vfio/pci: Rename vfio_pci.c to vfio_pci_core.c

This is a preparation patch for separating the vfio_pci driver to a
subsystem driver and a generic pci driver. This patch doesn't change any
logic.

Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20210826103912.128972-2-yishaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

1 files changed, 0 insertions, 2320 deletions

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
deleted file mode 100644
index a4f44ea52fa3..000000000000
--- a/drivers/vfio/pci/vfio_pci.c
+++ /dev/null
@@ -1,2320 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
- *     Author: Alex Williamson <alex.williamson@redhat.com>
- *
- * Derived from original vfio:
- * Copyright 2010 Cisco Systems, Inc.  All rights reserved.
- * Author: Tom Lyon, pugs@cisco.com
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/device.h>
-#include <linux/eventfd.h>
-#include <linux/file.h>
-#include <linux/interrupt.h>
-#include <linux/iommu.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/notifier.h>
-#include <linux/pci.h>
-#include <linux/pm_runtime.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <linux/uaccess.h>
-#include <linux/vfio.h>
-#include <linux/vgaarb.h>
-#include <linux/nospec.h>
-#include <linux/sched/mm.h>
-
-#include "vfio_pci_private.h"
-
-#define DRIVER_VERSION  "0.2"
-#define DRIVER_AUTHOR   "Alex Williamson <alex.williamson@redhat.com>"
-#define DRIVER_DESC     "VFIO PCI - User Level meta-driver"
-
-static char ids[1024] __initdata;
-module_param_string(ids, ids, sizeof(ids), 0);
-MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified");
-
-static bool nointxmask;
-module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(nointxmask,
-		  "Disable support for PCI 2.3 style INTx masking.  If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag.");
-
-#ifdef CONFIG_VFIO_PCI_VGA
-static bool disable_vga;
-module_param(disable_vga, bool, S_IRUGO);
-MODULE_PARM_DESC(disable_vga, "Disable VGA resource access through vfio-pci");
-#endif
-
-static bool disable_idle_d3;
-module_param(disable_idle_d3, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(disable_idle_d3,
-		 "Disable using the PCI D3 low power state for idle, unused devices");
-
-static bool enable_sriov;
-#ifdef CONFIG_PCI_IOV
-module_param(enable_sriov, bool, 0644);
-MODULE_PARM_DESC(enable_sriov, "Enable support for SR-IOV configuration.  Enabling SR-IOV on a PF typically requires support of the userspace PF driver, enabling VFs without such support may result in non-functional VFs or PF.");
-#endif
-
-static bool disable_denylist;
-module_param(disable_denylist, bool, 0444);
-MODULE_PARM_DESC(disable_denylist, "Disable use of device denylist. Disabling the denylist allows binding to devices with known errata that may lead to exploitable stability or security issues when accessed by untrusted users.");
-
-static inline bool vfio_vga_disabled(void)
-{
-#ifdef CONFIG_VFIO_PCI_VGA
-	return disable_vga;
-#else
-	return true;
-#endif
-}
-
-static bool vfio_pci_dev_in_denylist(struct pci_dev *pdev)
-{
-	switch (pdev->vendor) {
-	case PCI_VENDOR_ID_INTEL:
-		switch (pdev->device) {
-		case PCI_DEVICE_ID_INTEL_QAT_C3XXX:
-		case PCI_DEVICE_ID_INTEL_QAT_C3XXX_VF:
-		case PCI_DEVICE_ID_INTEL_QAT_C62X:
-		case PCI_DEVICE_ID_INTEL_QAT_C62X_VF:
-		case PCI_DEVICE_ID_INTEL_QAT_DH895XCC:
-		case PCI_DEVICE_ID_INTEL_QAT_DH895XCC_VF:
-			return true;
-		default:
-			return false;
-		}
-	}
-
-	return false;
-}
-
-static bool vfio_pci_is_denylisted(struct pci_dev *pdev)
-{
-	if (!vfio_pci_dev_in_denylist(pdev))
-		return false;
-
-	if (disable_denylist) {
-		pci_warn(pdev,
-			 "device denylist disabled - allowing device %04x:%04x.\n",
-			 pdev->vendor, pdev->device);
-		return false;
-	}
-
-	pci_warn(pdev, "%04x:%04x exists in vfio-pci device denylist, driver probing disallowed.\n",
-		 pdev->vendor, pdev->device);
-
-	return true;
-}
-
-/*
- * Our VGA arbiter participation is limited since we don't know anything
- * about the device itself.  However, if the device is the only VGA device
- * downstream of a bridge and VFIO VGA support is disabled, then we can
- * safely return legacy VGA IO and memory as not decoded since the user
- * has no way to get to it and routing can be disabled externally at the
- * bridge.
- */
-static unsigned int vfio_pci_set_vga_decode(void *opaque, bool single_vga)
-{
-	struct vfio_pci_device *vdev = opaque;
-	struct pci_dev *tmp = NULL, *pdev = vdev->pdev;
-	unsigned char max_busnr;
-	unsigned int decodes;
-
-	if (single_vga || !vfio_vga_disabled() || pci_is_root_bus(pdev->bus))
-		return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
-		       VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
-
-	max_busnr = pci_bus_max_busnr(pdev->bus);
-	decodes = VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
-
-	while ((tmp = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, tmp)) != NULL) {
-		if (tmp == pdev ||
-		    pci_domain_nr(tmp->bus) != pci_domain_nr(pdev->bus) ||
-		    pci_is_root_bus(tmp->bus))
-			continue;
-
-		if (tmp->bus->number >= pdev->bus->number &&
-		    tmp->bus->number <= max_busnr) {
-			pci_dev_put(tmp);
-			decodes |= VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM;
-			break;
-		}
-	}
-
-	return decodes;
-}
-
-static inline bool vfio_pci_is_vga(struct pci_dev *pdev)
-{
-	return (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
-}
-
-static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
-{
-	struct resource *res;
-	int i;
-	struct vfio_pci_dummy_resource *dummy_res;
-
-	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
-		int bar = i + PCI_STD_RESOURCES;
-
-		res = &vdev->pdev->resource[bar];
-
-		if (!IS_ENABLED(CONFIG_VFIO_PCI_MMAP))
-			goto no_mmap;
-
-		if (!(res->flags & IORESOURCE_MEM))
-			goto no_mmap;
-
-		/*
-		 * The PCI core shouldn't set up a resource with a
-		 * type but zero size. But there may be bugs that
-		 * cause us to do that.
-		 */
-		if (!resource_size(res))
-			goto no_mmap;
-
-		if (resource_size(res) >= PAGE_SIZE) {
-			vdev->bar_mmap_supported[bar] = true;
-			continue;
-		}
-
-		if (!(res->start & ~PAGE_MASK)) {
-			/*
-			 * Add a dummy resource to reserve the remainder
-			 * of the exclusive page in case that hot-add
-			 * device's bar is assigned into it.
-			 */
-			dummy_res = kzalloc(sizeof(*dummy_res), GFP_KERNEL);
-			if (dummy_res == NULL)
-				goto no_mmap;
-
-			dummy_res->resource.name = "vfio sub-page reserved";
-			dummy_res->resource.start = res->end + 1;
-			dummy_res->resource.end = res->start + PAGE_SIZE - 1;
-			dummy_res->resource.flags = res->flags;
-			if (request_resource(res->parent,
-						&dummy_res->resource)) {
-				kfree(dummy_res);
-				goto no_mmap;
-			}
-			dummy_res->index = bar;
-			list_add(&dummy_res->res_next,
-					&vdev->dummy_resources_list);
-			vdev->bar_mmap_supported[bar] = true;
-			continue;
-		}
-		/*
-		 * Here we don't handle the case when the BAR is not page
-		 * aligned because we can't expect the BAR will be
-		 * assigned into the same location in a page in guest
-		 * when we passthrough the BAR. And it's hard to access
-		 * this BAR in userspace because we have no way to get
-		 * the BAR's location in a page.
-		 */
-no_mmap:
-		vdev->bar_mmap_supported[bar] = false;
-	}
-}
-
-struct vfio_pci_group_info;
-static bool vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set);
-static void vfio_pci_disable(struct vfio_pci_device *vdev);
-static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
-				      struct vfio_pci_group_info *groups);
-
-/*
- * INTx masking requires the ability to disable INTx signaling via PCI_COMMAND
- * _and_ the ability detect when the device is asserting INTx via PCI_STATUS.
- * If a device implements the former but not the latter we would typically
- * expect broken_intx_masking be set and require an exclusive interrupt.
- * However since we do have control of the device's ability to assert INTx,
- * we can instead pretend that the device does not implement INTx, virtualizing
- * the pin register to report zero and maintaining DisINTx set on the host.
- */
-static bool vfio_pci_nointx(struct pci_dev *pdev)
-{
-	switch (pdev->vendor) {
-	case PCI_VENDOR_ID_INTEL:
-		switch (pdev->device) {
-		/* All i40e (XL710/X710/XXV710) 10/20/25/40GbE NICs */
-		case 0x1572:
-		case 0x1574:
-		case 0x1580 ... 0x1581:
-		case 0x1583 ... 0x158b:
-		case 0x37d0 ... 0x37d2:
-		/* X550 */
-		case 0x1563:
-			return true;
-		default:
-			return false;
-		}
-	}
-
-	return false;
-}
-
-static void vfio_pci_probe_power_state(struct vfio_pci_device *vdev)
-{
-	struct pci_dev *pdev = vdev->pdev;
-	u16 pmcsr;
-
-	if (!pdev->pm_cap)
-		return;
-
-	pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &pmcsr);
-
-	vdev->needs_pm_restore = !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET);
-}
-
-/*
- * pci_set_power_state() wrapper handling devices which perform a soft reset on
- * D3->D0 transition.  Save state prior to D0/1/2->D3, stash it on the vdev,
- * restore when returned to D0.  Saved separately from pci_saved_state for use
- * by PM capability emulation and separately from pci_dev internal saved state
- * to avoid it being overwritten and consumed around other resets.
