From b7326c19d0504bb913c80075648a71c9830cda10 Mon Sep 17 00:00:00 2001 From: Brijesh Singh Date: Thu, 15 Feb 2018 09:03:22 -0600 Subject: [PATCH] sev/i386: add command to encrypt guest memory region The KVM_SEV_LAUNCH_UPDATE_DATA command is used to encrypt a guest memory region using the VM Encryption Key created using LAUNCH_START. Cc: Paolo Bonzini Cc: Richard Henderson Cc: Eduardo Habkost Signed-off-by: Brijesh Singh [BR: FATE#322124] Signed-off-by: Bruce Rogers --- accel/kvm/kvm-all.c | 2 ++ include/sysemu/sev.h | 1 + stubs/sev.c | 5 +++++ target/i386/sev.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++ target/i386/trace-events | 1 + 5 files changed, 58 insertions(+) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index f1fb826f06..37f7c442dc 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -1675,6 +1675,8 @@ static int kvm_init(MachineState *ms) if (!kvm_state->memcrypt_handle) { goto err; } + + kvm_state->memcrypt_encrypt_data = sev_encrypt_data; } ret = kvm_arch_init(ms, s); diff --git a/include/sysemu/sev.h b/include/sysemu/sev.h index 5c8c549b68..c16102b05e 100644 --- a/include/sysemu/sev.h +++ b/include/sysemu/sev.h @@ -69,5 +69,6 @@ struct SEVState { typedef struct SEVState SEVState; void *sev_guest_init(const char *id); +int sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len); #endif diff --git a/stubs/sev.c b/stubs/sev.c index 24c7b0c3e0..74182bb545 100644 --- a/stubs/sev.c +++ b/stubs/sev.c @@ -15,6 +15,11 @@ #include "qemu-common.h" #include "sysemu/sev.h" +int sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len) +{ + return 1; +} + SevState sev_get_current_state(void) { return SEV_STATE_UNINIT; diff --git a/target/i386/sev.c b/target/i386/sev.c index 6f767084fd..04a64b5bc6 100644 --- a/target/i386/sev.c +++ b/target/i386/sev.c @@ -90,6 +90,12 @@ fw_error_to_str(int code) return sev_fw_errlist[code]; } +static bool +sev_check_state(SevState state) +{ + return current_sev_guest_state == state ? true : false; +} + static void sev_set_guest_state(SevState new_state) { @@ -466,6 +472,36 @@ sev_launch_start(SEVState *s) return 0; } +static int +sev_launch_update_data(uint8_t *addr, uint64_t len) +{ + int ret, fw_error; + struct kvm_sev_launch_update_data *update; + + if (addr == NULL || len <= 0) { + return 1; + } + + update = g_malloc0(sizeof(*update)); + if (!update) { + return 1; + } + + update->uaddr = (__u64)addr; + update->len = len; + trace_kvm_sev_launch_update_data(addr, len); + ret = sev_ioctl(KVM_SEV_LAUNCH_UPDATE_DATA, update, &fw_error); + if (ret) { + error_report("%s: LAUNCH_UPDATE ret=%d fw_error=%d '%s'", + __func__, ret, fw_error, fw_error_to_str(fw_error)); + goto err; + } + +err: + g_free(update); + return ret; +} + void * sev_guest_init(const char *id) { @@ -540,6 +576,19 @@ err: return NULL; } +int +sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len) +{ + assert(handle); + + /* if SEV is in update state then encrypt the data else do nothing */ + if (sev_check_state(SEV_STATE_LUPDATE)) { + return sev_launch_update_data(ptr, len); + } + + return 0; +} + static void sev_register_types(void) { diff --git a/target/i386/trace-events b/target/i386/trace-events index 9402251e99..c0cd8e9321 100644 --- a/target/i386/trace-events +++ b/target/i386/trace-events @@ -12,3 +12,4 @@ kvm_memcrypt_register_region(void *addr, size_t len) "addr %p len 0x%lu" 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