The machine code calls kvm_arm_rme_vm_type() to get the VM flag and
kvm_arm_rme_init() to issue KVM hypercalls in the required order:
* create the realm descriptor early,
* finalize the REC (vCPU) after the registers are reset,
* load images into Realm RAM (in another patch),
* activate the realm at the end, at which point the realm is sealed.
Signed-off-by: Jean-Philippe Brucker <jean-phili...@linaro.org>
---
target/arm/kvm_arm.h | 14 ++++++
target/arm/kvm-rme.c | 101 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 115 insertions(+)
diff --git a/target/arm/kvm_arm.h b/target/arm/kvm_arm.h
index 99017b635c..00d3df8cac 100644
--- a/target/arm/kvm_arm.h
+++ b/target/arm/kvm_arm.h
@@ -369,6 +369,11 @@ void kvm_arm_pvtime_init(CPUState *cs, uint64_t ipa);
int kvm_arm_set_irq(int cpu, int irqtype, int irq, int level);
+int kvm_arm_rme_init(ConfidentialGuestSupport *cgs, Error **errp);
+int kvm_arm_rme_vm_type(MachineState *ms);
+
+bool kvm_arm_rme_enabled(void);
+
#else
/*
@@ -443,6 +448,15 @@ static inline uint32_t kvm_arm_sve_get_vls(CPUState *cs)
g_assert_not_reached();
}
+static inline int kvm_arm_rme_init(ConfidentialGuestSupport *cgs, Error **errp)
+{
+ return 0;
+}
+
+static inline int kvm_arm_rme_vm_type(MachineState *ms)
+{
+ return 0;
+}
#endif
static inline const char *gic_class_name(void)
diff --git a/target/arm/kvm-rme.c b/target/arm/kvm-rme.c
index 22aa3dc712..d7cdca1cbf 100644
--- a/target/arm/kvm-rme.c
+++ b/target/arm/kvm-rme.c
@@ -25,6 +25,107 @@ struct RmeGuest {
ConfidentialGuestSupport parent_obj;
};
+static RmeGuest *cgs_to_rme(ConfidentialGuestSupport *cgs)
+{
+ if (!cgs) {
+ return NULL;
+ }
+ return (RmeGuest *)object_dynamic_cast(OBJECT(cgs), TYPE_RME_GUEST);
+}
+
+bool kvm_arm_rme_enabled(void)
+{
+ ConfidentialGuestSupport *cgs = MACHINE(qdev_get_machine())->cgs;
+
+ return !!cgs_to_rme(cgs);
+}
+
+static int rme_create_rd(RmeGuest *guest, Error **errp)
+{
+ int ret = kvm_vm_enable_cap(kvm_state, KVM_CAP_ARM_RME, 0,
+ KVM_CAP_ARM_RME_CREATE_RD);
+
+ if (ret) {
+ error_setg_errno(errp, -ret, "RME: failed to create Realm Descriptor");
+ }
+ return ret;
+}
+
+static void rme_vm_state_change(void *opaque, bool running, RunState state)
+{
+ int ret;
+ CPUState *cs;
+
+ if (state != RUN_STATE_RUNNING) {
+ return;
+ }
+
+ /*
+ * Now that do_cpu_reset() initialized the boot PC and
+ * kvm_cpu_synchronize_post_reset() registered it, we can finalize the REC.
+ */
+ CPU_FOREACH(cs) {
+ ret = kvm_arm_vcpu_finalize(cs, KVM_ARM_VCPU_REC);
+ if (ret) {
+ error_setg_errno(&error_fatal, -ret,
+ "RME: failed to finalize vCPU");
+ }
+ }
+
+ ret = kvm_vm_enable_cap(kvm_state, KVM_CAP_ARM_RME, 0,
+ KVM_CAP_ARM_RME_ACTIVATE_REALM);
+ if (ret) {
+ error_setg_errno(&error_fatal, -ret, "RME: failed to activate realm");
+ }
+}
+
+int kvm_arm_rme_init(ConfidentialGuestSupport *cgs, Error **errp)
+{
+ int ret;
+ static Error *rme_mig_blocker;
+ RmeGuest *guest = cgs_to_rme(cgs);
+
+ if (!guest) {
+ /* Either no cgs, or another confidential guest type */
+ return 0;
+ }
+
+ if (!kvm_enabled()) {
+ error_setg(errp, "KVM required for RME");
+ return -ENODEV;
+ }
+
+ if (!kvm_check_extension(kvm_state, KVM_CAP_ARM_RME)) {
+ error_setg(errp, "KVM does not support RME");
+ return -ENODEV;
+ }
+
+ ret = rme_create_rd(guest, errp);
+ if (ret) {
+ return ret;
+ }
+
+ error_setg(&rme_mig_blocker, "RME: migration is not implemented");
+ migrate_add_blocker(rme_mig_blocker, &error_fatal);
+
+ /*
+ * The realm activation is done last, when the VM starts, after all images
+ * have been loaded and all vcpus finalized.
+ */
+ qemu_add_vm_change_state_handler(rme_vm_state_change, guest);
+
+ cgs->ready = true;
+ return 0;
+}
+
+int kvm_arm_rme_vm_type(MachineState *ms)
+{
+ if (cgs_to_rme(ms->cgs)) {
+ return KVM_VM_TYPE_ARM_REALM;
+ }
+ return 0;
+}
+
static void rme_guest_class_init(ObjectClass *oc, void *data)
{
}
--
2.39.0
