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OpenCloudOS-Kernel
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Merge branch 'kvm-updates/2.6.33' of git://git.kernel.org/pub/scm/virt/kvm/kvm 

* 'kvm-updates/2.6.33' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: x86: Fix leak of free lapic date in kvm_arch_vcpu_init()
  KVM: x86: Fix probable memory leak of vcpu->arch.mce_banks
  KVM: S390: fix potential array overrun in intercept handling
  KVM: fix spurious interrupt with irqfd
  eventfd - allow atomic read and waitqueue remove
  KVM: MMU: bail out pagewalk on kvm_read_guest error
  KVM: properly check max PIC pin in irq route setup
  KVM: only allow one gsi per fd
  KVM: x86: Fix host_mapping_level()
  KVM: powerpc: Show timing option only on embedded
  KVM: Fix race between APIC TMR and IRR
This commit is contained in:
Linus Torvalds 2010-01-25 19:02:31 -08:00
parent a8d0b6666e 443c39bc9e
commit 486d35e222
10 changed files with 128 additions and 34 deletions
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2
arch/powerpc/kvm/Kconfig
View File

@ -53,7 +53,7 @@ config KVM_440
config KVM_EXIT_TIMING
bool "Detailed exit timing"
depends on KVM
depends on KVM_440 || KVM_E500
---help---
Calculate elapsed time for every exit/enter cycle. A per-vcpu
report is available in debugfs kvm/vm#_vcpu#_timing.

4
arch/s390/kvm/intercept.c
View File

@ -213,7 +213,7 @@ static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
return rc2;
}
static const intercept_handler_t intercept_funcs[0x48 >> 2] = {
static const intercept_handler_t intercept_funcs[] = {
[0x00 >> 2] = handle_noop,
[0x04 >> 2] = handle_instruction,
[0x08 >> 2] = handle_prog,
@ -230,7 +230,7 @@ int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
intercept_handler_t func;
u8 code = vcpu->arch.sie_block->icptcode;
if (code & 3 || code > 0x48)
if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs))
return -ENOTSUPP;
func = intercept_funcs[code >> 2];
if (func)

11
arch/x86/kvm/lapic.c
View File

@ -373,6 +373,12 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
if (unlikely(!apic_enabled(apic)))
break;
if (trig_mode) {
apic_debug("level trig mode for vector %d", vector);
apic_set_vector(vector, apic->regs + APIC_TMR);
} else
apic_clear_vector(vector, apic->regs + APIC_TMR);
result = !apic_test_and_set_irr(vector, apic);
trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
trig_mode, vector, !result);
@ -383,11 +389,6 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
break;
}
if (trig_mode) {
apic_debug("level trig mode for vector %d", vector);
apic_set_vector(vector, apic->regs + APIC_TMR);
} else
apic_clear_vector(vector, apic->regs + APIC_TMR);
kvm_vcpu_kick(vcpu);
break;

6
arch/x86/kvm/mmu.c
View File

@ -477,7 +477,7 @@ static int host_mapping_level(struct kvm *kvm, gfn_t gfn)
addr = gfn_to_hva(kvm, gfn);
if (kvm_is_error_hva(addr))
return page_size;
return PT_PAGE_TABLE_LEVEL;
down_read(&current->mm->mmap_sem);
vma = find_vma(current->mm, addr);
@ -515,11 +515,9 @@ static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn)
if (host_level == PT_PAGE_TABLE_LEVEL)
return host_level;
for (level = PT_DIRECTORY_LEVEL; level <= host_level; ++level) {
for (level = PT_DIRECTORY_LEVEL; level <= host_level; ++level)
if (has_wrprotected_page(vcpu->kvm, large_gfn, level))
break;
}
return level - 1;
}

4
arch/x86/kvm/paging_tmpl.h
View File

@ -150,7 +150,9 @@ walk:
walker->table_gfn[walker->level - 1] = table_gfn;
walker->pte_gpa[walker->level - 1] = pte_gpa;
kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte));
if (kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte)))
goto not_present;
trace_kvm_mmu_paging_element(pte, walker->level);
if (!is_present_gpte(pte))

6
arch/x86/kvm/x86.c
View File

@ -5072,12 +5072,13 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
GFP_KERNEL);
if (!vcpu->arch.mce_banks) {
r = -ENOMEM;
goto fail_mmu_destroy;
goto fail_free_lapic;
}
vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
return 0;
fail_free_lapic:
kvm_free_lapic(vcpu);
fail_mmu_destroy:
kvm_mmu_destroy(vcpu);
fail_free_pio_data:
@ -5088,6 +5089,7 @@ fail:
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
kfree(vcpu->arch.mce_banks);
kvm_free_lapic(vcpu);
down_read(&vcpu->kvm->slots_lock);
kvm_mmu_destroy(vcpu);

89
fs/eventfd.c
View File

@ -135,26 +135,71 @@ static unsigned int eventfd_poll(struct file *file, poll_table *wait)
return events;
}
static ssize_t eventfd_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
static void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt)
{
*cnt = (ctx->flags & EFD_SEMAPHORE) ? 1 : ctx->count;
ctx->count -= *cnt;
}
/**
* eventfd_ctx_remove_wait_queue - Read the current counter and removes wait queue.
* @ctx: [in] Pointer to eventfd context.
* @wait: [in] Wait queue to be removed.
* @cnt: [out] Pointer to the 64bit conter value.
*
* Returns zero if successful, or the following error codes:
*
* -EAGAIN : The operation would have blocked.
*
* This is used to atomically remove a wait queue entry from the eventfd wait
* queue head, and read/reset the counter value.
*/
int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_t *wait,
__u64 *cnt)
{
unsigned long flags;
spin_lock_irqsave(&ctx->wqh.lock, flags);
eventfd_ctx_do_read(ctx, cnt);
__remove_wait_queue(&ctx->wqh, wait);
if (*cnt != 0 && waitqueue_active(&ctx->wqh))
wake_up_locked_poll(&ctx->wqh, POLLOUT);
spin_unlock_irqrestore(&ctx->wqh.lock, flags);
return *cnt != 0 ? 0 : -EAGAIN;
}
EXPORT_SYMBOL_GPL(eventfd_ctx_remove_wait_queue);
/**
* eventfd_ctx_read - Reads the eventfd counter or wait if it is zero.
* @ctx: [in] Pointer to eventfd context.
* @no_wait: [in] Different from zero if the operation should not block.
* @cnt: [out] Pointer to the 64bit conter value.
*
* Returns zero if successful, or the following error codes:
*
* -EAGAIN : The operation would have blocked but @no_wait was nonzero.
* -ERESTARTSYS : A signal interrupted the wait operation.
*
* If @no_wait is zero, the function might sleep until the eventfd internal
* counter becomes greater than zero.
*/
ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait, __u64 *cnt)
{
struct eventfd_ctx *ctx = file->private_data;
ssize_t res;
__u64 ucnt = 0;
DECLARE_WAITQUEUE(wait, current);
if (count < sizeof(ucnt))
return -EINVAL;
spin_lock_irq(&ctx->wqh.lock);
*cnt = 0;
res = -EAGAIN;
if (ctx->count > 0)
res = sizeof(ucnt);
else if (!(file->f_flags & O_NONBLOCK)) {
res = 0;
else if (!no_wait) {
__add_wait_queue(&ctx->wqh, &wait);
for (res = 0;;) {
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (ctx->count > 0) {
res = sizeof(ucnt);
res = 0;
break;
}
if (signal_pending(current)) {
@ -168,18 +213,32 @@ static ssize_t eventfd_read(struct file *file, char __user *buf, size_t count,
__remove_wait_queue(&ctx->wqh, &wait);
__set_current_state(TASK_RUNNING);
}
if (likely(res > 0)) {
ucnt = (ctx->flags & EFD_SEMAPHORE) ? 1 : ctx->count;
ctx->count -= ucnt;
if (likely(res == 0)) {
eventfd_ctx_do_read(ctx, cnt);
if (waitqueue_active(&ctx->wqh))
wake_up_locked_poll(&ctx->wqh, POLLOUT);
}
spin_unlock_irq(&ctx->wqh.lock);
if (res > 0 && put_user(ucnt, (__u64 __user *) buf))
return -EFAULT;
return res;
}
EXPORT_SYMBOL_GPL(eventfd_ctx_read);
static ssize_t eventfd_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
struct eventfd_ctx *ctx = file->private_data;
ssize_t res;
__u64 cnt;
if (count < sizeof(cnt))
return -EINVAL;
res = eventfd_ctx_read(ctx, file->f_flags & O_NONBLOCK, &cnt);
if (res < 0)
return res;
return put_user(cnt, (__u64 __user *) buf) ? -EFAULT : sizeof(cnt);
}
static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t count,
loff_t *ppos)

