linux/arch/arm/kvm/arm.c
Christoffer Dall 38f791a4e4 arm64: KVM: Implement 48 VA support for KVM EL2 and Stage-2
This patch adds the necessary support for all host kernel PGSIZE and
VA_SPACE configuration options for both EL2 and the Stage-2 page tables.

However, for 40bit and 42bit PARange systems, the architecture mandates
that VTCR_EL2.SL0 is maximum 1, resulting in fewer levels of stage-2
pagge tables than levels of host kernel page tables.  At the same time,
systems with a PARange > 42bit, we limit the IPA range by always setting
VTCR_EL2.T0SZ to 24.

To solve the situation with different levels of page tables for Stage-2
translation than the host kernel page tables, we allocate a dummy PGD
with pointers to our actual inital level Stage-2 page table, in order
for us to reuse the kernel pgtable manipulation primitives.  Reproducing
all these in KVM does not look pretty and unnecessarily complicates the
32-bit side.

Systems with a PARange < 40bits are not yet supported.

 [ I have reworked this patch from its original form submitted by
   Jungseok to take the architecture constraints into consideration.
   There were too many changes from the original patch for me to
   preserve the authorship.  Thanks to Catalin Marinas for his help in
   figuring out a good solution to this challenge.  I have also fixed
   various bugs and missing error code handling from the original
   patch. - Christoffer ]

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Jungseok Lee <jungseoklee85@gmail.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
2014-10-14 05:48:19 -07:00

1037 lines
22 KiB
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, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/cpu.h>
#include <linux/cpu_pm.h>
#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 <linux/mman.h>
#include <linux/sched.h>
#include <linux/kvm.h>
#include <trace/events/kvm.h>
#define CREATE_TRACE_POINTS
#include "trace.h"
#include <asm/uaccess.h>
#include <asm/ptrace.h>
#include <asm/mman.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
#include <asm/virt.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_coproc.h>
#include <asm/kvm_psci.h>
#ifdef REQUIRES_VIRT
__asm__(".arch_extension virt");
#endif
static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
static kvm_cpu_context_t __percpu *kvm_host_cpu_state;
static unsigned long hyp_default_vectors;
/* Per-CPU variable containing the currently running vcpu. */
static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
/* The VMID used in the VTTBR */
static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
static u8 kvm_next_vmid;
static DEFINE_SPINLOCK(kvm_vmid_lock);
static bool vgic_present;
static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
{
BUG_ON(preemptible());
__this_cpu_write(kvm_arm_running_vcpu, vcpu);
}
/**
* kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
* Must be called from non-preemptible context
*/
struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
{
BUG_ON(preemptible());
return __this_cpu_read(kvm_arm_running_vcpu);
}
/**
* kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
*/
struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
{
return &kvm_arm_running_vcpu;
}
int kvm_arch_hardware_enable(void)
{
return 0;
}
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
}
int kvm_arch_hardware_setup(void)
{
return 0;
}
void kvm_arch_check_processor_compat(void *rtn)
{
*(int *)rtn = 0;
}
/**
* kvm_arch_init_vm - initializes a VM data structure
* @kvm: pointer to the KVM struct
*/
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
int ret = 0;
if (type)
return -EINVAL;
ret = kvm_alloc_stage2_pgd(kvm);
if (ret)
goto out_fail_alloc;
ret = create_hyp_mappings(kvm, kvm + 1);
if (ret)
goto out_free_stage2_pgd;
kvm_timer_init(kvm);
/* Mark the initial VMID generation invalid */
kvm->arch.vmid_gen = 0;
return ret;
out_free_stage2_pgd:
kvm_free_stage2_pgd(kvm);
out_fail_alloc:
return ret;
}
int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
return VM_FAULT_SIGBUS;