- */
-int vfio_pci_set_power_state(struct vfio_pci_device *vdev, pci_power_t state)
-{
-	struct pci_dev *pdev = vdev->pdev;
-	bool needs_restore = false, needs_save = false;
-	int ret;
-
-	if (vdev->needs_pm_restore) {
-		if (pdev->current_state < PCI_D3hot && state >= PCI_D3hot) {
-			pci_save_state(pdev);
-			needs_save = true;
-		}
-
-		if (pdev->current_state >= PCI_D3hot && state <= PCI_D0)
-			needs_restore = true;
-	}
-
-	ret = pci_set_power_state(pdev, state);
-
-	if (!ret) {
-		/* D3 might be unsupported via quirk, skip unless in D3 */
-		if (needs_save && pdev->current_state >= PCI_D3hot) {
-			vdev->pm_save = pci_store_saved_state(pdev);
-		} else if (needs_restore) {
-			pci_load_and_free_saved_state(pdev, &vdev->pm_save);
-			pci_restore_state(pdev);
-		}
-	}
-
-	return ret;
-}
-
-static int vfio_pci_enable(struct vfio_pci_device *vdev)
-{
-	struct pci_dev *pdev = vdev->pdev;
-	int ret;
-	u16 cmd;
-	u8 msix_pos;
-
-	vfio_pci_set_power_state(vdev, PCI_D0);
-
-	/* Don't allow our initial saved state to include busmaster */
-	pci_clear_master(pdev);
-
-	ret = pci_enable_device(pdev);
-	if (ret)
-		return ret;
-
-	/* If reset fails because of the device lock, fail this path entirely */
-	ret = pci_try_reset_function(pdev);
-	if (ret == -EAGAIN) {
-		pci_disable_device(pdev);
-		return ret;
-	}
-
-	vdev->reset_works = !ret;
-	pci_save_state(pdev);
-	vdev->pci_saved_state = pci_store_saved_state(pdev);
-	if (!vdev->pci_saved_state)
-		pci_dbg(pdev, "%s: Couldn't store saved state\n", __func__);
-
-	if (likely(!nointxmask)) {
-		if (vfio_pci_nointx(pdev)) {
-			pci_info(pdev, "Masking broken INTx support\n");
-			vdev->nointx = true;
-			pci_intx(pdev, 0);
-		} else
-			vdev->pci_2_3 = pci_intx_mask_supported(pdev);
-	}
-
-	pci_read_config_word(pdev, PCI_COMMAND, &cmd);
-	if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
-		cmd &= ~PCI_COMMAND_INTX_DISABLE;
-		pci_write_config_word(pdev, PCI_COMMAND, cmd);
-	}
-
-	ret = vfio_config_init(vdev);
-	if (ret) {
-		kfree(vdev->pci_saved_state);
-		vdev->pci_saved_state = NULL;
-		pci_disable_device(pdev);
-		return ret;
-	}
-
-	msix_pos = pdev->msix_cap;
-	if (msix_pos) {
-		u16 flags;
-		u32 table;
-
-		pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
-		pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
-
-		vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
-		vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
-		vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
-	} else
-		vdev->msix_bar = 0xFF;
-
-	if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev))
-		vdev->has_vga = true;
-
-	if (vfio_pci_is_vga(pdev) &&
-	    pdev->vendor == PCI_VENDOR_ID_INTEL &&
-	    IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
-		ret = vfio_pci_igd_init(vdev);
-		if (ret && ret != -ENODEV) {
-			pci_warn(pdev, "Failed to setup Intel IGD regions\n");
-			goto disable_exit;
-		}
-	}
-
-	vfio_pci_probe_mmaps(vdev);
-
-	return 0;
-
-disable_exit:
-	vfio_pci_disable(vdev);
-	return ret;
-}
-
-static void vfio_pci_disable(struct vfio_pci_device *vdev)
-{
-	struct pci_dev *pdev = vdev->pdev;
-	struct vfio_pci_dummy_resource *dummy_res, *tmp;
-	struct vfio_pci_ioeventfd *ioeventfd, *ioeventfd_tmp;
-	int i, bar;
-
-	/* For needs_reset */
-	lockdep_assert_held(&vdev->vdev.dev_set->lock);
-
-	/* Stop the device from further DMA */
-	pci_clear_master(pdev);
-
-	vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
-				VFIO_IRQ_SET_ACTION_TRIGGER,
-				vdev->irq_type, 0, 0, NULL);
-
-	/* Device closed, don't need mutex here */
-	list_for_each_entry_safe(ioeventfd, ioeventfd_tmp,
-				 &vdev->ioeventfds_list, next) {
-		vfio_virqfd_disable(&ioeventfd->virqfd);
-		list_del(&ioeventfd->next);
-		kfree(ioeventfd);
-	}
-	vdev->ioeventfds_nr = 0;
-
-	vdev->virq_disabled = false;
-
-	for (i = 0; i < vdev->num_regions; i++)
-		vdev->region[i].ops->release(vdev, &vdev->region[i]);
-
-	vdev->num_regions = 0;
-	kfree(vdev->region);
-	vdev->region = NULL; /* don't krealloc a freed pointer */
-
-	vfio_config_free(vdev);
-
-	for (i = 0; i < PCI_STD_NUM_BARS; i++) {
-		bar = i + PCI_STD_RESOURCES;
-		if (!vdev->barmap[bar])
-			continue;
-		pci_iounmap(pdev, vdev->barmap[bar]);
-		pci_release_selected_regions(pdev, 1 << bar);
-		vdev->barmap[bar] = NULL;
-	}
-
-	list_for_each_entry_safe(dummy_res, tmp,
-				 &vdev->dummy_resources_list, res_next) {
-		list_del(&dummy_res->res_next);
-		release_resource(&dummy_res->resource);
-		kfree(dummy_res);
-	}
-
-	vdev->needs_reset = true;
-
-	/*
-	 * If we have saved state, restore it.  If we can reset the device,
-	 * even better.  Resetting with current state seems better than
-	 * nothing, but saving and restoring current state without reset
-	 * is just busy work.
-	 */
-	if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
-		pci_info(pdev, "%s: Couldn't reload saved state\n", __func__);
-
-		if (!vdev->reset_works)
-			goto out;
-
-		pci_save_state(pdev);
-	}
-
-	/*
-	 * Disable INTx and MSI, presumably to avoid spurious interrupts
-	 * during reset.  Stolen from pci_reset_function()
-	 */
-	pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
-
-	/*
-	 * Try to get the locks ourselves to prevent a deadlock. The
-	 * success of this is dependent on being able to lock the device,
-	 * which is not always possible.
-	 * We can not use the "try" reset interface here, which will
-	 * overwrite the previously restored configuration information.
