499 lines
12 KiB
C
499 lines
12 KiB
C
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/*
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* Copyright (C) 2012,2013 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* Derived from arch/arm/kvm/guest.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, see <http://www.gnu.org/licenses/>.
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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 <kvm/arm_psci.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_emulate.h>
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#include <asm/kvm_coproc.h>
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#include "trace.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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VCPU_STAT(hvc_exit_stat),
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VCPU_STAT(wfe_exit_stat),
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VCPU_STAT(wfi_exit_stat),
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VCPU_STAT(mmio_exit_user),
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VCPU_STAT(mmio_exit_kernel),
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VCPU_STAT(exits),
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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 validate_core_offset(const struct kvm_one_reg *reg)
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{
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u64 off = core_reg_offset_from_id(reg->id);
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int size;
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switch (off) {
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case KVM_REG_ARM_CORE_REG(regs.regs[0]) ...
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KVM_REG_ARM_CORE_REG(regs.regs[30]):
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case KVM_REG_ARM_CORE_REG(regs.sp):
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case KVM_REG_ARM_CORE_REG(regs.pc):
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case KVM_REG_ARM_CORE_REG(regs.pstate):
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case KVM_REG_ARM_CORE_REG(sp_el1):
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case KVM_REG_ARM_CORE_REG(elr_el1):
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case KVM_REG_ARM_CORE_REG(spsr[0]) ...
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KVM_REG_ARM_CORE_REG(spsr[KVM_NR_SPSR - 1]):
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size = sizeof(__u64);
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break;
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case KVM_REG_ARM_CORE_REG(fp_regs.vregs[0]) ...
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KVM_REG_ARM_CORE_REG(fp_regs.vregs[31]):
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size = sizeof(__uint128_t);
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break;
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case KVM_REG_ARM_CORE_REG(fp_regs.fpsr):
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case KVM_REG_ARM_CORE_REG(fp_regs.fpcr):
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size = sizeof(__u32);
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break;
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default:
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return -EINVAL;
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}
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if (KVM_REG_SIZE(reg->id) == size &&
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IS_ALIGNED(off, size / sizeof(__u32)))
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return 0;
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return -EINVAL;
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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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/*
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* Because the kvm_regs structure is a mix of 32, 64 and
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* 128bit fields, we index it as if it was a 32bit
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* array. Hence below, nr_regs is the number of entries, and
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* off the index in the "array".
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*/
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__u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
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struct kvm_regs *regs = vcpu_gp_regs(vcpu);
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int nr_regs = sizeof(*regs) / sizeof(__u32);
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u32 off;
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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 >= nr_regs ||
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(off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
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return -ENOENT;
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if (validate_core_offset(reg))
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return -EINVAL;
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if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
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return -EFAULT;
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return 0;
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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 *)(unsigned long)reg->addr;
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struct kvm_regs *regs = vcpu_gp_regs(vcpu);
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int nr_regs = sizeof(*regs) / sizeof(__u32);
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__uint128_t tmp;
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void *valp = &tmp;
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u64 off;
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int err = 0;
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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 >= nr_regs ||
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(off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
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return -ENOENT;
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if (validate_core_offset(reg))
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return -EINVAL;
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if (KVM_REG_SIZE(reg->id) > sizeof(tmp))
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return -EINVAL;
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if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
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err = -EFAULT;
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goto out;
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}
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if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
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u64 mode = (*(u64 *)valp) & COMPAT_PSR_MODE_MASK;
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switch (mode) {
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case COMPAT_PSR_MODE_USR:
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if (!system_supports_32bit_el0())
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return -EINVAL;
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break;
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case COMPAT_PSR_MODE_FIQ:
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case COMPAT_PSR_MODE_IRQ:
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case COMPAT_PSR_MODE_SVC:
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case COMPAT_PSR_MODE_ABT:
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case COMPAT_PSR_MODE_UND:
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if (!vcpu_el1_is_32bit(vcpu))
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return -EINVAL;
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break;
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case PSR_MODE_EL0t:
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case PSR_MODE_EL1t:
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case PSR_MODE_EL1h:
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if (vcpu_el1_is_32bit(vcpu))
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return -EINVAL;
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break;
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default:
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err = -EINVAL;
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goto out;
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}
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}
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memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
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out:
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return err;
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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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* ARM64 versions of the TIMER registers, always available on arm64
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*/
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#define NUM_TIMER_REGS 3
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static bool is_timer_reg(u64 index)
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{
