From: Brijesh Singh <brijesh.si...@amd.com>
The sev_load_incoming_page() provide the implementation to read the
incoming guest private pages from the socket and load it into the guest
memory. The routines uses the RECEIVE_START command to create the
incoming encryption context on the first call then uses the
RECEIEVE_UPDATE_DATA command to load the encrypted pages into the guest
memory. After migration is completed, we issue the RECEIVE_FINISH command
to transition the SEV guest to the runnable state so that it can be
executed.
Signed-off-by: Brijesh Singh <brijesh.si...@amd.com>
Co-developed-by: Ashish Kalra <ashish.ka...@amd.com>
Signed-off-by: Ashish Kalra <ashish.ka...@amd.com>
---
include/sysemu/sev.h | 1 +
target/i386/sev.c | 137 ++++++++++++++++++++++++++++++++++++++-
target/i386/trace-events | 3 +
3 files changed, 140 insertions(+), 1 deletion(-)
diff --git a/include/sysemu/sev.h b/include/sysemu/sev.h
index aa6b91a53e..faa02bdd3d 100644
--- a/include/sysemu/sev.h
+++ b/include/sysemu/sev.h
@@ -23,6 +23,7 @@ int sev_encrypt_flash(uint8_t *ptr, uint64_t len, Error
**errp);
int sev_save_setup(MigrationParameters *p);
int sev_save_outgoing_page(QEMUFile *f, uint8_t *ptr,
uint32_t size, uint64_t *bytes_sent);
+int sev_load_incoming_page(QEMUFile *f, uint8_t *ptr);
int sev_inject_launch_secret(const char *hdr, const char *secret,
uint64_t gpa, Error **errp);
diff --git a/target/i386/sev.c b/target/i386/sev.c
index 411bd657e8..1901c9ade4 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -132,6 +132,7 @@ static const char *const sev_fw_errlist[] = {
static struct ConfidentialGuestMemoryEncryptionOps sev_memory_encryption_ops =
{
.save_setup = sev_save_setup,
.save_outgoing_page = sev_save_outgoing_page,
+ .load_incoming_page = sev_load_incoming_page,
};
static int
@@ -778,13 +779,33 @@ sev_launch_finish(SevGuestState *sev)
}
}
+static int
+sev_receive_finish(SevGuestState *s)
+{
+ int error, ret = 1;
+
+ trace_kvm_sev_receive_finish();
+ ret = sev_ioctl(s->sev_fd, KVM_SEV_RECEIVE_FINISH, 0, &error);
+ if (ret) {
+ error_report("%s: RECEIVE_FINISH ret=%d fw_error=%d '%s'",
+ __func__, ret, error, fw_error_to_str(error));
+ goto err;
+ }
+
+ sev_set_guest_state(s, SEV_STATE_RUNNING);
+err:
+ return ret;
+}
+
static void
sev_vm_state_change(void *opaque, bool running, RunState state)
{
SevGuestState *sev = opaque;
if (running) {
- if (!sev_check_state(sev, SEV_STATE_RUNNING)) {
+ if (sev_check_state(sev, SEV_STATE_RECEIVE_UPDATE)) {
+ sev_receive_finish(sev);
+ } else if (!sev_check_state(sev, SEV_STATE_RUNNING)) {
sev_launch_finish(sev);
}
}
@@ -1364,6 +1385,120 @@ int sev_save_outgoing_page(QEMUFile *f, uint8_t *ptr,
return sev_send_update_data(s, f, ptr, sz, bytes_sent);
}
+static int
+sev_receive_start(SevGuestState *sev, QEMUFile *f)
+{
+ int ret = 1;
+ int fw_error;
+ struct kvm_sev_receive_start start = { };
+ gchar *session = NULL, *pdh_cert = NULL;
+
+ /* get SEV guest handle */
+ start.handle = object_property_get_int(OBJECT(sev), "handle",
+ &error_abort);
+
+ /* get the source policy */
+ start.policy = qemu_get_be32(f);
+
+ /* get source PDH key */
+ start.pdh_len = qemu_get_be32(f);
+ if (!check_blob_length(start.pdh_len)) {
+ return 1;
+ }
+
+ pdh_cert = g_new(gchar, start.pdh_len);
