@@ -39,8 +39,10 @@
#include "qapi/qapi-commands-misc-target.h"
#include "confidential-guest.h"
#include "hw/i386/pc.h"
+#include "hw/i386/e820_memory_layout.h"
#include "exec/address-spaces.h"
#include "qemu/queue.h"
+#include "qemu/cutils.h"
OBJECT_DECLARE_TYPE(SevCommonState, SevCommonStateClass, SEV_COMMON)
OBJECT_DECLARE_TYPE(SevGuestState, SevCommonStateClass, SEV_GUEST)
@@ -49,6 +51,9 @@ OBJECT_DECLARE_TYPE(SevSnpGuestState, SevCommonStateClass, SEV_SNP_GUEST)
/* hard code sha256 digest size */
#define HASH_SIZE 32
+/* Hard coded GPA that KVM uses for the VMSA */
+#define KVM_VMSA_GPA 0xFFFFFFFFF000
+
/* Convert between SEV-ES VMSA and SegmentCache flags/attributes */
#define FLAGS_VMSA_TO_SEGCACHE(flags) \
((((flags) & 0xff00) << 12) | (((flags) & 0xff) << 8))
@@ -487,6 +492,103 @@ static void sev_apply_cpu_context(CPUState *cpu)
}
}
+static int check_vmsa_supported(hwaddr gpa, const struct sev_es_save_area *vmsa,
+ Error **errp)
+{
+ struct sev_es_save_area vmsa_check;
+
+ /*
+ * KVM always populates the VMSA at a fixed GPA which cannot be modified
+ * from userspace. Specifying a different GPA will not prevent the guest
+ * from starting but will cause the launch measurement to be different
+ * from expected. Therefore check that the provided GPA matches the KVM
+ * hardcoded value.
+ */
+ if (gpa != KVM_VMSA_GPA) {
+ error_setg(errp,
+ "%s: The VMSA GPA must be %lX but is specified as %lX",
+ __func__, KVM_VMSA_GPA, gpa);
+ return -1;
+ }
+
+ /*
+ * Clear all supported fields so we can then check the entire structure
+ * is zero.
+ */
+ memcpy(&vmsa_check, vmsa, sizeof(struct sev_es_save_area));
+ memset(&vmsa_check.es, 0, sizeof(vmsa_check.es));
+ memset(&vmsa_check.cs, 0, sizeof(vmsa_check.cs));
+ memset(&vmsa_check.ss, 0, sizeof(vmsa_check.ss));
+ memset(&vmsa_check.ds, 0, sizeof(vmsa_check.ds));
+ memset(&vmsa_check.fs, 0, sizeof(vmsa_check.fs));
+ memset(&vmsa_check.gs, 0, sizeof(vmsa_check.gs));
+ memset(&vmsa_check.gdtr, 0, sizeof(vmsa_check.gdtr));
+ memset(&vmsa_check.idtr, 0, sizeof(vmsa_check.idtr));
+ memset(&vmsa_check.ldtr, 0, sizeof(vmsa_check.ldtr));
+ memset(&vmsa_check.tr, 0, sizeof(vmsa_check.tr));
+ vmsa_check.efer = 0;
+ vmsa_check.cr0 = 0;
+ vmsa_check.cr3 = 0;
+ vmsa_check.cr4 = 0;
+ vmsa_check.xcr0 = 0;
+ vmsa_check.dr6 = 0;
+ vmsa_check.dr7 = 0;
+ vmsa_check.rax = 0;
+ vmsa_check.rcx = 0;
+ vmsa_check.rdx = 0;
+ vmsa_check.rbx = 0;
+ vmsa_check.rsp = 0;
+ vmsa_check.rbp = 0;
+ vmsa_check.rsi = 0;
+ vmsa_check.rdi = 0;
+ vmsa_check.r8 = 0;
+ vmsa_check.r9 = 0;
+ vmsa_check.r10 = 0;
+ vmsa_check.r11 = 0;
+ vmsa_check.r12 = 0;
+ vmsa_check.r13 = 0;
+ vmsa_check.r14 = 0;
+ vmsa_check.r15 = 0;
+ vmsa_check.rip = 0;
+ vmsa_check.rflags = 0;
+
+ vmsa_check.g_pat = 0;
+ vmsa_check.xcr0 = 0;
+
+ vmsa_check.x87_fcw = 0;
+ vmsa_check.mxcsr = 0;
+
+ if (sev_snp_enabled()) {
+ if (vmsa_check.sev_features != SVM_SEV_FEAT_SNP_ACTIVE) {
+ error_setg(errp,
+ "%s: sev_features in the VMSA contains an unsupported "
+ "value. For SEV-SNP, sev_features must be set to %x.",
+ __func__, SVM_SEV_FEAT_SNP_ACTIVE);
