[PATCH 069/104] KVM: Protect in-kernel pio using kvm->lock

Avi Kivity
2007-09-17T08:31:51Z

From: Eddie Dong <eddie.dong-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

pio operation and IRQ_LINE kvm_vm_ioctl is not kvm->lock
protected. Add lock to same with IOAPIC MMIO operations.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
---
drivers/kvm/kvm_main.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 4384364..5063b3a 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1790,6 +1790,7 @@ static void kernel_pio(struct kvm_io_device *pio_dev,
{
/* TODO: String I/O for in kernel device */

+ mutex_lock(&vcpu->kvm->lock);
if (vcpu->pio.in)
kvm_iodevice_read(pio_dev, vcpu->pio.port,
vcpu->pio.size,
@@ -1798,6 +1799,7 @@ static void kernel_pio(struct kvm_io_device *pio_dev,
kvm_iodevice_write(pio_dev, vcpu->pio.port,
vcpu->pio.size,
pd);
+ mutex_unlock(&vcpu->kvm->lock);
}

static void pio_string_write(struct kvm_io_device *pio_dev,
@@ -1807,12 +1809,14 @@ static void pio_string_write(struct kvm_io_device *pio_dev,
void *pd = vcpu->pio_data;
int i;

+ mutex_lock(&vcpu->kvm->lock);
for (i = 0; i < io->cur_count; i++) {
kvm_iodevice_write(pio_dev, io->port,
io->size,
pd);
pd += io->size;
}
+ mutex_unlock(&vcpu->kvm->lock);
}

int kvm_emulate_pio (struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
@@ -2818,6 +2822,7 @@ static long kvm_vm_ioctl(struct file *filp,
if (copy_from_user(&irq_event, argp, sizeof irq_event))
goto out;
if (irqchip_in_kernel(kvm)) {
+ mutex_lock(&kvm->lock);
if (irq_event.irq < 16)
kvm_pic_set_irq(pic_irqchip(kvm),
irq_event.irq,
@@ -2825,6 +2830,7 @@ static long kvm_vm_ioctl(struct file *filp,
kvm_ioapic_set_irq(kvm->vioapic,
irq_event.irq,
irq_event.level);
+ mutex_unlock(&kvm->lock);
r = 0;
}
break;