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[PATCH v2 04/10] backends/igvm: Implement parsing and processing of IGVM
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From: |
Roy Hopkins |
|
Subject: |
[PATCH v2 04/10] backends/igvm: Implement parsing and processing of IGVM files |
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Date: |
Wed, 3 Apr 2024 12:11:35 +0100 |
This commit adds an implementation of an IGVM loader which parses the
file specified as a pararameter to ConfidentialGuestSupport and provides
a function that uses the interface in the same object to configure and
populate guest memory based on the contents of the file.
The IGVM file is parsed when a filename is provided but the code to
process the IGVM file is not yet hooked into target systems. This will
follow in a later commit.
Signed-off-by: Roy Hopkins <roy.hopkins@suse.com>
---
backends/confidential-guest-support.c | 4 +
backends/igvm.c | 745 ++++++++++++++++++++++
backends/meson.build | 1 +
include/exec/confidential-guest-support.h | 5 +
include/exec/igvm.h | 36 ++
5 files changed, 791 insertions(+)
create mode 100644 backends/igvm.c
create mode 100644 include/exec/igvm.h
diff --git a/backends/confidential-guest-support.c
b/backends/confidential-guest-support.c
index cb0bc543c0..adfe447334 100644
--- a/backends/confidential-guest-support.c
+++ b/backends/confidential-guest-support.c
@@ -16,6 +16,7 @@
#include "exec/confidential-guest-support.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
+#include "exec/igvm.h"
OBJECT_DEFINE_ABSTRACT_TYPE(ConfidentialGuestSupport,
confidential_guest_support,
@@ -34,6 +35,9 @@ static void set_igvm(Object *obj, const char *value, Error
**errp)
ConfidentialGuestSupport *cgs = CONFIDENTIAL_GUEST_SUPPORT(obj);
g_free(cgs->igvm_filename);
cgs->igvm_filename = g_strdup(value);
+#if defined(CONFIG_IGVM)
+ igvm_file_init(cgs, errp);
+#endif
}
#endif
diff --git a/backends/igvm.c b/backends/igvm.c
new file mode 100644
index 0000000000..87e6032a2e
--- /dev/null
+++ b/backends/igvm.c
@@ -0,0 +1,745 @@
+/*
+ * QEMU IGVM configuration backend for Confidential Guests
+ *
+ * Copyright (C) 2023-2024 SUSE
+ *
+ * Authors:
+ * Roy Hopkins <roy.hopkins@suse.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"
+
+#if defined(CONFIG_IGVM)
+
+#include "exec/confidential-guest-support.h"
+#include "qemu/queue.h"
+#include "qemu/typedefs.h"
+
+#include "exec/igvm.h"
+#include "qemu/error-report.h"
+#include "hw/boards.h"
+#include "qapi/error.h"
+#include "exec/address-spaces.h"
+
+#include <igvm/igvm.h>
+#include <igvm/igvm_defs.h>
+#include <linux/kvm.h>
+
+typedef struct IgvmParameterData {
+ QTAILQ_ENTRY(IgvmParameterData) next;
+ uint8_t *data;
+ uint32_t size;
+ uint32_t index;
+} IgvmParameterData;
+
+static QTAILQ_HEAD(, IgvmParameterData) parameter_data;
+
+static int directive_page_data(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp);
+static int directive_vp_context(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp);
+static int directive_parameter_area(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp);
+static int directive_parameter_insert(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error
**errp);
+static int directive_memory_map(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp);
+static int directive_vp_count(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp);
+static int directive_environment_info(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error
**errp);
+static int directive_required_memory(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp);
+
+struct IGVMDirectiveHandler {
+ uint32_t type;
+ int (*handler)(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask, const uint8_t *header_data,