+ qemu_get_buffer(f, (uint8_t *)pdh_cert, start.pdh_len);
+ start.pdh_uaddr = (uintptr_t)pdh_cert;
+
+ /* get source session data */
+ start.session_len = qemu_get_be32(f);
+ if (!check_blob_length(start.session_len)) {
+ return 1;
+ }
+ session = g_new(gchar, start.session_len);
+ qemu_get_buffer(f, (uint8_t *)session, start.session_len);
+ start.session_uaddr = (uintptr_t)session;
+
+ trace_kvm_sev_receive_start(start.policy, session, pdh_cert);
+
+ ret = sev_ioctl(sev_guest->sev_fd, KVM_SEV_RECEIVE_START,
+ &start, &fw_error);
+ if (ret < 0) {
+ error_report("Error RECEIVE_START ret=%d fw_error=%d '%s'",
+ ret, fw_error, fw_error_to_str(fw_error));
+ goto err;
+ }
+
+ object_property_set_int(OBJECT(sev), "handle", start.handle, &error_abort);
+ sev_set_guest_state(sev, SEV_STATE_RECEIVE_UPDATE);
+err:
+ g_free(session);
+ g_free(pdh_cert);
+
+ return ret;
+}
+
+static int sev_receive_update_data(QEMUFile *f, uint8_t *ptr)
+{
+ int ret = 1, fw_error = 0;
+ gchar *hdr = NULL, *trans = NULL;
+ struct kvm_sev_receive_update_data update = {};
+
+ /* get packet header */
+ update.hdr_len = qemu_get_be32(f);
+ if (!check_blob_length(update.hdr_len)) {
+ return 1;
+ }
+
+ hdr = g_new(gchar, update.hdr_len);
+ qemu_get_buffer(f, (uint8_t *)hdr, update.hdr_len);
+ update.hdr_uaddr = (uintptr_t)hdr;
+
+ /* get transport buffer */
+ update.trans_len = qemu_get_be32(f);
+ if (!check_blob_length(update.trans_len)) {
+ goto err;
+ }
+
+ trans = g_new(gchar, update.trans_len);
+ update.trans_uaddr = (uintptr_t)trans;
+ qemu_get_buffer(f, (uint8_t *)update.trans_uaddr, update.trans_len);
+
+ update.guest_uaddr = (uintptr_t) ptr;
+ update.guest_len = update.trans_len;
+
+ trace_kvm_sev_receive_update_data(trans, ptr, update.guest_len,
+ hdr, update.hdr_len);
+
+ ret = sev_ioctl(sev_guest->sev_fd, KVM_SEV_RECEIVE_UPDATE_DATA,
+ &update, &fw_error);
+ if (ret) {
+ error_report("Error RECEIVE_UPDATE_DATA ret=%d fw_error=%d '%s'",
+ ret, fw_error, fw_error_to_str(fw_error));
+ goto err;
+ }
+err:
+ g_free(trans);
+ g_free(hdr);
+ return ret;
+}
+
+int sev_load_incoming_page(QEMUFile *f, uint8_t *ptr)
+{
+ SevGuestState *s = sev_guest;
+
+ /*
+ * If this is first buffer and SEV is not in recieiving state then
+ * use RECEIVE_START command to create a encryption context.
+ */
+ if (!sev_check_state(s, SEV_STATE_RECEIVE_UPDATE) &&
+ sev_receive_start(s, f)) {
+ return 1;
+ }
+
+ return sev_receive_update_data(f, ptr);
+}
+
static void
sev_register_types(void)
{
diff --git a/target/i386/trace-events b/target/i386/trace-events
index e8d4aec125..475de65ad4 100644
--- a/target/i386/trace-events
+++ b/target/i386/trace-events
@@ -14,3 +14,6 @@ kvm_sev_attestation_report(const char *mnonce, const char
*data) "mnonce %s data
kvm_sev_send_start(uint64_t pdh, int l1, uint64_t plat, int l2, uint64_t amd,
int l3) "pdh 0x%" PRIx64 " len %d plat 0x%" PRIx64 " len %d amd 0x%" PRIx64 "
len %d"
kvm_sev_send_update_data(void *src, void *dst, int len) "guest %p trans %p len
%d"
kvm_sev_send_finish(void) ""
+kvm_sev_receive_start(int policy, void *session, void *pdh) "policy 0x%x
session %p pdh %p"
+kvm_sev_receive_update_data(void *src, void *dst, int len, void *hdr, int
hdr_len) "guest %p trans %p len %d hdr %p hdr_len %d"
+kvm_sev_receive_finish(void) ""
--
2.17.1
