lkml.org 
[lkml]   [2007]   [Sep]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
FromAvi Kivity <>
Subject[PATCH 069/104] KVM: Protect in-kernel pio using kvm->lock
DateMon, 17 Sep 2007 10:31:51 +0200
From: Eddie Dong <eddie.dong@intel.com>

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@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---
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;
--
1.5.3
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-09-17 10:49    [from the cache]
©2003-2010