+ Error **errp);
+};
+
+static struct IGVMDirectiveHandler directive_handlers[] = {
+ { IGVM_VHT_PAGE_DATA, directive_page_data },
+ { IGVM_VHT_VP_CONTEXT, directive_vp_context },
+ { IGVM_VHT_PARAMETER_AREA, directive_parameter_area },
+ { IGVM_VHT_PARAMETER_INSERT, directive_parameter_insert },
+ { IGVM_VHT_MEMORY_MAP, directive_memory_map },
+ { IGVM_VHT_VP_COUNT_PARAMETER, directive_vp_count },
+ { IGVM_VHT_ENVIRONMENT_INFO_PARAMETER, directive_environment_info },
+ { IGVM_VHT_REQUIRED_MEMORY, directive_required_memory },
+};
+
+static int directive(uint32_t type, ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask, Error **errp)
+{
+ size_t handler;
+ IgvmHandle header_handle;
+ const uint8_t *header_data;
+ int result;
+
+ for (handler = 0; handler < (sizeof(directive_handlers) /
+ sizeof(struct IGVMDirectiveHandler));
+ ++handler) {
+ if (directive_handlers[handler].type == type) {
+ header_handle =
+ igvm_get_header(cgs->igvm, HEADER_SECTION_DIRECTIVE, i);
+ if (header_handle < 0) {
+ error_setg(
+ errp,
+ "IGVM file is invalid: Failed to read directive header
(code: %d)",
+ (int)header_handle);
+ return -1;
+ }
+ header_data = igvm_get_buffer(cgs->igvm, header_handle) +
+ sizeof(IGVM_VHS_VARIABLE_HEADER);
+ result = directive_handlers[handler].handler(
+ cgs, i, compatibility_mask, header_data, errp);
+ igvm_free_buffer(cgs->igvm, header_handle);
+ return result;
+ }
+ }
+ error_setg(errp,
+ "IGVM: Unknown directive type encountered when processing file:
"
+ "(type 0x%X)",
+ type);
+ return -1;
+}
+
+static void *igvm_prepare_memory(uint64_t addr, uint64_t size,
+ int region_identifier, Error **errp)
+{
+ MemoryRegion *igvm_pages = NULL;
+ Int128 gpa_region_size;
+ MemoryRegionSection mrs =
+ memory_region_find(get_system_memory(), addr, size);
+ if (mrs.mr) {
+ if (!memory_region_is_ram(mrs.mr)) {
+ memory_region_unref(mrs.mr);
+ error_setg(
+ errp,
+ "Processing of IGVM file failed: Could not prepare memory "
+ "at address 0x%lX due to existing non-RAM region",
+ addr);
+ return NULL;
+ }
+
+ gpa_region_size = int128_make64(size);
+ if (int128_lt(mrs.size, gpa_region_size)) {
+ memory_region_unref(mrs.mr);
+ error_setg(
+ errp,
+ "Processing of IGVM file failed: Could not prepare memory "
+ "at address 0x%lX: region size exceeded",
+ addr);
+ return NULL;
+ }
+ return qemu_map_ram_ptr(mrs.mr->ram_block, mrs.offset_within_region);
+ } else {
+ /*
+ * The region_identifier is the is the index of the IGVM directive that
+ * contains the page with the lowest GPA in the region. This will
+ * generate a unique region name.
+ */
+ g_autofree char *region_name =
+ g_strdup_printf("igvm.%X", region_identifier);
+ igvm_pages = g_malloc(sizeof(*igvm_pages));
+ if (!memory_region_init_ram(igvm_pages, NULL, region_name, size,
+ errp)) {
+ return NULL;
+ }
+ memory_region_add_subregion(get_system_memory(), addr, igvm_pages);
+ return memory_region_get_ram_ptr(igvm_pages);
+ }
+}
+
+static int igvm_type_to_cgs_type(IgvmPageDataType memory_type, bool unmeasured,
+ bool zero)
+{
+ switch (memory_type) {
+ case NORMAL: {
+ if (unmeasured) {
+ return CGS_PAGE_TYPE_UNMEASURED;
+ } else {
+ return zero ? CGS_PAGE_TYPE_ZERO : CGS_PAGE_TYPE_NORMAL;
+ }
+ }
+ case SECRETS:
+ return CGS_PAGE_TYPE_SECRETS;
+ case CPUID_DATA:
+ return CGS_PAGE_TYPE_CPUID;
+ case CPUID_XF:
+ return CGS_PAGE_TYPE_CPUID;
+ default:
+ return -1;
+ }
+}
+
+static bool page_attrs_equal(IgvmHandle igvm, int i,
+ const IGVM_VHS_PAGE_DATA *page_1,
+ const IGVM_VHS_PAGE_DATA *page_2)
+{
+ IgvmHandle data_handle1, data_handle2;
+
+ /*
+ * If one page has data and the other doesn't then this results in
different
+ * page types: NORMAL vs ZERO.
