// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012,2013 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* Derived from arch/arm/kvm/guest.c:
* Copyright (C) 2012 - Virtual Open Systems and Columbia University
* Author: Christoffer Dall <c.dall@virtualopensystems.com>
*/
#include <linux/bits.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/nospec.h>
#include <linux/kvm_host.h>
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <kvm/arm_psci.h>
#include <asm/cputype.h>
#include <linux/uaccess.h>
#include <asm/fpsimd.h>
#include <asm/kvm.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_coproc.h>
#include <asm/kvm_host.h>
#include <asm/sigcontext.h>
#include "trace.h"
#define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
#define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT(halt_successful_poll),
VCPU_STAT(halt_attempted_poll),
VCPU_STAT(halt_poll_invalid),
VCPU_STAT(halt_wakeup),
VCPU_STAT(hvc_exit_stat),
VCPU_STAT(wfe_exit_stat),
VCPU_STAT(wfi_exit_stat),
VCPU_STAT(mmio_exit_user),
VCPU_STAT(mmio_exit_kernel),
VCPU_STAT(exits),
{ NULL }
};
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
return 0;
}
static bool core_reg_offset_is_vreg(u64 off)
{
return off >= KVM_REG_ARM_CORE_REG(fp_regs.vregs) &&
off < KVM_REG_ARM_CORE_REG(fp_regs.fpsr);
}
static u64 core_reg_offset_from_id(u64 id)
{
return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
}
static int core_reg_size_from_offset(const struct kvm_vcpu *vcpu, u64 off)
{
int size;
switch (off) {
case KVM_REG_ARM_CORE_REG(regs.regs[0]) ...
KVM_REG_ARM_CORE_REG(regs.regs[30]):
case KVM_REG_ARM_CORE_REG(regs.sp):
case KVM_REG_ARM_CORE_REG(regs.pc):
case KVM_REG_ARM_CORE_REG(regs.pstate):
case KVM_REG_ARM_CORE_REG(sp_el1):
case KVM_REG_ARM_CORE_REG(elr_el1):
case KVM_REG_ARM_CORE_REG(spsr[0]) ...
KVM_REG_ARM_CORE_REG(spsr[KVM_NR_SPSR - 1]):
size = sizeof(__u64);
break;
case KVM_REG_ARM_CORE_REG(fp_regs.vregs[0]) ...
KVM_REG_ARM_CORE_REG(fp_regs.vregs[31]):
size = sizeof(__uint128_t);
break;
case KVM_REG_ARM_CORE_REG(fp_regs.fpsr):
case KVM_REG_ARM_CORE_REG(fp_regs.fpcr):
size = sizeof(__u32);
break;
default:
return -EINVAL;
}
if (!IS_ALIGNED(off, size / sizeof(__u32)))
return -EINVAL;
/*
* The KVM_REG_ARM64_SVE regs must be used instead of
* KVM_REG_ARM_CORE for accessing the FPSIMD V-registers on
* SVE-enabled vcpus:
*/
if (vcpu_has_sve(vcpu) && core_reg_offset_is_vreg(off))
return -EINVAL;
return size;
}
static int validate_core_offset(const struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
u64 off = core_reg_offset_from_id(reg->id);
int size = core_reg_size_from_offset(vcpu, off);
if (size < 0)
return -EINVAL;
if (KVM_REG_SIZE(reg->id) != size)
return -EINVAL;
return 0;
}
static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
/*
* Because the kvm_regs structure is a mix of 32, 64 and
* 128bit fields, we index it as if it was a 32bit
* array. Hence below, nr_regs is the number of entries, and
* off the index in the "array".
*/
__u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
struct kvm_regs *regs = vcpu_gp_regs(vcpu);
int nr_regs = sizeof(*regs) / sizeof(__u32);
u32 off;
/* Our ID is an index into the kvm_regs struct. */
off = core_reg_offset_from_id(reg->id);
if (off >= nr_regs ||
(off + (KVM_REG_SIZE(reg->id) / sizeof(__u32))) >= nr_regs)
return -ENOENT;
if (validate_core_offset(vcpu, reg))
return -EINVAL;
if (copy_to_user(uaddr, ((u32 *)regs) + off, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
__u32 __user *uaddr = (__u32 __user *)(unsigned long)reg->addr;
struct kvm_regs *regs = vcpu_gp_regs(vcpu);
int nr_regs = sizeof(*regs) / sizeof(__u32);
__uint128_t tmp;
void *valp = &tmp;
u64 off;
int err = 0;
/* Our ID is an index into the kvm_regs struct. */