}
/**
* kvm_arch_destroy_vm - destroy the VM data structure
* @kvm: pointer to the KVM struct
*/
void kvm_arch_destroy_vm(struct kvm *kvm)
{
int i;
kvm_free_stage2_pgd(kvm);
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
if (kvm->vcpus[i]) {
kvm_arch_vcpu_free(kvm->vcpus[i]);
kvm->vcpus[i] = NULL;
}
}
kvm_vgic_destroy(kvm);
}
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
{
int r;
switch (ext) {
case KVM_CAP_IRQCHIP:
r = vgic_present;
break;
case KVM_CAP_DEVICE_CTRL:
case KVM_CAP_USER_MEMORY:
case KVM_CAP_SYNC_MMU:
case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
case KVM_CAP_ONE_REG:
case KVM_CAP_ARM_PSCI:
case KVM_CAP_ARM_PSCI_0_2:
case KVM_CAP_READONLY_MEM:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
r = KVM_COALESCED_MMIO_PAGE_OFFSET;
break;
case KVM_CAP_ARM_SET_DEVICE_ADDR:
r = 1;
break;
case KVM_CAP_NR_VCPUS:
r = num_online_cpus();
break;
case KVM_CAP_MAX_VCPUS:
r = KVM_MAX_VCPUS;
break;
default:
r = kvm_arch_dev_ioctl_check_extension(ext);
break;
}
return r;
}
long kvm_arch_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
return -EINVAL;
}
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
{
int err;
struct kvm_vcpu *vcpu;
vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
if (!vcpu) {
err = -ENOMEM;
goto out;
}
err = kvm_vcpu_init(vcpu, kvm, id);
if (err)
goto free_vcpu;
err = create_hyp_mappings(vcpu, vcpu + 1);
if (err)
goto vcpu_uninit;
return vcpu;
vcpu_uninit:
kvm_vcpu_uninit(vcpu);
free_vcpu:
kmem_cache_free(kvm_vcpu_cache, vcpu);
out:
return ERR_PTR(err);
}
int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
return 0;
}
void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
{
kvm_mmu_free_memory_caches(vcpu);
kvm_timer_vcpu_terminate(vcpu);
kvm_vgic_vcpu_destroy(vcpu);
kmem_cache_free(kvm_vcpu_cache, vcpu);
}
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
kvm_arch_vcpu_free(vcpu);
}
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
return 0;
}
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
/* Force users to call KVM_ARM_VCPU_INIT */
vcpu->arch.target = -1;
/* Set up the timer */
kvm_timer_vcpu_init(vcpu);
return 0;
}
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
vcpu->cpu = cpu;
vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state);
/*
* Check whether this vcpu requires the cache to be flushed on
* this physical CPU. This is a consequence of doing dcache
* operations by set/way on this vcpu. We do it here to be in
* a non-preemptible section.
*/
if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush))
flush_cache_all(); /* We'd really want v7_flush_dcache_all() */
kvm_arm_set_running_vcpu(vcpu);
}
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
/*
* The arch-generic KVM code expects the cpu field of a vcpu to be -1
* if the vcpu is no longer assigned to a cpu. This is used for the
* optimized make_all_cpus_request path.
*/
vcpu->cpu = -1;
kvm_arm_set_running_vcpu(NULL);
}
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
struct kvm_guest_debug *dbg)
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
return -EINVAL;
}
/**
* kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
* @v: The VCPU pointer
*
* If the guest CPU is not waiting for interrupts or an interrupt line is
* asserted, the CPU is by definition runnable.
*/
int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v);
}
/* Just ensure a guest exit from a particular CPU */
static void exit_vm_noop(void *info)
{
}
void force_vm_exit(const cpumask_t *mask)
{
smp_call_function_many(mask, exit_vm_noop, NULL, true);
}
/**
* need_new_vmid_gen - check that the VMID is still valid
* @kvm: The VM's VMID to checkt
*
* return true if there is a new generation of VMIDs being used
*
* The hardware supports only 256 values with the value zero reserved for the
* host, so we check if an assigned value belongs to a previous generation,
* which which requires us to assign a new value. If we're the first to use a
* VMID for the new generation, we must flush necessary caches and TLBs on all
* CPUs.
