen-devel] [RFC PATCH 1/7] common/pv-iommu: Add stub hypercall for PV-IOMMU

[Malcolm Crossley <malcolm.crossley@xxxxxxxxxx>]

Signed-off-by: Malcolm Crossley <malcolm.crossley@xxxxxxxxxx>
--
Cc: jbeulich@xxxxxxxx
Cc: andrew.cooper3@xxxxxxxxxx
Cc: ian.campbell@xxxxxxxxxx
Cc: keir@xxxxxxx
Cc: tim@xxxxxxx
Cc: xen-devel@xxxxxxxxxxxxx
---
 xen/arch/x86/x86_64/compat/entry.S |  2 ++
 xen/arch/x86/x86_64/entry.S        |  2 ++
 xen/common/Makefile                |  1 +
 xen/common/pv_iommu.c              | 38 ++++++++++++++++++++++++++++++++++++++
 xen/include/public/xen.h           |  1 +
 5 files changed, 44 insertions(+)
 create mode 100644 xen/common/pv_iommu.c

diff --git a/xen/arch/x86/x86_64/compat/entry.S 
b/xen/arch/x86/x86_64/compat/entry.S
index 3088aa7..53a1689 100644
--- a/xen/arch/x86/x86_64/compat/entry.S
+++ b/xen/arch/x86/x86_64/compat/entry.S
@@ -436,6 +436,7 @@ ENTRY(compat_hypercall_table)
         .quad do_tmem_op
         .quad do_ni_hypercall           /* reserved for XenClient */
         .quad do_xenpmu_op              /* 40 */
+        .quad do_iommu_op
         .rept __HYPERVISOR_arch_0-((.-compat_hypercall_table)/8)
         .quad compat_ni_hypercall
         .endr
@@ -487,6 +488,7 @@ ENTRY(compat_hypercall_args_table)
         .byte 1 /* do_tmem_op               */
         .byte 0 /* reserved for XenClient   */
         .byte 2 /* do_xenpmu_op             */  /* 40 */
+        .byte 2 /* do_iommu_op              */
         .rept __HYPERVISOR_arch_0-(.-compat_hypercall_args_table)
         .byte 0 /* compat_ni_hypercall      */
         .endr
diff --git a/xen/arch/x86/x86_64/entry.S b/xen/arch/x86/x86_64/entry.S
index 94a54aa..fee7191 100644
--- a/xen/arch/x86/x86_64/entry.S
+++ b/xen/arch/x86/x86_64/entry.S
@@ -769,6 +769,7 @@ ENTRY(hypercall_table)
         .quad do_tmem_op
         .quad do_ni_hypercall       /* reserved for XenClient */
         .quad do_xenpmu_op          /* 40 */
+        .quad do_iommu_op
         .rept __HYPERVISOR_arch_0-((.-hypercall_table)/8)
         .quad do_ni_hypercall
         .endr
@@ -820,6 +821,7 @@ ENTRY(hypercall_args_table)
         .byte 1 /* do_tmem_op           */
         .byte 0 /* reserved for XenClient */
         .byte 2 /* do_xenpmu_op         */  /* 40 */
+        .byte 2 /* do_iommu_op          */
         .rept __HYPERVISOR_arch_0-(.-hypercall_args_table)
         .byte 0 /* do_ni_hypercall      */
         .endr
diff --git a/xen/common/Makefile b/xen/common/Makefile
index 6e82b33..b498589 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -25,6 +25,7 @@ obj-y += notifier.o
 obj-y += page_alloc.o
 obj-$(CONFIG_HAS_PDX) += pdx.o
 obj-y += preempt.o
+obj-y += pv_iommu.o
 obj-y += random.o
 obj-y += rangeset.o
 obj-y += radix-tree.o
diff --git a/xen/common/pv_iommu.c b/xen/common/pv_iommu.c
new file mode 100644
index 0000000..304fccf
--- /dev/null
+++ b/xen/common/pv_iommu.c
@@ -0,0 +1,38 @@
+/******************************************************************************
+ * common/pv_iommu.c
+ * 
+ * Paravirtualised IOMMU functionality
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <xen/guest_access.h>
+
+#define ret_t long
+
+ret_t do_iommu_op(XEN_GUEST_HANDLE_PARAM(void) arg, unsigned int count)
+{
+    return -ENOSYS;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
+
diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index 7b629b1..ff50e7a 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -102,6 +102,7 @@ DEFINE_XEN_GUEST_HANDLE(xen_ulong_t);
 #define __HYPERVISOR_tmem_op              38
 #define __HYPERVISOR_xc_reserved_op       39 /* reserved for XenClient */
 #define __HYPERVISOR_xenpmu_op            40
+#define __HYPERVISOR_iommu_op             41
 
 /* Architecture-specific hypercall definitions. */
 #define __HYPERVISOR_arch_0               48
-- 
1.7.12.4


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