For confidential guests a policy can be provided that defines the
security level, debug status, expected launch measurement and other
parameters that define the configuration of the confidential platform.
This commit adds a new function named set_guest_policy() that can be
implemented by each confidential platform, such as AMD SEV to set the
policy. This will allow configuration of the policy from a
multi-platform resource such as an IGVM file without the IGVM processor
requiring specific implementation details for each platform.
Signed-off-by: Roy Hopkins <roy.hopkins@suse.com>
---
include/exec/confidential-guest-support.h | 21 +++++++++++++++++++++
backends/confidential-guest-support.c | 12 ++++++++++++
2 files changed, 33 insertions(+)
diff --git a/include/exec/confidential-guest-support.h b/include/exec/confidential-guest-support.h
index 4834efbe38..218bab9714 100644
--- a/include/exec/confidential-guest-support.h
+++ b/include/exec/confidential-guest-support.h
@@ -59,6 +59,10 @@ typedef enum ConfidentialGuestPageType {
CGS_PAGE_TYPE_REQUIRED_MEMORY,
} ConfidentialGuestPageType;
+typedef enum ConfidentialGuestPolicyType {
+ GUEST_POLICY_SEV,
+} ConfidentialGuestPolicyType;
+
struct ConfidentialGuestSupport {
Object parent;
@@ -123,6 +127,23 @@ typedef struct ConfidentialGuestSupportClass {
ConfidentialGuestPageType memory_type,
uint16_t cpu_index, Error **errp);
+ /*
+ * Set the guest policy. The policy can be used to configure the
+ * confidential platform, such as if debug is enabled or not and can contain
+ * information about expected launch measurements, signed verification of
+ * guest configuration and other platform data.
+ *
+ * The format of the policy data is specific to each platform. For example,
+ * SEV-SNP uses a policy bitfield in the 'policy' argument and provides an
+ * ID block and ID authentication in the 'policy_data' parameters. The type
+ * of policy data is identified by the 'policy_type' argument.
+ */
+ int (*set_guest_policy)(ConfidentialGuestPolicyType policy_type,
+ uint64_t policy,
+ void *policy_data1, uint32_t policy_data1_size,
+ void *policy_data2, uint32_t policy_data2_size,
+ Error **errp);
+
/*
* Iterate the system memory map, getting the entry with the given index
* that can be populated into guest memory.
diff --git a/backends/confidential-guest-support.c b/backends/confidential-guest-support.c
index 68e6fd9d18..3c46b2cd6b 100644
--- a/backends/confidential-guest-support.c
+++ b/backends/confidential-guest-support.c
@@ -38,6 +38,17 @@ static int set_guest_state(hwaddr gpa, uint8_t *ptr, uint64_t len,
return -1;
}
+static int set_guest_policy(ConfidentialGuestPolicyType policy_type,
+ uint64_t policy,
+ void *policy_data1, uint32_t policy_data1_size,
+ void *policy_data2, uint32_t policy_data2_size,
+ Error **errp)
+{
+ error_setg(errp,
+ "Setting confidential guest policy is not supported for this platform");
+ return -1;
+}
+
static int get_mem_map_entry(int index, ConfidentialGuestMemoryMapEntry *entry,
Error **errp)
{
@@ -52,6 +63,7 @@ static void confidential_guest_support_class_init(ObjectClass *oc, void *data)
ConfidentialGuestSupportClass *cgsc = CONFIDENTIAL_GUEST_SUPPORT_CLASS(oc);
cgsc->check_support = check_support;
cgsc->set_guest_state = set_guest_state;
+ cgsc->set_guest_policy = set_guest_policy;
cgsc->get_mem_map_entry = get_mem_map_entry;
}
--
2.43.0