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-rw-r--r--arch/arm/kvm/psci.c332
1 files changed, 0 insertions, 332 deletions
diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
deleted file mode 100644
index a08d7a93aebb..000000000000
--- a/arch/arm/kvm/psci.c
+++ /dev/null
@@ -1,332 +0,0 @@
-/*
- * Copyright (C) 2012 - ARM Ltd
- * Author: Marc Zyngier <marc.zyngier@arm.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <linux/preempt.h>
-#include <linux/kvm_host.h>
-#include <linux/wait.h>
-
-#include <asm/cputype.h>
-#include <asm/kvm_emulate.h>
-#include <asm/kvm_psci.h>
-#include <asm/kvm_host.h>
-
-#include <uapi/linux/psci.h>
-
-/*
- * This is an implementation of the Power State Coordination Interface
- * as described in ARM document number ARM DEN 0022A.
- */
-
-#define AFFINITY_MASK(level) ~((0x1UL << ((level) * MPIDR_LEVEL_BITS)) - 1)
-
-static unsigned long psci_affinity_mask(unsigned long affinity_level)
-{
- if (affinity_level <= 3)
- return MPIDR_HWID_BITMASK & AFFINITY_MASK(affinity_level);
-
- return 0;
-}
-
-static unsigned long kvm_psci_vcpu_suspend(struct kvm_vcpu *vcpu)
-{
- /*
- * NOTE: For simplicity, we make VCPU suspend emulation to be
- * same-as WFI (Wait-for-interrupt) emulation.
- *
- * This means for KVM the wakeup events are interrupts and
- * this is consistent with intended use of StateID as described
- * in section 5.4.1 of PSCI v0.2 specification (ARM DEN 0022A).
- *
- * Further, we also treat power-down request to be same as
- * stand-by request as-per section 5.4.2 clause 3 of PSCI v0.2
- * specification (ARM DEN 0022A). This means all suspend states
- * for KVM will preserve the register state.
- */
- kvm_vcpu_block(vcpu);
-
- return PSCI_RET_SUCCESS;
-}
-
-static void kvm_psci_vcpu_off(struct kvm_vcpu *vcpu)
-{
- vcpu->arch.power_off = true;
-}
-
-static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
-{
- struct kvm *kvm = source_vcpu->kvm;
- struct kvm_vcpu *vcpu = NULL;
- struct swait_queue_head *wq;
- unsigned long cpu_id;
- unsigned long context_id;
- phys_addr_t target_pc;
-
- cpu_id = vcpu_get_reg(source_vcpu, 1) & MPIDR_HWID_BITMASK;
- if (vcpu_mode_is_32bit(source_vcpu))
- cpu_id &= ~((u32) 0);
-
- vcpu = kvm_mpidr_to_vcpu(kvm, cpu_id);
-
- /*
- * Make sure the caller requested a valid CPU and that the CPU is
- * turned off.
- */
- if (!vcpu)
- return PSCI_RET_INVALID_PARAMS;
- if (!vcpu->arch.power_off) {
- if (kvm_psci_version(source_vcpu) != KVM_ARM_PSCI_0_1)
- return PSCI_RET_ALREADY_ON;
- else
- return PSCI_RET_INVALID_PARAMS;
- }
-
- target_pc = vcpu_get_reg(source_vcpu, 2);
- context_id = vcpu_get_reg(source_vcpu, 3);
-
- kvm_reset_vcpu(vcpu);
-
- /* Gracefully handle Thumb2 entry point */
- if (vcpu_mode_is_32bit(vcpu) && (target_pc & 1)) {
- target_pc &= ~((phys_addr_t) 1);
- vcpu_set_thumb(vcpu);
- }
-
- /* Propagate caller endianness */
- if (kvm_vcpu_is_be(source_vcpu))
- kvm_vcpu_set_be(vcpu);
-
- *vcpu_pc(vcpu) = target_pc;
- /*
- * NOTE: We always update r0 (or x0) because for PSCI v0.1
- * the general puspose registers are undefined upon CPU_ON.
