* Tom Lendacky (thomas.lendacky@xxxxxxx) wrote:
> From: Tom Lendacky <thomas.lendacky@xxxxxxx>
>
> 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.
>
> Co-developed-by: Jiri Slaby <jslaby@xxxxxxx>
> Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
> ---
> target/i386/cpu.c | 1 +
> target/i386/sev-stub.c | 5 +++++
> target/i386/sev.c | 46 ++++++++++++++++++++++++++++++++++++++++--
> target/i386/sev_i386.h | 1 +
> 4 files changed, 51 insertions(+), 2 deletions(-)
>
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index 588f32e136..bbbe581d35 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -5969,6 +5969,7 @@ 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;
If that also came from a nicely defined constant it would be great.
Other than that;
Reviewed-by: Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx>
> *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 88e3f39a1e..040ac90563 100644
> --- a/target/i386/sev-stub.c
> +++ b/target/i386/sev-stub.c
> @@ -49,3 +49,8 @@ SevCapability *sev_get_capabilities(Error **errp)
> error_setg(errp, "SEV is not available in this QEMU");
> return NULL;
> }
> +
> +bool sev_es_enabled(void)
> +{
> + return false;
> +}
> diff --git a/target/i386/sev.c b/target/i386/sev.c
> index c3ecf86704..6c9cd0854b 100644
> --- a/target/i386/sev.c
> +++ b/target/i386/sev.c
> @@ -359,6 +359,12 @@ sev_enabled(void)
> return !!sev_guest;
> }
>
> +bool
> +sev_es_enabled(void)
> +{
> + return false;
> +}
> +
> uint64_t
> sev_get_me_mask(void)
> {
> @@ -578,6 +584,22 @@ 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));
> + goto err;
> + }
> +
> +err:
> + return ret;
> +}
> +
> static void
> sev_launch_get_measure(Notifier *notifier, void *unused)
> {
> @@ -590,6 +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 */
> @@ -684,7 +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 = {};
> @@ -745,8 +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);
> --
> 2.28.0
>
--
Dr. David Alan Gilbert / dgilbert@xxxxxxxxxx / Manchester, UK
