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KVM: Portability: Add vcpu and hardware management arch hooks 

Add the following hooks:

  void decache_vcpus_on_cpu(int cpu);
  int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
  void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
  void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
  void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
  void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
  struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
  void kvm_arch_vcpu_destory(struct kvm_vcpu *vcpu);
  int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
  void kvm_arch_hardware_enable(void *garbage);
  void kvm_arch_hardware_disable(void *garbage);
  int kvm_arch_hardware_setup(void);
  void kvm_arch_hardware_unsetup(void);
  void kvm_arch_check_processor_compat(void *rtn);

Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Zhang Xiantao 2007-11-14 20:38:21 +08:00 committed by Avi Kivity
parent 97896d04a1
commit e9b11c1755
4 changed files with 197 additions and 95 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/kvm/kvm.h
View File

@ -492,6 +492,8 @@ void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);
void vcpu_load(struct kvm_vcpu *vcpu);
void vcpu_put(struct kvm_vcpu *vcpu);
void decache_vcpus_on_cpu(int cpu);
int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
struct module *module);
@ -649,6 +651,23 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
__init void kvm_arch_init(void);
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
void kvm_arch_vcpu_destory(struct kvm_vcpu *vcpu);
int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
void kvm_arch_hardware_enable(void *garbage);
void kvm_arch_hardware_disable(void *garbage);
int kvm_arch_hardware_setup(void);
void kvm_arch_hardware_unsetup(void);
void kvm_arch_check_processor_compat(void *rtn);
static inline void kvm_guest_enter(void)
{
account_system_vtime(current);