+ */
+ data_handle1 = igvm_get_header_data(igvm, HEADER_SECTION_DIRECTIVE, i - 1);
+ data_handle2 = igvm_get_header_data(igvm, HEADER_SECTION_DIRECTIVE, i);
+ if ((data_handle1 == IGVMAPI_NO_DATA) &&
+ (data_handle2 != IGVMAPI_NO_DATA)) {
+ return false;
+ } else if ((data_handle1 != IGVMAPI_NO_DATA) &&
+ (data_handle2 == IGVMAPI_NO_DATA)) {
+ return false;
+ }
+ return ((*(const uint32_t *)&page_1->flags ==
+ *(const uint32_t *)&page_2->flags) &&
+ (page_1->data_type == page_2->data_type) &&
+ (page_1->compatibility_mask == page_2->compatibility_mask));
+}
+
+static int igvm_process_mem_region(ConfidentialGuestSupport *cgs,
+ IgvmHandle igvm, int start_index,
+ uint64_t gpa_start, int page_count,
+ const IgvmPageDataFlags *flags,
+ const IgvmPageDataType page_type,
+ Error **errp)
+{
+ ERRP_GUARD();
+ uint8_t *region;
+ IgvmHandle data_handle;
+ const void *data;
+ uint32_t data_size;
+ int i;
+ bool zero = true;
+ const uint64_t page_size = flags->is_2mb_page ? 0x200000 : 0x1000;
+ int result;
+ int cgs_page_type;
+
+ region = igvm_prepare_memory(gpa_start, page_count * page_size,
start_index,
+ errp);
+ if (!region) {
+ return -1;
+ }
+
+ for (i = 0; i < page_count; ++i) {
+ data_handle = igvm_get_header_data(igvm, HEADER_SECTION_DIRECTIVE,
+ i + start_index);
+ if (data_handle == IGVMAPI_NO_DATA) {
+ /* No data indicates a zero page */
+ memset(®ion[i * page_size], 0, page_size);
+ } else if (data_handle < 0) {
+ error_setg(
+ errp,
+ "IGVM file contains invalid page data for directive with "
+ "index %d",
+ i + start_index);
+ return -1;
+ } else {
+ zero = false;
+ data_size = igvm_get_buffer_size(igvm, data_handle);
+ if (data_size < page_size) {
+ memset(®ion[i * page_size], 0, page_size);
+ } else if (data_size > page_size) {
+ error_setg(errp,
+ "IGVM file contains page data with invalid size for
"
+ "directive with index %d",
+ i + start_index);
+ return -1;
+ }
+ data = igvm_get_buffer(igvm, data_handle);
+ memcpy(®ion[i * page_size], data, data_size);
+ igvm_free_buffer(igvm, data_handle);
+ }
+ }
+
+ cgs_page_type = igvm_type_to_cgs_type(page_type, flags->unmeasured, zero);
+ if (cgs_page_type < 0) {
+ error_setg(
+ errp,
+ "Invalid page type in IGVM file. Directives: %d to %d, "
+ "page type: %d",
+ start_index, start_index + page_count, page_type);
+ return -1;
+ }
+
+ result = cgs->set_guest_state(gpa_start, region, page_size * page_count,
+ cgs_page_type, 0, errp);
+ if ((result < 0) && !*errp) {
+ error_setg(errp, "IGVM set guest state failed with code %d", result);
+ return -1;
+ }
+ return 0;
+}
+
+static int process_mem_page(ConfidentialGuestSupport *cgs, int i,
+ const IGVM_VHS_PAGE_DATA *page_data, Error **errp)
+{
+ ERRP_GUARD();
+ static IGVM_VHS_PAGE_DATA prev_page_data;
+ static uint64_t region_start;
+ static int region_start_i;
+ static int last_i;
+ static int page_count;
+
+ if (page_data) {
+ if (page_count == 0) {
+ region_start = page_data->gpa;
+ region_start_i = i;
+ } else {
+ if (!page_attrs_equal(cgs->igvm, i, page_data, &prev_page_data) ||
+ ((prev_page_data.gpa +
+ (prev_page_data.flags.is_2mb_page ? 0x200000 : 0x1000)) !=
+ page_data->gpa) ||
+ (last_i != (i - 1))) {
+ /* End of current region */
+ if (igvm_process_mem_region(cgs, cgs->igvm, region_start_i,
+ region_start, page_count,
