[PATCH v4 43/43] KVM: arm64: Allow activating realms
From: Steven Price <steven.price@arm.com>
Date: 2024-08-21 15:41:44
Also in:
kvm, kvmarm, linux-coco, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Add the ioctl to activate a realm and set the static branch to enable access to the realm functionality if the RMM is detected. Signed-off-by: Steven Price <steven.price@arm.com> --- arch/arm64/kvm/rme.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c
index 9f415411d3b5..1eeef9e15d1c 100644
--- a/arch/arm64/kvm/rme.c
+++ b/arch/arm64/kvm/rme.c@@ -1194,6 +1194,20 @@ static int kvm_init_ipa_range_realm(struct kvm *kvm, return realm_init_ipa_state(realm, addr, end); } +static int kvm_activate_realm(struct kvm *kvm) +{ + struct realm *realm = &kvm->arch.realm; + + if (kvm_realm_state(kvm) != REALM_STATE_NEW) + return -EINVAL; + + if (rmi_realm_activate(virt_to_phys(realm->rd))) + return -ENXIO; + + WRITE_ONCE(realm->state, REALM_STATE_ACTIVE); + return 0; +} + /* Protects access to rme_vmid_bitmap */ static DEFINE_SPINLOCK(rme_vmid_lock); static unsigned long *rme_vmid_bitmap;
@@ -1343,6 +1357,9 @@ int kvm_realm_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) r = kvm_populate_realm(kvm, &args); break; } + case KVM_CAP_ARM_RME_ACTIVATE_REALM: + r = kvm_activate_realm(kvm); + break; default: r = -EINVAL; break;
@@ -1599,5 +1616,5 @@ void kvm_init_rme(void) if (rme_vmid_init()) return; - /* Future patch will enable static branch kvm_rme_is_available */ + static_branch_enable(&kvm_rme_is_available); }
--
2.34.1