[PATCH v2 22/43] KVM: arm64: Handle realm VCPU load

Steven Price
2024-04-12T08:44:10Z

When loading a realm VCPU much of the work is handled by the RMM so only
some of the actions are required. Rearrange kvm_arch_vcpu_load()
slightly so we can bail out early for a realm guest.

Signed-off-by: Steven Price <steven.price@arm.com>
---
arch/arm64/kvm/arm.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index e92afb3835f6..4fd58a1d3351 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -512,10 +512,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)

kvm_vgic_load(vcpu);
kvm_timer_vcpu_load(vcpu);
- if (has_vhe())
- kvm_vcpu_load_vhe(vcpu);
- kvm_arch_vcpu_load_fp(vcpu);
- kvm_vcpu_pmu_restore_guest(vcpu);
if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);

@@ -524,6 +520,15 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
else
vcpu_set_wfx_traps(vcpu);

+ /* No additional state needs to be loaded on Realmed VMs */
+ if (vcpu_is_rec(vcpu))
+ return;
+
+ if (has_vhe())
+ kvm_vcpu_load_vhe(vcpu);
+ kvm_arch_vcpu_load_fp(vcpu);
+ kvm_vcpu_pmu_restore_guest(vcpu);
+
if (vcpu_has_ptrauth(vcpu))
vcpu_ptrauth_disable(vcpu);
kvm_arch_vcpu_load_debug_state_flags(vcpu);
--
2.34.1