+ &prev_page_data.flags,
+ prev_page_data.data_type, errp) < 0) {
+ return -1;
+ }
+ page_count = 0;
+ region_start = page_data->gpa;
+ region_start_i = i;
+ }
+ }
+ memcpy(&prev_page_data, page_data, sizeof(prev_page_data));
+ last_i = i;
+ ++page_count;
+ } else {
+ if (page_count > 0) {
+ if (igvm_process_mem_region(cgs, cgs->igvm, region_start_i,
+ region_start, page_count,
+ &prev_page_data.flags,
+ prev_page_data.data_type, errp) < 0) {
+ return -1;
+ }
+ page_count = 0;
+ }
+ }
+ return 0;
+}
+
+static int directive_page_data(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp)
+{
+ const IGVM_VHS_PAGE_DATA *page_data =
+ (const IGVM_VHS_PAGE_DATA *)header_data;
+ if (page_data->compatibility_mask & compatibility_mask) {
+ return process_mem_page(cgs, i, page_data, errp);
+ }
+ return 0;
+}
+
+static int directive_vp_context(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp)
+{
+ ERRP_GUARD();
+ const IGVM_VHS_VP_CONTEXT *vp_context =
+ (const IGVM_VHS_VP_CONTEXT *)header_data;
+ IgvmHandle data_handle;
+ uint8_t *data;
+ int result;
+
+ if (vp_context->compatibility_mask & compatibility_mask) {
+ data_handle =
+ igvm_get_header_data(cgs->igvm, HEADER_SECTION_DIRECTIVE, i);
+ if (data_handle < 0) {
+ error_setg(errp, "Invalid VP context in IGVM file. Error code: %X",
+ data_handle);
+ return -1;
+ }
+
+ data = (uint8_t *)igvm_get_buffer(cgs->igvm, data_handle);
+ result = cgs->set_guest_state(
+ vp_context->gpa, data, igvm_get_buffer_size(cgs->igvm,
data_handle),
+ CGS_PAGE_TYPE_VMSA, vp_context->vp_index, errp);
+ igvm_free_buffer(cgs->igvm, data_handle);
+ if (result != 0) {
+ if (!*errp) {
+ error_setg(errp,
+ "IGVM: Failed to set CPU context: error_code=%d",
+ result);
+ }
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static int directive_parameter_area(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp)
+{
+ const IGVM_VHS_PARAMETER_AREA *param_area =
+ (const IGVM_VHS_PARAMETER_AREA *)header_data;
+ IgvmParameterData *param_entry;
+
+ param_entry = g_new0(IgvmParameterData, 1);
+ param_entry->size = param_area->number_of_bytes;
+ param_entry->index = param_area->parameter_area_index;
+ param_entry->data = g_malloc0(param_entry->size);
+
+ QTAILQ_INSERT_TAIL(¶meter_data, param_entry, next);
+ return 0;
+}
+
+static int directive_parameter_insert(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp)
+{
+ ERRP_GUARD();
+ const IGVM_VHS_PARAMETER_INSERT *param =
+ (const IGVM_VHS_PARAMETER_INSERT *)header_data;
+ IgvmParameterData *param_entry;
+ int result;
+ void *region;
+
+ QTAILQ_FOREACH(param_entry, ¶meter_data, next)
+ {
+ if (param_entry->index == param->parameter_area_index) {
+ region =
+ igvm_prepare_memory(param->gpa, param_entry->size, i, errp);
+ if (!region) {
+ return -1;
+ }
+ memcpy(region, param_entry->data, param_entry->size);
+ g_free(param_entry->data);
+ param_entry->data = NULL;
+
+ result = cgs->set_guest_state(param->gpa, region,
param_entry->size,
+ CGS_PAGE_TYPE_UNMEASURED, 0, errp);
+ if (result != 0) {
+ if (!*errp) {
+ error_setg(errp,
+ "IGVM: Failed to set guest state:
error_code=%d",
+ result);
+ }
+ return -1;
+ }
+ }
+ }
+ return 0;
+}
+
+static int cmp_mm_entry(const void *a, const void *b)
+{
+ const IGVM_VHS_MEMORY_MAP_ENTRY *entry_a =
+ (const IGVM_VHS_MEMORY_MAP_ENTRY *)a;
