linux/drivers/firmware
Ard Biesheuvel d3549a938b efi/arm64: libstub: avoid SetVirtualAddressMap() when possible
EFI's SetVirtualAddressMap() runtime service is a horrid hack that we'd
like to avoid using, if possible. For 64-bit architectures such as
arm64, the user and kernel mappings are entirely disjoint, and given
that we use the user region for mapping the UEFI runtime regions when
running under the OS, we don't rely on SetVirtualAddressMap() in the
conventional way, i.e., to permit kernel mappings of the OS to coexist
with kernel region mappings of the firmware regions. This means that, in
principle, we should be able to avoid SetVirtualAddressMap() altogether,
and simply use the 1:1 mapping that UEFI uses at boot time. (Note that
omitting SetVirtualAddressMap() is explicitly permitted by the UEFI
spec).

However, there is a corner case on arm64, which, if configured for
3-level paging (or 2-level paging when using 64k pages), may not be able
to cover the entire range of firmware mappings (which might contain both
memory and MMIO peripheral mappings).

So let's avoid SetVirtualAddressMap() on arm64, but only if the VA space
is guaranteed to be of sufficient size.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
2022-09-27 13:26:16 +02:00
..
arm_ffa firmware: arm_ffa: Remove incorrect assignment of driver_data 2022-04-29 14:51:46 +01:00
arm_scmi Power management updates for 5.20-rc1 2022-08-02 11:17:00 -07:00
broadcom firmware: tee_bnxt: Use UUID API for exporting the UUID 2022-05-05 18:14:29 -07:00
cirrus firmware: cs_dsp: Add memory chunk helpers 2022-07-22 13:40:00 +01:00
efi efi/arm64: libstub: avoid SetVirtualAddressMap() when possible 2022-09-27 13:26:16 +02:00
google firmware: google: Properly state IOMEM dependency 2022-03-18 14:18:15 +01:00
imx firmware: imx: scu-pd: imx8q: add vpu mu resources 2022-02-20 14:55:32 +08:00
meson
psci firmware/psci: fix application of sizeof to pointer 2021-10-26 17:40:54 -05:00
smccc printk: stop including cache.h from printk.h 2022-05-13 07:20:07 -07:00
tegra firmware: tegra: Fix error check return value of debugfs_create_file() 2022-07-08 17:56:03 +02:00
xilinx firmware: xilinx: Add TF_A_PM_REGISTER_SGI SMC call 2022-06-29 14:46:22 +02:00
arm_scpi.c firmware: arm_scpi: Ensure scpi_info is not assigned if the probe fails 2022-07-04 14:28:42 +01:00
arm_sdei.c ACPI: APEI: explicit init of HEST and GHES in apci_init() 2022-03-03 20:24:22 +01:00
dmi_scan.c
dmi-id.c firmware: dmi: Move product_sku info to the end of the modalias 2021-09-02 17:28:53 +02:00
dmi-sysfs.c firmware: dmi-sysfs: Fix memory leak in dmi_sysfs_register_handle 2022-05-19 18:56:56 +02:00
edd.c edd: simplify the check of 'attr->test' in edd_populate_dir() 2022-05-19 18:57:04 +02:00
iscsi_ibft_find.c iscsi_ibft: fix warning in reserve_ibft_region() 2021-08-05 19:47:57 -04:00
iscsi_ibft.c iscsi_ibft: Fix isa_bus_to_virt not working under ARM 2021-09-02 16:22:00 -04:00
Kconfig sound updates for 5.19-rc1 2022-05-25 16:55:16 -07:00
Makefile Follow-up tweaks for the EFI changes in v5.19 2022-06-03 13:39:30 -07:00
memmap.c firmware: memmap: use default_groups in kobj_type 2022-01-05 19:17:29 +01:00
mtk-adsp-ipc.c firmware: mediatek: Use meaningful names for mbox 2022-06-22 13:39:30 +01:00
pcdp.c
pcdp.h
qcom_scm-legacy.c firmware: qcom_scm-legacy: correct kerneldoc 2022-06-25 22:04:31 -05:00
qcom_scm-smc.c
qcom_scm.c firmware: qcom_scm: Add bw voting support to the SCM interface 2022-06-29 21:48:32 -05:00
qcom_scm.h firmware: qcom: scm: Add support for MC boot address API 2022-02-03 21:54:48 -06:00
qemu_fw_cfg.c firmware: qemu_fw_cfg: remove sysfs entries explicitly 2022-01-14 18:50:52 -05:00
raspberrypi.c firmware: raspberrypi: Fix a leak in 'rpi_firmware_get()' 2021-08-18 16:02:08 +02:00
scpi_pm_domain.c firmware: arm_scpi: Fix string overflow in SCPI genpd driver 2021-12-13 15:17:37 +01:00
stratix10-rsu.c firmware: stratix10-rsu: extend RSU driver to get DCMF status 2022-07-14 16:55:09 +02:00
stratix10-svc.c firmware: stratix10-svc: To support a command ATF Get Version 2022-07-14 16:55:09 +02:00
sysfb_simplefb.c firmware: sysfb: Make sysfb_create_simplefb() return a pdev pointer 2022-06-29 09:51:31 +02:00
sysfb.c firmware: sysfb: Add sysfb_disable() helper function 2022-06-29 09:51:41 +02:00
ti_sci.c firmware: ti_sci: Switch transport to polled mode during system suspend 2022-05-03 06:52:11 -05:00
ti_sci.h
trusted_foundations.c
turris-mox-rwtm.c mvebu drivers for 5.14 (part 1) 2021-06-23 18:57:40 -07:00