In preparation for supporting the processing of IGVM files to configure
guests, this adds a set of functions to ConfidentialGuestSupport
allowing configuration of secure virtual machines that can be
implemented for each supported isolation platform type such as Intel TDX
or AMD SEV-SNP. These functions will be called by IGVM processing code
in subsequent patches.
This commit provides a default implementation of the functions that
either perform no action or generate a warning or error when they are
called. Targets that support ConfidentalGuestSupport should override
these implementations.
Signed-off-by: Roy Hopkins <roy.hopk...@suse.com>
---
backends/confidential-guest-support.c | 32 ++++++++++
include/exec/confidential-guest-support.h | 74 +++++++++++++++++++++++
2 files changed, 106 insertions(+)
diff --git a/backends/confidential-guest-support.c
b/backends/confidential-guest-support.c
index da436fb736..cb0bc543c0 100644
--- a/backends/confidential-guest-support.c
+++ b/backends/confidential-guest-support.c
@@ -14,6 +14,8 @@
#include "qemu/osdep.h"
#include "exec/confidential-guest-support.h"
+#include "qemu/error-report.h"
+#include "qapi/error.h"
OBJECT_DEFINE_ABSTRACT_TYPE(ConfidentialGuestSupport,
confidential_guest_support,
@@ -45,8 +47,38 @@ static void
confidential_guest_support_class_init(ObjectClass *oc, void *data)
#endif
}
+static int check_support(ConfidentialGuestPlatformType platform,
+ uint16_t platform_version, uint8_t highest_vtl,
+ uint64_t shared_gpa_boundary)
+{
+ /* Default: no support. */
+ return 0;
+}
+
+static int set_guest_state(hwaddr gpa, uint8_t *ptr, uint64_t len,
+ ConfidentialGuestPageType memory_type,
+ uint16_t cpu_index, Error **errp)
+{
+ error_setg(errp,
+ "Setting confidential guest state is not supported for this
platform");
+ return -1;
+}
+
+static int get_mem_map_entry(int index, ConfidentialGuestMemoryMapEntry *entry,
+ Error **errp)
+{
+ error_setg(
+ errp,
+ "Obtaining the confidential guest memory map is not supported for this
platform");
+ return -1;
+}
+
static void confidential_guest_support_init(Object *obj)
{
+ ConfidentialGuestSupport *cgs = CONFIDENTIAL_GUEST_SUPPORT(obj);
+ cgs->check_support = check_support;
+ cgs->set_guest_state = set_guest_state;
+ cgs->get_mem_map_entry = get_mem_map_entry;
}
static void confidential_guest_support_finalize(Object *obj)
diff --git a/include/exec/confidential-guest-support.h
b/include/exec/confidential-guest-support.h
index ec74da8877..a8ad84fa07 100644
--- a/include/exec/confidential-guest-support.h
+++ b/include/exec/confidential-guest-support.h
@@ -21,10 +21,44 @@
#ifndef CONFIG_USER_ONLY
#include "qom/object.h"
+#include "exec/hwaddr.h"
+
+#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)
+typedef enum ConfidentialGuestPlatformType {
+ CGS_PLATFORM_SEV,
+ CGS_PLATFORM_SEV_ES,
+} ConfidentialGuestPlatformType;
+
+typedef enum ConfidentialGuestMemoryType {
+ CGS_MEM_RAM,
+ CGS_MEM_RESERVED,
+ CGS_MEM_ACPI,
+ CGS_MEM_NVS,
+ CGS_MEM_UNUSABLE,
+} ConfidentialGuestMemoryType;
+
+typedef struct ConfidentialGuestMemoryMapEntry {
+ uint64_t gpa;
+ uint64_t size;
+ ConfidentialGuestMemoryType type;
+} ConfidentialGuestMemoryMapEntry;
+
+typedef enum ConfidentialGuestPageType {
+ CGS_PAGE_TYPE_NORMAL,
+ CGS_PAGE_TYPE_VMSA,
+ CGS_PAGE_TYPE_ZERO,
+ CGS_PAGE_TYPE_UNMEASURED,
+ CGS_PAGE_TYPE_SECRETS,
+ CGS_PAGE_TYPE_CPUID,
+ CGS_PAGE_TYPE_REQUIRED_MEMORY,
+} ConfidentialGuestPageType;
+
struct ConfidentialGuestSupport {
Object parent;
@@ -60,6 +94,46 @@ struct ConfidentialGuestSupport {
*/
char *igvm_filename;
#endif
+
+ /*
+ * The following virtual methods need to be implemented by systems that
+ * support confidential guests that can be configured with IGVM and are
+ * used during processing of the IGVM file with process_igvm().
+ */
+
+ /*
+ * Check for to see if this confidential guest supports a particular
+ * platform or configuration
+ */
+ int (*check_support)(ConfidentialGuestPlatformType platform,
+ uint16_t platform_version, uint8_t highest_vtl,
+ uint64_t shared_gpa_boundary);
+
+ /*
+ * Configure part of the state of a guest for a particular set of data,
page
+ * type and gpa. This can be used for example to pre-populate and measure
+ * guest memory contents, define private ranges or set the initial CPU
state
+ * for one or more CPUs.
+ *
+ * If memory_type is CGS_PAGE_TYPE_VMSA then ptr points to the initial CPU
+ * context for a virtual CPU. The format of the data depends on the type of
+ * confidential virtual machine. For example, for SEV-ES ptr will point to
a
+ * vmcb_save_area structure that should be copied into guest memory at the
+ * address specified in gpa. The cpu_index parameter contains the index of
+ * the CPU the VMSA applies to.
+ */
+ int (*set_guest_state)(hwaddr gpa, uint8_t *ptr, uint64_t len,
+ ConfidentialGuestPageType memory_type,
+ uint16_t cpu_index, Error **errp);
+
+ /*
+ * Iterate the system memory map, getting the entry with the given index
+ * that can be populated into guest memory.
+ *
+ * Returns 0 for ok, 1 if the index is out of range and -1 on error.
+ */
+ int (*get_mem_map_entry)(int index, ConfidentialGuestMemoryMapEntry *entry,
+ Error **errp);
};
typedef struct ConfidentialGuestSupportClass {
--
2.43.0
