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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 6/8] libxl: allow a generation ID to be specified at domain creation
Toolstacks may specify a VM generation ID using the u.hvm.ms_vm_genid
field in the libxl_domain_build_info structure, when creating a
domain.
The toolstack is responsible for providing the correct generation ID
according to the Microsoft specification (e.g., generating new random
ones with libxl_ms_vm_genid_generate() as appropriate when restoring).
Although the specification requires that a ACPI Notify event is raised
if the generation ID is changed, the generation ID is never changed
when the domain is in a state to receive such an event (it's either
newly created or suspended).
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
tools/libxl/Makefile | 1 +
tools/libxl/libxl.h | 7 +++
tools/libxl/libxl_dom.c | 10 ++++
tools/libxl/libxl_genid.c | 104 ++++++++++++++++++++++++++++++++++++++++++
tools/libxl/libxl_internal.h | 4 ++
tools/libxl/libxl_types.idl | 2 +
6 files changed, 128 insertions(+)
create mode 100644 tools/libxl/libxl_genid.c
diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index 4cfa275..6499aa7 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -77,6 +77,7 @@ LIBXL_OBJS = flexarray.o libxl.o libxl_create.o libxl_dm.o
libxl_pci.o \
libxl_json.o libxl_aoutils.o libxl_numa.o \
libxl_save_callout.o _libxl_save_msgs_callout.o \
libxl_qmp.o libxl_event.o libxl_fork.o $(LIBXL_OBJS-y)
+LIBXL_OBJS += libxl_genid.o
LIBXL_OBJS += _libxl_types.o libxl_flask.o _libxl_types_internal.o
LIBXL_TESTS += timedereg
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 17b8a7b..ab2f66a 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -104,6 +104,11 @@
#define LIBXL_HAVE_BUILDINFO_EVENT_CHANNELS 1
/*
+ * libxl_domain_build_info has the u.hvm.ms_vm_genid field.
+ */
+#define LIBXL_HAVE_BUILDINFO_HVM_MS_VM_GENID 1
+
+/*
* LIBXL_HAVE_DEVICE_DISK_DIRECT_IO_SAFE indicates that a
* 'direct_io_safe' field (of boolean type) is present in
* libxl_device_disk.
@@ -1189,6 +1194,8 @@ int libxl_flask_getenforce(libxl_ctx *ctx);
int libxl_flask_setenforce(libxl_ctx *ctx, int mode);
int libxl_flask_loadpolicy(libxl_ctx *ctx, void *policy, uint32_t size);
+int libxl_ms_vm_genid_generate(libxl_ctx *ctx, libxl_uuid *uuid);
+
/* misc */
/* Each of these sets or clears the flag according to whether the
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index 8485488..21ce07f 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -314,6 +314,16 @@ int libxl__build_post(libxl__gc *gc, uint32_t domid,
if (info->cpuid != NULL)
libxl_cpuid_set(ctx, domid, info->cpuid);
+ if (info->type == LIBXL_DOMAIN_TYPE_HVM
+ && !libxl_uuid_is_nil(&info->u.hvm.ms_vm_genid)) {
+ rc = libxl__ms_vm_genid_set(gc, domid,
+ &info->u.hvm.ms_vm_genid);
+ if (rc) {
+ LOG(ERROR, "Failed to set VM Generation ID");
+ return rc;
+ }
+ }
+
ents = libxl__calloc(gc, 12 + (info->max_vcpus * 2) + 2, sizeof(char *));
ents[0] = "memory/static-max";
ents[1] = GCSPRINTF("%"PRId64, info->max_memkb);
diff --git a/tools/libxl/libxl_genid.c b/tools/libxl/libxl_genid.c
new file mode 100644
index 0000000..565ed00
--- /dev/null
+++ b/tools/libxl/libxl_genid.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2014 Citrix Systems R&D Ltd.
+ *
+ * This program 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; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * 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 Lesser General Public License for more details.
