e8c2d99f82
This patch adds support for running Cortex-A7 guests on Cortex-A7 hosts. As Cortex-A7 is architecturally compatible with A15, this patch is largely just generalising existing code. Areas where 'implementation defined' behaviour is identical for A7 and A15 is moved to allow it to be used by both cores. The check to ensure that coprocessor register tables are sorted correctly is also moved in to 'common' code to avoid each new cpu doing its own check (and possibly forgetting to do so!) Signed-off-by: Jonathan Austin <jonathan.austin@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
262 lines
6.4 KiB
C
262 lines
6.4 KiB
C
/*
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* Copyright (C) 2012 - Virtual Open Systems and Columbia University
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* Author: Christoffer Dall <c.dall@virtualopensystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/kvm_host.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <asm/cputype.h>
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#include <asm/uaccess.h>
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#include <asm/kvm.h>
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#include <asm/kvm_asm.h>
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#include <asm/kvm_emulate.h>
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#include <asm/kvm_coproc.h>
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#define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
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#define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
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struct kvm_stats_debugfs_item debugfs_entries[] = {
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{ NULL }
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};
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int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
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{
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return 0;
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}
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static u64 core_reg_offset_from_id(u64 id)
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{
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return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
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}
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static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
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{
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u32 __user *uaddr = (u32 __user *)(long)reg->addr;
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struct kvm_regs *regs = &vcpu->arch.regs;
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u64 off;
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if (KVM_REG_SIZE(reg->id) != 4)
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return -ENOENT;
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/* Our ID is an index into the kvm_regs struct. */
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off = core_reg_offset_from_id(reg->id);
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if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
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return -ENOENT;
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return put_user(((u32 *)regs)[off], uaddr);
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}
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static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
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{
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u32 __user *uaddr = (u32 __user *)(long)reg->addr;
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struct kvm_regs *regs = &vcpu->arch.regs;
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u64 off, val;
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if (KVM_REG_SIZE(reg->id) != 4)
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return -ENOENT;
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/* Our ID is an index into the kvm_regs struct. */
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off = core_reg_offset_from_id(reg->id);
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if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
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return -ENOENT;
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if (get_user(val, uaddr) != 0)
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return -EFAULT;
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if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
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unsigned long mode = val & MODE_MASK;
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switch (mode) {
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case USR_MODE:
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case FIQ_MODE:
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case IRQ_MODE:
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case SVC_MODE:
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case ABT_MODE:
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case UND_MODE:
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break;
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default:
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return -EINVAL;
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}
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}
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((u32 *)regs)[off] = val;
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return 0;
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}
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int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
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{
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return -EINVAL;
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}
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int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
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{
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return -EINVAL;
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}
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static unsigned long num_core_regs(void)
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{
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return sizeof(struct kvm_regs) / sizeof(u32);
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}
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/**
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* kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
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*
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* This is for all registers.
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*/
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unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
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{
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return num_core_regs() + kvm_arm_num_coproc_regs(vcpu);
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}
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/**
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* kvm_arm_copy_reg_indices - get indices of all registers.
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*
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* We do core registers right here, then we apppend coproc regs.
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*/
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int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
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{
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unsigned int i;
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const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
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for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
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if (put_user(core_reg | i, uindices))
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return -EFAULT;
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uindices++;
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}
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return kvm_arm_copy_coproc_indices(vcpu, uindices);
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}
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int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
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{
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/* We currently use nothing arch-specific in upper 32 bits */
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if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
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return -EINVAL;
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/* Register group 16 means we want a core register. */
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if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
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return get_core_reg(vcpu, reg);
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return kvm_arm_coproc_get_reg(vcpu, reg);
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}
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int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
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{
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/* We currently use nothing arch-specific in upper 32 bits */
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if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
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return -EINVAL;
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/* Register group 16 means we set a core register. */
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if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
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return set_core_reg(vcpu, reg);
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return kvm_arm_coproc_set_reg(vcpu, reg);
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}
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int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
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struct kvm_sregs *sregs)
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{
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return -EINVAL;
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}
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int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
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struct kvm_sregs *sregs)
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{
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return -EINVAL;
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}
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int __attribute_const__ kvm_target_cpu(void)
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{
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unsigned long implementor = read_cpuid_implementor();
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unsigned long part_number = read_cpuid_part_number();
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if (implementor != ARM_CPU_IMP_ARM)
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return -EINVAL;
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switch (part_number) {
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case ARM_CPU_PART_CORTEX_A7:
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return KVM_ARM_TARGET_CORTEX_A7;
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case ARM_CPU_PART_CORTEX_A15:
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return KVM_ARM_TARGET_CORTEX_A15;
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default:
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return -EINVAL;
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}
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}
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int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
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const struct kvm_vcpu_init *init)
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{
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unsigned int i;
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/* We can only cope with guest==host and only on A15/A7 (for now). */
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if (init->target != kvm_target_cpu())
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return -EINVAL;
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vcpu->arch.target = init->target;
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bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
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/* -ENOENT for unknown features, -EINVAL for invalid combinations. */
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for (i = 0; i < sizeof(init->features) * 8; i++) {
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if (test_bit(i, (void *)init->features)) {
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if (i >= KVM_VCPU_MAX_FEATURES)
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return -ENOENT;
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set_bit(i, vcpu->arch.features);
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}
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}
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/* Now we know what it is, we can reset it. */
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return kvm_reset_vcpu(vcpu);
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}
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int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
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{
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int target = kvm_target_cpu();
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if (target < 0)
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return -ENODEV;
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memset(init, 0, sizeof(*init));
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/*
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* For now, we don't return any features.
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* In future, we might use features to return target
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* specific features available for the preferred
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* target type.
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*/
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init->target = (__u32)target;
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return 0;
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}
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int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
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{
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return -EINVAL;
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}
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int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
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{
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return -EINVAL;
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}
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int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
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struct kvm_translation *tr)
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{
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return -EINVAL;
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}
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