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xen-pciback: notify hypervisor about devices intended to be assigned to guests 

For MSI-X capable devices the hypervisor wants to write protect the
MSI-X table and PBA, yet it can't assume that resources have been
assigned to their final values at device enumeration time. Thus have
pciback do that notification, as having the device controlled by it is
a prerequisite to assigning the device to guests anyway.

This is the kernel part of hypervisor side commit 4245d33 ("x86/MSI:
add mechanism to fully protect MSI-X table from PV guest accesses") on
the master branch of git://xenbits.xen.org/xen.git.

CC: stable@vger.kernel.org
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Jan Beulich 2013-03-12 15:06:23 +00:00 committed by Konrad Rzeszutek Wilk
parent 949dd8c14f
commit 909b3fdb0d
4 changed files with 54 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/include/asm/xen/hypercall.h
View File

@ -382,14 +382,14 @@ HYPERVISOR_console_io(int cmd, int count, char *str)
return _hypercall3(int, console_io, cmd, count, str);
}
extern int __must_check HYPERVISOR_physdev_op_compat(int, void *);
extern int __must_check xen_physdev_op_compat(int, void *);
static inline int
HYPERVISOR_physdev_op(int cmd, void *arg)
{
int rc = _hypercall2(int, physdev_op, cmd, arg);
if (unlikely(rc == -ENOSYS))
rc = HYPERVISOR_physdev_op_compat(cmd, arg);
rc = xen_physdev_op_compat(cmd, arg);
return rc;
}

3
drivers/xen/fallback.c
View File

@ -44,7 +44,7 @@ int xen_event_channel_op_compat(int cmd, void *arg)
}
EXPORT_SYMBOL_GPL(xen_event_channel_op_compat);
int HYPERVISOR_physdev_op_compat(int cmd, void *arg)
int xen_physdev_op_compat(int cmd, void *arg)
{
struct physdev_op op;
int rc;
@ -78,3 +78,4 @@ int HYPERVISOR_physdev_op_compat(int cmd, void *arg)
return rc;
}
EXPORT_SYMBOL_GPL(xen_physdev_op_compat);

59
drivers/xen/xen-pciback/pci_stub.c
View File

@ -17,6 +17,7 @@
#include <xen/events.h>
#include <asm/xen/pci.h>
#include <asm/xen/hypervisor.h>
#include <xen/interface/physdev.h>
#include "pciback.h"
#include "conf_space.h"
#include "conf_space_quirks.h"
@ -85,37 +86,52 @@ static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
static void pcistub_device_release(struct kref *kref)
{
struct pcistub_device *psdev;
struct pci_dev *dev;
struct xen_pcibk_dev_data *dev_data;
psdev = container_of(kref, struct pcistub_device, kref);
dev_data = pci_get_drvdata(psdev->dev);
dev = psdev->dev;
dev_data = pci_get_drvdata(dev);
dev_dbg(&psdev->dev->dev, "pcistub_device_release\n");
dev_dbg(&dev->dev, "pcistub_device_release\n");
xen_unregister_device_domain_owner(psdev->dev);
xen_unregister_device_domain_owner(dev);
/* Call the reset function which does not take lock as this
* is called from "unbind" which takes a device_lock mutex.
*/
__pci_reset_function_locked(psdev->dev);
if (pci_load_and_free_saved_state(psdev->dev,
&dev_data->pci_saved_state)) {
dev_dbg(&psdev->dev->dev, "Could not reload PCI state\n");
} else
pci_restore_state(psdev->dev);
__pci_reset_function_locked(dev);
if (pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state))
dev_dbg(&dev->dev, "Could not reload PCI state\n");
else
pci_restore_state(dev);
if (pci_find_capability(dev, PCI_CAP_ID_MSIX)) {
struct physdev_pci_device ppdev = {
.seg = pci_domain_nr(dev->bus),
.bus = dev->bus->number,
.devfn = dev->devfn
};
int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix,
&ppdev);
if (err)
dev_warn(&dev->dev, "MSI-X release failed (%d)\n",
err);
}
/* Disable the device */
xen_pcibk_reset_device(psdev->dev);
xen_pcibk_reset_device(dev);
kfree(dev_data);
pci_set_drvdata(psdev->dev, NULL);
pci_set_drvdata(dev, NULL);
/* Clean-up the device */
xen_pcibk_config_free_dyn_fields(psdev->dev);
xen_pcibk_config_free_dev(psdev->dev);
xen_pcibk_config_free_dyn_fields(dev);
xen_pcibk_config_free_dev(dev);
psdev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
pci_dev_put(psdev->dev);
dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
pci_dev_put(dev);
kfree(psdev);
}
@ -355,6 +371,19 @@ static int pcistub_init_device(struct pci_dev *dev)
if (err)
goto config_release;
if (pci_find_capability(dev, PCI_CAP_ID_MSIX)) {
struct physdev_pci_device ppdev = {
.seg = pci_domain_nr(dev->bus),
.bus = dev->bus->number,
.devfn = dev->devfn
};
err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev);
if (err)
dev_err(&dev->dev, "MSI-X preparation failed (%d)\n",
err);
}
/* We need the device active to save the state. */
dev_dbg(&dev->dev, "save state of device\n");
pci_save_state(dev);

6
include/xen/interface/physdev.h
View File

@ -251,6 +251,12 @@ struct physdev_pci_device_add {
#define PHYSDEVOP_pci_device_remove 26
#define PHYSDEVOP_restore_msi_ext 27
/*
* Dom0 should use these two to announce MMIO resources assigned to
* MSI-X capable devices won't (prepare) or may (release) change.
*/
#define PHYSDEVOP_prepare_msix 30
#define PHYSDEVOP_release_msix 31
struct physdev_pci_device {
/* IN */
uint16_t seg;