This supports EVENT_SIGNAL hypercall. It's used to inject the
software signaled event, whose number is zero. The KVM_REQ_SDEI
request is raised if the PE is unmasked and the event has been
enabled.
Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
---
arch/arm64/kvm/sdei.c | 28 ++++++++++++++++++++++++++++
include/uapi/linux/arm_sdei.h | 3 +++
2 files changed, 31 insertions(+)
diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index 0bea1b2f9452..a55797fce06a 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -232,6 +232,31 @@ static unsigned long pe_mask(struct kvm_vcpu *vcpu, bool mask)
return SDEI_SUCCESS;
}
+static unsigned long event_signal(struct kvm_vcpu *vcpu)
+{
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ unsigned int num = smccc_get_arg(vcpu, 1);
+
+ if (num >= KVM_NR_SDEI_EVENTS)
+ return SDEI_INVALID_PARAMETERS;
+
+ /*
+ * The event must be software signaled event, whose
+ * number is zero.
+ */
+ if (num != SDEI_SW_SIGNALED_EVENT ||
+ !test_bit(num, &vsdei->registered))
+ return SDEI_INVALID_PARAMETERS;
+
+ if (!test_and_set_bit(num, &vsdei->pending)) {
+ if (!(vcpu->arch.flags & KVM_ARM64_SDEI_MASKED) &&
+ test_bit(num, &vsdei->enabled))
+ kvm_make_request(KVM_REQ_SDEI, vcpu);
+ }
+
+ return SDEI_SUCCESS;
+}
+
static unsigned long event_reset(struct kvm_vcpu *vcpu, bool private)
{
struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
@@ -303,6 +328,9 @@ int kvm_sdei_call(struct kvm_vcpu *vcpu)
case SDEI_1_0_FN_SDEI_PE_UNMASK:
ret = pe_mask(vcpu, false);
break;
+ case SDEI_1_1_FN_SDEI_EVENT_SIGNAL:
+ ret = event_signal(vcpu);
+ break;
case SDEI_1_0_FN_SDEI_PRIVATE_RESET:
ret = event_reset(vcpu, true);
break;
diff --git a/include/uapi/linux/arm_sdei.h b/include/uapi/linux/arm_sdei.h
index af0630ba5437..72b07114bbfa 100644
--- a/include/uapi/linux/arm_sdei.h
+++ b/include/uapi/linux/arm_sdei.h
@@ -22,9 +22,12 @@
#define SDEI_1_0_FN_SDEI_PE_UNMASK SDEI_1_0_FN(0x0C)
#define SDEI_1_0_FN_SDEI_INTERRUPT_BIND SDEI_1_0_FN(0x0D)
#define SDEI_1_0_FN_SDEI_INTERRUPT_RELEASE SDEI_1_0_FN(0x0E)
+#define SDEI_1_1_FN_SDEI_EVENT_SIGNAL SDEI_1_0_FN(0x0F)
#define SDEI_1_0_FN_SDEI_PRIVATE_RESET SDEI_1_0_FN(0x11)
#define SDEI_1_0_FN_SDEI_SHARED_RESET SDEI_1_0_FN(0x12)
+#define SDEI_SW_SIGNALED_EVENT 0
+
#define SDEI_VERSION_MAJOR_SHIFT 48
#define SDEI_VERSION_MAJOR_MASK 0x7fff
#define SDEI_VERSION_MINOR_SHIFT 32
--
2.23.0
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