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Commit 9cf98828 authored by Eddie Dong's avatar Eddie Dong Committed by Avi Kivity
Browse files

KVM: Protect in-kernel pio using kvm->lock 



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

Signed-off-by: default avatarYaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent b6958ce4

drivers/kvm/kvm_main.c

+6 −0
Original line number Diff line number Diff line
@@ -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;