-	 */
-	if (vdev->reset_works && pci_dev_trylock(pdev)) {
-		if (!__pci_reset_function_locked(pdev))
-			vdev->needs_reset = false;
-		pci_dev_unlock(pdev);
-	}
-
-	pci_restore_state(pdev);
-out:
-	pci_disable_device(pdev);
-
-	if (!vfio_pci_dev_set_try_reset(vdev->vdev.dev_set) && !disable_idle_d3)
-		vfio_pci_set_power_state(vdev, PCI_D3hot);
-}
-
-static struct pci_driver vfio_pci_driver;
-
-static struct vfio_pci_device *get_pf_vdev(struct vfio_pci_device *vdev)
-{
-	struct pci_dev *physfn = pci_physfn(vdev->pdev);
-	struct vfio_device *pf_dev;
-
-	if (!vdev->pdev->is_virtfn)
-		return NULL;
-
-	pf_dev = vfio_device_get_from_dev(&physfn->dev);
-	if (!pf_dev)
-		return NULL;
-
-	if (pci_dev_driver(physfn) != &vfio_pci_driver) {
-		vfio_device_put(pf_dev);
-		return NULL;
-	}
-
-	return container_of(pf_dev, struct vfio_pci_device, vdev);
-}
-
-static void vfio_pci_vf_token_user_add(struct vfio_pci_device *vdev, int val)
-{
-	struct vfio_pci_device *pf_vdev = get_pf_vdev(vdev);
-
-	if (!pf_vdev)
-		return;
-
-	mutex_lock(&pf_vdev->vf_token->lock);
-	pf_vdev->vf_token->users += val;
-	WARN_ON(pf_vdev->vf_token->users < 0);
-	mutex_unlock(&pf_vdev->vf_token->lock);
-
-	vfio_device_put(&pf_vdev->vdev);
-}
-
-static void vfio_pci_close_device(struct vfio_device *core_vdev)
-{
-	struct vfio_pci_device *vdev =
-		container_of(core_vdev, struct vfio_pci_device, vdev);
-
-	vfio_pci_vf_token_user_add(vdev, -1);
-	vfio_spapr_pci_eeh_release(vdev->pdev);
-	vfio_pci_disable(vdev);
-
-	mutex_lock(&vdev->igate);
-	if (vdev->err_trigger) {
-		eventfd_ctx_put(vdev->err_trigger);
-		vdev->err_trigger = NULL;
-	}
-	if (vdev->req_trigger) {
-		eventfd_ctx_put(vdev->req_trigger);
-		vdev->req_trigger = NULL;
-	}
-	mutex_unlock(&vdev->igate);
-}
-
-static int vfio_pci_open_device(struct vfio_device *core_vdev)
-{
-	struct vfio_pci_device *vdev =
-		container_of(core_vdev, struct vfio_pci_device, vdev);
-	int ret = 0;
-
-	ret = vfio_pci_enable(vdev);
-	if (ret)
-		return ret;
-
-	vfio_spapr_pci_eeh_open(vdev->pdev);
-	vfio_pci_vf_token_user_add(vdev, 1);
-	return 0;
-}
-
-static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
-{
-	if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
-		u8 pin;
-
-		if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) ||
-		    vdev->nointx || vdev->pdev->is_virtfn)
-			return 0;
-
-		pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
-
-		return pin ? 1 : 0;
-	} else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
-		u8 pos;
-		u16 flags;
-
-		pos = vdev->pdev->msi_cap;
-		if (pos) {
-			pci_read_config_word(vdev->pdev,
-					     pos + PCI_MSI_FLAGS, &flags);
-			return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
-		}
-	} else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
-		u8 pos;
-		u16 flags;
-
-		pos = vdev->pdev->msix_cap;
-		if (pos) {
-			pci_read_config_word(vdev->pdev,
-					     pos + PCI_MSIX_FLAGS, &flags);
-
-			return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
-		}
-	} else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX) {
-		if (pci_is_pcie(vdev->pdev))
-			return 1;
-	} else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
-		return 1;
-	}
-
-	return 0;
-}
-
-static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
-{
-	(*(int *)data)++;
-	return 0;
-}
-
-struct vfio_pci_fill_info {
-	int max;
-	int cur;
-	struct vfio_pci_dependent_device *devices;
-};
-
-static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
-{
-	struct vfio_pci_fill_info *fill = data;
-	struct iommu_group *iommu_group;
-
-	if (fill->cur == fill->max)
-		return -EAGAIN; /* Something changed, try again */
-
-	iommu_group = iommu_group_get(&pdev->dev);
-	if (!iommu_group)
-		return -EPERM; /* Cannot reset non-isolated devices */
-
-	fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
-	fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
-	fill->devices[fill->cur].bus = pdev->bus->number;
-	fill->devices[fill->cur].devfn = pdev->devfn;
-	fill->cur++;
-	iommu_group_put(iommu_group);
-	return 0;
-}
-
-struct vfio_pci_group_info {
-	int count;
-	struct vfio_group **groups;
-};
-
-static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
-{
-	for (; pdev; pdev = pdev->bus->self)
-		if (pdev->bus == slot->bus)
-			return (pdev->slot == slot);
-	return false;
-}
-
-struct vfio_pci_walk_info {
-	int (*fn)(struct pci_dev *, void *data);
-	void *data;
-	struct pci_dev *pdev;
-	bool slot;
-	int ret;
-};
-
-static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
-{
-	struct vfio_pci_walk_info *walk = data;
-
-	if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
-		walk->ret = walk->fn(pdev, walk->data);
-
-	return walk->ret;
-}
-
-static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
-					 int (*fn)(struct pci_dev *,
-						   void *data), void *data,
-					 bool slot)
-{
-	struct vfio_pci_walk_info walk = {
-		.fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
-	};
-
-	pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
-
-	return walk.ret;
-}
-
-static int msix_mmappable_cap(struct vfio_pci_device *vdev,
-			      struct vfio_info_cap *caps)
-{
-	struct vfio_info_cap_header header = {
-		.id = VFIO_REGION_INFO_CAP_MSIX_MAPPABLE,
-		.version = 1
-	};
-
-	return vfio_info_add_capability(caps, &header, sizeof(header));
-}
-
-int vfio_pci_register_dev_region(struct vfio_pci_device *vdev,
-				 unsigned int type, unsigned int subtype,
-				 const struct vfio_pci_regops *ops,
-				 size_t size, u32 flags, void *data)
-{
-	struct vfio_pci_region *region;
-
-	region = krealloc(vdev->region,
-			  (vdev->num_regions + 1) * sizeof(*region),
-			  GFP_KERNEL);
-	if (!region)
-		return -ENOMEM;
-
-	vdev->region = region;
-	vdev->region[vdev->num_regions].type = type;
-	vdev->region[vdev->num_regions].subtype = subtype;
-	vdev->region[vdev->num_regions].ops = ops;
-	vdev->region[vdev->num_regions].size = size;
-	vdev->region[vdev->num_regions].flags = flags;
-	vdev->region[vdev->num_regions].data = data;
-
-	vdev->num_regions++;
-
-	return 0;
-}
-
-static long vfio_pci_ioctl(struct vfio_device *core_vdev,
-			   unsigned int cmd, unsigned long arg)
-{
-	struct vfio_pci_device *vdev =
-		container_of(core_vdev, struct vfio_pci_device, vdev);
-	unsigned long minsz;
-
-	if (cmd == VFIO_DEVICE_GET_INFO) {
-		struct vfio_device_info info;
-		struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
-		unsigned long capsz;
-		int ret;
-
-		minsz = offsetofend(struct vfio_device_info, num_irqs);
-
-		/* For backward compatibility, cannot require this */
-		capsz = offsetofend(struct vfio_iommu_type1_info, cap_offset);
-
-		if (copy_from_user(&info, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (info.argsz < minsz)
-			return -EINVAL;
-
-		if (info.argsz >= capsz) {
-			minsz = capsz;
-			info.cap_offset = 0;
-		}
-
-		info.flags = VFIO_DEVICE_FLAGS_PCI;
-
-		if (vdev->reset_works)
-			info.flags |= VFIO_DEVICE_FLAGS_RESET;
-
-		info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions;
-		info.num_irqs = VFIO_PCI_NUM_IRQS;
-
-		ret = vfio_pci_info_zdev_add_caps(vdev, &caps);
-		if (ret && ret != -ENODEV) {
-			pci_warn(vdev->pdev, "Failed to setup zPCI info capabilities\n");
-			return ret;
-		}
-
-		if (caps.size) {
-			info.flags |= VFIO_DEVICE_FLAGS_CAPS;
-			if (info.argsz < sizeof(info) + caps.size) {
-				info.argsz = sizeof(info) + caps.size;
-			} else {
-				vfio_info_cap_shift(&caps, sizeof(info));
-				if (copy_to_user((void __user *)arg +
-						  sizeof(info), caps.buf,
-						  caps.size)) {
-					kfree(caps.buf);
-					return -EFAULT;
-				}
-				info.cap_offset = sizeof(info);
-			}
-
-			kfree(caps.buf);
-		}
-
-		return copy_to_user((void __user *)arg, &info, minsz) ?
-			-EFAULT : 0;
-
-	} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
-		struct pci_dev *pdev = vdev->pdev;
-		struct vfio_region_info info;
-		struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
-		int i, ret;
-
-		minsz = offsetofend(struct vfio_region_info, offset);
-
-		if (copy_from_user(&info, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (info.argsz < minsz)
-			return -EINVAL;
-
-		switch (info.index) {
-		case VFIO_PCI_CONFIG_REGION_INDEX:
-			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
-			info.size = pdev->cfg_size;
-			info.flags = VFIO_REGION_INFO_FLAG_READ |
-				     VFIO_REGION_INFO_FLAG_WRITE;
-			break;
-		case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
-			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
-			info.size = pci_resource_len(pdev, info.index);
-			if (!info.size) {
-				info.flags = 0;
-				break;
-			}
-
-			info.flags = VFIO_REGION_INFO_FLAG_READ |
-				     VFIO_REGION_INFO_FLAG_WRITE;
-			if (vdev->bar_mmap_supported[info.index]) {
-				info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
-				if (info.index == vdev->msix_bar) {
-					ret = msix_mmappable_cap(vdev, &caps);
-					if (ret)
-						return ret;
-				}
-			}
-
-			break;
-		case VFIO_PCI_ROM_REGION_INDEX:
-		{
-			void __iomem *io;
-			size_t size;
-			u16 cmd;
-
-			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
-			info.flags = 0;
-
-			/* Report the BAR size, not the ROM size */
-			info.size = pci_resource_len(pdev, info.index);
-			if (!info.size) {
-				/* Shadow ROMs appear as PCI option ROMs */
-				if (pdev->resource[PCI_ROM_RESOURCE].flags &
-							IORESOURCE_ROM_SHADOW)
-					info.size = 0x20000;
-				else
-					break;
-			}
-
-			/*
-			 * Is it really there?  Enable memory decode for
-			 * implicit access in pci_map_rom().
