[PATCH v1 10/12] hw/arm: introduce xenpv machine

[Vikram Garhwal <vikram.garhwal@xxxxxxx>]

Add a new machine xenpv which creates a IOREQ server to register/connect with
Xen Hypervisor.

Xen IOREQ connection expect the TARGET_PAGE_SIZE to 4096, and the xenpv machine
on ARM will have no CPU definitions. We need to define TARGET_PAGE_SIZE
appropriately ourselves.

Optional: When CONFIG_TPM is enabled, it also creates a tpm-tis-device, adds a
TPM emulator and connects to swtpm running on host machine via chardev socket
and support TPM functionalities for a guest domain.

Extra command line for aarch64 xenpv QEMU to connect to swtpm:
    -chardev socket,id=chrtpm,path=/tmp/myvtpm2/swtpm-sock \
    -tpmdev emulator,id=tpm0,chardev=chrtpm \

swtpm implements a TPM software emulator(TPM 1.2 & TPM 2) built on libtpms and
provides access to TPM functionality over socket, chardev and CUSE interface.
Github repo: https://github.com/stefanberger/swtpm
Example for starting swtpm on host machine:
    mkdir /tmp/vtpm2
    swtpm socket --tpmstate dir=/tmp/vtpm2 \
    --ctrl type=unixio,path=/tmp/vtpm2/swtpm-sock &

Signed-off-by: Vikram Garhwal <vikram.garhwal@xxxxxxx>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
---
 hw/arm/meson.build            |   2 +
 hw/arm/xen_arm.c              | 163 ++++++++++++++++++++++++++++++++++
 include/hw/arm/xen_arch_hvm.h |  12 +++
 include/hw/xen/arch_hvm.h     |   2 +
 4 files changed, 179 insertions(+)
 create mode 100644 hw/arm/xen_arm.c
 create mode 100644 include/hw/arm/xen_arch_hvm.h

diff --git a/hw/arm/meson.build b/hw/arm/meson.build
index 92f9f6e000..0cae024374 100644
--- a/hw/arm/meson.build
+++ b/hw/arm/meson.build
@@ -62,5 +62,7 @@ arm_ss.add(when: 'CONFIG_FSL_IMX7', if_true: 
files('fsl-imx7.c', 'mcimx7d-sabre.
 arm_ss.add(when: 'CONFIG_ARM_SMMUV3', if_true: files('smmu-common.c', 
'smmuv3.c'))
 arm_ss.add(when: 'CONFIG_FSL_IMX6UL', if_true: files('fsl-imx6ul.c', 
'mcimx6ul-evk.c'))
 arm_ss.add(when: 'CONFIG_NRF51_SOC', if_true: files('nrf51_soc.c'))
+arm_ss.add(when: 'CONFIG_XEN', if_true: files('xen_arm.c'))
+arm_ss.add_all(xen_ss)
 
