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From: Gavin Shan <gshan@redhat.com>
To: kvmarm@lists.cs.columbia.edu
Cc: maz@kernel.org, shan.gavin@gmail.com, pbonzini@redhat.com,
	will@kernel.org
Subject: [PATCH 2/6] arm/arm64: KVM: Advertise KVM UID to guests via SMCCC
Date: Tue, 18 Aug 2020 11:13:15 +1000	[thread overview]
Message-ID: <20200818011319.91777-3-gshan@redhat.com> (raw)
In-Reply-To: <20200818011319.91777-1-gshan@redhat.com>

From: Will Deacon <will@kernel.org>

We can advertise ourselves to guests as KVM and provide a basic features
bitmap for discoverability of future hypervisor services.

Cc: Marc Zyngier <maz@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Gavin Shan <gshan@redhat.com>
---
 arch/arm64/kvm/hypercalls.c | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/kvm/hypercalls.c b/arch/arm64/kvm/hypercalls.c
index 1268465efa64..cd48fd724a52 100644
--- a/arch/arm64/kvm/hypercalls.c
+++ b/arch/arm64/kvm/hypercalls.c
@@ -13,13 +13,13 @@
 int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
 {
 	u32 func_id = smccc_get_function(vcpu);
-	long val = SMCCC_RET_NOT_SUPPORTED;
+	long val[4] = { SMCCC_RET_NOT_SUPPORTED };
 	u32 feature;
 	gpa_t gpa;
 
 	switch (func_id) {
 	case ARM_SMCCC_VERSION_FUNC_ID:
-		val = ARM_SMCCC_VERSION_1_1;
+		val[0] = ARM_SMCCC_VERSION_1_1;
 		break;
 	case ARM_SMCCC_ARCH_FEATURES_FUNC_ID:
 		feature = smccc_get_arg1(vcpu);
@@ -29,10 +29,10 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
 			case KVM_BP_HARDEN_UNKNOWN:
 				break;
 			case KVM_BP_HARDEN_WA_NEEDED:
-				val = SMCCC_RET_SUCCESS;
+				val[0] = SMCCC_RET_SUCCESS;
 				break;
 			case KVM_BP_HARDEN_NOT_REQUIRED:
-				val = SMCCC_RET_NOT_REQUIRED;
+				val[0] = SMCCC_RET_NOT_REQUIRED;
 				break;
 			}
 			break;
@@ -42,26 +42,35 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
 			case KVM_SSBD_UNKNOWN:
 				break;
 			case KVM_SSBD_KERNEL:
-				val = SMCCC_RET_SUCCESS;
+				val[0] = SMCCC_RET_SUCCESS;
 				break;
 			case KVM_SSBD_FORCE_ENABLE:
 			case KVM_SSBD_MITIGATED:
-				val = SMCCC_RET_NOT_REQUIRED;
+				val[0] = SMCCC_RET_NOT_REQUIRED;
 				break;
 			}
 			break;
 		case ARM_SMCCC_HV_PV_TIME_FEATURES:
-			val = SMCCC_RET_SUCCESS;
+			val[0] = SMCCC_RET_SUCCESS;
 			break;
 		}
 		break;
 	case ARM_SMCCC_HV_PV_TIME_FEATURES:
-		val = kvm_hypercall_pv_features(vcpu);
+		val[0] = kvm_hypercall_pv_features(vcpu);
 		break;
 	case ARM_SMCCC_HV_PV_TIME_ST:
 		gpa = kvm_init_stolen_time(vcpu);
 		if (gpa != GPA_INVALID)
-			val = gpa;
+			val[0] = gpa;
+		break;
+	case ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID:
+		val[0] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0;
+		val[1] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1;
+		val[2] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2;
+		val[3] = ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3;
+		break;
+	case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
+		val[0] = BIT(ARM_SMCCC_KVM_FUNC_FEATURES);
 		break;
 	case SDEI_1_0_FN_SDEI_VERSION:
 	case SDEI_1_0_FN_SDEI_EVENT_REGISTER:
@@ -85,6 +94,6 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
 		return kvm_psci_call(vcpu);
 	}
 
-	smccc_set_retval(vcpu, val, 0, 0, 0);
+	smccc_set_retval(vcpu, val[0], val[1], val[2], val[3]);
 	return 1;
 }
-- 
2.23.0

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  parent reply	other threads:[~2020-08-18  1:13 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-18  1:13 [PATCH 0/6] Support Asynchronous Page Fault Gavin Shan
2020-08-18  1:13 ` [PATCH 1/6] arm64: Probe for the presence of KVM hypervisor services during boot Gavin Shan
2020-08-18  1:13 ` Gavin Shan [this message]
2020-08-18  1:13 ` [PATCH 3/6] kvm/arm64: Export kvm_handle_user_mem_abort() with prefault mode Gavin Shan
2020-10-23 16:54   ` James Morse
2020-11-02  5:30     ` Gavin Shan
2020-08-18  1:13 ` [PATCH 4/6] arm64/kvm: Support async page fault Gavin Shan
2020-10-23 17:01   ` James Morse
2020-11-02  7:19     ` Gavin Shan
2020-08-18  1:13 ` [PATCH 5/6] drivers/acpi: Import ACPI APF table Gavin Shan
2020-10-23 16:55   ` James Morse
2020-08-18  1:13 ` [PATCH 6/6] arm64/kernel: Support async page fault Gavin Shan
2020-10-23 16:54 ` [PATCH 0/6] Support Asynchronous Page Fault James Morse
2020-10-31 14:18   ` Paolo Bonzini
2020-11-02  5:23   ` Gavin Shan

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