-			 */
-			cmd = vfio_pci_memory_lock_and_enable(vdev);
-			io = pci_map_rom(pdev, &size);
-			if (io) {
-				info.flags = VFIO_REGION_INFO_FLAG_READ;
-				pci_unmap_rom(pdev, io);
-			} else {
-				info.size = 0;
-			}
-			vfio_pci_memory_unlock_and_restore(vdev, cmd);
-
-			break;
-		}
-		case VFIO_PCI_VGA_REGION_INDEX:
-			if (!vdev->has_vga)
-				return -EINVAL;
-
-			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
-			info.size = 0xc0000;
-			info.flags = VFIO_REGION_INFO_FLAG_READ |
-				     VFIO_REGION_INFO_FLAG_WRITE;
-
-			break;
-		default:
-		{
-			struct vfio_region_info_cap_type cap_type = {
-					.header.id = VFIO_REGION_INFO_CAP_TYPE,
-					.header.version = 1 };
-
-			if (info.index >=
-			    VFIO_PCI_NUM_REGIONS + vdev->num_regions)
-				return -EINVAL;
-			info.index = array_index_nospec(info.index,
-							VFIO_PCI_NUM_REGIONS +
-							vdev->num_regions);
-
-			i = info.index - VFIO_PCI_NUM_REGIONS;
-
-			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
-			info.size = vdev->region[i].size;
-			info.flags = vdev->region[i].flags;
-
-			cap_type.type = vdev->region[i].type;
-			cap_type.subtype = vdev->region[i].subtype;
-
-			ret = vfio_info_add_capability(&caps, &cap_type.header,
-						       sizeof(cap_type));
-			if (ret)
-				return ret;
-
-			if (vdev->region[i].ops->add_capability) {
-				ret = vdev->region[i].ops->add_capability(vdev,
-						&vdev->region[i], &caps);
-				if (ret)
-					return ret;
-			}
-		}
-		}
-
-		if (caps.size) {
-			info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
-			if (info.argsz < sizeof(info) + caps.size) {
-				info.argsz = sizeof(info) + caps.size;
-				info.cap_offset = 0;
-			} else {
-				vfio_info_cap_shift(&caps, sizeof(info));
-				if (copy_to_user((void __user *)arg +
-						  sizeof(info), caps.buf,
-						  caps.size)) {
-					kfree(caps.buf);
-					return -EFAULT;
-				}
-				info.cap_offset = sizeof(info);
-			}
-
-			kfree(caps.buf);
-		}
-
-		return copy_to_user((void __user *)arg, &info, minsz) ?
-			-EFAULT : 0;
-
-	} else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
-		struct vfio_irq_info info;
-
-		minsz = offsetofend(struct vfio_irq_info, count);
-
-		if (copy_from_user(&info, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
-			return -EINVAL;
-
-		switch (info.index) {
-		case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
-		case VFIO_PCI_REQ_IRQ_INDEX:
-			break;
-		case VFIO_PCI_ERR_IRQ_INDEX:
-			if (pci_is_pcie(vdev->pdev))
-				break;
-			fallthrough;
-		default:
-			return -EINVAL;
-		}
-
-		info.flags = VFIO_IRQ_INFO_EVENTFD;
-
-		info.count = vfio_pci_get_irq_count(vdev, info.index);
-
-		if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
-			info.flags |= (VFIO_IRQ_INFO_MASKABLE |
-				       VFIO_IRQ_INFO_AUTOMASKED);
-		else
-			info.flags |= VFIO_IRQ_INFO_NORESIZE;
-
-		return copy_to_user((void __user *)arg, &info, minsz) ?
-			-EFAULT : 0;
-
-	} else if (cmd == VFIO_DEVICE_SET_IRQS) {
-		struct vfio_irq_set hdr;
-		u8 *data = NULL;
-		int max, ret = 0;
-		size_t data_size = 0;
-
-		minsz = offsetofend(struct vfio_irq_set, count);
-
-		if (copy_from_user(&hdr, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		max = vfio_pci_get_irq_count(vdev, hdr.index);
-
-		ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
-						 VFIO_PCI_NUM_IRQS, &data_size);
-		if (ret)
-			return ret;
-
-		if (data_size) {
-			data = memdup_user((void __user *)(arg + minsz),
-					    data_size);
-			if (IS_ERR(data))
-				return PTR_ERR(data);
-		}
-
-		mutex_lock(&vdev->igate);
-
-		ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
-					      hdr.start, hdr.count, data);
-
-		mutex_unlock(&vdev->igate);
-		kfree(data);
-
-		return ret;
-
-	} else if (cmd == VFIO_DEVICE_RESET) {
-		int ret;
-
-		if (!vdev->reset_works)
-			return -EINVAL;
-
-		vfio_pci_zap_and_down_write_memory_lock(vdev);
-		ret = pci_try_reset_function(vdev->pdev);
-		up_write(&vdev->memory_lock);
-
-		return ret;
-
-	} else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
-		struct vfio_pci_hot_reset_info hdr;
-		struct vfio_pci_fill_info fill = { 0 };
-		struct vfio_pci_dependent_device *devices = NULL;
-		bool slot = false;
-		int ret = 0;
-
-		minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
-
-		if (copy_from_user(&hdr, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (hdr.argsz < minsz)
-			return -EINVAL;
-
-		hdr.flags = 0;
-
-		/* Can we do a slot or bus reset or neither? */
-		if (!pci_probe_reset_slot(vdev->pdev->slot))
-			slot = true;
-		else if (pci_probe_reset_bus(vdev->pdev->bus))
-			return -ENODEV;
-
-		/* How many devices are affected? */
-		ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
-						    vfio_pci_count_devs,
-						    &fill.max, slot);
-		if (ret)
-			return ret;
-
-		WARN_ON(!fill.max); /* Should always be at least one */
-
-		/*
-		 * If there's enough space, fill it now, otherwise return
-		 * -ENOSPC and the number of devices affected.
-		 */
-		if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
-			ret = -ENOSPC;
-			hdr.count = fill.max;
-			goto reset_info_exit;
-		}
-
-		devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
-		if (!devices)
-			return -ENOMEM;
-
-		fill.devices = devices;
-
-		ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
-						    vfio_pci_fill_devs,
-						    &fill, slot);
-
-		/*
-		 * If a device was removed between counting and filling,
-		 * we may come up short of fill.max.  If a device was
-		 * added, we'll have a return of -EAGAIN above.
-		 */
-		if (!ret)
-			hdr.count = fill.cur;
-
-reset_info_exit:
-		if (copy_to_user((void __user *)arg, &hdr, minsz))
-			ret = -EFAULT;
-
-		if (!ret) {
-			if (copy_to_user((void __user *)(arg + minsz), devices,
-					 hdr.count * sizeof(*devices)))
-				ret = -EFAULT;
-		}
-
-		kfree(devices);
-		return ret;
-
-	} else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
-		struct vfio_pci_hot_reset hdr;
-		int32_t *group_fds;
-		struct vfio_group **groups;
-		struct vfio_pci_group_info info;
-		bool slot = false;
-		int group_idx, count = 0, ret = 0;
-
-		minsz = offsetofend(struct vfio_pci_hot_reset, count);
-
-		if (copy_from_user(&hdr, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (hdr.argsz < minsz || hdr.flags)
-			return -EINVAL;
-
-		/* Can we do a slot or bus reset or neither? */
-		if (!pci_probe_reset_slot(vdev->pdev->slot))
-			slot = true;
-		else if (pci_probe_reset_bus(vdev->pdev->bus))
-			return -ENODEV;
-
-		/*
-		 * We can't let userspace give us an arbitrarily large
-		 * buffer to copy, so verify how many we think there
-		 * could be.  Note groups can have multiple devices so
-		 * one group per device is the max.
-		 */
-		ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
-						    vfio_pci_count_devs,
-						    &count, slot);
-		if (ret)
-			return ret;
-
-		/* Somewhere between 1 and count is OK */
-		if (!hdr.count || hdr.count > count)
-			return -EINVAL;
-
-		group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
-		groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
-		if (!group_fds || !groups) {
-			kfree(group_fds);
-			kfree(groups);
-			return -ENOMEM;
-		}
-
-		if (copy_from_user(group_fds, (void __user *)(arg + minsz),
-				   hdr.count * sizeof(*group_fds))) {
-			kfree(group_fds);
-			kfree(groups);
-			return -EFAULT;
-		}
-
-		/*
-		 * For each group_fd, get the group through the vfio external
-		 * user interface and store the group and iommu ID.  This
-		 * ensures the group is held across the reset.
-		 */
-		for (group_idx = 0; group_idx < hdr.count; group_idx++) {
-			struct vfio_group *group;
-			struct fd f = fdget(group_fds[group_idx]);
-			if (!f.file) {
-				ret = -EBADF;
-				break;
-			}
-
-			group = vfio_group_get_external_user(f.file);
-			fdput(f);
-			if (IS_ERR(group)) {
-				ret = PTR_ERR(group);
-				break;
-			}
-
-			groups[group_idx] = group;
-		}
-
-		kfree(group_fds);
-
-		/* release reference to groups on error */
-		if (ret)
-			goto hot_reset_release;
-
-		info.count = hdr.count;
-		info.groups = groups;
-
-		ret = vfio_pci_dev_set_hot_reset(vdev->vdev.dev_set, &info);
-
-hot_reset_release:
-		for (group_idx--; group_idx >= 0; group_idx--)
-			vfio_group_put_external_user(groups[group_idx]);
-
-		kfree(groups);
-		return ret;
-	} else if (cmd == VFIO_DEVICE_IOEVENTFD) {
-		struct vfio_device_ioeventfd ioeventfd;
-		int count;
-
-		minsz = offsetofend(struct vfio_device_ioeventfd, fd);
-
-		if (copy_from_user(&ioeventfd, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (ioeventfd.argsz < minsz)
-			return -EINVAL;
-
-		if (ioeventfd.flags & ~VFIO_DEVICE_IOEVENTFD_SIZE_MASK)
-			return -EINVAL;
-
-		count = ioeventfd.flags & VFIO_DEVICE_IOEVENTFD_SIZE_MASK;
-
-		if (hweight8(count) != 1 || ioeventfd.fd < -1)
-			return -EINVAL;
-
-		return vfio_pci_ioeventfd(vdev, ioeventfd.offset,
-					  ioeventfd.data, count, ioeventfd.fd);
-	} else if (cmd == VFIO_DEVICE_FEATURE) {
-		struct vfio_device_feature feature;
-		uuid_t uuid;
-
-		minsz = offsetofend(struct vfio_device_feature, flags);
-
-		if (copy_from_user(&feature, (void __user *)arg, minsz))
-			return -EFAULT;
-
-		if (feature.argsz < minsz)
-			return -EINVAL;
-
-		/* Check unknown flags */
-		if (feature.flags & ~(VFIO_DEVICE_FEATURE_MASK |
-				      VFIO_DEVICE_FEATURE_SET |
-				      VFIO_DEVICE_FEATURE_GET |
-				      VFIO_DEVICE_FEATURE_PROBE))
-			return -EINVAL;
-
-		/* GET & SET are mutually exclusive except with PROBE */
-		if (!(feature.flags & VFIO_DEVICE_FEATURE_PROBE) &&
-		    (feature.flags & VFIO_DEVICE_FEATURE_SET) &&
-		    (feature.flags & VFIO_DEVICE_FEATURE_GET))
-			return -EINVAL;
-
-		switch (feature.flags & VFIO_DEVICE_FEATURE_MASK) {
-		case VFIO_DEVICE_FEATURE_PCI_VF_TOKEN:
-			if (!vdev->vf_token)
-				return -ENOTTY;
-
-			/*
-			 * We do not support GET of the VF Token UUID as this
-			 * could expose the token of the previous device user.
