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db227c19e6
linux/arch/arm
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Ard Biesheuvel db227c19e6 ARM: 8985/1: efi/decompressor: deal with HYP mode boot gracefully 
EFI on ARM only supports short descriptors, and given that it mandates
that the MMU and caches are on, it is implied that booting in HYP mode
is not supported.

However, implementations of EFI exist (i.e., U-Boot) that ignore this
requirement, which is not entirely unreasonable, given that it makes
HYP mode inaccessible to the operating system.

So let's make sure that we can deal with this condition gracefully.
We already tolerate booting the EFI stub with the caches off (even
though this violates the EFI spec as well), and so we should deal
with HYP mode boot with MMU and caches either on or off.

- When the MMU and caches are on, we can ignore the HYP stub altogether,
  since we can carry on executing at HYP. We do need to ensure that we
  disable the MMU at HYP before entering the kernel proper.

- When the MMU and caches are off, we have to drop to SVC mode so that
  we can set up the page tables using short descriptors. In this case,
  we need to install the HYP stub as usual, so that we can return to HYP
  mode before handing over to the kernel proper.

Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
2020-06-13 11:11:18 +01:00
..
boot ARM: 8985/1: efi/decompressor: deal with HYP mode boot gracefully 2020-06-13 11:11:18 +01:00
common ARM: sa1111: Fix irq_retrigger callback return value 2020-03-16 15:48:54 +00:00
configs ARM: defconfig updates fopr 5.8 2020-06-04 19:54:15 -07:00
crypto Merge branch 'rwonce/rework' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux 2020-06-10 14:46:54 -07:00
include mm: consolidate pte_index() and pte_offset_*() definitions 2020-06-09 09:39:14 -07:00
kernel mmap locking API: convert mmap_sem comments 2020-06-09 09:39:14 -07:00
lib mmap locking API: use coccinelle to convert mmap_sem rwsem call sites 2020-06-09 09:39:14 -07:00
mach-actions ARM: actions: Drop unneeded select of COMMON_CLK 2020-05-15 23:27:37 +02:00
mach-alpine ARM: alpine: Drop unneeded select of HAVE_SMP 2020-05-15 23:27:37 +02:00
mach-artpec
mach-asm9260 ARM: asm9260: Drop unneeded select of GENERIC_CLOCKEVENTS 2020-05-15 23:27:37 +02:00
mach-aspeed ARM: aspeed: Drop unneeded select of HAVE_SMP 2020-05-15 23:27:37 +02:00
mach-at91 ARM: SoC updates 2020-04-03 15:02:35 -07:00
mach-axxia
mach-bcm
mach-berlin ARM: berlin: Drop unneeded select of HAVE_SMP 2020-05-15 23:27:37 +02:00
mach-clps711x ARM: clps711x: Drop unneeded select of multi-platform selected options 2020-05-15 23:27:37 +02:00
mach-cns3xxx ARM: cns3xxx: replace setup_irq() by request_irq() 2020-03-27 14:11:47 +01:00
mach-davinci ARM: davinci: fix build failure without I2C 2020-05-28 12:35:00 +02:00
mach-digicolor
mach-dove arm: mach-dove: Mark dove_io_desc as __maybe_unused 2020-03-13 21:44:50 +01:00
mach-ebsa110 mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
mach-efm32
mach-ep93xx ARM: ep93xx: Replace setup_irq() by request_irq() 2020-03-27 14:11:42 +01:00
mach-exynos arm: Unplug KVM from the build system 2020-03-24 10:55:50 +00:00
mach-footbridge mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
mach-gemini
mach-highbank
mach-hisi
mach-imx mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
mach-integrator mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
