arch/arm64/kvm/guest.c - maze/linux - Git at Google

 /*
  * 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>
  *
  * 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/errno.h>
 #include <linux/err.h>
 #include <linux/kvm_host.h>
 #include <linux/module.h>
 #include <linux/vmalloc.h>
 #include <linux/fs.h>
 #include <asm/cputype.h>
 #include <asm/uaccess.h>
 #include <asm/kvm.h>
 #include <asm/kvm_asm.h>
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_coproc.h>

 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	{ NULL }
 };

 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 {
 	vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
 	return 0;
 }

 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 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 (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. */
 	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 (KVM_REG_SIZE(reg->id) > sizeof(tmp))
 		return -EINVAL;

 	if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
 		err = -EFAULT;
 		goto out;
 	}

 	if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
 		u32 mode = (*(u32 *)valp) & COMPAT_PSR_MODE_MASK;
 		switch (mode) {
 		case COMPAT_PSR_MODE_USR:
 		case COMPAT_PSR_MODE_FIQ:
 		case COMPAT_PSR_MODE_IRQ:
 		case COMPAT_PSR_MODE_SVC:
 		case COMPAT_PSR_MODE_ABT:
 		case COMPAT_PSR_MODE_UND:
 		case PSR_MODE_EL0t:
 		case PSR_MODE_EL1t:
 		case PSR_MODE_EL1h:
 			break;
 		default:
 			err = -EINVAL;
 			goto out;
 		}
 	}

 	memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
 out:
 	return err;
 }

 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 {
 	return -EINVAL;
 }

 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 {
 	return -EINVAL;
 }

 static unsigned long num_core_regs(void)
 {
 	return sizeof(struct kvm_regs) / sizeof(__u32);
 }

 /**
  * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
  *
  * This is for all registers.
  */
 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
 {
 	return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu);
 }

 /**
  * kvm_arm_copy_reg_indices - get indices of all registers.
  *
  * We do core registers right here, then we apppend system regs.
  */
 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
 {
 	unsigned int i;
 	const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;

 	for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
 		if (put_user(core_reg | i, uindices))
 			return -EFAULT;
 		uindices++;
 	}

 	return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
 }

 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 {
 	/* We currently use nothing arch-specific in upper 32 bits */
 	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
 		return -EINVAL;

 	/* Register group 16 means we want a core register. */
 	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
 		return get_core_reg(vcpu, reg);

 	return kvm_arm_sys_reg_get_reg(vcpu, reg);
 }

 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 {
 	/* We currently use nothing arch-specific in upper 32 bits */
 	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
 		return -EINVAL;

 	/* Register group 16 means we set a core register. */
 	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
 		return set_core_reg(vcpu, reg);

 	return kvm_arm_sys_reg_set_reg(vcpu, reg);
 }

 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 				  struct kvm_sregs *sregs)
 {
 	return -EINVAL;
 }

 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 				  struct kvm_sregs *sregs)
 {
 	return -EINVAL;
 }

 int __attribute_const__ kvm_target_cpu(void)
 {
 	unsigned long implementor = read_cpuid_implementor();
 	unsigned long part_number = read_cpuid_part_number();

 	if (implementor != ARM_CPU_IMP_ARM)
 		return -EINVAL;

 	switch (part_number) {
 	case ARM_CPU_PART_AEM_V8:
 		return KVM_ARM_TARGET_AEM_V8;
 	case ARM_CPU_PART_FOUNDATION:
 		return KVM_ARM_TARGET_FOUNDATION_V8;
 	case ARM_CPU_PART_CORTEX_A57:
 		/* Currently handled by the generic backend */
 		return KVM_ARM_TARGET_CORTEX_A57;
 	default:
 		return -EINVAL;
 	}
 }

 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 			const struct kvm_vcpu_init *init)
 {
 	unsigned int i;
 	int phys_target = kvm_target_cpu();

 	if (init->target != phys_target)
 		return -EINVAL;

 	vcpu->arch.target = phys_target;
 	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);

 	/* -ENOENT for unknown features, -EINVAL for invalid combinations. */
 	for (i = 0; i < sizeof(init->features) * 8; i++) {
 		if (init->features[i / 32] & (1 << (i % 32))) {
 			if (i >= KVM_VCPU_MAX_FEATURES)
 				return -ENOENT;
 			set_bit(i, vcpu->arch.features);
 		}
 	}

 	/* Now we know what it is, we can reset it. */
 	return kvm_reset_vcpu(vcpu);
 }

 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;
 }
	/*
	* 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>
	*
	* 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/errno.h>
	#include <linux/err.h>
	#include <linux/kvm_host.h>
	#include <linux/module.h>
	#include <linux/vmalloc.h>
	#include <linux/fs.h>
	#include <asm/cputype.h>
	#include <asm/uaccess.h>
	#include <asm/kvm.h>
	#include <asm/kvm_asm.h>
	#include <asm/kvm_emulate.h>
	#include <asm/kvm_coproc.h>

	struct kvm_stats_debugfs_item debugfs_entries[] = {
	{ NULL }
	};

	int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
	{
	vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
	return 0;
	}