-			 */
-			if (feature.flags & VFIO_DEVICE_FEATURE_GET)
-				return -EINVAL;
-
-			if (feature.flags & VFIO_DEVICE_FEATURE_PROBE)
-				return 0;
-
-			/* Don't SET unless told to do so */
-			if (!(feature.flags & VFIO_DEVICE_FEATURE_SET))
-				return -EINVAL;
-
-			if (feature.argsz < minsz + sizeof(uuid))
-				return -EINVAL;
-
-			if (copy_from_user(&uuid, (void __user *)(arg + minsz),
-					   sizeof(uuid)))
-				return -EFAULT;
-
-			mutex_lock(&vdev->vf_token->lock);
-			uuid_copy(&vdev->vf_token->uuid, &uuid);
-			mutex_unlock(&vdev->vf_token->lock);
-
-			return 0;
-		default:
-			return -ENOTTY;
-		}
-	}
-
-	return -ENOTTY;
-}
-
-static ssize_t vfio_pci_rw(struct vfio_pci_device *vdev, char __user *buf,
-			   size_t count, loff_t *ppos, bool iswrite)
-{
-	unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
-
-	if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
-		return -EINVAL;
-
-	switch (index) {
-	case VFIO_PCI_CONFIG_REGION_INDEX:
-		return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
-
-	case VFIO_PCI_ROM_REGION_INDEX:
-		if (iswrite)
-			return -EINVAL;
-		return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
-
-	case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
-		return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
-
-	case VFIO_PCI_VGA_REGION_INDEX:
-		return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
-	default:
-		index -= VFIO_PCI_NUM_REGIONS;
-		return vdev->region[index].ops->rw(vdev, buf,
-						   count, ppos, iswrite);
-	}
-
-	return -EINVAL;
-}
-
-static ssize_t vfio_pci_read(struct vfio_device *core_vdev, char __user *buf,
-			     size_t count, loff_t *ppos)
-{
-	struct vfio_pci_device *vdev =
-		container_of(core_vdev, struct vfio_pci_device, vdev);
-
-	if (!count)
-		return 0;
-
-	return vfio_pci_rw(vdev, buf, count, ppos, false);
-}
-
-static ssize_t vfio_pci_write(struct vfio_device *core_vdev, const char __user *buf,
-			      size_t count, loff_t *ppos)
-{
-	struct vfio_pci_device *vdev =
-		container_of(core_vdev, struct vfio_pci_device, vdev);
-
-	if (!count)
-		return 0;
-
-	return vfio_pci_rw(vdev, (char __user *)buf, count, ppos, true);
-}
-
-/* Return 1 on zap and vma_lock acquired, 0 on contention (only with @try) */
-static int vfio_pci_zap_and_vma_lock(struct vfio_pci_device *vdev, bool try)
-{
-	struct vfio_pci_mmap_vma *mmap_vma, *tmp;
-
-	/*
-	 * Lock ordering:
-	 * vma_lock is nested under mmap_lock for vm_ops callback paths.
-	 * The memory_lock semaphore is used by both code paths calling
-	 * into this function to zap vmas and the vm_ops.fault callback
-	 * to protect the memory enable state of the device.
-	 *
-	 * When zapping vmas we need to maintain the mmap_lock => vma_lock
-	 * ordering, which requires using vma_lock to walk vma_list to
-	 * acquire an mm, then dropping vma_lock to get the mmap_lock and
-	 * reacquiring vma_lock.  This logic is derived from similar
-	 * requirements in uverbs_user_mmap_disassociate().
-	 *
-	 * mmap_lock must always be the top-level lock when it is taken.
-	 * Therefore we can only hold the memory_lock write lock when
-	 * vma_list is empty, as we'd need to take mmap_lock to clear
-	 * entries.  vma_list can only be guaranteed empty when holding
-	 * vma_lock, thus memory_lock is nested under vma_lock.
-	 *
-	 * This enables the vm_ops.fault callback to acquire vma_lock,
-	 * followed by memory_lock read lock, while already holding
-	 * mmap_lock without risk of deadlock.
-	 */
-	while (1) {
-		struct mm_struct *mm = NULL;
-
-		if (try) {
-			if (!mutex_trylock(&vdev->vma_lock))
-				return 0;
-		} else {
-			mutex_lock(&vdev->vma_lock);
-		}
-		while (!list_empty(&vdev->vma_list)) {
-			mmap_vma = list_first_entry(&vdev->vma_list,
-						    struct vfio_pci_mmap_vma,
-						    vma_next);
-			mm = mmap_vma->vma->vm_mm;
-			if (mmget_not_zero(mm))
-				break;
-
-			list_del(&mmap_vma->vma_next);
-			kfree(mmap_vma);
-			mm = NULL;
-		}
-		if (!mm)
-			return 1;
-		mutex_unlock(&vdev->vma_lock);
-
-		if (try) {
-			if (!mmap_read_trylock(mm)) {
-				mmput(mm);
-				return 0;
-			}
-		} else {
-			mmap_read_lock(mm);
-		}
-		if (try) {
-			if (!mutex_trylock(&vdev->vma_lock)) {
-				mmap_read_unlock(mm);
-				mmput(mm);
-				return 0;
-			}
-		} else {
-			mutex_lock(&vdev->vma_lock);
-		}
-		list_for_each_entry_safe(mmap_vma, tmp,
-					 &vdev->vma_list, vma_next) {
-			struct vm_area_struct *vma = mmap_vma->vma;
-
-			if (vma->vm_mm != mm)
-				continue;
-
-			list_del(&mmap_vma->vma_next);
-			kfree(mmap_vma);
-
-			zap_vma_ptes(vma, vma->vm_start,
-				     vma->vm_end - vma->vm_start);
-		}
-		mutex_unlock(&vdev->vma_lock);
-		mmap_read_unlock(mm);
-		mmput(mm);
-	}
-}
-
-void vfio_pci_zap_and_down_write_memory_lock(struct vfio_pci_device *vdev)
-{
-	vfio_pci_zap_and_vma_lock(vdev, false);
-	down_write(&vdev->memory_lock);
-	mutex_unlock(&vdev->vma_lock);
-}
-
-u16 vfio_pci_memory_lock_and_enable(struct vfio_pci_device *vdev)
-{
-	u16 cmd;
-
-	down_write(&vdev->memory_lock);
-	pci_read_config_word(vdev->pdev, PCI_COMMAND, &cmd);
-	if (!(cmd & PCI_COMMAND_MEMORY))
-		pci_write_config_word(vdev->pdev, PCI_COMMAND,
-				      cmd | PCI_COMMAND_MEMORY);
-
-	return cmd;
-}
-
-void vfio_pci_memory_unlock_and_restore(struct vfio_pci_device *vdev, u16 cmd)
-{
-	pci_write_config_word(vdev->pdev, PCI_COMMAND, cmd);
-	up_write(&vdev->memory_lock);
-}
-
-/* Caller holds vma_lock */
-static int __vfio_pci_add_vma(struct vfio_pci_device *vdev,
-			      struct vm_area_struct *vma)
-{
-	struct vfio_pci_mmap_vma *mmap_vma;
-
-	mmap_vma = kmalloc(sizeof(*mmap_vma), GFP_KERNEL);
-	if (!mmap_vma)
-		return -ENOMEM;
-
-	mmap_vma->vma = vma;
-	list_add(&mmap_vma->vma_next, &vdev->vma_list);
-
-	return 0;
-}
-
-/*
- * Zap mmaps on open so that we can fault them in on access and therefore
- * our vma_list only tracks mappings accessed since last zap.
