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[v10,09/12] ARM/ARM64: KVM: Emulate PSCI v0.2 MIGRATE_INFO_TYPE and related functions

Message ID 1398085206-30555-10-git-send-email-anup.patel@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Anup Patel April 21, 2014, 1 p.m. UTC 
This patch adds emulation of PSCI v0.2 MIGRATE, MIGRATE_INFO_TYPE, and
MIGRATE_INFO_UP_CPU function calls for KVM ARM/ARM64.

KVM ARM/ARM64 being a hypervisor (and not a Trusted OS), we cannot provide
this functions hence we emulate these functions in following way:
1. MIGRATE - Returns "Not Supported"
2. MIGRATE_INFO_TYPE - Return 2 i.e. Trusted OS is not present
3. MIGRATE_INFO_UP_CPU - Returns "Not Supported"

Signed-off-by: Anup Patel <anup.patel@linaro.org>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm/kvm/psci.c |   21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)
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Patch

diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
index 122bc67..d04a47b 100644
--- a/arch/arm/kvm/psci.c
+++ b/arch/arm/kvm/psci.c
@@ -182,6 +182,22 @@  static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
 	case PSCI_0_2_FN64_AFFINITY_INFO:
 		val = kvm_psci_vcpu_affinity_info(vcpu);
 		break;
+	case PSCI_0_2_FN_MIGRATE:
+	case PSCI_0_2_FN64_MIGRATE:
+		val = PSCI_RET_NOT_SUPPORTED;
+		break;
+	case PSCI_0_2_FN_MIGRATE_INFO_TYPE:
+		/*
+		 * Trusted OS is MP hence does not require migration
+	         * or
+		 * Trusted OS is not present
+		 */
+		val = PSCI_0_2_TOS_MP;
+		break;
+	case PSCI_0_2_FN_MIGRATE_INFO_UP_CPU:
+	case PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU:
+		val = PSCI_RET_NOT_SUPPORTED;
+		break;
 	case PSCI_0_2_FN_SYSTEM_OFF:
 		kvm_psci_system_off(vcpu);
 		val = PSCI_RET_INTERNAL_FAILURE;
@@ -193,12 +209,7 @@  static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
 		ret = 0;
 		break;
 	case PSCI_0_2_FN_CPU_SUSPEND:
-	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_FN64_CPU_SUSPEND:
-	case PSCI_0_2_FN64_MIGRATE:
-	case PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU:
 		val = PSCI_RET_NOT_SUPPORTED;
 		break;
 	default: