On Wed, 15 Feb 2017 22:18:14 -0800
b...@skyportsystems.com wrote:
> From: Ben Warren <b...@skyportsystems.com>
>
> This implements the VM Generation ID feature by passing a 128-bit
> GUID to the guest via a fw_cfg blob.
> Any time the GUID changes, an ACPI notify event is sent to the guest
>
> The user interface is a simple device with one parameter:
> - guid (string, must be "auto" or in UUID format
> xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)
>
> Signed-off-by: Ben Warren <b...@skyportsystems.com>
Reviewed-by: Igor Mammedov <imamm...@redhat.com>
Thing to get fixed on top is to check
that there isn't vmgenid device present already
into realizefn() and fail gracefully is there is.
> ---
> default-configs/i386-softmmu.mak | 1 +
> default-configs/x86_64-softmmu.mak | 1 +
> hw/acpi/Makefile.objs | 1 +
> hw/acpi/vmgenid.c | 239
> +++++++++++++++++++++++++++++++++++
> hw/i386/acpi-build.c | 16 +++
> include/hw/acpi/acpi_dev_interface.h | 1 +
> include/hw/acpi/vmgenid.h | 35 +++++
> 7 files changed, 294 insertions(+)
> create mode 100644 hw/acpi/vmgenid.c
> create mode 100644 include/hw/acpi/vmgenid.h
>
> diff --git a/default-configs/i386-softmmu.mak
> b/default-configs/i386-softmmu.mak
> index 48b07a4..029e952 100644
> --- a/default-configs/i386-softmmu.mak
> +++ b/default-configs/i386-softmmu.mak
> @@ -59,3 +59,4 @@ CONFIG_I82801B11=y
> CONFIG_SMBIOS=y
> CONFIG_HYPERV_TESTDEV=$(CONFIG_KVM)
> CONFIG_PXB=y
> +CONFIG_ACPI_VMGENID=y
> diff --git a/default-configs/x86_64-softmmu.mak
> b/default-configs/x86_64-softmmu.mak
> index fd96345..d1d7432 100644
> --- a/default-configs/x86_64-softmmu.mak
> +++ b/default-configs/x86_64-softmmu.mak
> @@ -59,3 +59,4 @@ CONFIG_I82801B11=y
> CONFIG_SMBIOS=y
> CONFIG_HYPERV_TESTDEV=$(CONFIG_KVM)
> CONFIG_PXB=y
> +CONFIG_ACPI_VMGENID=y
> diff --git a/hw/acpi/Makefile.objs b/hw/acpi/Makefile.objs
> index 6acf798..11c35bc 100644
> --- a/hw/acpi/Makefile.objs
> +++ b/hw/acpi/Makefile.objs
> @@ -5,6 +5,7 @@ common-obj-$(CONFIG_ACPI_CPU_HOTPLUG) += cpu_hotplug.o
> common-obj-$(CONFIG_ACPI_MEMORY_HOTPLUG) += memory_hotplug.o
> common-obj-$(CONFIG_ACPI_CPU_HOTPLUG) += cpu.o
> common-obj-$(CONFIG_ACPI_NVDIMM) += nvdimm.o
> +common-obj-$(CONFIG_ACPI_VMGENID) += vmgenid.o
> common-obj-$(call lnot,$(CONFIG_ACPI_X86)) += acpi-stub.o
>
> common-obj-y += acpi_interface.o
> diff --git a/hw/acpi/vmgenid.c b/hw/acpi/vmgenid.c
> new file mode 100644
> index 0000000..8fba7e0
> --- /dev/null
> +++ b/hw/acpi/vmgenid.c
> @@ -0,0 +1,239 @@
> +/*
> + * Virtual Machine Generation ID Device
> + *
> + * Copyright (C) 2017 Skyport Systems.