- */
-static void vfio_pci_mmap_open(struct vm_area_struct *vma)
-{
-	zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
-}
-
-static void vfio_pci_mmap_close(struct vm_area_struct *vma)
-{
-	struct vfio_pci_device *vdev = vma->vm_private_data;
-	struct vfio_pci_mmap_vma *mmap_vma;
-
-	mutex_lock(&vdev->vma_lock);
-	list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) {
-		if (mmap_vma->vma == vma) {
-			list_del(&mmap_vma->vma_next);
-			kfree(mmap_vma);
-			break;
-		}
-	}
-	mutex_unlock(&vdev->vma_lock);
-}
-
-static vm_fault_t vfio_pci_mmap_fault(struct vm_fault *vmf)
-{
-	struct vm_area_struct *vma = vmf->vma;
-	struct vfio_pci_device *vdev = vma->vm_private_data;
-	struct vfio_pci_mmap_vma *mmap_vma;
-	vm_fault_t ret = VM_FAULT_NOPAGE;
-
-	mutex_lock(&vdev->vma_lock);
-	down_read(&vdev->memory_lock);
-
-	if (!__vfio_pci_memory_enabled(vdev)) {
-		ret = VM_FAULT_SIGBUS;
-		goto up_out;
-	}
-
-	/*
-	 * We populate the whole vma on fault, so we need to test whether
-	 * the vma has already been mapped, such as for concurrent faults
-	 * to the same vma.  io_remap_pfn_range() will trigger a BUG_ON if
-	 * we ask it to fill the same range again.
-	 */
-	list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) {
-		if (mmap_vma->vma == vma)
-			goto up_out;
-	}
-
-	if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
-			       vma->vm_end - vma->vm_start,
-			       vma->vm_page_prot)) {
-		ret = VM_FAULT_SIGBUS;
-		zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
-		goto up_out;
-	}
-
-	if (__vfio_pci_add_vma(vdev, vma)) {
-		ret = VM_FAULT_OOM;
-		zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
-	}
-
-up_out:
-	up_read(&vdev->memory_lock);
-	mutex_unlock(&vdev->vma_lock);
-	return ret;
-}
-
-static const struct vm_operations_struct vfio_pci_mmap_ops = {
-	.open = vfio_pci_mmap_open,
-	.close = vfio_pci_mmap_close,
-	.fault = vfio_pci_mmap_fault,
-};
-
-static int vfio_pci_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma)
-{
-	struct vfio_pci_device *vdev =
-		container_of(core_vdev, struct vfio_pci_device, vdev);
-	struct pci_dev *pdev = vdev->pdev;
-	unsigned int index;
-	u64 phys_len, req_len, pgoff, req_start;
-	int ret;
-
-	index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
-
-	if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
-		return -EINVAL;
-	if (vma->vm_end < vma->vm_start)
-		return -EINVAL;
-	if ((vma->vm_flags & VM_SHARED) == 0)
-		return -EINVAL;
-	if (index >= VFIO_PCI_NUM_REGIONS) {
-		int regnum = index - VFIO_PCI_NUM_REGIONS;
-		struct vfio_pci_region *region = vdev->region + regnum;
-
-		if (region->ops && region->ops->mmap &&
-		    (region->flags & VFIO_REGION_INFO_FLAG_MMAP))
-			return region->ops->mmap(vdev, region, vma);
-		return -EINVAL;
-	}
-	if (index >= VFIO_PCI_ROM_REGION_INDEX)
-		return -EINVAL;
-	if (!vdev->bar_mmap_supported[index])
-		return -EINVAL;
-
-	phys_len = PAGE_ALIGN(pci_resource_len(pdev, index));
-	req_len = vma->vm_end - vma->vm_start;
-	pgoff = vma->vm_pgoff &
-		((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
-	req_start = pgoff << PAGE_SHIFT;
-
-	if (req_start + req_len > phys_len)
-		return -EINVAL;
-
-	/*
-	 * Even though we don't make use of the barmap for the mmap,
-	 * we need to request the region and the barmap tracks that.
-	 */
-	if (!vdev->barmap[index]) {
-		ret = pci_request_selected_regions(pdev,
-						   1 << index, "vfio-pci");
-		if (ret)
-			return ret;
-
-		vdev->barmap[index] = pci_iomap(pdev, index, 0);
-		if (!vdev->barmap[index]) {
-			pci_release_selected_regions(pdev, 1 << index);
-			return -ENOMEM;
-		}
-	}
-
-	vma->vm_private_data = vdev;
-	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-	vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
-
-	/*
-	 * See remap_pfn_range(), called from vfio_pci_fault() but we can't
-	 * change vm_flags within the fault handler.  Set them now.
-	 */
-	vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
-	vma->vm_ops = &vfio_pci_mmap_ops;
-
-	return 0;
-}
-
-static void vfio_pci_request(struct vfio_device *core_vdev, unsigned int count)
-{
-	struct vfio_pci_device *vdev =
-		container_of(core_vdev, struct vfio_pci_device, vdev);
-	struct pci_dev *pdev = vdev->pdev;
-
-	mutex_lock(&vdev->igate);
-
-	if (vdev->req_trigger) {
-		if (!(count % 10))
-			pci_notice_ratelimited(pdev,
-				"Relaying device request to user (#%u)\n",
-				count);
-		eventfd_signal(vdev->req_trigger, 1);
-	} else if (count == 0) {
-		pci_warn(pdev,
-			"No device request channel registered, blocked until released by user\n");
-	}
-
-	mutex_unlock(&vdev->igate);
-}
-
-static int vfio_pci_validate_vf_token(struct vfio_pci_device *vdev,
-				      bool vf_token, uuid_t *uuid)
-{
-	/*
-	 * There's always some degree of trust or collaboration between SR-IOV
-	 * PF and VFs, even if just that the PF hosts the SR-IOV capability and
-	 * can disrupt VFs with a reset, but often the PF has more explicit
-	 * access to deny service to the VF or access data passed through the
-	 * VF.  We therefore require an opt-in via a shared VF token (UUID) to
-	 * represent this trust.  This both prevents that a VF driver might
-	 * assume the PF driver is a trusted, in-kernel driver, and also that
-	 * a PF driver might be replaced with a rogue driver, unknown to in-use
-	 * VF drivers.
-	 *
-	 * Therefore when presented with a VF, if the PF is a vfio device and
-	 * it is bound to the vfio-pci driver, the user needs to provide a VF
-	 * token to access the device, in the form of appending a vf_token to
-	 * the device name, for example:
-	 *
-	 * "0000:04:10.0 vf_token=bd8d9d2b-5a5f-4f5a-a211-f591514ba1f3"
-	 *
-	 * When presented with a PF which has VFs in use, the user must also
-	 * provide the current VF token to prove collaboration with existing
-	 * VF users.  If VFs are not in use, the VF token provided for the PF
-	 * device will act to set the VF token.
-	 *
-	 * If the VF token is provided but unused, an error is generated.
-	 */
-	if (!vdev->pdev->is_virtfn && !vdev->vf_token && !vf_token)
-		return 0; /* No VF token provided or required */
-
-	if (vdev->pdev->is_virtfn) {
-		struct vfio_pci_device *pf_vdev = get_pf_vdev(vdev);
-		bool match;
-
-		if (!pf_vdev) {
-			if (!vf_token)
-				return 0; /* PF is not vfio-pci, no VF token */
-
-			pci_info_ratelimited(vdev->pdev,
-				"VF token incorrectly provided, PF not bound to vfio-pci\n");
-			return -EINVAL;
-		}
-
-		if (!vf_token) {
-			vfio_device_put(&pf_vdev->vdev);
-			pci_info_ratelimited(vdev->pdev,
-				"VF token required to access device\n");
-			return -EACCES;
-		}
-
-		mutex_lock(&pf_vdev->vf_token->lock);
-		match = uuid_equal(uuid, &pf_vdev->vf_token->uuid);
-		mutex_unlock(&pf_vdev->vf_token->lock);
-
-		vfio_device_put(&pf_vdev->vdev);
-
-		if (!match) {
-			pci_info_ratelimited(vdev->pdev,
-				"Incorrect VF token provided for device\n");
-			return -EACCES;
-		}
-	} else if (vdev->vf_token) {
-		mutex_lock(&vdev->vf_token->lock);