+ */
+
+#include "libxl_osdeps.h" /* must come before any other headers */
+
+#include "libxl_internal.h"
+
+#include <xenctrl.h>
+#include <xen/hvm/params.h>
+
+/*
+ * Generate a random VM generation ID.
+ *
+ * This is similar to libxl_uuid_generate() except that all bits are
+ * random, as required by the specification.
+ *
+ * Returns ERROR_FAIL if a suitable source of random numbers is not
+ * available.
+ *
+ * See Microsoft's "Virtual Machine Generation ID" specification for
+ * further details, including when a new generation ID is required.
+ *
+ * http://www.microsoft.com/en-us/download/details.aspx?id=30707
+ */
+int libxl_ms_vm_genid_generate(libxl_ctx *ctx, libxl_uuid *uuid)
+{
+ GC_INIT(ctx);
+ int ret;
+
+ ret = libxl__random_bytes(gc, libxl_uuid_bytearray(uuid), 16);
+
+ GC_FREE;
+ return ret;
+}
+
+int libxl__ms_vm_genid_set(libxl__gc *gc, uint32_t domid,
+ const libxl_uuid *uuid)
+{
+ libxl_ctx *ctx = libxl__gc_owner(gc);
+ const char *dom_path;
+ uint64_t genid[2];
+ uint64_t paddr = 0;
+ int rc;
+
+ memcpy(genid, libxl_uuid_bytearray_const(uuid), 16);
+
+ /*
+ * Set the "platform/generation-id" XenStore key to pass the ID to
+ * hvmloader.
+ */
+ dom_path = libxl__xs_get_dompath(gc, domid);
+ if (!dom_path) {
+ rc = ERROR_FAIL;
+ goto out;
+ }
+ rc = libxl__xs_write(gc, XBT_NULL,
+ GCSPRINTF("%s/platform/generation-id", dom_path),
+ "%"PRIu64 ":%" PRIu64, genid[0], genid[1]);
+ if (rc < 0)
+ goto out;
+
+ /*
+ * Update the ID in guest memory (if available).
+ */
+ xc_get_hvm_param(ctx->xch, domid, HVM_PARAM_VM_GENERATION_ID_ADDR, &paddr);
+ if (paddr) {
+ void *vaddr;
+
+ vaddr = xc_map_foreign_range(ctx->xch, domid, XC_PAGE_SIZE,
+ PROT_READ | PROT_WRITE,
+ paddr >> XC_PAGE_SHIFT);
+ if (vaddr == NULL) {
+ rc = ERROR_FAIL;
+ goto out;
+ }
+ memcpy(vaddr + (paddr & ~XC_PAGE_MASK), genid, 2 * sizeof(*genid));
+ munmap(vaddr, XC_PAGE_SIZE);
+
+ /*
+ * The spec requires an ACPI Notify event is injected into the
+ * guest when the generation ID is changed.
+ *
+ * This is only called for domains that are suspended or newly
+ * created and they won't be in a state to receive such an
+ * event.
+ */
+ }
+
+ rc = 0;
+
+ out:
+ return rc;
+}
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index d4f32a9..fa9a150 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -3086,6 +3086,10 @@ void libxl__numa_candidate_put_nodemap(libxl__gc *gc,
libxl_bitmap_copy(CTX, &cndt->nodemap, nodemap);
}
+_hidden int libxl__ms_vm_genid_set(libxl__gc *gc, uint32_t domid,
+ const libxl_uuid *uuid);
+
+
/* Som handy macros for defbool type. */
#define LIBXL__DEFBOOL_DEFAULT (0)
#define LIBXL__DEFBOOL_FALSE (-1)
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index f0f6e34..1c5e687 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -371,6 +371,8 @@ libxl_domain_build_info = Struct("domain_build_info",[
("xen_platform_pci", libxl_defbool),
("usbdevice_list", libxl_string_list),
("vendor_device",
libxl_vendor_device),
+ # See libxl_ms_vm_genid_generate()
+ ("ms_vm_genid", libxl_uuid),
])),
("pv", Struct(None, [("kernel", string),
("slack_memkb", MemKB),
--
1.7.10.4
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