*/
static bool need_new_vmid_gen(struct kvm *kvm)
{
return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
}
/**
* update_vttbr - Update the VTTBR with a valid VMID before the guest runs
* @kvm The guest that we are about to run
*
* Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
* VM has a valid VMID, otherwise assigns a new one and flushes corresponding
* caches and TLBs.
*/
static void update_vttbr(struct kvm *kvm)
{
phys_addr_t pgd_phys;
u64 vmid;
if (!need_new_vmid_gen(kvm))
return;
spin_lock(&kvm_vmid_lock);
/*
* We need to re-check the vmid_gen here to ensure that if another vcpu
* already allocated a valid vmid for this vm, then this vcpu should
* use the same vmid.
*/
if (!need_new_vmid_gen(kvm)) {
spin_unlock(&kvm_vmid_lock);
return;
}
/* First user of a new VMID generation? */
if (unlikely(kvm_next_vmid == 0)) {
atomic64_inc(&kvm_vmid_gen);
kvm_next_vmid = 1;
/*
* On SMP we know no other CPUs can use this CPU's or each
* other's VMID after force_vm_exit returns since the
* kvm_vmid_lock blocks them from reentry to the guest.
*/
force_vm_exit(cpu_all_mask);
/*
* Now broadcast TLB + ICACHE invalidation over the inner
* shareable domain to make sure all data structures are
* clean.
*/
kvm_call_hyp(__kvm_flush_vm_context);
}
kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
kvm->arch.vmid = kvm_next_vmid;
kvm_next_vmid++;
/* update vttbr to be used with the new vmid */
pgd_phys = virt_to_phys(kvm_get_hwpgd(kvm));
BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK;
kvm->arch.vttbr = pgd_phys | vmid;
spin_unlock(&kvm_vmid_lock);
}
static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
{
int ret;
if (likely(vcpu->arch.has_run_once))
return 0;
vcpu->arch.has_run_once = true;
/*
* Initialize the VGIC before running a vcpu the first time on
* this VM.
*/
if (unlikely(!vgic_initialized(vcpu->kvm))) {
ret = kvm_vgic_init(vcpu->kvm);
if (ret)
return ret;
}
return 0;
}
static void vcpu_pause(struct kvm_vcpu *vcpu)
{
wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
wait_event_interruptible(*wq, !vcpu->arch.pause);
}
static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
{
return vcpu->arch.target >= 0;
}
/**
* kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
* @vcpu: The VCPU pointer
* @run: The kvm_run structure pointer used for userspace state exchange
*
* This function is called through the VCPU_RUN ioctl called from user space. It
* will execute VM code in a loop until the time slice for the process is used
* or some emulation is needed from user space in which case the function will
* return with return value 0 and with the kvm_run structure filled in with the
* required data for the requested emulation.
*/
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
int ret;
sigset_t sigsaved;
if (unlikely(!kvm_vcpu_initialized(vcpu)))
return -ENOEXEC;
ret = kvm_vcpu_first_run_init(vcpu);
if (ret)
return ret;
if (run->exit_reason == KVM_EXIT_MMIO) {
ret = kvm_handle_mmio_return(vcpu, vcpu->run);
if (ret)
return ret;
}
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
ret = 1;
run->exit_reason = KVM_EXIT_UNKNOWN;
while (ret > 0) {
/*
* Check conditions before entering the guest
*/
cond_resched();
update_vttbr(vcpu->kvm);
if (vcpu->arch.pause)
vcpu_pause(vcpu);
kvm_vgic_flush_hwstate(vcpu);
kvm_timer_flush_hwstate(vcpu);
local_irq_disable();
/*
* Re-check atomic conditions
*/
if (signal_pending(current)) {
ret = -EINTR;
run->exit_reason = KVM_EXIT_INTR;
}
if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) {
local_irq_enable();
kvm_timer_sync_hwstate(vcpu);
kvm_vgic_sync_hwstate(vcpu);
continue;
}
/**************************************************************
* Enter the guest
*/
trace_kvm_entry(*vcpu_pc(vcpu));
kvm_guest_enter();
vcpu->mode = IN_GUEST_MODE;
ret = kvm_call_hyp(__kvm_vcpu_run, vcpu);
vcpu->mode = OUTSIDE_GUEST_MODE;
vcpu->arch.last_pcpu = smp_processor_id();
kvm_guest_exit();
trace_kvm_exit(*vcpu_pc(vcpu));
/*
* We may have taken a host interrupt in HYP mode (ie
* while executing the guest). This interrupt is still
* pending, as we haven't serviced it yet!