+ const IGVM_VHS_MEMORY_MAP_ENTRY *entry_b =
+ (const IGVM_VHS_MEMORY_MAP_ENTRY *)b;
+ if (entry_a->starting_gpa_page_number < entry_b->starting_gpa_page_number)
{
+ return -1;
+ } else if (entry_a->starting_gpa_page_number >
+ entry_b->starting_gpa_page_number) {
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+static int directive_memory_map(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp)
+{
+ const IGVM_VHS_PARAMETER *param = (const IGVM_VHS_PARAMETER *)header_data;
+ IgvmParameterData *param_entry;
+ int max_entry_count;
+ int entry = 0;
+ IGVM_VHS_MEMORY_MAP_ENTRY *mm_entry;
+ ConfidentialGuestMemoryMapEntry cgmm_entry;
+ int retval = 0;
+
+ /* Find the parameter area that should hold the memory map */
+ QTAILQ_FOREACH(param_entry, ¶meter_data, next)
+ {
+ if (param_entry->index == param->parameter_area_index) {
+ max_entry_count =
+ param_entry->size / sizeof(IGVM_VHS_MEMORY_MAP_ENTRY);
+ mm_entry = (IGVM_VHS_MEMORY_MAP_ENTRY *)param_entry->data;
+
+ retval = cgs->get_mem_map_entry(entry, &cgmm_entry, errp);
+ while (retval == 0) {
+ if (entry > max_entry_count) {
+ error_setg(
+ errp,
+ "IGVM: guest memory map size exceeds parameter area
defined in IGVM file");
+ return -1;
+ }
+ mm_entry[entry].starting_gpa_page_number = cgmm_entry.gpa >>
12;
+ mm_entry[entry].number_of_pages = cgmm_entry.size >> 12;
+
+ switch (cgmm_entry.type) {
+ case CGS_MEM_RAM:
+ mm_entry[entry].entry_type = MEMORY;
+ break;
+ case CGS_MEM_RESERVED:
+ mm_entry[entry].entry_type = PLATFORM_RESERVED;
+ break;
+ case CGS_MEM_ACPI:
+ mm_entry[entry].entry_type = PLATFORM_RESERVED;
+ break;
+ case CGS_MEM_NVS:
+ mm_entry[entry].entry_type = PERSISTENT;
+ break;
+ case CGS_MEM_UNUSABLE:
+ mm_entry[entry].entry_type = PLATFORM_RESERVED;
+ break;
+ }
+ retval = cgs->get_mem_map_entry(++entry, &cgmm_entry, errp);
+ }
+ if (retval < 0) {
+ return retval;
+ }
+ /* The entries need to be sorted */
+ qsort(mm_entry, entry, sizeof(IGVM_VHS_MEMORY_MAP_ENTRY),
+ cmp_mm_entry);
+
+ break;
+ }
+ }
+ return 0;
+}
+
+static int directive_vp_count(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp)
+{
+ const IGVM_VHS_PARAMETER *param = (const IGVM_VHS_PARAMETER *)header_data;
+ IgvmParameterData *param_entry;
+ uint32_t *vp_count;
+ CPUState *cpu;
+
+ QTAILQ_FOREACH(param_entry, ¶meter_data, next)
+ {
+ if (param_entry->index == param->parameter_area_index) {
+ vp_count = (uint32_t *)(param_entry->data + param->byte_offset);
+ *vp_count = 0;
+ CPU_FOREACH(cpu)
+ {
+ (*vp_count)++;
+ }
+ break;
+ }
+ }
+ return 0;
+}
+
+static int directive_environment_info(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp)
+{
+ const IGVM_VHS_PARAMETER *param = (const IGVM_VHS_PARAMETER *)header_data;
+ IgvmParameterData *param_entry;
+ IgvmEnvironmentInfo *environmental_state;
+
+ QTAILQ_FOREACH(param_entry, ¶meter_data, next)
+ {
+ if (param_entry->index == param->parameter_area_index) {
+ environmental_state =
+ (IgvmEnvironmentInfo *)(param_entry->data +
param->byte_offset);
+ environmental_state->memory_is_shared = 1;
+ break;
+ }
+ }
+ return 0;
+}
+
+static int directive_required_memory(ConfidentialGuestSupport *cgs, int i,
+ uint32_t compatibility_mask,
+ const uint8_t *header_data, Error **errp)
+{
+ ERRP_GUARD();
+ const IGVM_VHS_REQUIRED_MEMORY *mem =