113
drivers/kvm/kvm_main.c
View File

@ -50,8 +50,8 @@
MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");
static DEFINE_SPINLOCK(kvm_lock);
static LIST_HEAD(vm_list);
DEFINE_SPINLOCK(kvm_lock);
LIST_HEAD(vm_list);
static cpumask_t cpus_hardware_enabled;
@ -124,13 +124,8 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
mutex_init(&vcpu->mutex);
vcpu->cpu = -1;
vcpu->mmu.root_hpa = INVALID_PAGE;
vcpu->kvm = kvm;
vcpu->vcpu_id = id;
if (!irqchip_in_kernel(kvm) || id == 0)
vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
else
vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
init_waitqueue_head(&vcpu->wq);
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
@ -140,29 +135,11 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
}
vcpu->run = page_address(page);
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page) {
r = -ENOMEM;
goto fail_free_run;
}
vcpu->pio_data = page_address(page);
r = kvm_mmu_create(vcpu);
r = kvm_arch_vcpu_init(vcpu);
if (r < 0)
goto fail_free_pio_data;
if (irqchip_in_kernel(kvm)) {
r = kvm_create_lapic(vcpu);
if (r < 0)
goto fail_mmu_destroy;
}
goto fail_free_run;
return 0;
fail_mmu_destroy:
kvm_mmu_destroy(vcpu);
fail_free_pio_data:
free_page((unsigned long)vcpu->pio_data);
fail_free_run:
free_page((unsigned long)vcpu->run);
fail:
@ -172,9 +149,7 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_init);
void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
{
kvm_free_lapic(vcpu);
kvm_mmu_destroy(vcpu);
free_page((unsigned long)vcpu->pio_data);
kvm_arch_vcpu_uninit(vcpu);
free_page((unsigned long)vcpu->run);
}
EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
@ -240,7 +215,7 @@ static void kvm_free_vcpus(struct kvm *kvm)
kvm_unload_vcpu_mmu(kvm->vcpus[i]);
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
if (kvm->vcpus[i]) {
kvm_x86_ops->vcpu_free(kvm->vcpus[i]);
kvm_arch_vcpu_free(kvm->vcpus[i]);
kvm->vcpus[i] = NULL;
}
}
@ -900,28 +875,17 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
if (!valid_vcpu(n))
return -EINVAL;
vcpu = kvm_x86_ops->vcpu_create(kvm, n);
vcpu = kvm_arch_vcpu_create(kvm, n);
if (IS_ERR(vcpu))
return PTR_ERR(vcpu);
preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
/* We do fxsave: this must be aligned. */
BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
vcpu_load(vcpu);
r = kvm_x86_ops->vcpu_reset(vcpu);
if (r == 0)
r = kvm_mmu_setup(vcpu);
vcpu_put(vcpu);
if (r < 0)
goto free_vcpu;
mutex_lock(&kvm->lock);
if (kvm->vcpus[n]) {
r = -EEXIST;
mutex_unlock(&kvm->lock);
goto mmu_unload;
goto vcpu_destroy;
}
kvm->vcpus[n] = vcpu;
mutex_unlock(&kvm->lock);
@ -936,14 +900,8 @@ unlink:
mutex_lock(&kvm->lock);
kvm->vcpus[n] = NULL;
mutex_unlock(&kvm->lock);
mmu_unload:
vcpu_load(vcpu);
kvm_mmu_unload(vcpu);
vcpu_put(vcpu);
free_vcpu:
kvm_x86_ops->vcpu_free(vcpu);
vcpu_destroy:
kvm_arch_vcpu_destory(vcpu);
return r;
}
@ -1281,41 +1239,6 @@ static struct miscdevice kvm_dev = {
&kvm_chardev_ops,
};
/*
* Make sure that a cpu that is being hot-unplugged does not have any vcpus
* cached on it.
*/
static void decache_vcpus_on_cpu(int cpu)
{
struct kvm *vm;
struct kvm_vcpu *vcpu;
int i;
spin_lock(&kvm_lock);
list_for_each_entry(vm, &vm_list, vm_list)
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
vcpu = vm->vcpus[i];
if (!vcpu)
continue;
/*
* If the vcpu is locked, then it is running on some
* other cpu and therefore it is not cached on the
* cpu in question.
*
* If it's not locked, check the last cpu it executed
* on.
*/
if (mutex_trylock(&vcpu->mutex)) {
if (vcpu->cpu == cpu) {
kvm_x86_ops->vcpu_decache(vcpu);
vcpu->cpu = -1;
}
mutex_unlock(&vcpu->mutex);
}
}
spin_unlock(&kvm_lock);
}
static void hardware_enable(void *junk)
{
int cpu = raw_smp_processor_id();
@ -1323,7 +1246,7 @@ static void hardware_enable(void *junk)
if (cpu_isset(cpu, cpus_hardware_enabled))
return;
cpu_set(cpu, cpus_hardware_enabled);
kvm_x86_ops->hardware_enable(NULL);
kvm_arch_hardware_enable(NULL);
}
static void hardware_disable(void *junk)
@ -1334,7 +1257,7 @@ static void hardware_disable(void *junk)
return;
cpu_clear(cpu, cpus_hardware_enabled);
decache_vcpus_on_cpu(cpu);
kvm_x86_ops->hardware_disable(NULL);
kvm_arch_hardware_disable(NULL);
}
static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
@ -1500,7 +1423,7 @@ static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
{
struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
kvm_x86_ops->vcpu_load(vcpu, cpu);
kvm_arch_vcpu_load(vcpu, cpu);
}
static void kvm_sched_out(struct preempt_notifier *pn,
@ -1508,7 +1431,7 @@ static void kvm_sched_out(struct preempt_notifier *pn,
{
struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
kvm_x86_ops->vcpu_put(vcpu);
kvm_arch_vcpu_put(vcpu);
}
int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
@ -1533,13 +1456,13 @@ int kvm_init_x86(struct kvm_x86_ops *ops, unsigned int vcpu_size,
kvm_x86_ops = ops;
r = kvm_x86_ops->hardware_setup();
r = kvm_arch_hardware_setup();
if (r < 0)
goto out;
for_each_online_cpu(cpu) {
smp_call_function_single(cpu,
kvm_x86_ops->check_processor_compatibility,
kvm_arch_check_processor_compat,
&r, 0, 1);
if (r < 0)
goto out_free_0;
@ -1594,7 +1517,7 @@ out_free_2:
out_free_1:
on_each_cpu(hardware_disable, NULL, 0, 1);
out_free_0:
kvm_x86_ops->hardware_unsetup();
kvm_arch_hardware_unsetup();
out:
kvm_x86_ops = NULL;
return r;
@ -1610,7 +1533,7 @@ void kvm_exit_x86(void)
unregister_reboot_notifier(&kvm_reboot_notifier);
unregister_cpu_notifier(&kvm_cpu_notifier);
on_each_cpu(hardware_disable, NULL, 0, 1);
kvm_x86_ops->hardware_unsetup();
kvm_arch_hardware_unsetup();
kvm_x86_ops = NULL;
}
EXPORT_SYMBOL_GPL(kvm_exit_x86);

