[PATCH v4 11/21] KVM: arm64: Support SDEI_PE_{MASK, UNMASK} hypercall
From: Gavin Shan <hidden>
Date: 2021-08-15 00:15:41
Also in:
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
This supports SDEI_PE_{MASK, UNMASK} hypercall. They are used by
the guest to stop the specific vCPU from receiving SDEI events.
Signed-off-by: Gavin Shan <redacted>
---
arch/arm64/kvm/sdei.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index 458695c2394f..3fb33258b494 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c@@ -551,6 +551,37 @@ static unsigned long kvm_sdei_hypercall_route(struct kvm_vcpu *vcpu) return ret; } +static unsigned long kvm_sdei_hypercall_mask(struct kvm_vcpu *vcpu, + bool mask) +{ + struct kvm *kvm = vcpu->kvm; + struct kvm_sdei_kvm *ksdei = kvm->arch.sdei; + struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei; + unsigned long ret = SDEI_SUCCESS; + + /* Sanity check */ + if (!(ksdei && vsdei)) { + ret = SDEI_NOT_SUPPORTED; + goto out; + } + + spin_lock(&vsdei->lock); + + /* Check the state */ + if (mask == vsdei->state.masked) { + ret = SDEI_DENIED; + goto unlock; + } + + /* Update the state */ + vsdei->state.masked = mask ? 1 : 0; + +unlock: + spin_unlock(&vsdei->lock); +out: + return ret; +} + int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) { u32 func = smccc_get_function(vcpu);
@@ -588,7 +619,11 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) ret = kvm_sdei_hypercall_route(vcpu); break; case SDEI_1_0_FN_SDEI_PE_MASK: + ret = kvm_sdei_hypercall_mask(vcpu, true); + break; case SDEI_1_0_FN_SDEI_PE_UNMASK: + ret = kvm_sdei_hypercall_mask(vcpu, false); + break; case SDEI_1_0_FN_SDEI_INTERRUPT_BIND: case SDEI_1_0_FN_SDEI_INTERRUPT_RELEASE: case SDEI_1_0_FN_SDEI_PRIVATE_RESET:
--
2.23.0
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