| Message ID | 6403cdc0040bc07355b35fe56e26fb9cd11eb172.1610665956.git.thomas.lendacky@amd.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Qemu SEV-ES guest support | expand |
* Tom Lendacky (thomas.lendacky@amd.com) wrote: > From: Tom Lendacky <thomas.lendacky@amd.com> > > 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 <pbonzini@redhat.com> > Cc: Richard Henderson <richard.henderson@linaro.org> > Cc: Eduardo Habkost <ehabkost@redhat.com> > Co-developed-by: Jiri Slaby <jslaby@suse.cz> > Signed-off-by: Jiri Slaby <jslaby@suse.cz> > Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> > --- > 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 35459a38bb..9adb34c091 100644 > --- a/target/i386/cpu.c > +++ b/target/i386/cpu.c > @@ -5986,6 +5986,7 @@ 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; Yep, matches your docs - it would be great if these magic constants could become enums or #defines somewhere. anyway, Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> > *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 c1fecc2101..229a2ee77b 100644 > --- a/target/i386/sev-stub.c > +++ b/target/i386/sev-stub.c > @@ -49,8 +49,14 @@ 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) > { > return 1; > } > + > +bool sev_es_enabled(void) > +{ > + return false; > +} > diff --git a/target/i386/sev.c b/target/i386/sev.c > index 1546606811..fce2128c07 100644 > --- a/target/i386/sev.c > +++ b/target/i386/sev.c > @@ -360,6 +360,12 @@ sev_enabled(void) > return !!sev_guest; > } > > +bool > +sev_es_enabled(void) > +{ > + return false; > +} > + > uint64_t > sev_get_me_mask(void) > { > @@ -580,6 +586,20 @@ 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) > { > @@ -592,6 +612,14 @@ 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 */ > @@ -686,7 +714,7 @@ sev_guest_init(const char *id) > { > SevGuestState *sev; > char *devname; > - int ret, fw_error; > + int ret, fw_error, cmd; > uint32_t ebx; > uint32_t host_cbitpos; > struct sev_user_data_status status = {}; > @@ -747,8 +775,20 @@ sev_guest_init(const char *id) > 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_report("%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 4db6960f60..4f9a5e9b21 100644 > --- a/target/i386/sev_i386.h > +++ b/target/i386/sev_i386.h > @@ -29,6 +29,7 @@ > #define SEV_POLICY_SEV 0x20 > > extern bool sev_enabled(void); > +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); > -- > 2.30.0 >
diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 35459a38bb..9adb34c091 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -5986,6 +5986,7 @@ 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 c1fecc2101..229a2ee77b 100644 --- a/target/i386/sev-stub.c +++ b/target/i386/sev-stub.c @@ -49,8 +49,14 @@ 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) { return 1; } + +bool sev_es_enabled(void) +{ + return false; +} diff --git a/target/i386/sev.c b/target/i386/sev.c index 1546606811..fce2128c07 100644 --- a/target/i386/sev.c +++ b/target/i386/sev.c @@ -360,6 +360,12 @@ sev_enabled(void) return !!sev_guest; } +bool +sev_es_enabled(void) +{ + return false; +} + uint64_t sev_get_me_mask(void) { @@ -580,6 +586,20 @@ 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) { @@ -592,6 +612,14 @@ 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 */ @@ -686,7 +714,7 @@ sev_guest_init(const char *id) { SevGuestState *sev; char *devname; - int ret, fw_error; + int ret, fw_error, cmd; uint32_t ebx; uint32_t host_cbitpos; struct sev_user_data_status status = {}; @@ -747,8 +775,20 @@ sev_guest_init(const char *id) 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_report("%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 4db6960f60..4f9a5e9b21 100644 --- a/target/i386/sev_i386.h +++ b/target/i386/sev_i386.h @@ -29,6 +29,7 @@ #define SEV_POLICY_SEV 0x20 extern bool sev_enabled(void); +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);