*
* We're now back in SVC mode, with interrupts
* disabled. Enabling the interrupts now will have
* the effect of taking the interrupt again, in SVC
* mode this time.
*/
local_irq_enable();
/*
* Back from guest
*************************************************************/
kvm_timer_sync_hwstate(vcpu);
kvm_vgic_sync_hwstate(vcpu);
ret = handle_exit(vcpu, run, ret);
}
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
return ret;
}
static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
{
int bit_index;
bool set;
unsigned long *ptr;
if (number == KVM_ARM_IRQ_CPU_IRQ)
bit_index = __ffs(HCR_VI);
else /* KVM_ARM_IRQ_CPU_FIQ */
bit_index = __ffs(HCR_VF);
ptr = (unsigned long *)&vcpu->arch.irq_lines;
if (level)
set = test_and_set_bit(bit_index, ptr);
else
set = test_and_clear_bit(bit_index, ptr);
/*
* If we didn't change anything, no need to wake up or kick other CPUs
*/
if (set == level)
return 0;
/*
* The vcpu irq_lines field was updated, wake up sleeping VCPUs and
* trigger a world-switch round on the running physical CPU to set the
* virtual IRQ/FIQ fields in the HCR appropriately.
*/
kvm_vcpu_kick(vcpu);
return 0;
}
int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
bool line_status)
{
u32 irq = irq_level->irq;
unsigned int irq_type, vcpu_idx, irq_num;
int nrcpus = atomic_read(&kvm->online_vcpus);
struct kvm_vcpu *vcpu = NULL;
bool level = irq_level->level;
irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
switch (irq_type) {
case KVM_ARM_IRQ_TYPE_CPU:
if (irqchip_in_kernel(kvm))
return -ENXIO;
if (vcpu_idx >= nrcpus)
return -EINVAL;
vcpu = kvm_get_vcpu(kvm, vcpu_idx);
if (!vcpu)
return -EINVAL;
if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
return -EINVAL;
return vcpu_interrupt_line(vcpu, irq_num, level);
case KVM_ARM_IRQ_TYPE_PPI:
if (!irqchip_in_kernel(kvm))
return -ENXIO;
if (vcpu_idx >= nrcpus)
return -EINVAL;
vcpu = kvm_get_vcpu(kvm, vcpu_idx);
if (!vcpu)
return -EINVAL;
if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
return -EINVAL;
return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level);
case KVM_ARM_IRQ_TYPE_SPI:
if (!irqchip_in_kernel(kvm))
return -ENXIO;
if (irq_num < VGIC_NR_PRIVATE_IRQS ||
irq_num > KVM_ARM_IRQ_GIC_MAX)
return -EINVAL;
return kvm_vgic_inject_irq(kvm, 0, irq_num, level);
}
return -EINVAL;
}
static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
struct kvm_vcpu_init *init)
{
int ret;
ret = kvm_vcpu_set_target(vcpu, init);
if (ret)
return ret;
/*
* Handle the "start in power-off" case by marking the VCPU as paused.
