[PATCH v4 28/38] KVM: arm64: Add hvc handler at EL2 for hypercalls from protected VMs

[Will Deacon <will@kernel.org>]

Add a hypercall handler at EL2 for hypercalls originating from protected
VMs. For now, this implements only the FEATURES and MEMINFO calls, but
subsequent patches will implement the SHARE and UNSHARE functions
necessary for virtio.

Unhandled hypercalls (including PSCI) are passed back to the host.

Reviewed-by: Vincent Donnefort <vdonnefort@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Tested-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
---
 arch/arm64/kvm/hyp/include/nvhe/pkvm.h |  1 +
 arch/arm64/kvm/hyp/nvhe/pkvm.c         | 37 ++++++++++++++++++++++++++
 arch/arm64/kvm/hyp/nvhe/switch.c       |  1 +
 3 files changed, 39 insertions(+)

diff --git a/arch/arm64/kvm/hyp/include/nvhe/pkvm.h b/arch/arm64/kvm/hyp/include/nvhe/pkvm.h
index a5a7bb453f3e..c904647d2f76 100644
--- a/arch/arm64/kvm/hyp/include/nvhe/pkvm.h
+++ b/arch/arm64/kvm/hyp/include/nvhe/pkvm.h
@@ -88,6 +88,7 @@ struct pkvm_hyp_vm *get_pkvm_hyp_vm(pkvm_handle_t handle);
 struct pkvm_hyp_vm *get_np_pkvm_hyp_vm(pkvm_handle_t handle);
 void put_pkvm_hyp_vm(struct pkvm_hyp_vm *hyp_vm);
 
+bool kvm_handle_pvm_hvc64(struct kvm_vcpu *vcpu, u64 *exit_code);
 bool kvm_handle_pvm_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code);
 bool kvm_handle_pvm_restricted(struct kvm_vcpu *vcpu, u64 *exit_code);
 void kvm_init_pvm_id_regs(struct kvm_vcpu *vcpu);
diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c
index 5269ac20d2fb..8b32bf37acc3 100644
--- a/arch/arm64/kvm/hyp/nvhe/pkvm.c
+++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c
@@ -4,6 +4,8 @@
  * Author: Fuad Tabba <tabba@google.com>
  */
 
+#include <kvm/arm_hypercalls.h>
+
 #include <linux/kvm_host.h>
 #include <linux/mm.h>
 
@@ -965,3 +967,38 @@ int __pkvm_finalize_teardown_vm(pkvm_handle_t handle)
 	hyp_spin_unlock(&vm_table_lock);
 	return err;
 }
+/*
+ * Handler for protected VM HVC calls.
+ *
+ * Returns true if the hypervisor has handled the exit (and control
+ * should return to the guest) or false if it hasn't (and the handling
+ * should be performed by the host).
+ */
+bool kvm_handle_pvm_hvc64(struct kvm_vcpu *vcpu, u64 *exit_code)
+{
+	u64 val[4] = { SMCCC_RET_INVALID_PARAMETER };
+	bool handled = true;
+
+	switch (smccc_get_function(vcpu)) {
+	case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
+		val[0] = BIT(ARM_SMCCC_KVM_FUNC_FEATURES);
+		val[0] |= BIT(ARM_SMCCC_KVM_FUNC_HYP_MEMINFO);
+		break;
+	case ARM_SMCCC_VENDOR_HYP_KVM_HYP_MEMINFO_FUNC_ID:
+		if (smccc_get_arg1(vcpu) ||
+		    smccc_get_arg2(vcpu) ||
+		    smccc_get_arg3(vcpu)) {
+			break;
+		}
+
+		val[0] = PAGE_SIZE;
+		break;
+	default:
+		/* Punt everything else back to the host, for now. */
+		handled = false;
+	}
+
+	if (handled)
+		smccc_set_retval(vcpu, val[0], val[1], val[2], val[3]);
+	return handled;
+}
diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c
index 779089e42681..51bd88dc6012 100644
--- a/arch/arm64/kvm/hyp/nvhe/switch.c
+++ b/arch/arm64/kvm/hyp/nvhe/switch.c
@@ -190,6 +190,7 @@ static const exit_handler_fn hyp_exit_handlers[] = {
 
 static const exit_handler_fn pvm_exit_handlers[] = {
 	[0 ... ESR_ELx_EC_MAX]		= NULL,
+	[ESR_ELx_EC_HVC64]		= kvm_handle_pvm_hvc64,
 	[ESR_ELx_EC_SYS64]		= kvm_handle_pvm_sys64,
 	[ESR_ELx_EC_SVE]		= kvm_handle_pvm_restricted,
 	[ESR_ELx_EC_FP_ASIMD]		= kvm_hyp_handle_fpsimd,
-- 
2.53.0.1018.g2bb0e51243-goog