> + *
> + * Author: Ben Warren <b...@skyportsystems.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + *
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qmp-commands.h"
> +#include "hw/acpi/acpi.h"
> +#include "hw/acpi/aml-build.h"
> +#include "hw/acpi/vmgenid.h"
> +#include "hw/nvram/fw_cfg.h"
> +#include "sysemu/sysemu.h"
> +
> +void vmgenid_build_acpi(VmGenIdState *vms, GArray *table_data, GArray *guid,
> + BIOSLinker *linker)
> +{
> + Aml *ssdt, *dev, *scope, *method, *addr, *if_ctx;
> + uint32_t vgia_offset;
> + QemuUUID guid_le;
> +
> + /* Fill in the GUID values. These need to be converted to little-endian
> + * first, since that's what the guest expects
> + */
> + g_array_set_size(guid, VMGENID_FW_CFG_SIZE - ARRAY_SIZE(guid_le.data));
> + guid_le = vms->guid;
> + qemu_uuid_bswap(&guid_le);
> + /* The GUID is written at a fixed offset into the fw_cfg file
> + * in order to implement the "OVMF SDT Header probe suppressor"
> + * see docs/specs/vmgenid.txt for more details
> + */
> + g_array_insert_vals(guid, VMGENID_GUID_OFFSET, guid_le.data,
> + ARRAY_SIZE(guid_le.data));
> +
> + /* Put this in a separate SSDT table */
> + ssdt = init_aml_allocator();
> +
> + /* Reserve space for header */
> + acpi_data_push(ssdt->buf, sizeof(AcpiTableHeader));
> +
> + /* Storage for the GUID address */
> + vgia_offset = table_data->len +
> + build_append_named_dword(ssdt->buf, "VGIA");
> + scope = aml_scope("\\_SB");
> + dev = aml_device("VGEN");
> + aml_append(dev, aml_name_decl("_HID", aml_string("QEMUVGID")));
> + aml_append(dev, aml_name_decl("_CID", aml_string("VM_Gen_Counter")));
> + aml_append(dev, aml_name_decl("_DDN", aml_string("VM_Gen_Counter")));
> +
> + /* Simple status method to check that address is linked and non-zero */
> + method = aml_method("_STA", 0, AML_NOTSERIALIZED);
> + addr = aml_local(0);
> + aml_append(method, aml_store(aml_int(0xf), addr));
> + if_ctx = aml_if(aml_equal(aml_name("VGIA"), aml_int(0)));
> + aml_append(if_ctx, aml_store(aml_int(0), addr));
> + aml_append(method, if_ctx);
> + aml_append(method, aml_return(addr));
> + aml_append(dev, method);
> +
> + /* the ADDR method returns two 32-bit words representing the lower and
> + * upper halves * of the physical address of the fw_cfg blob
> + * (holding the GUID)
> + */
> + method = aml_method("ADDR", 0, AML_NOTSERIALIZED);
> +
> + addr = aml_local(0);
> + aml_append(method, aml_store(aml_package(2), addr));
> +
> + aml_append(method, aml_store(aml_add(aml_name("VGIA"),
> + aml_int(VMGENID_GUID_OFFSET), NULL),
> + aml_index(addr, aml_int(0))));
> + aml_append(method, aml_store(aml_int(0), aml_index(addr, aml_int(1))));
> + aml_append(method, aml_return(addr));
> +
> + aml_append(dev, method);
> + aml_append(scope, dev);
> + aml_append(ssdt, scope);
> +
> + /* attach an ACPI notify */
> + method = aml_method("\\_GPE._E05", 0, AML_NOTSERIALIZED);
> + aml_append(method, aml_notify(aml_name("\\_SB.VGEN"), aml_int(0x80)));
> + aml_append(ssdt, method);
> +
> + g_array_append_vals(table_data, ssdt->buf->data, ssdt->buf->len);
> +
> + /* Allocate guest memory for the Data fw_cfg blob */
> + bios_linker_loader_alloc(linker, VMGENID_GUID_FW_CFG_FILE, guid, 4096,
> + false /* page boundary, high memory */);
> +
> + /* Patch address of GUID fw_cfg blob into the ADDR fw_cfg blob
> + * so QEMU can write the GUID there. The address is expected to be
> + * < 4GB, but write 64 bits anyway.
> + */
> + bios_linker_loader_write_pointer(linker,
> + VMGENID_ADDR_FW_CFG_FILE, 0, sizeof(uint64_t),
> + VMGENID_GUID_FW_CFG_FILE, VMGENID_GUID_OFFSET);
> +
> + /* Patch address of GUID fw_cfg blob into the AML so OSPM can retrieve
> + * and read it. Note that while we provide storage for 64 bits, only
> + * the least-signficant 32 get patched into AML.
> + */
> + bios_linker_loader_add_pointer(linker,
> + ACPI_BUILD_TABLE_FILE, vgia_offset, sizeof(uint32_t),
> + VMGENID_GUID_FW_CFG_FILE, 0);
> +
> + build_header(linker, table_data,
> + (void *)(table_data->data + table_data->len - ssdt->buf->len),
> + "SSDT", ssdt->buf->len, 1, NULL, "VMGENID");
> + free_aml_allocator();
> +}
> +
> +void vmgenid_add_fw_cfg(VmGenIdState *vms, FWCfgState *s, GArray *guid)
> +{
> + /* Create a read-only fw_cfg file for GUID */
> + fw_cfg_add_file(s, VMGENID_GUID_FW_CFG_FILE, guid->data,
> + VMGENID_FW_CFG_SIZE);
> + /* Create a read-write fw_cfg file for Address */
> + fw_cfg_add_file_callback(s, VMGENID_ADDR_FW_CFG_FILE, NULL, NULL,
> + vms->vmgenid_addr_le,
> + ARRAY_SIZE(vms->vmgenid_addr_le), false);
> +}
> +
> +static void vmgenid_update_guest(VmGenIdState *vms)
> +{
> + Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, NULL);
> + uint32_t vmgenid_addr;
> + QemuUUID guid_le;
> +
> + if (obj) {
> + /* Write the GUID to guest memory */
> + memcpy(&vmgenid_addr, vms->vmgenid_addr_le, sizeof(vmgenid_addr));
> + vmgenid_addr = le32_to_cpu(vmgenid_addr);
> + /* A zero value in vmgenid_addr means that BIOS has not yet written
> + * the address
> + */
> + if (vmgenid_addr) {
> + /* QemuUUID has the first three words as big-endian, and expect
> + * that any GUIDs passed in will always be BE. The guest,
> + * however, will expect the fields to be little-endian.