-		if (vdev->vf_token->users) {
-			if (!vf_token) {
-				mutex_unlock(&vdev->vf_token->lock);
-				pci_info_ratelimited(vdev->pdev,
-					"VF token required to access device\n");
-				return -EACCES;
-			}
-
-			if (!uuid_equal(uuid, &vdev->vf_token->uuid)) {
-				mutex_unlock(&vdev->vf_token->lock);
-				pci_info_ratelimited(vdev->pdev,
-					"Incorrect VF token provided for device\n");
-				return -EACCES;
-			}
-		} else if (vf_token) {
-			uuid_copy(&vdev->vf_token->uuid, uuid);
-		}
-
-		mutex_unlock(&vdev->vf_token->lock);
-	} else if (vf_token) {
-		pci_info_ratelimited(vdev->pdev,
-			"VF token incorrectly provided, not a PF or VF\n");
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-#define VF_TOKEN_ARG "vf_token="
-
-static int vfio_pci_match(struct vfio_device *core_vdev, char *buf)
-{
-	struct vfio_pci_device *vdev =
-		container_of(core_vdev, struct vfio_pci_device, vdev);
-	bool vf_token = false;
-	uuid_t uuid;
-	int ret;
-
-	if (strncmp(pci_name(vdev->pdev), buf, strlen(pci_name(vdev->pdev))))
-		return 0; /* No match */
-
-	if (strlen(buf) > strlen(pci_name(vdev->pdev))) {
-		buf += strlen(pci_name(vdev->pdev));
-
-		if (*buf != ' ')
-			return 0; /* No match: non-whitespace after name */
-
-		while (*buf) {
-			if (*buf == ' ') {
-				buf++;
-				continue;
-			}
-
-			if (!vf_token && !strncmp(buf, VF_TOKEN_ARG,
-						  strlen(VF_TOKEN_ARG))) {
-				buf += strlen(VF_TOKEN_ARG);
-
-				if (strlen(buf) < UUID_STRING_LEN)
-					return -EINVAL;
-
-				ret = uuid_parse(buf, &uuid);
-				if (ret)
-					return ret;
-
-				vf_token = true;
-				buf += UUID_STRING_LEN;
-			} else {
-				/* Unknown/duplicate option */
-				return -EINVAL;
-			}
-		}
-	}
-
-	ret = vfio_pci_validate_vf_token(vdev, vf_token, &uuid);
-	if (ret)
-		return ret;
-
-	return 1; /* Match */
-}
-
-static const struct vfio_device_ops vfio_pci_ops = {
-	.name		= "vfio-pci",
-	.open_device	= vfio_pci_open_device,
-	.close_device	= vfio_pci_close_device,
-	.ioctl		= vfio_pci_ioctl,
-	.read		= vfio_pci_read,
-	.write		= vfio_pci_write,
-	.mmap		= vfio_pci_mmap,
-	.request	= vfio_pci_request,
-	.match		= vfio_pci_match,
-};
-
-static int vfio_pci_bus_notifier(struct notifier_block *nb,
-				 unsigned long action, void *data)
-{
-	struct vfio_pci_device *vdev = container_of(nb,
-						    struct vfio_pci_device, nb);
-	struct device *dev = data;
-	struct pci_dev *pdev = to_pci_dev(dev);
-	struct pci_dev *physfn = pci_physfn(pdev);
-
-	if (action == BUS_NOTIFY_ADD_DEVICE &&
-	    pdev->is_virtfn && physfn == vdev->pdev) {
-		pci_info(vdev->pdev, "Captured SR-IOV VF %s driver_override\n",
-			 pci_name(pdev));
-		pdev->driver_override = kasprintf(GFP_KERNEL, "%s",
-						  vfio_pci_ops.name);
-	} else if (action == BUS_NOTIFY_BOUND_DRIVER &&
-		   pdev->is_virtfn && physfn == vdev->pdev) {
-		struct pci_driver *drv = pci_dev_driver(pdev);
-
-		if (drv && drv != &vfio_pci_driver)
-			pci_warn(vdev->pdev,
-				 "VF %s bound to driver %s while PF bound to vfio-pci\n",
-				 pci_name(pdev), drv->name);
-	}
-
-	return 0;
-}
-
-static int vfio_pci_vf_init(struct vfio_pci_device *vdev)
-{
-	struct pci_dev *pdev = vdev->pdev;
-	int ret;
-
-	if (!pdev->is_physfn)
-		return 0;
-
-	vdev->vf_token = kzalloc(sizeof(*vdev->vf_token), GFP_KERNEL);
-	if (!vdev->vf_token)
-		return -ENOMEM;
-
-	mutex_init(&vdev->vf_token->lock);
-	uuid_gen(&vdev->vf_token->uuid);
-
-	vdev->nb.notifier_call = vfio_pci_bus_notifier;
-	ret = bus_register_notifier(&pci_bus_type, &vdev->nb);
-	if (ret) {
-		kfree(vdev->vf_token);
-		return ret;
-	}
-	return 0;
-}
-
-static void vfio_pci_vf_uninit(struct vfio_pci_device *vdev)
-{
-	if (!vdev->vf_token)
-		return;
-
-	bus_unregister_notifier(&pci_bus_type, &vdev->nb);
-	WARN_ON(vdev->vf_token->users);
-	mutex_destroy(&vdev->vf_token->lock);
-	kfree(vdev->vf_token);
-}
-
-static int vfio_pci_vga_init(struct vfio_pci_device *vdev)
-{
-	struct pci_dev *pdev = vdev->pdev;
-	int ret;
-
-	if (!vfio_pci_is_vga(pdev))
-		return 0;
-
-	ret = vga_client_register(pdev, vdev, NULL, vfio_pci_set_vga_decode);
-	if (ret)
-		return ret;
-	vga_set_legacy_decoding(pdev, vfio_pci_set_vga_decode(vdev, false));
-	return 0;
-}
-
-static void vfio_pci_vga_uninit(struct vfio_pci_device *vdev)
-{
-	struct pci_dev *pdev = vdev->pdev;
-
-	if (!vfio_pci_is_vga(pdev))
-		return;
-	vga_client_register(pdev, NULL, NULL, NULL);
-	vga_set_legacy_decoding(pdev, VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM |
-					      VGA_RSRC_LEGACY_IO |
-					      VGA_RSRC_LEGACY_MEM);
-}
-
-static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
-{
-	struct vfio_pci_device *vdev;
-	struct iommu_group *group;
-	int ret;
-
-	if (vfio_pci_is_denylisted(pdev))
-		return -EINVAL;
-
-	if (pdev->hdr_type != PCI_HEADER_TYPE_NORMAL)
-		return -EINVAL;
-
-	/*
-	 * Prevent binding to PFs with VFs enabled, the VFs might be in use
-	 * by the host or other users.  We cannot capture the VFs if they
-	 * already exist, nor can we track VF users.  Disabling SR-IOV here
-	 * would initiate removing the VFs, which would unbind the driver,
-	 * which is prone to blocking if that VF is also in use by vfio-pci.
-	 * Just reject these PFs and let the user sort it out.
-	 */
-	if (pci_num_vf(pdev)) {
-		pci_warn(pdev, "Cannot bind to PF with SR-IOV enabled\n");
-		return -EBUSY;
-	}
-
-	group = vfio_iommu_group_get(&pdev->dev);
-	if (!group)
-		return -EINVAL;
-
-	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
-	if (!vdev) {
-		ret = -ENOMEM;
-		goto out_group_put;
-	}
-
-	vfio_init_group_dev(&vdev->vdev, &pdev->dev, &vfio_pci_ops);
-	vdev->pdev = pdev;
-	vdev->irq_type = VFIO_PCI_NUM_IRQS;
-	mutex_init(&vdev->igate);
-	spin_lock_init(&vdev->irqlock);
-	mutex_init(&vdev->ioeventfds_lock);
-	INIT_LIST_HEAD(&vdev->dummy_resources_list);
-	INIT_LIST_HEAD(&vdev->ioeventfds_list);
-	mutex_init(&vdev->vma_lock);
-	INIT_LIST_HEAD(&vdev->vma_list);
-	init_rwsem(&vdev->memory_lock);
-
-	if (pci_is_root_bus(pdev->bus)) {
-		ret = vfio_assign_device_set(&vdev->vdev, vdev);
-	} else if (!pci_probe_reset_slot(pdev->slot)) {
-		ret = vfio_assign_device_set(&vdev->vdev, pdev->slot);
-	} else {
-		/*
-		 * If there is no slot reset support for this device, the whole
-		 * bus needs to be grouped together to support bus-wide resets.
-		 */
-		ret = vfio_assign_device_set(&vdev->vdev, pdev->bus);
-	}
-
-	if (ret)
-		goto out_uninit;
-	ret = vfio_pci_vf_init(vdev);
-	if (ret)
-		goto out_uninit;
-	ret = vfio_pci_vga_init(vdev);
-	if (ret)
-		goto out_vf;
-
-	vfio_pci_probe_power_state(vdev);
-
-	if (!disable_idle_d3) {
-		/*
-		 * pci-core sets the device power state to an unknown value at
-		 * bootup and after being removed from a driver.  The only
-		 * transition it allows from this unknown state is to D0, which
-		 * typically happens when a driver calls pci_enable_device().
-		 * We're not ready to enable the device yet, but we do want to
-		 * be able to get to D3.  Therefore first do a D0 transition
-		 * before going to D3.