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switch (index) {
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case KVM_REG_ARM_TIMER_CTL:
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case KVM_REG_ARM_TIMER_CNT:
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case KVM_REG_ARM_TIMER_CVAL:
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return true;
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}
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return false;
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}
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static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
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{
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if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
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return -EFAULT;
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uindices++;
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if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
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return -EFAULT;
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uindices++;
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if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
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return -EFAULT;
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return 0;
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}
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static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
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{
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void __user *uaddr = (void __user *)(long)reg->addr;
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u64 val;
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int ret;
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ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
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if (ret != 0)
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return -EFAULT;
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return kvm_arm_timer_set_reg(vcpu, reg->id, val);
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}
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static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
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{
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void __user *uaddr = (void __user *)(long)reg->addr;
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u64 val;
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val = kvm_arm_timer_get_reg(vcpu, reg->id);
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return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
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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_sys_reg_descs(vcpu)
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+ kvm_arm_get_fw_num_regs(vcpu) + NUM_TIMER_REGS;
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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 append system 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_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;
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int ret;
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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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ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
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if (ret)
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return ret;
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uindices += kvm_arm_get_fw_num_regs(vcpu);
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ret = copy_timer_indices(vcpu, uindices);
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if (ret)
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return ret;
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uindices += NUM_TIMER_REGS;
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return kvm_arm_copy_sys_reg_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_ARM64 >> 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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if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
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return kvm_arm_get_fw_reg(vcpu, reg);
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if (is_timer_reg(reg->id))
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return get_timer_reg(vcpu, reg);
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return kvm_arm_sys_reg_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_ARM64 >> 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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if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
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return kvm_arm_set_fw_reg(vcpu, reg);
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if (is_timer_reg(reg->id))
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return set_timer_reg(vcpu, reg);
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return kvm_arm_sys_reg_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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switch (implementor) {
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case ARM_CPU_IMP_ARM:
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switch (part_number) {
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case ARM_CPU_PART_AEM_V8:
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return KVM_ARM_TARGET_AEM_V8;
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case ARM_CPU_PART_FOUNDATION:
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return KVM_ARM_TARGET_FOUNDATION_V8;
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case ARM_CPU_PART_CORTEX_A53:
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|
|
return KVM_ARM_TARGET_CORTEX_A53;
|
||
|
|
case ARM_CPU_PART_CORTEX_A57:
|
||
|
|
return KVM_ARM_TARGET_CORTEX_A57;
|
||
|
|
};
|
||
|
|
break;
|
||
|
|
case ARM_CPU_IMP_APM:
|
||
|
|
switch (part_number) {
|
||
|
|
case APM_CPU_PART_POTENZA:
|
||
|
|
return KVM_ARM_TARGET_XGENE_POTENZA;
|
||
|
|
};
|
||
|
|
break;
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Return a default generic target */
|
||
|
|
return KVM_ARM_TARGET_GENERIC_V8;
|
||
|
|
}
|
||
|
|
|
||
|
|
int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
|
||
|
|
{
|
||
|
|
int target = kvm_target_cpu();
|
||
|
|
|
||
|
|
if (target < 0)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
memset(init, 0, sizeof(*init));
|
||
|
|
|
||
|
|
/*
|
||
|
|
* For now, we don't return any features.
|
||
|
|
* In future, we might use features to return target
|
||
|
|
* specific features available for the preferred
|
||
|
|
* target type.
|
||
|
|
*/
|
||
|
|
init->target = (__u32)target;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
|
||
|
|
{
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
|
||
|
|
{
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
|
||
|
|
struct kvm_translation *tr)
|
||
|
|
{
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define KVM_GUESTDBG_VALID_MASK (KVM_GUESTDBG_ENABLE | \
|
||
|
|
KVM_GUESTDBG_USE_SW_BP | \
|
||
|
|
KVM_GUESTDBG_USE_HW | \
|
||
|
|
KVM_GUESTDBG_SINGLESTEP)
|
||
|
|
|
||
|
|
/**
|
||
|
|
* kvm_arch_vcpu_ioctl_set_guest_debug - set up guest debugging
|
||
|
|
* @kvm: pointer to the KVM struct
|
||
|
|
* @kvm_guest_debug: the ioctl data buffer
|
||
|
|
*
|
||
|
|
* This sets up and enables the VM for guest debugging. Userspace
|
||
|
|
* passes in a control flag to enable different debug types and
|
||
|
|
* potentially other architecture specific information in the rest of
|
||
|
|
* the structure.
|
||
|
|
*/
|
||
|
|
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
|
||
|
|
struct kvm_guest_debug *dbg)
|
||
|
|
{
|
||
|
|
trace_kvm_set_guest_debug(vcpu, dbg->control);
|
||
|
|
|
||
|
|
if (dbg->control & ~KVM_GUESTDBG_VALID_MASK)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (dbg->control & KVM_GUESTDBG_ENABLE) {
|
||
|
|
vcpu->guest_debug = dbg->control;
|
||
|
|
|
||
|
|
/* Hardware assisted Break and Watch points */
|
||
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW) {
|
||
|
|
vcpu->arch.external_debug_state = dbg->arch;
|
||
|
|
}
|
||
|
|
|
||
|
|
} else {
|
||
|
|
/* If not enabled clear all flags */
|
||
|
|
vcpu->guest_debug = 0;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
|
||
|
|
struct kvm_device_attr *attr)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
switch (attr->group) {
|
||
|
|
case KVM_ARM_VCPU_PMU_V3_CTRL:
|
||
|
|
ret = kvm_arm_pmu_v3_set_attr(vcpu, attr);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
ret = -ENXIO;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
|
||
|
|
struct kvm_device_attr *attr)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
switch (attr->group) {
|
||
|
|
case KVM_ARM_VCPU_PMU_V3_CTRL:
|
||
|
|
ret = kvm_arm_pmu_v3_get_attr(vcpu, attr);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
ret = -ENXIO;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
|
||
|
|
struct kvm_device_attr *attr)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
switch (attr->group) {
|
||
|
|
case KVM_ARM_VCPU_PMU_V3_CTRL:
|
||
|
|
ret = kvm_arm_pmu_v3_has_attr(vcpu, attr);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
ret = -ENXIO;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|