*/
if (__test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
vcpu->arch.pause = true;
return 0;
}
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm_vcpu *vcpu = filp->private_data;
void __user *argp = (void __user *)arg;
switch (ioctl) {
case KVM_ARM_VCPU_INIT: {
struct kvm_vcpu_init init;
if (copy_from_user(&init, argp, sizeof(init)))
return -EFAULT;
return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
}
case KVM_SET_ONE_REG:
case KVM_GET_ONE_REG: {
struct kvm_one_reg reg;
if (unlikely(!kvm_vcpu_initialized(vcpu)))
return -ENOEXEC;
if (copy_from_user(&reg, argp, sizeof(reg)))
return -EFAULT;
if (ioctl == KVM_SET_ONE_REG)
return kvm_arm_set_reg(vcpu, &reg);
else
return kvm_arm_get_reg(vcpu, &reg);
}
case KVM_GET_REG_LIST: {
struct kvm_reg_list __user *user_list = argp;
struct kvm_reg_list reg_list;
unsigned n;
if (unlikely(!kvm_vcpu_initialized(vcpu)))
return -ENOEXEC;
if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
return -EFAULT;
n = reg_list.n;
reg_list.n = kvm_arm_num_regs(vcpu);
if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
return -EFAULT;
if (n < reg_list.n)
return -E2BIG;
return kvm_arm_copy_reg_indices(vcpu, user_list->reg);
}
default:
return -EINVAL;
}
}
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
return -EINVAL;
}
static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
struct kvm_arm_device_addr *dev_addr)
{
unsigned long dev_id, type;
dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
KVM_ARM_DEVICE_ID_SHIFT;
type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
KVM_ARM_DEVICE_TYPE_SHIFT;
switch (dev_id) {
case KVM_ARM_DEVICE_VGIC_V2:
if (!vgic_present)
return -ENXIO;
return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
default:
return -ENODEV;
}
}
long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm *kvm = filp->private_data;
void __user *argp = (void __user *)arg;
switch (ioctl) {
case KVM_CREATE_IRQCHIP: {
if (vgic_present)
return kvm_vgic_create(kvm);
else
return -ENXIO;
}
case KVM_ARM_SET_DEVICE_ADDR: {
struct kvm_arm_device_addr dev_addr;
if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
return -EFAULT;
return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
}
case KVM_ARM_PREFERRED_TARGET: {
int err;
struct kvm_vcpu_init init;
err = kvm_vcpu_preferred_target(&init);
if (err)
return err;
if (copy_to_user(argp, &init, sizeof(init)))
return -EFAULT;
return 0;
}
default:
return -EINVAL;
}
}
static void cpu_init_hyp_mode(void *dummy)
{
phys_addr_t boot_pgd_ptr;
phys_addr_t pgd_ptr;
unsigned long hyp_stack_ptr;
unsigned long stack_page;
unsigned long vector_ptr;
/* Switch from the HYP stub to our own HYP init vector */
__hyp_set_vectors(kvm_get_idmap_vector());
boot_pgd_ptr = kvm_mmu_get_boot_httbr();
pgd_ptr = kvm_mmu_get_httbr();
stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
hyp_stack_ptr = stack_page + PAGE_SIZE;
vector_ptr = (unsigned long)__kvm_hyp_vector;
__cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr);
}
static int hyp_init_cpu_notify(struct notifier_block *self,
unsigned long action, void *cpu)
{
switch (action) {
case CPU_STARTING:
case CPU_STARTING_FROZEN:
if (__hyp_get_vectors() == hyp_default_vectors)
cpu_init_hyp_mode(NULL);
break;
}
return NOTIFY_OK;
}
static struct notifier_block hyp_init_cpu_nb = {
.notifier_call = hyp_init_cpu_notify,
};
#ifdef CONFIG_CPU_PM
static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
unsigned long cmd,
void *v)
{
if (cmd == CPU_PM_EXIT &&
__hyp_get_vectors() == hyp_default_vectors) {
cpu_init_hyp_mode(NULL);
return NOTIFY_OK;
}
return NOTIFY_DONE;
}
static struct notifier_block hyp_init_cpu_pm_nb = {
.notifier_call = hyp_init_cpu_pm_notifier,
};
static void __init hyp_cpu_pm_init(void)
{
cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
}
#else
static inline void hyp_cpu_pm_init(void)
{
}
#endif
/**
* Inits Hyp-mode on all online CPUs
*/
static int init_hyp_mode(void)
{
int cpu;
int err = 0;
/*
* Allocate Hyp PGD and setup Hyp identity mapping
*/
err = kvm_mmu_init();
if (err)
goto out_err;
/*
* It is probably enough to obtain the default on one
* CPU. It's unlikely to be different on the others.