	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 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 (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. */
	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 (KVM_REG_SIZE(reg->id) > sizeof(tmp))
	return -EINVAL;

	if (copy_from_user(valp, uaddr, KVM_REG_SIZE(reg->id))) {
	err = -EFAULT;
	goto out;
	}

	if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
	u32 mode = ((u32 )valp) & COMPAT_PSR_MODE_MASK;
	switch (mode) {
	case COMPAT_PSR_MODE_USR:
	case COMPAT_PSR_MODE_FIQ:
	case COMPAT_PSR_MODE_IRQ:
	case COMPAT_PSR_MODE_SVC:
	case COMPAT_PSR_MODE_ABT:
	case COMPAT_PSR_MODE_UND:
	case PSR_MODE_EL0t:
	case PSR_MODE_EL1t:
	case PSR_MODE_EL1h:
	break;
	default:
	err = -EINVAL;
	goto out;
	}
	}

	memcpy((u32 *)regs + off, valp, KVM_REG_SIZE(reg->id));
	out:
	return err;
	}

	int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu vcpu, struct kvm_regs regs)
	{
	return -EINVAL;
	}

	int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu vcpu, struct kvm_regs regs)
	{
	return -EINVAL;
	}

	static unsigned long num_core_regs(void)
	{
	return sizeof(struct kvm_regs) / sizeof(__u32);
	}

	/**
	* kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
	*
	* This is for all registers.
	*/
	unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
	{
	return num_core_regs() + kvm_arm_num_sys_reg_descs(vcpu);
	}

	/**
	* kvm_arm_copy_reg_indices - get indices of all registers.
	*
	* We do core registers right here, then we apppend system regs.
	*/
	int kvm_arm_copy_reg_indices(struct kvm_vcpu vcpu, u64 __user uindices)
	{
	unsigned int i;
	const u64 core_reg = KVM_REG_ARM64 \| KVM_REG_SIZE_U64 \| KVM_REG_ARM_CORE;

	for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
	if (put_user(core_reg \| i, uindices))
	return -EFAULT;
	uindices++;
	}

	return kvm_arm_copy_sys_reg_indices(vcpu, uindices);
	}

	int kvm_arm_get_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	{
	/* We currently use nothing arch-specific in upper 32 bits */
	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
	return -EINVAL;

	/* Register group 16 means we want a core register. */
	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
	return get_core_reg(vcpu, reg);

	return kvm_arm_sys_reg_get_reg(vcpu, reg);
	}

	int kvm_arm_set_reg(struct kvm_vcpu vcpu, const struct kvm_one_reg reg)
	{
	/* We currently use nothing arch-specific in upper 32 bits */
	if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM64 >> 32)
	return -EINVAL;

	/* Register group 16 means we set a core register. */
	if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
	return set_core_reg(vcpu, reg);

	return kvm_arm_sys_reg_set_reg(vcpu, reg);
	}

	int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
	struct kvm_sregs *sregs)
	{
	return -EINVAL;
	}

	int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
	struct kvm_sregs *sregs)
	{
	return -EINVAL;
	}

	int __attribute_const__ kvm_target_cpu(void)
	{
	unsigned long implementor = read_cpuid_implementor();
	unsigned long part_number = read_cpuid_part_number();

	if (implementor != ARM_CPU_IMP_ARM)
	return -EINVAL;

	switch (part_number) {
	case ARM_CPU_PART_AEM_V8:
	return KVM_ARM_TARGET_AEM_V8;
	case ARM_CPU_PART_FOUNDATION:
	return KVM_ARM_TARGET_FOUNDATION_V8;
	case ARM_CPU_PART_CORTEX_A57:
	/* Currently handled by the generic backend */
	return KVM_ARM_TARGET_CORTEX_A57;
	default:
	return -EINVAL;
	}
	}

	int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
	const struct kvm_vcpu_init *init)
	{
	unsigned int i;
	int phys_target = kvm_target_cpu();

	if (init->target != phys_target)
	return -EINVAL;

	vcpu->arch.target = phys_target;
	bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);

	/* -ENOENT for unknown features, -EINVAL for invalid combinations. */
	for (i = 0; i < sizeof(init->features) * 8; i++) {
	if (init->features[i / 32] & (1 << (i % 32))) {
	if (i >= KVM_VCPU_MAX_FEATURES)
	return -ENOENT;
	set_bit(i, vcpu->arch.features);
	}
	}

	/* Now we know what it is, we can reset it. */
	return kvm_reset_vcpu(vcpu);
	}

	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;
	}