When memory encryption is enabled, KVM_SEV_INIT command is used to
initialize the platform. The command loads the SEV related persistent
data from non-volatile storage and initializes the platform context.
This command should be first issued before invoking any other guest
commands provided by the SEV firmware.
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>
---
accel/kvm/kvm-all.c | 15 +++++
accel/kvm/sev.c | 161 +++++++++++++++++++++++++++++++++++++++++++++++++
accel/kvm/trace-events | 2 +
accel/stubs/kvm-stub.c | 28 +++++++++
include/sysemu/sev.h | 16 +++++
5 files changed, 222 insertions(+)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index f290f487a573..6e5f3fd65066 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -38,6 +38,7 @@
#include "qemu/event_notifier.h"
#include "trace.h"
#include "hw/irq.h"
+#include "sysemu/sev.h"
#include "hw/boards.h"
@@ -103,6 +104,9 @@ struct KVMState
#endif
KVMMemoryListener memory_listener;
QLIST_HEAD(, KVMParkedVcpu) kvm_parked_vcpus;
+
+ /* memory encryption */
+ void *memcrypt_handle;
};
KVMState *kvm_state;
@@ -1632,6 +1636,17 @@ static int kvm_init(MachineState *ms)
kvm_state = s;
+ /*
+ * if memory encryption object is specified then initialize the memory
+ * encryption context.
+ */
+ if (ms->memory_encryption) {
+ kvm_state->memcrypt_handle = sev_guest_init(ms->memory_encryption);
+ if (!kvm_state->memcrypt_handle) {
+ goto err;
+ }
+ }
+
ret = kvm_arch_init(ms, s);
if (ret < 0) {
goto err;
diff --git a/accel/kvm/sev.c b/accel/kvm/sev.c
index 57e092a0bddd..d5fd975792b8 100644
--- a/accel/kvm/sev.c
+++ b/accel/kvm/sev.c
@@ -18,10 +18,74 @@
#include "sysemu/kvm.h"
#include "sysemu/sev.h"
#include "sysemu/sysemu.h"
+#include "trace.h"
#define DEFAULT_GUEST_POLICY 0x1 /* disable debug */
#define DEFAULT_SEV_DEVICE "/dev/sev"
+static uint64_t me_mask;
+static bool sev_active;
+static int sev_fd;
+
+#define SEV_FW_MAX_ERROR 0x17
+
+static const char *const sev_fw_errlist[] = {
+ "",
+ "Platform state is invalid",
+ "Guest state is invalid",
+ "Platform configuration is invalid",
+ "Buffer too small",
+ "Platform is already owned",
+ "Certificate is invalid",
+ "Policy is not allowed",
+ "Guest is not active",
+ "Invalid address",
+ "Bad signature",
+ "Bad measurement",
+ "Asid is already owned",
+ "Invalid ASID",
+ "WBINVD is required",
+ "DF_FLUSH is required",
+ "Guest handle is invalid",
+ "Invalid command",
+ "Guest is active",
+ "Hardware error",
+ "Hardware unsafe",
+ "Feature not supported",
+ "Invalid parameter"
+};
+
+static int
+sev_ioctl(int cmd, void *data, int *error)
+{
+ int r;
+ struct kvm_sev_cmd input;
+
+ memset(&input, 0x0, sizeof(input));
+
+ input.id = cmd;
+ input.sev_fd = sev_fd;
+ input.data = (__u64)data;
+
+ r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, &input);
+
+ if (error) {
+ *error = input.error;
+ }
+
+ return r;
+}
+
+static const char *
+fw_error_to_str(int code)
+{
+ if (code >= SEV_FW_MAX_ERROR) {
+ return "unknown error";
+ }
+
+ return sev_fw_errlist[code];
+}
+
static void
qsev_guest_finalize(Object *obj)
{
@@ -205,6 +269,103 @@ static const TypeInfo qsev_guest_info = {
}
};
+static QSevGuestInfo *
+lookup_sev_guest_info(const char *id)
+{
+ Object *obj;
+ QSevGuestInfo *info;
+
+ obj = object_resolve_path_component(object_get_objects_root(), id);
+ if (!obj) {
+ return NULL;
+ }
+
+ info = (QSevGuestInfo *)
+ object_dynamic_cast(obj, TYPE_QSEV_GUEST_INFO);
+ if (!info) {
+ return NULL;
+ }
+
+ return info;
+}
+
+uint64_t
+sev_get_me_mask(void)
+{
+ return ~me_mask;
+}
+
+void
+sev_get_current_state(char **state)
+{
+}
+
+bool
+sev_enabled(void)
+{
+ return sev_active;
+}
+
+void
+sev_get_fw_version(uint8_t *major, uint8_t *minor, uint8_t *build)