16
include/linux/eventfd.h
View File

@ -10,6 +10,7 @@
#include <linux/fcntl.h>
#include <linux/file.h>
#include <linux/wait.h>
/*
* CAREFUL: Check include/asm-generic/fcntl.h when defining
@ -34,6 +35,9 @@ struct file *eventfd_fget(int fd);
struct eventfd_ctx *eventfd_ctx_fdget(int fd);
struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
int eventfd_signal(struct eventfd_ctx *ctx, int n);
ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait, __u64 *cnt);
int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_t *wait,
__u64 *cnt);
#else /* CONFIG_EVENTFD */
@ -61,6 +65,18 @@ static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
}
static inline ssize_t eventfd_ctx_read(struct eventfd_ctx *ctx, int no_wait,
__u64 *cnt)
{
return -ENOSYS;
}
static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,
wait_queue_t *wait, __u64 *cnt)
{
return -ENOSYS;
}
#endif
#endif /* _LINUX_EVENTFD_H */

18
virt/kvm/eventfd.c
View File

@ -72,12 +72,13 @@ static void
irqfd_shutdown(struct work_struct *work)
{
struct _irqfd *irqfd = container_of(work, struct _irqfd, shutdown);
u64 cnt;
/*
* Synchronize with the wait-queue and unhook ourselves to prevent
* further events.
*/
remove_wait_queue(irqfd->wqh, &irqfd->wait);
eventfd_ctx_remove_wait_queue(irqfd->eventfd, &irqfd->wait, &cnt);
/*
* We know no new events will be scheduled at this point, so block
@ -166,7 +167,7 @@ irqfd_ptable_queue_proc(struct file *file, wait_queue_head_t *wqh,
static int
kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi)
{
struct _irqfd *irqfd;
struct _irqfd *irqfd, *tmp;
struct file *file = NULL;
struct eventfd_ctx *eventfd = NULL;
int ret;
@ -203,9 +204,20 @@ kvm_irqfd_assign(struct kvm *kvm, int fd, int gsi)
init_waitqueue_func_entry(&irqfd->wait, irqfd_wakeup);
init_poll_funcptr(&irqfd->pt, irqfd_ptable_queue_proc);
spin_lock_irq(&kvm->irqfds.lock);
ret = 0;
list_for_each_entry(tmp, &kvm->irqfds.items, list) {
if (irqfd->eventfd != tmp->eventfd)
continue;
/* This fd is used for another irq already. */
ret = -EBUSY;
spin_unlock_irq(&kvm->irqfds.lock);
goto fail;
}
events = file->f_op->poll(file, &irqfd->pt);
spin_lock_irq(&kvm->irqfds.lock);
list_add_tail(&irqfd->list, &kvm->irqfds.items);
spin_unlock_irq(&kvm->irqfds.lock);

6
virt/kvm/irq_comm.c
View File

@ -302,6 +302,7 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt,
{
int r = -EINVAL;
int delta;
unsigned max_pin;
struct kvm_kernel_irq_routing_entry *ei;
struct hlist_node *n;
@ -322,12 +323,15 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt,
switch (ue->u.irqchip.irqchip) {
case KVM_IRQCHIP_PIC_MASTER:
e->set = kvm_set_pic_irq;
max_pin = 16;
break;
case KVM_IRQCHIP_PIC_SLAVE:
e->set = kvm_set_pic_irq;
max_pin = 16;
delta = 8;
break;
case KVM_IRQCHIP_IOAPIC:
max_pin = KVM_IOAPIC_NUM_PINS;
e->set = kvm_set_ioapic_irq;
break;
default:
@ -335,7 +339,7 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt,
}
e->irqchip.irqchip = ue->u.irqchip.irqchip;
e->irqchip.pin = ue->u.irqchip.pin + delta;
if (e->irqchip.pin >= KVM_IOAPIC_NUM_PINS)
if (e->irqchip.pin >= max_pin)
goto out;
rt->chip[ue->u.irqchip.irqchip][e->irqchip.pin] = ue->gsi;
break;