+ return -1;
+ }
+ vmsa_check.sev_features = 0;
+ } else {
+ if (vmsa_check.sev_features != 0) {
+ error_setg(errp,
+ "%s: sev_features in the VMSA contains an unsupported "
+ "value. For SEV-ES and SEV, sev_features must be "
+ "set to 0.", __func__);
+ return -1;
+ }
+ }
+
+ if (!buffer_is_zero(&vmsa_check, sizeof(vmsa_check))) {
+ error_setg(errp,
+ "%s: The VMSA contains fields that are not "
+ "synchronized with KVM. Continuing would result in "
+ "either unpredictable guest behavior, or a "
+ "mismatched launch measurement.",
+ __func__);
+ return -1;
+ }
+ return 0;
+}
+
static int sev_set_cpu_context(uint16_t cpu_index, const void *ctx,
uint32_t ctx_len, hwaddr gpa, Error **errp)
{
@@ -1498,18 +1600,26 @@ sev_snp_launch_finish(SevCommonState *sev_common)
struct kvm_sev_snp_launch_finish *finish = &sev_snp->kvm_finish_conf;
/*
- * To boot the SNP guest, the hypervisor is required to populate the CPUID
- * and Secrets page before finalizing the launch flow. The location of
- * the secrets and CPUID page is available through the OVMF metadata GUID.
+ * Populate all the metadata pages if not using an IGVM file. In the case
+ * where an IGVM file is provided it will be used to configure the metadata
+ * pages directly.
*/
- metadata = pc_system_get_ovmf_sev_metadata_ptr();
- if (metadata == NULL) {
- error_report("%s: Failed to locate SEV metadata header", __func__);
- exit(1);
- }
+ if (!X86_MACHINE(qdev_get_machine())->igvm) {
+ /*
+ * To boot the SNP guest, the hypervisor is required to populate the
+ * CPUID and Secrets page before finalizing the launch flow. The
+ * location of the secrets and CPUID page is available through the
+ * OVMF metadata GUID.
+ */
+ metadata = pc_system_get_ovmf_sev_metadata_ptr();
+ if (metadata == NULL) {
+ error_report("%s: Failed to locate SEV metadata header", __func__);
+ exit(1);
+ }
- /* Populate all the metadata pages */
- snp_populate_metadata_pages(sev_snp, metadata);
+ /* Populate all the metadata pages */
+ snp_populate_metadata_pages(sev_snp, metadata);
+ }
QTAILQ_FOREACH(data, &launch_update, next) {
ret = sev_snp_launch_update(sev_snp, data);
@@ -2298,6 +2408,124 @@ static void sev_common_set_kernel_hashes(Object *obj, bool value, Error **errp)
SEV_COMMON(obj)->kernel_hashes = value;
}
+static bool cgs_check_support(ConfidentialGuestPlatformType platform,
+ uint16_t platform_version, uint8_t highest_vtl,
+ uint64_t shared_gpa_boundary)
+{
+ return (((platform == CGS_PLATFORM_SEV_SNP) && sev_snp_enabled()) ||
+ ((platform == CGS_PLATFORM_SEV_ES) && sev_es_enabled()) ||
+ ((platform == CGS_PLATFORM_SEV) && sev_enabled()));
+}
+
+static int cgs_set_guest_state(hwaddr gpa, uint8_t *ptr, uint64_t len,
+ ConfidentialGuestPageType memory_type,
+ uint16_t cpu_index, Error **errp)
+{
+ SevCommonState *sev_common = SEV_COMMON(MACHINE(qdev_get_machine())->cgs);
+ SevCommonStateClass *klass = SEV_COMMON_GET_CLASS(sev_common);
+
+ if (!sev_enabled()) {
+ error_setg(errp, "%s: attempt to configure guest memory, but SEV "
+ "is not enabled", __func__);
+ return -1;
+ }
+
+ switch (memory_type) {