- */
- vcpu_set_reg(vcpu, 0, context_id);
- vcpu->arch.power_off = false;
- smp_mb(); /* Make sure the above is visible */
-
- wq = kvm_arch_vcpu_wq(vcpu);
- swake_up(wq);
-
- return PSCI_RET_SUCCESS;
-}
-
-static unsigned long kvm_psci_vcpu_affinity_info(struct kvm_vcpu *vcpu)
-{
- int i, matching_cpus = 0;
- unsigned long mpidr;
- unsigned long target_affinity;
- unsigned long target_affinity_mask;
- unsigned long lowest_affinity_level;
- struct kvm *kvm = vcpu->kvm;
- struct kvm_vcpu *tmp;
-
- target_affinity = vcpu_get_reg(vcpu, 1);
- lowest_affinity_level = vcpu_get_reg(vcpu, 2);
-
- /* Determine target affinity mask */
- target_affinity_mask = psci_affinity_mask(lowest_affinity_level);
- if (!target_affinity_mask)
- return PSCI_RET_INVALID_PARAMS;
-
- /* Ignore other bits of target affinity */
- target_affinity &= target_affinity_mask;
-
- /*
- * If one or more VCPU matching target affinity are running
- * then ON else OFF
- */
- kvm_for_each_vcpu(i, tmp, kvm) {
- mpidr = kvm_vcpu_get_mpidr_aff(tmp);
- if ((mpidr & target_affinity_mask) == target_affinity) {
- matching_cpus++;
- if (!tmp->arch.power_off)
- return PSCI_0_2_AFFINITY_LEVEL_ON;
- }
- }
-
- if (!matching_cpus)
- return PSCI_RET_INVALID_PARAMS;
-
- return PSCI_0_2_AFFINITY_LEVEL_OFF;
-}
-
-static void kvm_prepare_system_event(struct kvm_vcpu *vcpu, u32 type)
-{
- int i;
- struct kvm_vcpu *tmp;
-
- /*
- * The KVM ABI specifies that a system event exit may call KVM_RUN
- * again and may perform shutdown/reboot at a later time that when the
- * actual request is made. Since we are implementing PSCI and a
- * caller of PSCI reboot and shutdown expects that the system shuts
- * down or reboots immediately, let's make sure that VCPUs are not run
- * after this call is handled and before the VCPUs have been
- * re-initialized.
- */
- kvm_for_each_vcpu(i, tmp, vcpu->kvm) {
- tmp->arch.power_off = true;
- kvm_vcpu_kick(tmp);
- }
-
- memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
- vcpu->run->system_event.type = type;
- vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
-}
-
-static void kvm_psci_system_off(struct kvm_vcpu *vcpu)
-{
- kvm_prepare_system_event(vcpu, KVM_SYSTEM_EVENT_SHUTDOWN);
-}
-
-static void kvm_psci_system_reset(struct kvm_vcpu *vcpu)
-{
- kvm_prepare_system_event(vcpu, KVM_SYSTEM_EVENT_RESET);
-}
-
-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 int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
-{
- struct kvm *kvm = vcpu->kvm;
- unsigned long psci_fn = vcpu_get_reg(vcpu, 0) & ~((u32) 0);
- unsigned long val;
- int ret = 1;
-
- 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_SUSPEND:
- case PSCI_0_2_FN64_CPU_SUSPEND:
- val = kvm_psci_vcpu_suspend(vcpu);
- 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:
- mutex_lock(&kvm->lock);
- val = kvm_psci_vcpu_on(vcpu);
- mutex_unlock(&kvm->lock);
- break;
- case PSCI_0_2_FN_AFFINITY_INFO:
- case PSCI_0_2_FN64_AFFINITY_INFO:
- val = kvm_psci_vcpu_affinity_info(vcpu);
- 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_SYSTEM_OFF:
- kvm_psci_system_off(vcpu);
- /*
- * We should'nt be going back to guest VCPU after
- * receiving SYSTEM_OFF request.
- *
- * If user space accidently/deliberately resumes
- * guest VCPU after SYSTEM_OFF request then guest
- * VCPU should see internal failure from PSCI return
- * value. To achieve this, we preload r0 (or x0) with
- * PSCI return value INTERNAL_FAILURE.
- */
- val = PSCI_RET_INTERNAL_FAILURE;
- ret = 0;
- break;
- case PSCI_0_2_FN_SYSTEM_RESET:
- kvm_psci_system_reset(vcpu);
- /*
- * Same reason as SYSTEM_OFF for preloading r0 (or x0)
- * with PSCI return value INTERNAL_FAILURE.
- */
- val = PSCI_RET_INTERNAL_FAILURE;
- ret = 0;
- break;
- default:
- val = PSCI_RET_NOT_SUPPORTED;
- break;
- }
-
- vcpu_set_reg(vcpu, 0, val);
- return ret;
-}
-
-static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
-{
- struct kvm *kvm = vcpu->kvm;
- unsigned long psci_fn = vcpu_get_reg(vcpu, 0) & ~((u32) 0);
- unsigned long val;
-
- switch (psci_fn) {
- case KVM_PSCI_FN_CPU_OFF:
- kvm_psci_vcpu_off(vcpu);
- val = PSCI_RET_SUCCESS;
- break;
- case KVM_PSCI_FN_CPU_ON:
- mutex_lock(&kvm->lock);
- val = kvm_psci_vcpu_on(vcpu);
- mutex_unlock(&kvm->lock);
- break;
- default:
- val = PSCI_RET_NOT_SUPPORTED;
- break;
- }
-
- vcpu_set_reg(vcpu, 0, val);
- return 1;
-}
-
-/**
- * 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.
- *
- * This function returns: > 0 (success), 0 (success but exit to user
- * space), and < 0 (errors)
- *
- * Errors:
- * -EINVAL: Unrecognized PSCI function
- */
-int 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 -EINVAL;
- };
-}