157
drivers/kvm/x86.c
View File

@ -564,6 +564,41 @@ out:
return r;
}
/*
* Make sure that a cpu that is being hot-unplugged does not have any vcpus
* cached on it.
*/
void decache_vcpus_on_cpu(int cpu)
{
struct kvm *vm;
struct kvm_vcpu *vcpu;
int i;
spin_lock(&kvm_lock);
list_for_each_entry(vm, &vm_list, vm_list)
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
vcpu = vm->vcpus[i];
if (!vcpu)
continue;
/*
* If the vcpu is locked, then it is running on some
* other cpu and therefore it is not cached on the
* cpu in question.
*
* If it's not locked, check the last cpu it executed
* on.
*/
if (mutex_trylock(&vcpu->mutex)) {
if (vcpu->cpu == cpu) {
kvm_x86_ops->vcpu_decache(vcpu);
vcpu->cpu = -1;
}
mutex_unlock(&vcpu->mutex);
}
}
spin_unlock(&kvm_lock);
}
long kvm_arch_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@ -2319,3 +2354,125 @@ void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
fx_restore(&vcpu->host_fx_image);
}
EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
{
kvm_x86_ops->vcpu_free(vcpu);
}
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
unsigned int id)
{
int r;
struct kvm_vcpu *vcpu = kvm_x86_ops->vcpu_create(kvm, id);
if (IS_ERR(vcpu)) {
r = -ENOMEM;
goto fail;
}
/* We do fxsave: this must be aligned. */
BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
vcpu_load(vcpu);
r = kvm_arch_vcpu_reset(vcpu);
if (r == 0)
r = kvm_mmu_setup(vcpu);
vcpu_put(vcpu);
if (r < 0)
goto free_vcpu;
return vcpu;
free_vcpu:
kvm_x86_ops->vcpu_free(vcpu);
fail:
return ERR_PTR(r);
}
void kvm_arch_vcpu_destory(struct kvm_vcpu *vcpu)
{
vcpu_load(vcpu);
kvm_mmu_unload(vcpu);
vcpu_put(vcpu);
kvm_x86_ops->vcpu_free(vcpu);
}
int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
{
return kvm_x86_ops->vcpu_reset(vcpu);
}
void kvm_arch_hardware_enable(void *garbage)
{
kvm_x86_ops->hardware_enable(garbage);
}
void kvm_arch_hardware_disable(void *garbage)
{
kvm_x86_ops->hardware_disable(garbage);
}
int kvm_arch_hardware_setup(void)
{
return kvm_x86_ops->hardware_setup();
}
void kvm_arch_hardware_unsetup(void)
{
kvm_x86_ops->hardware_unsetup();
}
void kvm_arch_check_processor_compat(void *rtn)
{
kvm_x86_ops->check_processor_compatibility(rtn);
}
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
struct page *page;
struct kvm *kvm;
int r;
BUG_ON(vcpu->kvm == NULL);
kvm = vcpu->kvm;
vcpu->mmu.root_hpa = INVALID_PAGE;
if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
else
vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page) {
r = -ENOMEM;
goto fail;
}
vcpu->pio_data = page_address(page);
r = kvm_mmu_create(vcpu);
if (r < 0)
goto fail_free_pio_data;
if (irqchip_in_kernel(kvm)) {
r = kvm_create_lapic(vcpu);
if (r < 0)
goto fail_mmu_destroy;
}
return 0;
fail_mmu_destroy:
kvm_mmu_destroy(vcpu);
fail_free_pio_data:
free_page((unsigned long)vcpu->pio_data);
fail:
return r;
}
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
kvm_free_lapic(vcpu);
kvm_mmu_destroy(vcpu);
free_page((unsigned long)vcpu->pio_data);
}

3
drivers/kvm/x86.h
View File

@ -19,6 +19,9 @@
#include <linux/kvm.h>
#include <linux/kvm_para.h>
extern spinlock_t kvm_lock;
extern struct list_head vm_list;
struct kvm_vcpu {
KVM_VCPU_COMM;
u64 host_tsc;