+{
+}
+
+void
+sev_get_policy(uint32_t *policy)
+{
+}
+
+void *
+sev_guest_init(const char *id)
+{
+ SEVState *s;
+ char *devname;
+ int ret, fw_error;
+ uint32_t host_cbitpos, cbitpos;
+
+ s = g_new0(SEVState, 1);
+ s->sev_info = lookup_sev_guest_info(id);
+ if (!s->sev_info) {
+ error_report("%s: '%s' is not a valid '%s' object",
+ __func__, id, TYPE_QSEV_GUEST_INFO);
+ goto err;
+ }
+
+ host_cbitpos = sev_get_host_cbitpos();
+ cbitpos = object_property_get_int(OBJECT(s->sev_info), "cbitpos", NULL);
+ if (host_cbitpos != cbitpos) {
+ error_report("%s: cbitpos check failed, host '%d' request '%d'",
+ __func__, host_cbitpos, cbitpos);
+ goto err;
+ }
+
+ me_mask = (1UL << cbitpos);
+
+ devname = object_property_get_str(OBJECT(s->sev_info), "sev-device", NULL);
+ sev_fd = open(devname, O_RDWR);
+ if (sev_fd < 0) {
+ error_report("%s: Failed to open %s '%s'", __func__,
+ devname, strerror(errno));
+ goto err;
+ }
+ g_free(devname);
+
+ trace_kvm_sev_init();
+ ret = sev_ioctl(KVM_SEV_INIT, NULL, &fw_error);
+ if (ret) {
+ error_report("%s: failed to initialize ret=%d fw_error=%d '%s'",
+ __func__, ret, fw_error, fw_error_to_str(fw_error));
+ goto err;
+ }
+
+ sev_active = true;
+ return s;
+err:
+ g_free(s);
+ return NULL;
+}
+
static void
sev_register_types(void)
{
diff --git a/accel/kvm/trace-events b/accel/kvm/trace-events
index f89ba5578dc1..ea487e5a5913 100644
--- a/accel/kvm/trace-events
+++ b/accel/kvm/trace-events
@@ -13,3 +13,5 @@ kvm_irqchip_add_msi_route(char *name, int vector, int virq) "dev %s vector %d vi
kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d"
kvm_irqchip_release_virq(int virq) "virq %d"
+# sev.c
+kvm_sev_init(void) ""
diff --git a/accel/stubs/kvm-stub.c b/accel/stubs/kvm-stub.c
index c964af3e1c97..bb78a1f1b950 100644
--- a/accel/stubs/kvm-stub.c
+++ b/accel/stubs/kvm-stub.c
@@ -14,6 +14,7 @@
#include "qemu-common.h"
#include "cpu.h"
#include "sysemu/kvm.h"
+#include "sysemu/sev.h"
#ifndef CONFIG_USER_ONLY
#include "hw/pci/msi.h"
@@ -33,6 +34,11 @@ bool kvm_readonly_mem_allowed;
bool kvm_ioeventfd_any_length_allowed;
bool kvm_msi_use_devid;
+bool sev_allowed;
+uint8_t sev_fw_major;
+uint8_t sev_fw_minor;
+uint8_t sev_fw_build;
+
int kvm_destroy_vcpu(CPUState *cpu)
{
return -ENOSYS;
@@ -105,6 +111,28 @@ int kvm_on_sigbus(int code, void *addr)
return 1;
}
+void sev_get_current_state(char **state)
+{
+}
+
+bool sev_enabled(void)
+{
+ return false;
+}
+
+uint64_t sev_get_me_mask(void)
+{
+ return ~0UL;
+}
+
+void sev_get_fw_version(uint8_t *major, uint8_t *minor, uint8_t *build)
+{
+}
+
+void sev_get_policy(uint32_t *policy)
+{
+}
+
#ifndef CONFIG_USER_ONLY
int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
{
diff --git a/include/sysemu/sev.h b/include/sysemu/sev.h
index eed679653dbc..121e7e4aa44c 100644
--- a/include/sysemu/sev.h
+++ b/include/sysemu/sev.h
@@ -14,6 +14,8 @@
#ifndef QEMU_SEV_H
#define QEMU_SEV_H
+#include <linux/kvm.h>
+
#include "qom/object.h"
#include "qapi/error.h"
#include "sysemu/kvm.h"
@@ -23,6 +25,12 @@
#define QSEV_GUEST_INFO(obj) \
OBJECT_CHECK(QSevGuestInfo, (obj), TYPE_QSEV_GUEST_INFO)
+extern bool sev_enabled(void);
+extern uint64_t sev_get_me_mask(void);
+extern void sev_get_current_state(char **state);
+extern void sev_get_fw_version(uint8_t *major, uint8_t *minor, uint8_t *build);
+extern void sev_get_policy(uint32_t *policy);
+
typedef struct QSevGuestInfo QSevGuestInfo;
typedef struct QSevGuestInfoClass QSevGuestInfoClass;
@@ -50,5 +58,13 @@ struct QSevGuestInfoClass {
ObjectClass parent_class;
};
+struct SEVState {
+ QSevGuestInfo *sev_info;
+};
+
+typedef struct SEVState SEVState;
+
+void *sev_guest_init(const char *id);
+
#endif
--
2.14.3
