1.1 --- a/linux-2.6-xen-sparse/drivers/xen/pciback/conf_space.c	Fri Jul 28 12:54:58 2006 +0100
     1.2 +++ b/linux-2.6-xen-sparse/drivers/xen/pciback/conf_space.c	Fri Jul 28 12:56:10 2006 +0100
     1.3 @@ -15,9 +15,6 @@
     1.4  #include "conf_space.h"
     1.5  #include "conf_space_quirks.h"
     1.6  
     1.7 -static int permissive = 0;
     1.8 -module_param(permissive, bool, 0644);
     1.9 -
    1.10  #define DEFINE_PCI_CONFIG(op,size,type) 			\
    1.11  int pciback_##op##_config_##size 				\
    1.12  (struct pci_dev *dev, int offset, type value, void *data)	\
    1.13 @@ -258,7 +255,7 @@ int pciback_config_write(struct pci_dev 
    1.14  		 * This means that some fields may still be read-only because
    1.15  		 * they have entries in the config_field list that intercept
    1.16  		 * the write and do nothing. */
    1.17 -		if (permissive) {
    1.18 +		if (dev_data->permissive) {
    1.19  			switch (size) {
    1.20  			case 1:
    1.21  				err = pci_write_config_byte(dev, offset,

     2.1 --- a/linux-2.6-xen-sparse/drivers/xen/pciback/pci_stub.c	Fri Jul 28 12:54:58 2006 +0100
     2.2 +++ b/linux-2.6-xen-sparse/drivers/xen/pciback/pci_stub.c	Fri Jul 28 12:56:10 2006 +0100
     2.3 @@ -739,6 +739,72 @@ static ssize_t pcistub_quirk_show(struct
     2.4  
     2.5  DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show, pcistub_quirk_add);
     2.6  
     2.7 +static ssize_t permissive_add(struct device_driver *drv, const char *buf,
     2.8 +			      size_t count)
     2.9 +{
    2.10 +	int domain, bus, slot, func;
    2.11 +	int err;
    2.12 +	struct pcistub_device *psdev;
    2.13 +	struct pciback_dev_data *dev_data;
    2.14 +	err = str_to_slot(buf, &domain, &bus, &slot, &func);
    2.15 +	if (err)
    2.16 +		goto out;
    2.17 +	psdev = pcistub_device_find(domain, bus, slot, func);
    2.18 +	if (!psdev) {
    2.19 +		err = -ENODEV;
    2.20 +		goto out;
    2.21 +	}
    2.22 +	if (!psdev->dev) {
    2.23 +		err = -ENODEV;
    2.24 +		goto release;
    2.25 +	}
    2.26 +	dev_data = pci_get_drvdata(psdev->dev);
    2.27 +	/* the driver data for a device should never be null at this point */
    2.28 +	if (!dev_data) {
    2.29 +		err = -ENXIO;
    2.30 +		goto release;
    2.31 +	}
    2.32 +	if (!dev_data->permissive) {
    2.33 +		dev_data->permissive = 1;
    2.34 +		/* Let user know that what they're doing could be unsafe */
    2.35 +		dev_warn(&psdev->dev->dev,
    2.36 +			 "enabling permissive mode configuration space accesses!\n");
    2.37 +		dev_warn(&psdev->dev->dev,
    2.38 +			 "permissive mode is potentially unsafe!\n");
    2.39 +	}
    2.40 +      release:
    2.41 +	pcistub_device_put(psdev);
    2.42 +      out:
    2.43 +	if (!err)
    2.44 +		err = count;
    2.45 +	return err;
    2.46 +}
    2.47 +
    2.48 +static ssize_t permissive_show(struct device_driver *drv, char *buf)
    2.49 +{
    2.50 +	struct pcistub_device *psdev;
    2.51 +	struct pciback_dev_data *dev_data;
    2.52 +	size_t count = 0;
    2.53 +	unsigned long flags;
    2.54 +	spin_lock_irqsave(&pcistub_devices_lock, flags);
    2.55 +	list_for_each_entry(psdev, &pcistub_devices, dev_list) {
    2.56 +		if (count >= PAGE_SIZE)
    2.57 +			break;
    2.58 +		if (!psdev->dev)
    2.59 +			continue;
    2.60 +		dev_data = pci_get_drvdata(psdev->dev);
    2.61 +		if (!dev_data || !dev_data->permissive)
    2.62 +			continue;
    2.63 +		count +=
    2.64 +		    scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
    2.65 +			      pci_name(psdev->dev));
    2.66 +	}
    2.67 +	spin_unlock_irqrestore(&pcistub_devices_lock, flags);
    2.68 +	return count;
    2.69 +}
    2.70 +
    2.71 +DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show, permissive_add);
    2.72 +
    2.73  static int __init pcistub_init(void)
    2.74  {
    2.75  	int pos = 0;
    2.76 @@ -784,6 +850,7 @@ static int __init pcistub_init(void)
    2.77  			   &driver_attr_remove_slot);
    2.78  	driver_create_file(&pciback_pci_driver.driver, &driver_attr_slots);
    2.79  	driver_create_file(&pciback_pci_driver.driver, &driver_attr_quirks);
    2.80 +	driver_create_file(&pciback_pci_driver.driver, &driver_attr_permissive);
    2.81  
    2.82        out:
    2.83  	return err;
    2.84 @@ -834,6 +901,7 @@ static void __exit pciback_cleanup(void)
    2.85  			   &driver_attr_remove_slot);
    2.86  	driver_remove_file(&pciback_pci_driver.driver, &driver_attr_slots);
    2.87  	driver_remove_file(&pciback_pci_driver.driver, &driver_attr_quirks);
    2.88 +	driver_remove_file(&pciback_pci_driver.driver, &driver_attr_permissive);
    2.89  
    2.90  	pci_unregister_driver(&pciback_pci_driver);
    2.91  }

     3.1 --- a/linux-2.6-xen-sparse/drivers/xen/pciback/pciback.h	Fri Jul 28 12:54:58 2006 +0100
     3.2 +++ b/linux-2.6-xen-sparse/drivers/xen/pciback/pciback.h	Fri Jul 28 12:56:10 2006 +0100
     3.3 @@ -44,6 +44,7 @@ struct pciback_device {
     3.4  
     3.5  struct pciback_dev_data {
     3.6  	struct list_head config_fields;
     3.7 +	int permissive;
     3.8  	int warned_on_write;
     3.9  };
    3.10