 hw_arch += {'arm': arm_ss}
diff --git a/hw/arm/xen_arm.c b/hw/arm/xen_arm.c
new file mode 100644
index 0000000000..0b900314cc
--- /dev/null
+++ b/hw/arm/xen_arm.c
@@ -0,0 +1,163 @@
+/*
+ * QEMU ARM Xen PV Machine
+ *
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to 
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "qapi/qapi-commands-migration.h"
+#include "hw/boards.h"
+#include "hw/sysbus.h"
+#include "sysemu/block-backend.h"
+#include "sysemu/tpm_backend.h"
+#include "sysemu/sysemu.h"
+#include "hw/xen/xen-legacy-backend.h"
+#include "hw/xen/xen-hvm-common.h"
+#include "sysemu/tpm.h"
+#include "hw/xen/arch_hvm.h"
+
+#define TYPE_XEN_ARM  MACHINE_TYPE_NAME("xenpv")
+OBJECT_DECLARE_SIMPLE_TYPE(XenArmState, XEN_ARM)
+
+static MemoryListener xen_memory_listener = {
+    .region_add = xen_region_add,
+    .region_del = xen_region_del,
+    .log_start = NULL,
+    .log_stop = NULL,
+    .log_sync = NULL,
+    .log_global_start = NULL,
+    .log_global_stop = NULL,
+    .priority = 10,
+};
+
+struct XenArmState {
+    /*< private >*/
+    MachineState parent;
+
+    XenIOState *state;
+};
+
+void arch_handle_ioreq(XenIOState *state, ioreq_t *req)
+{
+    hw_error("Invalid ioreq type 0x%x\n", req->type);
+
+    return;
+}
+
+void arch_xen_set_memory(XenIOState *state, MemoryRegionSection *section,
+                         bool add)
+{
+}
+
+void xen_hvm_modified_memory(ram_addr_t start, ram_addr_t length)
+{
+}
+
+void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
+{
+}
+
+static int xen_init_ioreq(XenIOState *state, unsigned int max_cpus)
+{
+    xen_dmod = xendevicemodel_open(0, 0);
+    xen_xc = xc_interface_open(0, 0, 0);
+
+    if (xen_xc == NULL) {
+        perror("xen: can't open xen interface\n");
+        return -1;
+    }
+
+    xen_fmem = xenforeignmemory_open(0, 0);
+    if (xen_fmem == NULL) {
+        perror("xen: can't open xen fmem interface\n");
+        xc_interface_close(xen_xc);
+        return -1;
+    }
+
+    xen_register_ioreq(state, max_cpus, xen_memory_listener);
+
+    xenstore_record_dm_state(xenstore, "running");
+
+    return 0;
+}
+
+static void xen_enable_tpm(void)
+{
+/* qemu_find_tpm_be is only available when CONFIG_TPM is enabled. */
+#ifdef CONFIG_TPM
+    Error *errp = NULL;
+    DeviceState *dev;
+    SysBusDevice *busdev;
+
+    TPMBackend *be = qemu_find_tpm_be("tpm0");
+    if (be == NULL) {
+        DPRINTF("Couldn't fine the backend for tpm0\n");
+        return;
+    }
+    dev = qdev_new(TYPE_TPM_TIS_SYSBUS);
+    object_property_set_link(OBJECT(dev), "tpmdev", OBJECT(be), &errp);
+    object_property_set_str(OBJECT(dev), "tpmdev", be->id, &errp);
+    busdev = SYS_BUS_DEVICE(dev);
+    sysbus_realize_and_unref(busdev, &error_fatal);
+    sysbus_mmio_map(busdev, 0, GUEST_TPM_BASE);
+
+    DPRINTF("Connected tpmdev at address 0x%lx\n", GUEST_TPM_BASE);
+#endif
+}
+
+static void xen_arm_init(MachineState *machine)
+{
+    XenArmState *xam = XEN_ARM(machine);
+
+    xam->state =  g_new0(XenIOState, 1);
+
+    if (xen_init_ioreq(xam->state, machine->smp.cpus)) {
+        return;
+    }
+
+    xen_enable_tpm();
+
+    return;
+}
+
+static void xen_arm_machine_class_init(ObjectClass *oc, void *data)
+{
+
+    MachineClass *mc = MACHINE_CLASS(oc);
+    mc->desc = "Xen Para-virtualized PC";
+    mc->init = xen_arm_init;
+    mc->max_cpus = 1;
+    machine_class_allow_dynamic_sysbus_dev(mc, TYPE_TPM_TIS_SYSBUS);
+}
+
+static const TypeInfo xen_arm_machine_type = {
+    .name = TYPE_XEN_ARM,
+    .parent = TYPE_MACHINE,
+    .class_init = xen_arm_machine_class_init,
+    .instance_size = sizeof(XenArmState),
+};
+
+static void xen_arm_machine_register_types(void)
+{
+    type_register_static(&xen_arm_machine_type);
+}
+
+type_init(xen_arm_machine_register_types)
diff --git a/include/hw/arm/xen_arch_hvm.h b/include/hw/arm/xen_arch_hvm.h
new file mode 100644
index 0000000000..f645dfec28
--- /dev/null
+++ b/include/hw/arm/xen_arch_hvm.h
@@ -0,0 +1,12 @@
+#ifndef HW_XEN_ARCH_ARM_HVM_H
+#define HW_XEN_ARCH_ARM_HVM_H
+
+#include <xen/hvm/ioreq.h>
+void arch_handle_ioreq(XenIOState *state, ioreq_t *req);
+void arch_xen_set_memory(XenIOState *state,
+                         MemoryRegionSection *section,
+                         bool add);
+
+#undef TARGET_PAGE_SIZE
+#define TARGET_PAGE_SIZE 4096
+#endif
diff --git a/include/hw/xen/arch_hvm.h b/include/hw/xen/arch_hvm.h
index 26674648d8..c7c515220d 100644
--- a/include/hw/xen/arch_hvm.h
+++ b/include/hw/xen/arch_hvm.h
@@ -1,3 +1,5 @@
 #if defined(TARGET_I386) || defined(TARGET_X86_64)
 #include "hw/i386/xen_arch_hvm.h"
+#elif defined(TARGET_ARM) || defined(TARGET_ARM_64)
+#include "hw/arm/xen_arch_hvm.h"
 #endif
-- 
2.17.0