[PATCH v7 14/15] tools/libxc: add support to altp2m hvmops

[Ed White <edmund.h.white@intel.com>]

From: Tamas K Lengyel <tlengyel@novetta.com>

Wrappers to issue altp2m hvmops.

Signed-off-by: Tamas K Lengyel <tlengyel@novetta.com>
Signed-off-by: Ravi Sahita <ravi.sahita@intel.com>

Acked-by: Ian Campbell <ian.campbell@citrix.com>
---
Changes since v6:
        no changes

 tools/libxc/Makefile          |   1 +
 tools/libxc/include/xenctrl.h |  22 ++++
 tools/libxc/xc_altp2m.c       | 248 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 271 insertions(+)
 create mode 100644 tools/libxc/xc_altp2m.c

diff --git a/tools/libxc/Makefile b/tools/libxc/Makefile
index 1aec848..b0a3e05 100644
--- a/tools/libxc/Makefile
+++ b/tools/libxc/Makefile
@@ -10,6 +10,7 @@ override CONFIG_MIGRATE := n
 endif
 
 CTRL_SRCS-y       :=
+CTRL_SRCS-y       += xc_altp2m.c
 CTRL_SRCS-y       += xc_core.c
 CTRL_SRCS-$(CONFIG_X86) += xc_core_x86.c
 CTRL_SRCS-$(CONFIG_ARM) += xc_core_arm.c
diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index ce9029c..f869390 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -2304,6 +2304,28 @@ void xc_tmem_save_done(xc_interface *xch, int dom);
 int xc_tmem_restore(xc_interface *xch, int dom, int fd);
 int xc_tmem_restore_extra(xc_interface *xch, int dom, int fd);
 