*/
hyp_default_vectors = __hyp_get_vectors();
/*
* Allocate stack pages for Hypervisor-mode
*/
for_each_possible_cpu(cpu) {
unsigned long stack_page;
stack_page = __get_free_page(GFP_KERNEL);
if (!stack_page) {
err = -ENOMEM;
goto out_free_stack_pages;
}
per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
}
/*
* Map the Hyp-code called directly from the host
*/
err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end);
if (err) {
kvm_err("Cannot map world-switch code\n");
goto out_free_mappings;
}
/*
* Map the Hyp stack pages
*/
for_each_possible_cpu(cpu) {
char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE);
if (err) {
kvm_err("Cannot map hyp stack\n");
goto out_free_mappings;
}
}
/*
* Map the host CPU structures
*/
kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t);
if (!kvm_host_cpu_state) {
err = -ENOMEM;
kvm_err("Cannot allocate host CPU state\n");
goto out_free_mappings;
}
for_each_possible_cpu(cpu) {
kvm_cpu_context_t *cpu_ctxt;
cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu);
err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1);
if (err) {
kvm_err("Cannot map host CPU state: %d\n", err);
goto out_free_context;
}
}
/*
* Execute the init code on each CPU.
*/
on_each_cpu(cpu_init_hyp_mode, NULL, 1);
/*
* Init HYP view of VGIC
*/
err = kvm_vgic_hyp_init();
if (err)
goto out_free_context;
#ifdef CONFIG_KVM_ARM_VGIC
vgic_present = true;
#endif
/*
* Init HYP architected timer support
*/
err = kvm_timer_hyp_init();
if (err)
goto out_free_mappings;
#ifndef CONFIG_HOTPLUG_CPU
free_boot_hyp_pgd();
#endif
kvm_perf_init();
kvm_info("Hyp mode initialized successfully\n");
return 0;
out_free_context:
free_percpu(kvm_host_cpu_state);
out_free_mappings:
free_hyp_pgds();
out_free_stack_pages:
for_each_possible_cpu(cpu)
free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
out_err:
kvm_err("error initializing Hyp mode: %d\n", err);
return err;
}
static void check_kvm_target_cpu(void *ret)
{
*(int *)ret = kvm_target_cpu();
}
/**
* Initialize Hyp-mode and memory mappings on all CPUs.
*/
int kvm_arch_init(void *opaque)
{
int err;
int ret, cpu;
if (!is_hyp_mode_available()) {
kvm_err("HYP mode not available\n");
return -ENODEV;
}
for_each_online_cpu(cpu) {
smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
if (ret < 0) {
kvm_err("Error, CPU %d not supported!\n", cpu);
return -ENODEV;
}
}
cpu_notifier_register_begin();
err = init_hyp_mode();
if (err)
goto out_err;
err = __register_cpu_notifier(&hyp_init_cpu_nb);
if (err) {
kvm_err("Cannot register HYP init CPU notifier (%d)\n", err);
goto out_err;
}
cpu_notifier_register_done();
hyp_cpu_pm_init();
kvm_coproc_table_init();
return 0;
out_err:
cpu_notifier_register_done();
return err;
}
/* NOP: Compiling as a module not supported */
void kvm_arch_exit(void)
{
kvm_perf_teardown();
}
static int arm_init(void)
{
int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
return rc;
}
module_init(arm_init);