> + * Perform a byte swap immediately before writing.
> + */
> + guid_le = vms->guid;
> + qemu_uuid_bswap(&guid_le);
> + /* The GUID is written at a fixed offset into the fw_cfg file
> + * in order to implement the "OVMF SDT Header probe suppressor"
> + * see docs/specs/vmgenid.txt for more details
> + */
> + cpu_physical_memory_write(vmgenid_addr, guid_le.data,
> + sizeof(guid_le.data));
> + /* Send _GPE.E05 event */
> + acpi_send_event(DEVICE(obj), ACPI_VMGENID_CHANGE_STATUS);
> + }
> + }
> +}
> +
> +static void vmgenid_set_guid(Object *obj, const char *value, Error **errp)
> +{
> + VmGenIdState *vms = VMGENID(obj);
> +
> + if (!strcmp(value, "auto")) {
> + qemu_uuid_generate(&vms->guid);
> + } else if (qemu_uuid_parse(value, &vms->guid) < 0) {
> + error_setg(errp, "'%s. %s': Failed to parse GUID string: %s",
> + object_get_typename(OBJECT(vms)), VMGENID_GUID, value);
> + return;
> + }
> +
> + vmgenid_update_guest(vms);
> +}
> +
> +/* After restoring an image, we need to update the guest memory and notify
> + * it of a potential change to VM Generation ID
> + */
> +static int vmgenid_post_load(void *opaque, int version_id)
> +{
> + VmGenIdState *vms = opaque;
> + vmgenid_update_guest(vms);
> + return 0;
> +}
> +
> +static const VMStateDescription vmstate_vmgenid = {
> + .name = "vmgenid",
> + .version_id = 1,
> + .minimum_version_id = 1,
> + .post_load = vmgenid_post_load,
> + .fields = (VMStateField[]) {
> + VMSTATE_UINT8_ARRAY(vmgenid_addr_le, VmGenIdState, sizeof(uint64_t)),
> + VMSTATE_END_OF_LIST()
> + },
> +};
> +
> +static void vmgenid_handle_reset(void *opaque)
> +{
> + VmGenIdState *vms = VMGENID(opaque);
> + /* Clear the guest-allocated GUID address when the VM resets */
> + memset(vms->vmgenid_addr_le, 0, ARRAY_SIZE(vms->vmgenid_addr_le));
> +}
> +
> +static void vmgenid_realize(DeviceState *dev, Error **errp)
> +{
> + VmGenIdState *vms = VMGENID(dev);
> + qemu_register_reset(vmgenid_handle_reset, vms);
> +}
> +
> +static void vmgenid_device_class_init(ObjectClass *klass, void *data)
> +{
> + DeviceClass *dc = DEVICE_CLASS(klass);
> +
> + dc->vmsd = &vmstate_vmgenid;
> + dc->realize = vmgenid_realize;
> + dc->hotpluggable = false;
> +
> + object_class_property_add_str(klass, VMGENID_GUID, NULL,
> + vmgenid_set_guid, NULL);
> + object_class_property_set_description(klass, VMGENID_GUID,
> + "Set Global Unique Identifier "
> + "(big-endian) or auto for random value",
> + NULL);
> +}
> +
> +static const TypeInfo vmgenid_device_info = {
> + .name = VMGENID_DEVICE,
> + .parent = TYPE_DEVICE,
> + .instance_size = sizeof(VmGenIdState),
> + .class_init = vmgenid_device_class_init,
> +};
> +
> +static void vmgenid_register_types(void)
> +{
> + type_register_static(&vmgenid_device_info);
> +}
> +
> +type_init(vmgenid_register_types)
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 1c928ab..db04cf5 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -42,6 +42,7 @@
> #include "hw/acpi/memory_hotplug.h"
> #include "sysemu/tpm.h"
> #include "hw/acpi/tpm.h"
> +#include "hw/acpi/vmgenid.h"
> #include "sysemu/tpm_backend.h"
> #include "hw/timer/mc146818rtc_regs.h"
> #include "sysemu/numa.h"
> @@ -2610,6 +2611,7 @@ void acpi_build(AcpiBuildTables *tables, MachineState