+/**
+ * altp2m operations
+ */
+
+int xc_altp2m_get_domain_state(xc_interface *handle, domid_t dom, bool *state);
+int xc_altp2m_set_domain_state(xc_interface *handle, domid_t dom, bool state);
+int xc_altp2m_set_vcpu_enable_notify(xc_interface *handle, domid_t domid,
+                                     uint32_t vcpuid, xen_pfn_t gfn);
+int xc_altp2m_create_view(xc_interface *handle, domid_t domid,
+                          xenmem_access_t default_access, uint16_t *view_id);
+int xc_altp2m_destroy_view(xc_interface *handle, domid_t domid,
+                           uint16_t view_id);
+/* Switch all vCPUs of the domain to the specified altp2m view */
+int xc_altp2m_switch_to_view(xc_interface *handle, domid_t domid,
+                             uint16_t view_id);
+int xc_altp2m_set_mem_access(xc_interface *handle, domid_t domid,
+                             uint16_t view_id, xen_pfn_t gfn,
+                             xenmem_access_t access);
+int xc_altp2m_change_gfn(xc_interface *handle, domid_t domid,
+                         uint16_t view_id, xen_pfn_t old_gfn,
+                         xen_pfn_t new_gfn);
+
 /** 
  * Mem paging operations.
  * Paging is supported only on the x86 architecture in 64 bit mode, with
diff --git a/tools/libxc/xc_altp2m.c b/tools/libxc/xc_altp2m.c
new file mode 100644
index 0000000..0f3c5ed
--- /dev/null
+++ b/tools/libxc/xc_altp2m.c
@@ -0,0 +1,248 @@
+/******************************************************************************
+ *
+ * xc_altp2m.c
+ *
+ * Interface to altp2m related HVMOPs
+ *
+ * Copyright (c) 2015 Tamas K Lengyel (tamas@tklengyel.com)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "xc_private.h"
+#include <stdbool.h>
+#include <xen/hvm/hvm_op.h>
+
+int xc_altp2m_get_domain_state(xc_interface *handle, domid_t dom, bool *state)
+{
+    int rc;
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(xen_hvm_altp2m_op_t, arg);
+
+    arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
+    if ( arg == NULL )
+        return -1;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_altp2m;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+    arg->version = HVMOP_ALTP2M_INTERFACE_VERSION;
+    arg->cmd = HVMOP_altp2m_get_domain_state;
+    arg->domain = dom;
+
+    rc = do_xen_hypercall(handle, &hypercall);
+
+    if ( !rc )
+        *state = arg->u.domain_state.state;
+
+    xc_hypercall_buffer_free(handle, arg);
+    return rc;
+}
+
+int xc_altp2m_set_domain_state(xc_interface *handle, domid_t dom, bool state)
+{
+    int rc;
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(xen_hvm_altp2m_op_t, arg);
+
+    arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
+    if ( arg == NULL )
+        return -1;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_altp2m;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+    arg->version = HVMOP_ALTP2M_INTERFACE_VERSION;
+    arg->cmd = HVMOP_altp2m_set_domain_state;
+    arg->domain = dom;
+    arg->u.domain_state.state = state;
+
+    rc = do_xen_hypercall(handle, &hypercall);
+
+    xc_hypercall_buffer_free(handle, arg);
+    return rc;
+}
+
+/* This is a bit odd to me that it acts on current.. */
+int xc_altp2m_set_vcpu_enable_notify(xc_interface *handle, domid_t domid,
+                                     uint32_t vcpuid, xen_pfn_t gfn)
+{
+    int rc;
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(xen_hvm_altp2m_op_t, arg);
+
+    arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
+    if ( arg == NULL )
+        return -1;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_altp2m;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+    arg->version = HVMOP_ALTP2M_INTERFACE_VERSION;
+    arg->cmd = HVMOP_altp2m_vcpu_enable_notify;
+    arg->domain = domid;
+    arg->u.enable_notify.vcpu_id = vcpuid;
+    arg->u.enable_notify.gfn = gfn;
+
+    rc = do_xen_hypercall(handle, &hypercall);
+
+    xc_hypercall_buffer_free(handle, arg);
+    return rc;
+}
+
+int xc_altp2m_create_view(xc_interface *handle, domid_t domid,
+                          xenmem_access_t default_access, uint16_t *view_id)
+{
+    int rc;
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(xen_hvm_altp2m_op_t, arg);
+
+    arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
+    if ( arg == NULL )
+        return -1;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_altp2m;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+    arg->version = HVMOP_ALTP2M_INTERFACE_VERSION;
+    arg->cmd = HVMOP_altp2m_create_p2m;
+    arg->domain = domid;
+    arg->u.view.view = -1;
+    arg->u.view.hvmmem_default_access = default_access;
+
+    rc = do_xen_hypercall(handle, &hypercall);
+
+    if ( !rc )
+        *view_id = arg->u.view.view;
+
+    xc_hypercall_buffer_free(handle, arg);
+    return rc;
+}
+
+int xc_altp2m_destroy_view(xc_interface *handle, domid_t domid,
+                           uint16_t view_id)
+{
+    int rc;
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(xen_hvm_altp2m_op_t, arg);
+
+    arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
+    if ( arg == NULL )
+        return -1;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_altp2m;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+    arg->version = HVMOP_ALTP2M_INTERFACE_VERSION;
+    arg->cmd = HVMOP_altp2m_destroy_p2m;
+    arg->domain = domid;
+    arg->u.view.view = view_id;
+
+    rc = do_xen_hypercall(handle, &hypercall);
+
+    xc_hypercall_buffer_free(handle, arg);
+    return rc;
+}
+
+/* Switch all vCPUs of the domain to the specified altp2m view */
+int xc_altp2m_switch_to_view(xc_interface *handle, domid_t domid,
+                             uint16_t view_id)
+{
+    int rc;
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(xen_hvm_altp2m_op_t, arg);
+
+    arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
+    if ( arg == NULL )
+        return -1;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_altp2m;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+    arg->version = HVMOP_ALTP2M_INTERFACE_VERSION;
+    arg->cmd = HVMOP_altp2m_switch_p2m;
+    arg->domain = domid;
+    arg->u.view.view = view_id;
+
+    rc = do_xen_hypercall(handle, &hypercall);
+
+    xc_hypercall_buffer_free(handle, arg);
+    return rc;
+}
+
+int xc_altp2m_set_mem_access(xc_interface *handle, domid_t domid,
+                             uint16_t view_id, xen_pfn_t gfn,
+                             xenmem_access_t access)
+{
+    int rc;
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(xen_hvm_altp2m_op_t, arg);
+
+    arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
+    if ( arg == NULL )
+        return -1;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_altp2m;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+    arg->version = HVMOP_ALTP2M_INTERFACE_VERSION;
+    arg->cmd = HVMOP_altp2m_set_mem_access;
+    arg->domain = domid;
+    arg->u.set_mem_access.view = view_id;
+    arg->u.set_mem_access.hvmmem_access = access;
+    arg->u.set_mem_access.gfn = gfn;
+
+    rc = do_xen_hypercall(handle, &hypercall);
+
+    xc_hypercall_buffer_free(handle, arg);
+    return rc;
+}
+
+int xc_altp2m_change_gfn(xc_interface *handle, domid_t domid,
+                         uint16_t view_id, xen_pfn_t old_gfn,
+                         xen_pfn_t new_gfn)
+{
+    int rc;
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(xen_hvm_altp2m_op_t, arg);
+
+    arg = xc_hypercall_buffer_alloc(handle, arg, sizeof(*arg));
+    if ( arg == NULL )
+        return -1;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_altp2m;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+    arg->version = HVMOP_ALTP2M_INTERFACE_VERSION;
+    arg->cmd = HVMOP_altp2m_change_gfn;
+    arg->domain = domid;
+    arg->u.change_gfn.view = view_id;
+    arg->u.change_gfn.old_gfn = old_gfn;
+    arg->u.change_gfn.new_gfn = new_gfn;
+
+    rc = do_xen_hypercall(handle, &hypercall);
+
+    xc_hypercall_buffer_free(handle, arg);
+    return rc;
+}
+
-- 
1.9.1