ARM/ARM64: KVM: Add base for PSCI v0.2 emulation

Currently, the in-kernel PSCI emulation provides PSCI v0.1 interface to
VCPUs. This patch extends current in-kernel PSCI emulation to provide
PSCI v0.2 interface to VCPUs.

By default, ARM/ARM64 KVM will always provide PSCI v0.1 interface for
keeping the ABI backward-compatible.

To select PSCI v0.2 interface for VCPUs, the user space (i.e. QEMU or
KVMTOOL) will have to set KVM_ARM_VCPU_PSCI_0_2 feature when doing VCPU
init using KVM_ARM_VCPU_INIT ioctl.

Signed-off-by: Anup Patel <anup.patel@linaro.org>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

1 files changed, 77 insertions, 16 deletions

diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
index 448f60e8d23c..8c42596cdbdf 100644
--- a/arch/arm/kvm/psci.c
+++ b/arch/arm/kvm/psci.c
@@ -59,7 +59,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
          * turned off.
          */
         if (!vcpu || !vcpu->arch.pause)
-                return KVM_PSCI_RET_INVAL;
+                return PSCI_RET_INVALID_PARAMS;
 
         target_pc = *vcpu_reg(source_vcpu, 2);
 
@@ -82,20 +82,60 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
         wq = kvm_arch_vcpu_wq(vcpu);
         wake_up_interruptible(wq);
 
-        return KVM_PSCI_RET_SUCCESS;
+        return PSCI_RET_SUCCESS;
 }
 
-/**
- * kvm_psci_call - handle PSCI call if r0 value is in range
- * @vcpu: Pointer to the VCPU struct
- *
- * Handle PSCI calls from guests through traps from HVC instructions.
- * The calling convention is similar to SMC calls to the secure world where
- * the function number is placed in r0 and this function returns true if the
- * function number specified in r0 is withing the PSCI range, and false
- * otherwise.
- */
-bool kvm_psci_call(struct kvm_vcpu *vcpu)
+int kvm_psci_version(struct kvm_vcpu *vcpu)
+{
+        if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features))
+                return KVM_ARM_PSCI_0_2;
+
+        return KVM_ARM_PSCI_0_1;
+}
+
+static bool kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
+{
+        unsigned long psci_fn = *vcpu_reg(vcpu, 0) & ~((u32) 0);
+        unsigned long val;
+
+        switch (psci_fn) {
+        case PSCI_0_2_FN_PSCI_VERSION:
+                /*
+                 * Bits[31:16] = Major Version = 0
+                 * Bits[15:0] = Minor Version = 2
+                 */
+                val = 2;
+                break;
+        case PSCI_0_2_FN_CPU_OFF:
+                kvm_psci_vcpu_off(vcpu);
+                val = PSCI_RET_SUCCESS;
+                break;
+        case PSCI_0_2_FN_CPU_ON:
+        case PSCI_0_2_FN64_CPU_ON:
+                val = kvm_psci_vcpu_on(vcpu);
+                break;
+        case PSCI_0_2_FN_CPU_SUSPEND:
+        case PSCI_0_2_FN_AFFINITY_INFO:
+        case PSCI_0_2_FN_MIGRATE:
+        case PSCI_0_2_FN_MIGRATE_INFO_TYPE:
+        case PSCI_0_2_FN_MIGRATE_INFO_UP_CPU:
+        case PSCI_0_2_FN_SYSTEM_OFF:
+        case PSCI_0_2_FN_SYSTEM_RESET:
+        case PSCI_0_2_FN64_CPU_SUSPEND:
+        case PSCI_0_2_FN64_AFFINITY_INFO:
+        case PSCI_0_2_FN64_MIGRATE:
+        case PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU:
+                val = PSCI_RET_NOT_SUPPORTED;
+                break;
+        default:
+                return false;
+        }
+
+        *vcpu_reg(vcpu, 0) = val;
+        return true;
+}
+
+static bool kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
 {
         unsigned long psci_fn = *vcpu_reg(vcpu, 0) & ~((u32) 0);
         unsigned long val;
@@ -103,16 +143,15 @@ bool kvm_psci_call(struct kvm_vcpu *vcpu)
         switch (psci_fn) {
         case KVM_PSCI_FN_CPU_OFF:
                 kvm_psci_vcpu_off(vcpu);
-                val = KVM_PSCI_RET_SUCCESS;
+                val = PSCI_RET_SUCCESS;
                 break;
         case KVM_PSCI_FN_CPU_ON:
                 val = kvm_psci_vcpu_on(vcpu);
                 break;
         case KVM_PSCI_FN_CPU_SUSPEND:
         case KVM_PSCI_FN_MIGRATE:
-                val = KVM_PSCI_RET_NI;
+                val = PSCI_RET_NOT_SUPPORTED;
                 break;
-
         default:
                 return false;
         }
@@ -120,3 +159,25 @@ bool kvm_psci_call(struct kvm_vcpu *vcpu)
         *vcpu_reg(vcpu, 0) = val;
         return true;
 }
+
+/**
+ * kvm_psci_call - handle PSCI call if r0 value is in range
+ * @vcpu: Pointer to the VCPU struct
+ *
+ * Handle PSCI calls from guests through traps from HVC instructions.
+ * The calling convention is similar to SMC calls to the secure world where
+ * the function number is placed in r0 and this function returns true if the
+ * function number specified in r0 is withing the PSCI range, and false
+ * otherwise.
+ */
+bool kvm_psci_call(struct kvm_vcpu *vcpu)
+{
+        switch (kvm_psci_version(vcpu)) {
+        case KVM_ARM_PSCI_0_2:
+                return kvm_psci_0_2_call(vcpu);
+        case KVM_ARM_PSCI_0_1:
+                return kvm_psci_0_1_call(vcpu);
+        default:
+                return false;
+        };
+}