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Alex Williamson 00b519c0bc vfio/helpers: Align mmaps 
Thanks to work by Peter Xu, support is introduced in Linux v6.12 to
allow pfnmap insertions at PMD and PUD levels of the page table.  This
means that provided a properly aligned mmap, the vfio driver is able
to map MMIO at significantly larger intervals than PAGE_SIZE.  For
example on x86_64 (the only architecture currently supporting huge
pfnmaps for PUD), rather than 4KiB mappings, we can map device MMIO
using 2MiB and even 1GiB page table entries.

Typically mmap will already provide PMD aligned mappings, so devices
with moderately sized MMIO ranges, even GPUs with standard 256MiB BARs,
will already take advantage of this support.  However in order to better
support devices exposing multi-GiB MMIO, such as 3D accelerators or GPUs
with resizable BARs enabled, we need to manually align the mmap.

There doesn't seem to be a way for userspace to easily learn about PMD
and PUD mapping level sizes, therefore this takes the simple approach
to align the mapping to the power-of-two size of the region, up to 1GiB,
which is currently the maximum alignment we care about.

Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
 		2024-10-23 14:46:24 +02:00
..
9pfs 9p: remove 'proxy' filesystem backend driver 2024-10-03 19:33:25 +02:00
acpi acpi: ged: Add macro for acpi sleep control register 2024-10-16 15:56:42 +08:00
adc hw/adc: Remove MAX111X device 2024-10-15 15:16:17 +01:00
alpha alpha: switch boards to "default y" 2024-05-03 15:47:47 +02:00
arm hw/arm/xilinx_zynq: Add various missing unimplemented devices 2024-10-15 15:16:17 +01:00
audio hw/audio/hda: fix memory leak on audio setup 2024-10-14 17:34:09 +04:00
avr avr: switch boards to "default y" 2024-05-03 15:47:47 +02:00
block hw/block: Remove ecc 2024-10-15 15:16:17 +01:00
char hw/char/pl011: Use correct masks for IBRD and FBRD 2024-10-15 15:16:17 +01:00
core block: Adjust check_block_size() signature 2024-10-18 15:03:35 +02:00
cpu hw: Add a Kconfig switch for the TYPE_CPU_CLUSTER device 2024-04-25 12:48:12 +02:00
cxl hw: Use device_class_set_legacy_reset() instead of opencoding 2024-09-13 15:31:44 +01:00
display ui: refactor using a common qemu_pixman_shareable 2024-10-14 17:34:09 +04:00
dma hw/dma: Remove omap_dma4 device 2024-10-01 14:58:07 +01:00
fsi hw: Use device_class_set_legacy_reset() instead of opencoding 2024-09-13 15:31:44 +01:00
gpio hw/gpio: Remove MAX7310 device 2024-10-15 15:16:17 +01:00
hppa hw/char: Extract serial-mm 2024-10-03 19:33:23 +02:00
hyperv hw/hyperv: remove return after g_assert_not_reached() 2024-09-24 13:53:35 +02:00
i2c hw/i2c/aspeed: Add support for 64 bit addresses 2024-09-16 17:44:08 +02:00
i386 hw/i386: Use explicit little-endian LD/ST API 2024-10-15 12:13:59 -03:00
ide hw/ide: Remove DSCM-1XXXX microdrive device model 2024-10-15 15:16:17 +01:00
input hw/input: Remove lm832x device 2024-10-01 14:41:10 +01:00
intc hw/intc/openpic: Improve errors for out of bounds property values 2024-10-18 15:03:35 +02:00
ipack hw/ipack: Constify VMState 2023-12-29 11:17:30 +11:00
ipmi hw/ipmi: Constify VMState 2023-12-29 11:17:30 +11:00
isa hw/char/serial.h: Extract serial-isa.h 2024-10-03 19:33:23 +02:00