+ case CGS_PAGE_TYPE_NORMAL:
+ case CGS_PAGE_TYPE_ZERO:
+ return klass->launch_update_data(sev_common, gpa, ptr, len, errp);
+
+ case CGS_PAGE_TYPE_VMSA:
+ if (!sev_es_enabled()) {
+ error_setg(errp,
+ "%s: attempt to configure initial VMSA, but SEV-ES "
+ "is not supported",
+ __func__);
+ return -1;
+ }
+ if (check_vmsa_supported(gpa, (const struct sev_es_save_area *)ptr,
+ errp) < 0) {
+ return -1;
+ }
+ return sev_set_cpu_context(cpu_index, ptr, len, gpa, errp);
+
+ case CGS_PAGE_TYPE_UNMEASURED:
+ if (sev_snp_enabled()) {
+ return snp_launch_update_data(
+ gpa, ptr, len, KVM_SEV_SNP_PAGE_TYPE_UNMEASURED, errp);
+ }
+ /* No action required if not SEV-SNP */
+ return 0;
+
+ case CGS_PAGE_TYPE_SECRETS:
+ if (!sev_snp_enabled()) {
+ error_setg(errp,
+ "%s: attempt to configure secrets page, but SEV-SNP "
+ "is not supported",
+ __func__);
+ return -1;
+ }
+ return snp_launch_update_data(gpa, ptr, len,
+ KVM_SEV_SNP_PAGE_TYPE_SECRETS, errp);
+
+ case CGS_PAGE_TYPE_REQUIRED_MEMORY:
+ if (kvm_convert_memory(gpa, len, true) < 0) {
+ error_setg(
+ errp,
+ "%s: failed to configure required memory. gpa: %lX, type: %d",
+ __func__, gpa, memory_type);
+ return -1;
+ }
+ return 0;
+
+ case CGS_PAGE_TYPE_CPUID:
+ if (!sev_snp_enabled()) {
+ error_setg(errp,
+ "%s: attempt to configure CPUID page, but SEV-SNP "
+ "is not supported",
+ __func__);
+ return -1;
+ }
+ return snp_launch_update_cpuid(gpa, ptr, len, errp);
+ }
+ error_setg(errp, "%s: failed to update guest. gpa: %lX, type: %d", __func__,
+ gpa, memory_type);
+ return -1;
+}
+
+static int cgs_get_mem_map_entry(int index,
+ ConfidentialGuestMemoryMapEntry *entry,
+ Error **errp)
+{
+ struct e820_entry *table;
+ int num_entries;
+
+ num_entries = e820_get_table(&table);
+ if ((index < 0) || (index >= num_entries)) {
+ return 1;
+ }
+ entry->gpa = table[index].address;
+ entry->size = table[index].length;
+ switch (table[index].type) {
+ case E820_RAM:
+ entry->type = CGS_MEM_RAM;
+ break;
+ case E820_RESERVED:
+ entry->type = CGS_MEM_RESERVED;
+ break;
+ case E820_ACPI:
+ entry->type = CGS_MEM_ACPI;
+ break;
+ case E820_NVS:
+ entry->type = CGS_MEM_NVS;
+ break;
+ case E820_UNUSABLE:
+ entry->type = CGS_MEM_UNUSABLE;
+ break;
+ }
+ return 0;
+}
+
static void
sev_common_class_init(ObjectClass *oc, void *data)
{
@@ -2321,6 +2549,8 @@ static void
sev_common_instance_init(Object *obj)
{
SevCommonState *sev_common = SEV_COMMON(obj);
+ ConfidentialGuestSupportClass *cgs =
+ CONFIDENTIAL_GUEST_SUPPORT_GET_CLASS(obj);
sev_common->kvm_type = -1;
@@ -2331,6 +2561,10 @@ sev_common_instance_init(Object *obj)
object_property_add_uint32_ptr(obj, "reduced-phys-bits",
&sev_common->reduced_phys_bits,
OBJ_PROP_FLAG_READWRITE);
+ cgs->check_support = cgs_check_support;
+ cgs->set_guest_state = cgs_set_guest_state;
+ cgs->get_mem_map_entry = cgs_get_mem_map_entry;
+
QTAILQ_INIT(&sev_common->launch_vmsa);
}
@@ -34,6 +34,8 @@
#define SEV_SNP_POLICY_SMT 0x10000
#define SEV_SNP_POLICY_DBG 0x80000
+#define SVM_SEV_FEAT_SNP_ACTIVE 1
+
typedef struct SevKernelLoaderContext {
char *setup_data;
size_t setup_size;