mirror of https://gitee.com/openkylin/linux.git
arm64: KVM: guest one-reg interface
Let userspace play with the guest registers. Reviewed-by: Christopher Covington <cov@codeaurora.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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Marc Zyngier
parent
d7246bf357
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2f4a07c5f9
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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 <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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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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vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
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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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/*
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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 (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 (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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u32 mode = (*(u32 *)valp) & COMPAT_PSR_MODE_MASK;
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switch (mode) {
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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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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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* 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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}
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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 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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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_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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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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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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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_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_A57:
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/* Currently handled by the generic backend */
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return KVM_ARM_TARGET_CORTEX_A57;
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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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int phys_target = kvm_target_cpu();
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if (init->target != phys_target)
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return -EINVAL;
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vcpu->arch.target = phys_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 (init->features[i / 32] & (1 << (i % 32))) {
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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_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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