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[Qemu-devel] [PATCH v11 18/28] sev/i386: add support to LAUNCH_MEASURE c
From: |
Brijesh Singh |
Subject: |
[Qemu-devel] [PATCH v11 18/28] sev/i386: add support to LAUNCH_MEASURE command |
Date: |
Wed, 7 Mar 2018 10:50:28 -0600 |
During machine creation we encrypted the guest bios image, the
LAUNCH_MEASURE command can be used to retrieve the measurement of
the encrypted memory region. This measurement is a signature of
the memory contents that can be sent to the guest owner as an
attestation that the memory was encrypted correctly by the firmware.
VM management tools like libvirt can query the measurement using
query-sev-launch-measure QMP command.
Cc: Paolo Bonzini <address@hidden>
Cc: Richard Henderson <address@hidden>
Cc: Eduardo Habkost <address@hidden>
Signed-off-by: Brijesh Singh <address@hidden>
---
target/i386/sev-stub.c | 5 ++++
target/i386/sev.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++
target/i386/sev_i386.h | 2 ++
target/i386/trace-events | 1 +
4 files changed, 71 insertions(+)
diff --git a/target/i386/sev-stub.c b/target/i386/sev-stub.c
index c86d8c139237..2f61c32ec975 100644
--- a/target/i386/sev-stub.c
+++ b/target/i386/sev-stub.c
@@ -39,3 +39,8 @@ uint32_t sev_get_reduced_phys_bits(void)
{
return 0;
}
+
+char *sev_get_launch_measurement(void)
+{
+ return NULL;
+}
diff --git a/target/i386/sev.c b/target/i386/sev.c
index 6a5f026e8fc6..e01c753be3ec 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -511,6 +511,68 @@ sev_launch_update_data(uint8_t *addr, uint64_t len)
return ret;
}
+static void
+sev_launch_get_measure(Notifier *notifier, void *unused)
+{
+ int ret, error;
+ guchar *data;
+ SEVState *s = sev_state;
+ struct kvm_sev_launch_measure *measurement;
+
+ if (!sev_check_state(SEV_STATE_LUPDATE)) {
+ return;
+ }
+
+ measurement = g_new0(struct kvm_sev_launch_measure, 1);
+
+ /* query the measurement blob length */
+ ret = sev_ioctl(sev_state->sev_fd, KVM_SEV_LAUNCH_MEASURE,
+ measurement, &error);
+ if (!measurement->len) {
+ error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
+ __func__, ret, error, fw_error_to_str(errno));
+ goto free_measurement;
+ }
+
+ data = g_new0(guchar, measurement->len);
+ measurement->uaddr = (unsigned long)data;
+
+ /* get the measurement blob */
+ ret = sev_ioctl(sev_state->sev_fd, KVM_SEV_LAUNCH_MEASURE,
+ measurement, &error);
+ if (ret) {
+ error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
+ __func__, ret, error, fw_error_to_str(errno));
+ goto free_data;
+ }
+
+ sev_set_guest_state(SEV_STATE_LSECRET);
+
+ /* encode the measurement value and emit the event */
+ s->measurement = g_base64_encode(data, measurement->len);
+ trace_kvm_sev_launch_measurement(s->measurement);
+
+free_data:
+ g_free(data);
+free_measurement:
+ g_free(measurement);
+}
+
+char *
+sev_get_launch_measurement(void)
+{
+ if (sev_state &&
+ sev_state->state >= SEV_STATE_LSECRET) {
+ return g_strdup(sev_state->measurement);
+ }
+
+ return NULL;
+}
+
+static Notifier sev_machine_done_notify = {
+ .notify = sev_launch_get_measure,
+};
+
void *
sev_guest_init(const char *id)
{
@@ -588,6 +650,7 @@ sev_guest_init(const char *id)
}
ram_block_notifier_add(&sev_ram_notifier);
+ qemu_add_machine_init_done_notifier(&sev_machine_done_notify);
return s;
err:
diff --git a/target/i386/sev_i386.h b/target/i386/sev_i386.h
index c06be12c8079..c21d1f31d712 100644
--- a/target/i386/sev_i386.h
+++ b/target/i386/sev_i386.h
@@ -42,6 +42,7 @@ extern uint64_t sev_get_me_mask(void);
extern SevInfo *sev_get_info(void);
extern uint32_t sev_get_cbit_position(void);
extern uint32_t sev_get_reduced_phys_bits(void);
+extern char *sev_get_launch_measurement(void);
typedef struct QSevGuestInfo QSevGuestInfo;
typedef struct QSevGuestInfoClass QSevGuestInfoClass;
@@ -83,6 +84,7 @@ struct SEVState {
uint32_t handle;
int sev_fd;
SevState state;
+ gchar *measurement;
};
typedef struct SEVState SEVState;
diff --git a/target/i386/trace-events b/target/i386/trace-events
index c0cd8e93217f..f7a1a1e6b85c 100644
--- a/target/i386/trace-events
+++ b/target/i386/trace-events
@@ -13,3 +13,4 @@ kvm_memcrypt_unregister_region(void *addr, size_t len) "addr
%p len 0x%lu"
kvm_sev_change_state(const char *old, const char *new) "%s -> %s"
kvm_sev_launch_start(int policy, void *session, void *pdh) "policy 0x%x
session %p pdh %p"
kvm_sev_launch_update_data(void *addr, uint64_t len) "addr %p len 0x%" PRIu64
+kvm_sev_launch_measurement(const char *value) "data %s"
--
2.14.3
- [Qemu-devel] [PATCH v11 05/28] machine: add -memory-encryption property, (continued)
- [Qemu-devel] [PATCH v11 05/28] machine: add -memory-encryption property, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 07/28] docs: add AMD Secure Encrypted Virtualization (SEV), Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 09/28] qmp: add query-sev command, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 08/28] target/i386: add Secure Encrypted Virtulization (SEV) object, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 12/28] sev/i386: register the guest memory range which may contain encrypted data, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 10/28] include: add psp-sev.h header file, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 15/28] sev/i386: add command to create launch memory encryption context, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 20/28] hw/i386: set ram_debug_ops when memory encryption is enabled, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 19/28] sev/i386: finalize the SEV guest launch flow, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 16/28] sev/i386: add command to encrypt guest memory region, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 18/28] sev/i386: add support to LAUNCH_MEASURE command,
Brijesh Singh <=
- [Qemu-devel] [PATCH v11 23/28] qmp: add query-sev-launch-measure command, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 11/28] sev/i386: add command to initialize the memory encryption context, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 14/28] hmp: add 'info sev' command, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 13/28] kvm: introduce memory encryption APIs, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 17/28] target/i386: encrypt bios rom, Brijesh Singh, 2018/03/07
- [Qemu-devel] [PATCH v11 21/28] sev/i386: add debug encrypt and decrypt commands, Brijesh Singh, 2018/03/07