-		 */
-		vfio_pci_set_power_state(vdev, PCI_D0);
-		vfio_pci_set_power_state(vdev, PCI_D3hot);
-	}
-
-	ret = vfio_register_group_dev(&vdev->vdev);
-	if (ret)
-		goto out_power;
-	dev_set_drvdata(&pdev->dev, vdev);
-	return 0;
-
-out_power:
-	if (!disable_idle_d3)
-		vfio_pci_set_power_state(vdev, PCI_D0);
-out_vf:
-	vfio_pci_vf_uninit(vdev);
-out_uninit:
-	vfio_uninit_group_dev(&vdev->vdev);
-	kfree(vdev->pm_save);
-	kfree(vdev);
-out_group_put:
-	vfio_iommu_group_put(group, &pdev->dev);
-	return ret;
-}
-
-static void vfio_pci_remove(struct pci_dev *pdev)
-{
-	struct vfio_pci_device *vdev = dev_get_drvdata(&pdev->dev);
-
-	pci_disable_sriov(pdev);
-
-	vfio_unregister_group_dev(&vdev->vdev);
-
-	vfio_pci_vf_uninit(vdev);
-	vfio_uninit_group_dev(&vdev->vdev);
-	vfio_pci_vga_uninit(vdev);
-
-	vfio_iommu_group_put(pdev->dev.iommu_group, &pdev->dev);
-
-	if (!disable_idle_d3)
-		vfio_pci_set_power_state(vdev, PCI_D0);
-
-	mutex_destroy(&vdev->ioeventfds_lock);
-	kfree(vdev->region);
-	kfree(vdev->pm_save);
-	kfree(vdev);
-}
-
-static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
-						  pci_channel_state_t state)
-{
-	struct vfio_pci_device *vdev;
-	struct vfio_device *device;
-
-	device = vfio_device_get_from_dev(&pdev->dev);
-	if (device == NULL)
-		return PCI_ERS_RESULT_DISCONNECT;
-
-	vdev = container_of(device, struct vfio_pci_device, vdev);
-
-	mutex_lock(&vdev->igate);
-
-	if (vdev->err_trigger)
-		eventfd_signal(vdev->err_trigger, 1);
-
-	mutex_unlock(&vdev->igate);
-
-	vfio_device_put(device);
-
-	return PCI_ERS_RESULT_CAN_RECOVER;
-}
-
-static int vfio_pci_sriov_configure(struct pci_dev *pdev, int nr_virtfn)
-{
-	struct vfio_device *device;
-	int ret = 0;
-
-	might_sleep();
-
-	if (!enable_sriov)
-		return -ENOENT;
-
-	device = vfio_device_get_from_dev(&pdev->dev);
-	if (!device)
-		return -ENODEV;
-
-	if (nr_virtfn == 0)
-		pci_disable_sriov(pdev);
-	else
-		ret = pci_enable_sriov(pdev, nr_virtfn);
-
-	vfio_device_put(device);
-
-	return ret < 0 ? ret : nr_virtfn;
-}
-
-static const struct pci_error_handlers vfio_err_handlers = {
-	.error_detected = vfio_pci_aer_err_detected,
-};
-
-static struct pci_driver vfio_pci_driver = {
-	.name			= "vfio-pci",
-	.id_table		= NULL, /* only dynamic ids */
-	.probe			= vfio_pci_probe,
-	.remove			= vfio_pci_remove,
-	.sriov_configure	= vfio_pci_sriov_configure,
-	.err_handler		= &vfio_err_handlers,
-};
-
-static bool vfio_dev_in_groups(struct vfio_pci_device *vdev,
-			       struct vfio_pci_group_info *groups)
-{
-	unsigned int i;
-
-	for (i = 0; i < groups->count; i++)
-		if (groups->groups[i] == vdev->vdev.group)
-			return true;
-	return false;
-}
-
-static int vfio_pci_is_device_in_set(struct pci_dev *pdev, void *data)
-{
-	struct vfio_device_set *dev_set = data;
-	struct vfio_device *cur;
-
-	list_for_each_entry(cur, &dev_set->device_list, dev_set_list)
-		if (cur->dev == &pdev->dev)
-			return 0;
-	return -EBUSY;
-}
-
-/*
- * vfio-core considers a group to be viable and will create a vfio_device even
- * if some devices are bound to drivers like pci-stub or pcieport. Here we
- * require all PCI devices to be inside our dev_set since that ensures they stay
- * put and that every driver controlling the device can co-ordinate with the
- * device reset.
- *
- * Returns the pci_dev to pass to pci_reset_bus() if every PCI device to be
- * reset is inside the dev_set, and pci_reset_bus() can succeed. NULL otherwise.
- */
-static struct pci_dev *
-vfio_pci_dev_set_resettable(struct vfio_device_set *dev_set)
-{
-	struct pci_dev *pdev;
-
-	lockdep_assert_held(&dev_set->lock);
-
-	/*
-	 * By definition all PCI devices in the dev_set share the same PCI
-	 * reset, so any pci_dev will have the same outcomes for
-	 * pci_probe_reset_*() and pci_reset_bus().
-	 */
-	pdev = list_first_entry(&dev_set->device_list, struct vfio_pci_device,
-				vdev.dev_set_list)->pdev;
-
-	/* pci_reset_bus() is supported */
-	if (pci_probe_reset_slot(pdev->slot) && pci_probe_reset_bus(pdev->bus))
-		return NULL;
-
-	if (vfio_pci_for_each_slot_or_bus(pdev, vfio_pci_is_device_in_set,
-					  dev_set,
-					  !pci_probe_reset_slot(pdev->slot)))
-		return NULL;
-	return pdev;
-}
-
-/*
- * We need to get memory_lock for each device, but devices can share mmap_lock,
- * therefore we need to zap and hold the vma_lock for each device, and only then
- * get each memory_lock.
- */
-static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
-				      struct vfio_pci_group_info *groups)
-{
-	struct vfio_pci_device *cur_mem;
-	struct vfio_pci_device *cur_vma;
-	struct vfio_pci_device *cur;
-	struct pci_dev *pdev;
-	bool is_mem = true;
-	int ret;
-
-	mutex_lock(&dev_set->lock);
-	cur_mem = list_first_entry(&dev_set->device_list,
-				   struct vfio_pci_device, vdev.dev_set_list);
-
-	pdev = vfio_pci_dev_set_resettable(dev_set);
-	if (!pdev) {
-		ret = -EINVAL;
-		goto err_unlock;
-	}
-
-	list_for_each_entry(cur_vma, &dev_set->device_list, vdev.dev_set_list) {
-		/*
-		 * Test whether all the affected devices are contained by the
-		 * set of groups provided by the user.
-		 */
-		if (!vfio_dev_in_groups(cur_vma, groups)) {
-			ret = -EINVAL;
-			goto err_undo;
-		}
-
-		/*
-		 * Locking multiple devices is prone to deadlock, runaway and
-		 * unwind if we hit contention.
-		 */
-		if (!vfio_pci_zap_and_vma_lock(cur_vma, true)) {
-			ret = -EBUSY;
-			goto err_undo;
-		}
-	}
-	cur_vma = NULL;
-
-	list_for_each_entry(cur_mem, &dev_set->device_list, vdev.dev_set_list) {
-		if (!down_write_trylock(&cur_mem->memory_lock)) {
-			ret = -EBUSY;
-			goto err_undo;
-		}
-		mutex_unlock(&cur_mem->vma_lock);
-	}
-	cur_mem = NULL;
-
-	ret = pci_reset_bus(pdev);
-
-err_undo:
-	list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
-		if (cur == cur_mem)
-			is_mem = false;
-		if (cur == cur_vma)
-			break;
-		if (is_mem)
-			up_write(&cur->memory_lock);
-		else
-			mutex_unlock(&cur->vma_lock);
-	}
-err_unlock:
-	mutex_unlock(&dev_set->lock);
-	return ret;
-}
-
-static bool vfio_pci_dev_set_needs_reset(struct vfio_device_set *dev_set)
-{
-	struct vfio_pci_device *cur;
-	bool needs_reset = false;
-
-	list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
-		/* No VFIO device in the set can have an open device FD */
-		if (cur->vdev.open_count)
-			return false;
-		needs_reset |= cur->needs_reset;
-	}
-	return needs_reset;
-}
-
-/*
- * If a bus or slot reset is available for the provided dev_set and:
- *  - All of the devices affected by that bus or slot reset are unused
- *  - At least one of the affected devices is marked dirty via
- *    needs_reset (such as by lack of FLR support)
- * Then attempt to perform that bus or slot reset.
- * Returns true if the dev_set was reset.
- */
-static bool vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set)
-{
-	struct vfio_pci_device *cur;
-	struct pci_dev *pdev;
-	int ret;
-
-	if (!vfio_pci_dev_set_needs_reset(dev_set))
-		return false;
-
-	pdev = vfio_pci_dev_set_resettable(dev_set);
-	if (!pdev)
-		return false;
-
-	ret = pci_reset_bus(pdev);
-	if (ret)
-		return false;
-
-	list_for_each_entry(cur, &dev_set->device_list, vdev.dev_set_list) {
-		cur->needs_reset = false;
-		if (!disable_idle_d3)
-			vfio_pci_set_power_state(cur, PCI_D3hot);
-	}
-	return true;
-}
-
-static void __exit vfio_pci_cleanup(void)
-{
-	pci_unregister_driver(&vfio_pci_driver);
-	vfio_pci_uninit_perm_bits();
-}
-
-static void __init vfio_pci_fill_ids(void)
-{
-	char *p, *id;
-	int rc;
-
-	/* no ids passed actually */
-	if (ids[0] == '\0')
-		return;
-
-	/* add ids specified in the module parameter */
-	p = ids;
-	while ((id = strsep(&p, ","))) {
-		unsigned int vendor, device, subvendor = PCI_ANY_ID,
-			subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
-		int fields;
-
-		if (!strlen(id))
-			continue;
-
-		fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
-				&vendor, &device, &subvendor, &subdevice,
-				&class, &class_mask);
-
-		if (fields < 2) {
-			pr_warn("invalid id string \"%s\"\n", id);
-			continue;
-		}
-
-		rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
-				   subvendor, subdevice, class, class_mask, 0);
-		if (rc)
-			pr_warn("failed to add dynamic id [%04x:%04x[%04x:%04x]] class %#08x/%08x (%d)\n",
-				vendor, device, subvendor, subdevice,
-				class, class_mask, rc);
-		else
-			pr_info("add [%04x:%04x[%04x:%04x]] class %#08x/%08x\n",
-				vendor, device, subvendor, subdevice,
-				class, class_mask);
-	}
-}
-
-static int __init vfio_pci_init(void)
-{
-	int ret;
-
-	/* Allocate shared config space permission data used by all devices */
-	ret = vfio_pci_init_perm_bits();
-	if (ret)
-		return ret;
-
-	/* Register and scan for devices */
-	ret = pci_register_driver(&vfio_pci_driver);
-	if (ret)
-		goto out_driver;
-
-	vfio_pci_fill_ids();
-
-	if (disable_denylist)
-		pr_warn("device denylist disabled.\n");
-
-	return 0;
-
-out_driver:
-	vfio_pci_uninit_perm_bits();
-	return ret;
-}
-
-module_init(vfio_pci_init);
-module_exit(vfio_pci_cleanup);
-
-MODULE_VERSION(DRIVER_VERSION);
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR(DRIVER_AUTHOR);
-MODULE_DESCRIPTION(DRIVER_DESC);