mach-iop32x mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
mach-ixp4xx mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
mach-keystone mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
mach-lpc18xx
mach-lpc32xx
mach-mediatek ARM: mediatek: Replace <linux/clk-provider.h> by <linux/of_clk.h> 2020-05-15 22:55:06 +02:00
mach-meson
mach-milbeaut
mach-mmp This time around we have 4 lines of diff in the core framework, removing a 2020-06-10 11:42:19 -07:00
mach-moxart
mach-mv78xx0
mach-mvebu ARM: mvebu: Drop unneeded select of HAVE_SMP 2020-05-15 23:27:38 +02:00
mach-mxs
mach-nomadik
mach-npcm
mach-nspire
mach-omap1 ARM: SoC updates 2020-04-03 15:02:35 -07:00
mach-omap2 ARM: DT changes for v5.8 2020-06-04 20:02:14 -07:00
mach-orion5x
mach-oxnas ARM: oxnas: make ox820_boot_secondary static 2020-05-12 10:29:33 +02:00
mach-picoxcell
mach-prima2 ARM: prima2: Drop unneeded select of HAVE_SMP 2020-05-15 23:27:38 +02:00
mach-pxa ARM: pxa: remove Compulab pxa2xx boards 2020-05-26 00:10:57 +02:00
mach-qcom ARM: qcom: Add support for IPQ40xx 2020-03-31 21:03:27 +02:00
mach-rda
mach-realtek ARM: Prepare Realtek RTD1195 2020-04-12 23:13:38 +02:00
mach-realview VExpress modularization 2020-05-15 23:04:40 +02:00
mach-rockchip ARM: rockchip: fix spelling mistake "to" -> "too" 2020-04-13 09:40:45 +02:00
mach-rpc ARM: 8966/1: rpc: replace setup_irq() by request_irq() 2020-03-19 09:27:42 +00:00
mach-s3c24xx backlight: pwm_bl: Switch to full GPIO descriptor 2020-03-18 15:05:57 +00:00
mach-s3c64xx ARM: s3c64xx: convert to use i2c_new_client_device() 2020-04-13 12:28:23 +02:00
mach-s5pv210
mach-sa1100 mm: pgtable: add shortcuts for accessing kernel PMD and PTE 2020-06-09 09:39:13 -07:00
mach-shmobile ARM: shmobile: r8a7742: Basic SoC support 2020-04-28 10:13:58 +02:00
mach-socfpga ARM: socfpga: Drop unneeded select of PCI_DOMAINS_GENERIC 2020-05-15 23:27:38 +02:00
mach-spear ARM: spear: replace setup_irq() by request_irq() 2020-03-27 14:11:45 +01:00
mach-sti
mach-stm32
mach-sunxi
mach-tango
mach-tegra mm: introduce include/linux/pgtable.h 2020-06-09 09:39:13 -07:00
mach-u300
mach-uniphier
mach-ux500
mach-versatile VExpress modularization 2020-05-15 23:04:40 +02:00
mach-vexpress Revert "ARM: vexpress: Don't select VEXPRESS_CONFIG" 2020-05-28 12:30:33 +02:00
mach-vt8500 ARM: Remove redundant CLKDEV_LOOKUP selects 2020-05-05 12:33:57 -07:00
mach-zx
mach-zynq mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
mm mmap locking API: convert mmap_sem comments 2020-06-09 09:39:14 -07:00
net bpf, arm: Optimize ALU ARSH K using asr immediate instruction 2020-05-04 17:04:42 +02:00
nwfpe
oprofile
plat-omap
plat-orion ARM: orion: replace setup_irq() by request_irq() 2020-03-13 21:37:15 +01:00
plat-pxa
plat-samsung ARM: samsung: Use devm_platform_ioremap_resource() to simplify code 2020-04-21 11:35:00 +02:00
plat-versatile ARM: versatile: Remove dead sched_clock code 2020-04-16 13:02:17 +02:00
probes
tools vfs: add faccessat2 syscall 2020-05-14 16:44:25 +02:00
vdso .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
vfp
xen arm/xen: make _xen_start_info static 2020-04-17 07:45:12 +02:00
Kconfig ARM: 8984/1: Kconfig: set default ZBOOT_ROM_TEXT/BSS value to 0x0 2020-06-13 11:11:17 +01:00
Kconfig-nommu
Kconfig.debug ARM: debug-ll: Add support for r8a7742 2020-05-04 14:28:21 +02:00
Makefile Kbuild updates for v5.8 2020-06-06 12:00:25 -07:00