diff options
Diffstat (limited to 'target/i386/sev.c')
| -rw-r--r-- | target/i386/sev.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/target/i386/sev.c b/target/i386/sev.c index ab42e4a456..feb3289c03 100644 --- a/target/i386/sev.c +++ b/target/i386/sev.c @@ -11,6 +11,11 @@ * */ +#include <linux/kvm.h> +#include <linux/psp-sev.h> + +#include <sys/ioctl.h> + #include "qemu/osdep.h" #include "qapi/error.h" #include "qom/object_interfaces.h" @@ -18,10 +23,88 @@ #include "sysemu/kvm.h" #include "sev_i386.h" #include "sysemu/sysemu.h" +#include "trace.h" #define DEFAULT_GUEST_POLICY 0x1 /* disable debug */ #define DEFAULT_SEV_DEVICE "/dev/sev" +static SEVState *sev_state; + +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" +}; + +#define SEV_FW_MAX_ERROR ARRAY_SIZE(sev_fw_errlist) + +static int +sev_ioctl(int fd, int cmd, void *data, int *error) +{ + int r; + struct kvm_sev_cmd input; + + memset(&input, 0x0, sizeof(input)); + + input.id = cmd; + input.sev_fd = fd; + input.data = (__u64)(unsigned long)data; + + r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, &input); + + if (error) { + *error = input.error; + } + + return r; +} + +static int +sev_platform_ioctl(int fd, int cmd, void *data, int *error) +{ + int r; + struct sev_issue_cmd arg; + + arg.cmd = cmd; + arg.data = (unsigned long)data; + r = ioctl(fd, SEV_ISSUE_CMD, &arg); + if (error) { + *error = arg.error; + } + + return r; +} + +static const char * +fw_error_to_str(int code) +{ + if (code < 0 || code >= SEV_FW_MAX_ERROR) { + return "unknown error"; + } + + return sev_fw_errlist[code]; +} + static void qsev_guest_finalize(Object *obj) { @@ -219,6 +302,147 @@ 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; +} + +bool +sev_enabled(void) +{ + return sev_state ? true : false; +} + +uint64_t +sev_get_me_mask(void) +{ + return sev_state ? sev_state->me_mask : ~0; +} + +uint32_t +sev_get_cbit_position(void) +{ + return sev_state ? sev_state->cbitpos : 0; +} + +uint32_t +sev_get_reduced_phys_bits(void) +{ + return sev_state ? sev_state->reduced_phys_bits : 0; +} + +SevInfo * +sev_get_info(void) +{ + SevInfo *info; + + info = g_new0(SevInfo, 1); + info->enabled = sev_state ? true : false; + + if (info->enabled) { + info->api_major = sev_state->api_major; + info->api_minor = sev_state->api_minor; + info->build_id = sev_state->build_id; + info->policy = sev_state->policy; + info->state = sev_state->state; + info->handle = sev_state->handle; + } + + return info; +} + +void * +sev_guest_init(const char *id) +{ + SEVState *s; + char *devname; + int ret, fw_error; + uint32_t ebx; + uint32_t host_cbitpos; + struct sev_user_data_status status = {}; + + 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; + } + + sev_state = s; + s->state = SEV_STATE_UNINIT; + + host_cpuid(0x8000001F, 0, NULL, &ebx, NULL, NULL); + host_cbitpos = ebx & 0x3f; + + s->cbitpos = object_property_get_int(OBJECT(s->sev_info), "cbitpos", NULL); + if (host_cbitpos != s->cbitpos) { + error_report("%s: cbitpos check failed, host '%d' requested '%d'", + __func__, host_cbitpos, s->cbitpos); + goto err; + } + + s->reduced_phys_bits = object_property_get_int(OBJECT(s->sev_info), + "reduced-phys-bits", NULL); + if (s->reduced_phys_bits < 1) { + error_report("%s: reduced_phys_bits check failed, it should be >=1," + "' requested '%d'", __func__, s->reduced_phys_bits); + goto err; + } + + s->me_mask = ~(1UL << s->cbitpos); + + devname = object_property_get_str(OBJECT(s->sev_info), "sev-device", NULL); + s->sev_fd = open(devname, O_RDWR); + if (s->sev_fd < 0) { + error_report("%s: Failed to open %s '%s'", __func__, + devname, strerror(errno)); + goto err; + } + g_free(devname); + + ret = sev_platform_ioctl(s->sev_fd, SEV_PLATFORM_STATUS, &status, + &fw_error); + if (ret) { + error_report("%s: failed to get platform status ret=%d" + "fw_error='%d: %s'", __func__, ret, fw_error, + fw_error_to_str(fw_error)); + goto err; + } + s->build_id = status.build; + s->api_major = status.api_major; + s->api_minor = status.api_minor; + + trace_kvm_sev_init(); + ret = sev_ioctl(s->sev_fd, 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; + } + + return s; +err: + g_free(sev_state); + sev_state = NULL; + return NULL; +} + static void sev_register_types(void) { |