From: Brijesh Singh <brijesh.si...@amd.com>
OVMF reserves various pages so they can be pre-initialized/validated
prior to launching the guest. Add support for populating these pages
with the expected content.
Signed-off-by: Brijesh Singh <brijesh.si...@amd.com>
Signed-off-by: Michael Roth <michael.r...@amd.com>
Co-developed-by: Pankaj Gupta <pankaj.gu...@amd.com>
Signed-off-by: Pankaj Gupta <pankaj.gu...@amd.com>
Message-ID: <20240530111643.1091816-20-pankaj.gu...@amd.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
target/i386/sev.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 74 insertions(+)
diff --git a/target/i386/sev.c b/target/i386/sev.c
index 17281bb2c74..c57534fca2b 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -1003,15 +1003,89 @@ sev_launch_finish(SevCommonState *sev_common)
migrate_add_blocker(&sev_mig_blocker, &error_fatal);
}
+static int
+snp_launch_update_data(uint64_t gpa, void *hva, uint32_t len, int type)
+{
+ SevLaunchUpdateData *data;
+
+ data = g_new0(SevLaunchUpdateData, 1);
+ data->gpa = gpa;
+ data->hva = hva;
+ data->len = len;
+ data->type = type;
+
+ QTAILQ_INSERT_TAIL(&launch_update, data, next);
+
+ return 0;
+}
+
+static int
+snp_metadata_desc_to_page_type(int desc_type)
+{
+ switch (desc_type) {
+ /* Add the umeasured prevalidated pages as a zero page */
+ case SEV_DESC_TYPE_SNP_SEC_MEM: return KVM_SEV_SNP_PAGE_TYPE_ZERO;
+ case SEV_DESC_TYPE_SNP_SECRETS: return KVM_SEV_SNP_PAGE_TYPE_SECRETS;
+ case SEV_DESC_TYPE_CPUID: return KVM_SEV_SNP_PAGE_TYPE_CPUID;
+ default:
+ return KVM_SEV_SNP_PAGE_TYPE_ZERO;
+ }
+}
+
+static void
+snp_populate_metadata_pages(SevSnpGuestState *sev_snp,
+ OvmfSevMetadata *metadata)
+{
+ OvmfSevMetadataDesc *desc;
+ int type, ret, i;
+ void *hva;
+ MemoryRegion *mr = NULL;
+
+ for (i = 0; i < metadata->num_desc; i++) {
+ desc = &metadata->descs[i];
+
+ type = snp_metadata_desc_to_page_type(desc->type);
+
+ hva = gpa2hva(&mr, desc->base, desc->len, NULL);
+ if (!hva) {
+ error_report("%s: Failed to get HVA for GPA 0x%x sz 0x%x",
+ __func__, desc->base, desc->len);
+ exit(1);
+ }
+
+ ret = snp_launch_update_data(desc->base, hva, desc->len, type);
+ if (ret) {
+ error_report("%s: Failed to add metadata page gpa 0x%x+%x type %d",
+ __func__, desc->base, desc->len, desc->type);
+ exit(1);
+ }
+ }
+}
+
static void
sev_snp_launch_finish(SevCommonState *sev_common)
{
int ret, error;
Error *local_err = NULL;
+ OvmfSevMetadata *metadata;
SevLaunchUpdateData *data;
SevSnpGuestState *sev_snp = SEV_SNP_GUEST(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.
+ */
+ 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);
+
QTAILQ_FOREACH(data, &launch_update, next) {
ret = sev_snp_launch_update(sev_snp, data);
if (ret) {
--
2.45.1