> *machine)
> size_t aml_len = 0;
> GArray *tables_blob = tables->table_data;
> AcpiSlicOem slic_oem = { .id = NULL, .table_id = NULL };
> + Object *vmgenid_dev;
>
> acpi_get_pm_info(&pm);
> acpi_get_misc_info(&misc);
> @@ -2653,6 +2655,13 @@ void acpi_build(AcpiBuildTables *tables, MachineState
> *machine)
> acpi_add_table(table_offsets, tables_blob);
> build_madt(tables_blob, tables->linker, pcms);
>
> + vmgenid_dev = find_vmgenid_dev();
> + if (vmgenid_dev) {
> + acpi_add_table(table_offsets, tables_blob);
> + vmgenid_build_acpi(VMGENID(vmgenid_dev), tables_blob,
> + tables->vmgenid, tables->linker);
> + }
> +
> if (misc.has_hpet) {
> acpi_add_table(table_offsets, tables_blob);
> build_hpet(tables_blob, tables->linker);
> @@ -2823,6 +2832,7 @@ void acpi_setup(void)
> PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
> AcpiBuildTables tables;
> AcpiBuildState *build_state;
> + Object *vmgenid_dev;
>
> if (!pcms->fw_cfg) {
> ACPI_BUILD_DPRINTF("No fw cfg. Bailing out.\n");
> @@ -2859,6 +2869,12 @@ void acpi_setup(void)
> fw_cfg_add_file(pcms->fw_cfg, ACPI_BUILD_TPMLOG_FILE,
> tables.tcpalog->data, acpi_data_len(tables.tcpalog));
>
> + vmgenid_dev = find_vmgenid_dev();
> + if (vmgenid_dev) {
> + vmgenid_add_fw_cfg(VMGENID(vmgenid_dev), pcms->fw_cfg,
> + tables.vmgenid);
> + }
> +
> if (!pcmc->rsdp_in_ram) {
> /*
> * Keep for compatibility with old machine types.
> diff --git a/include/hw/acpi/acpi_dev_interface.h
> b/include/hw/acpi/acpi_dev_interface.h
> index 71d3c48..3c2e4e9 100644
> --- a/include/hw/acpi/acpi_dev_interface.h
> +++ b/include/hw/acpi/acpi_dev_interface.h
> @@ -11,6 +11,7 @@ typedef enum {
> ACPI_CPU_HOTPLUG_STATUS = 4,
> ACPI_MEMORY_HOTPLUG_STATUS = 8,
> ACPI_NVDIMM_HOTPLUG_STATUS = 16,
> + ACPI_VMGENID_CHANGE_STATUS = 32,
> } AcpiEventStatusBits;
>
> #define TYPE_ACPI_DEVICE_IF "acpi-device-interface"
> diff --git a/include/hw/acpi/vmgenid.h b/include/hw/acpi/vmgenid.h
> new file mode 100644
> index 0000000..db7fa0e
> --- /dev/null
> +++ b/include/hw/acpi/vmgenid.h
> @@ -0,0 +1,35 @@
> +#ifndef ACPI_VMGENID_H
> +#define ACPI_VMGENID_H
> +
> +#include "hw/acpi/bios-linker-loader.h"
> +#include "hw/qdev.h"
> +#include "qemu/uuid.h"
> +
> +#define VMGENID_DEVICE "vmgenid"
> +#define VMGENID_GUID "guid"
> +#define VMGENID_GUID_FW_CFG_FILE "etc/vmgenid_guid"
> +#define VMGENID_ADDR_FW_CFG_FILE "etc/vmgenid_addr"
> +
> +#define VMGENID_FW_CFG_SIZE 4096 /* Occupy a page of memory */
> +#define VMGENID_GUID_OFFSET 40 /* allow space for
> + * OVMF SDT Header Probe Supressor
> + */
> +
> +#define VMGENID(obj) OBJECT_CHECK(VmGenIdState, (obj), VMGENID_DEVICE)
> +
> +typedef struct VmGenIdState {
> + DeviceClass parent_obj;
> + QemuUUID guid; /* The 128-bit GUID seen by the guest */
> + uint8_t vmgenid_addr_le[8]; /* Address of the GUID (little-endian) */
> +} VmGenIdState;
> +
> +static inline Object *find_vmgenid_dev(void)
> +{
> + return object_resolve_path_type("", VMGENID_DEVICE, NULL);
> +}
> +
> +void vmgenid_build_acpi(VmGenIdState *vms, GArray *table_data, GArray *guid,
> + BIOSLinker *linker);
> +void vmgenid_add_fw_cfg(VmGenIdState *vms, FWCfgState *s, GArray *guid);
> +
> +#endif