+ (const IGVM_VHS_REQUIRED_MEMORY *)header_data;
+ uint8_t *region;
+ int result;
+
+ if (mem->compatibility_mask & compatibility_mask) {
+ region = igvm_prepare_memory(mem->gpa, mem->number_of_bytes, i, errp);
+ if (!region) {
+ return -1;
+ }
+ result = cgs->set_guest_state(mem->gpa, region, mem->number_of_bytes,
+ CGS_PAGE_TYPE_REQUIRED_MEMORY, 0, errp);
+ if (result < 0) {
+ if (!*errp) {
+ error_setg(errp,
+ "IGVM: Failed to set guest state: error_code=%d",
+ result);
+ }
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static uint32_t supported_platform_compat_mask(ConfidentialGuestSupport *cgs,
+ Error **errp)
+{
+ int32_t result;
+ int i;
+ IgvmHandle header_handle;
+ IGVM_VHS_SUPPORTED_PLATFORM *platform;
+ uint32_t compatibility_mask = 0;
+
+ result = igvm_header_count(cgs->igvm, HEADER_SECTION_PLATFORM);
+ if (result < 0) {
+ error_setg(errp,
+ "Invalid platform header count in IGVM file. Error code:
%X",
+ result);
+ return 0;
+ }
+
+ for (i = 0; i < (int)result; ++i) {
+ IgvmVariableHeaderType typ =
+ igvm_get_header_type(cgs->igvm, HEADER_SECTION_PLATFORM, i);
+ if (typ == IGVM_VHT_SUPPORTED_PLATFORM) {
+ header_handle =
+ igvm_get_header(cgs->igvm, HEADER_SECTION_PLATFORM, i);
+ if (header_handle < 0) {
+ error_setg(errp,
+ "Invalid platform header in IGVM file. "
+ "Index: %d, Error code: %X",
+ i, header_handle);
+ return 0;
+ }
+ platform =
+ (IGVM_VHS_SUPPORTED_PLATFORM *)(igvm_get_buffer(cgs->igvm,
+ header_handle)
+
+ sizeof(
+ IGVM_VHS_VARIABLE_HEADER));
+ /* Currently only support SEV-SNP. */
+ if (platform->platform_type == SEV_SNP) {
+ /*
+ * IGVM does not define a platform types of SEV or SEV_ES.
+ * Translate SEV_SNP into CGS_PLATFORM_SEV_ES and
+ * CGS_PLATFORM_SEV and let the cgs function implementations
+ * check whether each IGVM directive results in an operation
+ * that is supported by the particular derivative of SEV.
+ */
+ if (cgs->check_support(
+ CGS_PLATFORM_SEV_ES, platform->platform_version,
+ platform->highest_vtl, platform->shared_gpa_boundary)
||
+ cgs->check_support(
+ CGS_PLATFORM_SEV, platform->platform_version,
+ platform->highest_vtl, platform->shared_gpa_boundary))
{
+ compatibility_mask = platform->compatibility_mask;
+ break;
+ }
+ }
+ igvm_free_buffer(cgs->igvm, header_handle);
+ }
+ }
+ if (compatibility_mask == 0) {
+ error_setg(
+ errp,
+ "IGVM file does not describe a compatible supported platform");
+ }
+ return compatibility_mask;
+}
+
+int igvm_file_init(ConfidentialGuestSupport *cgs, Error **errp)
+{
+ g_autofree uint8_t *buf = NULL;
+ unsigned long len;
+ g_autoptr(GError) gerr = NULL;
+
+ if (!cgs->igvm_filename) {
+ return 0;
+ }
+
+ if (!g_file_get_contents(cgs->igvm_filename, (gchar **)&buf, &len, &gerr))
{
+ error_setg(errp, "Unable to load %s: %s", cgs->igvm_filename,
+ gerr->message);
+ return -1;
+ }
+
+ cgs->igvm = igvm_new_from_binary(buf, len);
+ if (cgs->igvm < 0) {
+ error_setg(errp, "Unable to parse IGVM file %s: %d",
cgs->igvm_filename,
+ cgs->igvm);
+ return -1;
+ }
+
+ return 0;
+}
+
+int igvm_process(ConfidentialGuestSupport *cgs, Error **errp)
+{
+ int32_t result;
+ int i;
+ uint32_t compatibility_mask;
+ IgvmParameterData *parameter;
+ int retval = 0;
+
+ /*
+ * If this is not a Confidential guest or no IGVM has been provided then
+ * this is a no-op.