loongarch hw/loongarch/fw_cfg: Build in common_ss[] 2024-10-16 16:06:07 +08:00
m68k hw/m68k: Use explicit big-endian LD/ST API 2024-10-07 11:33:20 +02:00
mem hw: Use device_class_set_legacy_reset() instead of opencoding 2024-09-13 15:31:44 +01:00
microblaze hw/char: Extract serial-mm 2024-10-03 19:33:23 +02:00
mips hw/mips: Have mips_cpu_create_with_clock() take an endianness argument 2024-10-15 12:21:06 -03:00
misc hw/block: Remove ecc 2024-10-15 15:16:17 +01:00
net hw/net/rocker: Remove unused rocker_fp_ports 2024-10-03 17:26:06 +03:00
nubus hw/nubus/nubus-device: Range check 'slot' property 2024-09-08 11:49:49 +02:00
nvme hw/nvme: add atomic write support 2024-10-01 09:02:05 +02:00
nvram hw: Remove unused fw_cfg_init_io 2024-10-03 17:26:06 +03:00
openrisc hw/char: Extract serial-mm 2024-10-03 19:33:23 +02:00
pci hw/pci: Remove unused pcie_chassis_find_slot 2024-10-03 17:26:06 +03:00
pci-bridge hw/pci-bridge: Add a Kconfig switch for the normal PCI bridge 2024-10-21 13:25:12 +02:00
pci-host q35: Remove unused mch_mcfg_base 2024-10-03 17:26:05 +03:00
ppc hw/char: Extract serial-mm 2024-10-03 19:33:23 +02:00
remote remote: Remove unused remote_iohub_finalize 2024-10-03 17:26:06 +03:00
riscv * pc: Add a description for the i8042 property 2024-10-04 19:28:37 +01:00
rtc hw/rtc: Remove twl92230 device 2024-10-01 14:40:59 +01:00
rx kconfig: express dependency of individual boards on libfdt 2024-05-10 15:45:15 +02:00
s390x hw/s390x: Use explicit big-endian LD/ST API 2024-10-07 11:33:20 +02:00
scsi hw/vhost-scsi: fix -Werror=maybe-uninitialized 2024-10-02 16:14:29 +04:00
sd hw/sdhci: fix -Werror=maybe-uninitialized false-positive 2024-10-02 16:14:29 +04:00
sensor hw/sensor/tmp105: Lower 4 bit of limit registers are always 0 2024-09-13 20:11:13 +02:00
sh4 Revert "hw/sh4/r2d: Realize IDE controller before accessing it" 2024-10-21 16:40:11 +02:00
smbios smbios: make memory device size configurable per Machine 2024-07-22 20:15:41 -04:00
sparc hw: Use device_class_set_legacy_reset() instead of opencoding 2024-09-13 15:31:44 +01:00
sparc64 hw/char: Extract serial-mm 2024-10-03 19:33:23 +02:00
ssi hw/ssi: Allwinner A10 SPI emulation 2024-10-15 15:16:17 +01:00
timer hw/timer: Remove omap_synctimer 2024-10-01 14:56:27 +01:00
tpm hw/tpm: remove break after g_assert_not_reached() 2024-09-24 13:53:35 +02:00
tricore hw: Use device_class_set_legacy_reset() instead of opencoding 2024-09-13 15:31:44 +01:00
ufs hw/ufs: minor bug fixes related to ufs-test 2024-09-06 18:04:16 +09:00
usb hw/usb: Remove MUSB USB host controller 2024-10-01 14:43:02 +01:00
vfio vfio/helpers: Align mmaps 2024-10-23 14:46:24 +02:00
virtio vhost: Remove unused vhost_dev_{load|save}_inflight 2024-10-03 17:26:06 +03:00
watchdog hw/watchdog: replace assert(0) with g_assert_not_reached() 2024-09-13 20:12:16 +02:00
xen hw/xen: Avoid use of uninitialized bufioreq_evtchn 2024-10-21 07:53:21 +02:00
xenpv hw/xen: Register framebuffer backend via xen_backend_init() 2024-06-04 11:53:43 +02:00
xtensa hw/xtensa/xtfpga: Remove TARGET_BIG_ENDIAN #ifdef'ry 2024-10-15 12:13:59 -03:00
Kconfig hw: Remove PCMCIA subsystem 2024-10-15 15:16:17 +01:00
meson.build hw: Remove PCMCIA subsystem 2024-10-15 15:16:17 +01:00