From 6b98e96f1842a54c0bf074f4dad0928808afe287 Mon Sep 17 00:00:00 2001 From: Tom Lendacky Date: Tue, 26 Jan 2021 11:36:44 -0600 Subject: sev/i386: Add initial support for SEV-ES Provide initial support for SEV-ES. This includes creating a function to indicate the guest is an SEV-ES guest (which will return false until all support is in place), performing the proper SEV initialization and ensuring that the guest CPU state is measured as part of the launch. Cc: Paolo Bonzini Cc: Richard Henderson Cc: Eduardo Habkost Reviewed-by: Dr. David Alan Gilbert Co-developed-by: Jiri Slaby Signed-off-by: Jiri Slaby Signed-off-by: Tom Lendacky Reviewed-by: Venu Busireddy Message-Id: <2e6386cbc1ddeaf701547dd5677adf5ddab2b6bd.1611682609.git.thomas.lendacky@amd.com> Signed-off-by: Paolo Bonzini --- target/i386/cpu.c | 1 + target/i386/sev-stub.c | 6 ++++++ target/i386/sev.c | 44 ++++++++++++++++++++++++++++++++++++++++++-- target/i386/sev_i386.h | 1 + 4 files changed, 50 insertions(+), 2 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 9c3d2d60b7..20c3a5af3f 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -5984,6 +5984,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, break; case 0x8000001F: *eax = sev_enabled() ? 0x2 : 0; + *eax |= sev_es_enabled() ? 0x8 : 0; *ebx = sev_get_cbit_position(); *ebx |= sev_get_reduced_phys_bits() << 6; *ecx = 0; diff --git a/target/i386/sev-stub.c b/target/i386/sev-stub.c index 1ac1fd5b94..edf6c519d7 100644 --- a/target/i386/sev-stub.c +++ b/target/i386/sev-stub.c @@ -49,6 +49,7 @@ SevCapability *sev_get_capabilities(Error **errp) error_setg(errp, "SEV is not available in this QEMU"); return NULL; } + int sev_inject_launch_secret(const char *hdr, const char *secret, uint64_t gpa, Error **errp) { @@ -59,3 +60,8 @@ int sev_encrypt_flash(uint8_t *ptr, uint64_t len, Error **errp) { return 0; } + +bool sev_es_enabled(void) +{ + return false; +} diff --git a/target/i386/sev.c b/target/i386/sev.c index 11c9a3cc21..dc0e53019b 100644 --- a/target/i386/sev.c +++ b/target/i386/sev.c @@ -341,6 +341,12 @@ sev_enabled(void) return !!sev_guest; } +bool +sev_es_enabled(void) +{ + return false; +} + uint64_t sev_get_me_mask(void) { @@ -561,6 +567,20 @@ sev_launch_update_data(SevGuestState *sev, uint8_t *addr, uint64_t len) return ret; } +static int +sev_launch_update_vmsa(SevGuestState *sev) +{ + int ret, fw_error; + + ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_UPDATE_VMSA, NULL, &fw_error); + if (ret) { + error_report("%s: LAUNCH_UPDATE_VMSA ret=%d fw_error=%d '%s'", + __func__, ret, fw_error, fw_error_to_str(fw_error)); + } + + return ret; +} + static void sev_launch_get_measure(Notifier *notifier, void *unused) { @@ -573,6 +593,14 @@ sev_launch_get_measure(Notifier *notifier, void *unused) return; } + if (sev_es_enabled()) { + /* measure all the VM save areas before getting launch_measure */ + ret = sev_launch_update_vmsa(sev); + if (ret) { + exit(1); + } + } + measurement = g_new0(struct kvm_sev_launch_measure, 1); /* query the measurement blob length */ @@ -667,7 +695,7 @@ int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp) SevGuestState *sev = (SevGuestState *)object_dynamic_cast(OBJECT(cgs), TYPE_SEV_GUEST); char *devname; - int ret, fw_error; + int ret, fw_error, cmd; uint32_t ebx; uint32_t host_cbitpos; struct sev_user_data_status status = {}; @@ -724,8 +752,20 @@ int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp) sev->api_major = status.api_major; sev->api_minor = status.api_minor; + if (sev_es_enabled()) { + if (!(status.flags & SEV_STATUS_FLAGS_CONFIG_ES)) { + error_report("%s: guest policy requires SEV-ES, but " + "host SEV-ES support unavailable", + __func__); + goto err; + } + cmd = KVM_SEV_ES_INIT; + } else { + cmd = KVM_SEV_INIT; + } + trace_kvm_sev_init(); - ret = sev_ioctl(sev->sev_fd, KVM_SEV_INIT, NULL, &fw_error); + ret = sev_ioctl(sev->sev_fd, cmd, NULL, &fw_error); if (ret) { error_setg(errp, "%s: failed to initialize ret=%d fw_error=%d '%s'", __func__, ret, fw_error, fw_error_to_str(fw_error)); diff --git a/target/i386/sev_i386.h b/target/i386/sev_i386.h index bd9f00a908..ae221d4c72 100644 --- a/target/i386/sev_i386.h +++ b/target/i386/sev_i386.h @@ -28,6 +28,7 @@ #define SEV_POLICY_DOMAIN 0x10 #define SEV_POLICY_SEV 0x20 +extern bool sev_es_enabled(void); extern uint64_t sev_get_me_mask(void); extern SevInfo *sev_get_info(void); extern uint32_t sev_get_cbit_position(void); -- cgit v1.2.3-55-g7522