+ */
+ if (!cgs->igvm) {
+ return 0;
+ }
+
+ /*
+ * Check that the IGVM file provides configuration for the current
+ * platform
+ */
+ compatibility_mask = supported_platform_compat_mask(cgs, errp);
+ if (compatibility_mask == 0) {
+ return -1;
+ }
+
+ result = igvm_header_count(cgs->igvm, HEADER_SECTION_DIRECTIVE);
+ if (result < 0) {
+ error_setg(
+ errp, "Invalid directive header count in IGVM file. Error code:
%X",
+ result);
+ return -1;
+ }
+
+ QTAILQ_INIT(¶meter_data);
+
+ for (i = 0; i < (int)result; ++i) {
+ IgvmVariableHeaderType type =
+ igvm_get_header_type(cgs->igvm, HEADER_SECTION_DIRECTIVE, i);
+ if (directive(type, cgs, i, compatibility_mask, errp) < 0) {
+ retval = -1;
+ break;
+ }
+ }
+
+ /*
+ * Contiguous pages of data with compatible flags are grouped together in
+ * order to reduce the number of memory regions we create. Make sure the
+ * last group is processed with this call.
+ */
+ if (retval == 0) {
+ retval = process_mem_page(cgs, i, NULL, errp);
+ }
+
+ QTAILQ_FOREACH(parameter, ¶meter_data, next)
+ {
+ g_free(parameter->data);
+ parameter->data = NULL;
+ }
+
+ return retval;
+}
+
+#endif
diff --git a/backends/meson.build b/backends/meson.build
index d550ac19f7..d092850a07 100644
--- a/backends/meson.build
+++ b/backends/meson.build
@@ -32,6 +32,7 @@ system_ss.add(when: gio, if_true: files('dbus-vmstate.c'))
system_ss.add(when: 'CONFIG_SGX', if_true: files('hostmem-epc.c'))
if igvm.found()
system_ss.add(igvm)
+ system_ss.add(files('igvm.c'))
endif
subdir('tpm')
diff --git a/include/exec/confidential-guest-support.h
b/include/exec/confidential-guest-support.h
index a8ad84fa07..9419e91249 100644
--- a/include/exec/confidential-guest-support.h
+++ b/include/exec/confidential-guest-support.h
@@ -27,6 +27,10 @@
#include "igvm/igvm.h"
#endif
+#if defined(CONFIG_IGVM)
+#include "igvm/igvm.h"
+#endif
+
#define TYPE_CONFIDENTIAL_GUEST_SUPPORT "confidential-guest-support"
OBJECT_DECLARE_SIMPLE_TYPE(ConfidentialGuestSupport,
CONFIDENTIAL_GUEST_SUPPORT)
@@ -93,6 +97,7 @@ struct ConfidentialGuestSupport {
* Virtual Machine (IGVM) format.
*/
char *igvm_filename;
+ IgvmHandle igvm;
#endif
/*
diff --git a/include/exec/igvm.h b/include/exec/igvm.h
new file mode 100644
index 0000000000..59594f047e
--- /dev/null
+++ b/include/exec/igvm.h
@@ -0,0 +1,36 @@
+/*
+ * QEMU IGVM configuration backend for Confidential Guests
+ *
+ * Copyright (C) 2023-2024 SUSE
+ *
+ * Authors:
+ * Roy Hopkins <roy.hopkins@suse.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.
+ */
+
+#ifndef EXEC_IGVM_H
+#define EXEC_IGVM_H
+
+#include "exec/confidential-guest-support.h"
+
+#if defined(CONFIG_IGVM)
+
+int igvm_file_init(ConfidentialGuestSupport *cgs, Error **errp);
+int igvm_process(ConfidentialGuestSupport *cgs, Error **erp);
+
+#else
+
+static inline int igvm_file_init(ConfidentialGuestSupport *cgs, Error **errp)
+{
+ return 0;
+}
+
+static inline int igvm_process(ConfidentialGuestSupport *cgs, Error **errp)
+{
+}
+
+#endif
+
+#endif
--
2.43.0
- [PATCH v2 04/10] backends/igvm: Implement parsing and processing of IGVM files,
Roy Hopkins <=