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vfio/pci: declare generic quirks in a new header file

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Declare generic vfio_generic_{window_address,window_data,mirror}_quirk
in newly created pci_quirks.h so that they can be used elsewhere, like
igd.c.

Signed-off-by: Tomita Moeko <tomitamoeko@gmail.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Link: https://lore.kernel.org/r/20250104154219.7209-2-tomitamoeko@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Tomita Moeko 2025-01-04 23:42:16 +08:00 • committed by Cédric Le Goater
parent 6e7998ceb9
commit dee69a8ca6
2 changed files with 75 additions and 51 deletions
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71
hw/vfio/pci-quirks.h Normal file
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/*
* vfio generic region quirks (mostly backdoors to PCI config space)
*
* Copyright Red Hat, Inc. 2012-2015
*
* Authors:
* Alex Williamson <alex.williamson@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*/
#ifndef HW_VFIO_VFIO_PCI_QUIRKS_H
#define HW_VFIO_VFIO_PCI_QUIRKS_H
#include "qemu/osdep.h"
#include "exec/memop.h"
/*
* The generic window quirks operate on an address and data register,
* vfio_generic_window_address_quirk handles the address register and
* vfio_generic_window_data_quirk handles the data register. These ops
* pass reads and writes through to hardware until a value matching the
* stored address match/mask is written. When this occurs, the data
* register access emulated PCI config space for the device rather than
* passing through accesses. This enables devices where PCI config space
* is accessible behind a window register to maintain the virtualization
* provided through vfio.
*/
typedef struct VFIOConfigWindowMatch {
uint32_t match;
uint32_t mask;
} VFIOConfigWindowMatch;
typedef struct VFIOConfigWindowQuirk {
struct VFIOPCIDevice *vdev;
uint32_t address_val;
uint32_t address_offset;
uint32_t data_offset;
bool window_enabled;
uint8_t bar;
MemoryRegion *addr_mem;
MemoryRegion *data_mem;
uint32_t nr_matches;
VFIOConfigWindowMatch matches[];
} VFIOConfigWindowQuirk;
extern const MemoryRegionOps vfio_generic_window_address_quirk;
extern const MemoryRegionOps vfio_generic_window_data_quirk;
/*
* The generic mirror quirk handles devices which expose PCI config space
* through a region within a BAR. When enabled, reads and writes are
* redirected through to emulated PCI config space. XXX if PCI config space
* used memory regions, this could just be an alias.
*/
typedef struct VFIOConfigMirrorQuirk {
struct VFIOPCIDevice *vdev;
uint32_t offset;
uint8_t bar;
MemoryRegion *mem;
uint8_t data[];
} VFIOConfigMirrorQuirk;
extern const MemoryRegionOps vfio_generic_mirror_quirk;
#endif /* HW_VFIO_VFIO_PCI_QUIRKS_H */