Ard Biesheuvel 3ebd4bd2eb arm64: mm: use a 48-bit ID map when possible on 52-bit VA builds ... [ Upstream commit 7ba8f2b2d6 ] 52-bit VA kernels can run on hardware that is only 48-bit capable, but configure the ID map as 52-bit by default. This was not a problem until recently, because the special T0SZ value for a 52-bit VA space was never programmed into the TCR register anwyay, and because a 52-bit ID map happens to use the same number of translation levels as a 48-bit one. This behavior was changed by commit 1401bef703 ("arm64: mm: Always update TCR_EL1 from __cpu_set_tcr_t0sz()"), which causes the unsupported T0SZ value for a 52-bit VA to be programmed into TCR_EL1. While some hardware simply ignores this, Mark reports that Amberwing systems choke on this, resulting in a broken boot. But even before that commit, the unsupported idmap_t0sz value was exposed to KVM and used to program TCR_EL2 incorrectly as well. Given that we already have to deal with address spaces being either 48-bit or 52-bit in size, the cleanest approach seems to be to simply default to a 48-bit VA ID map, and only switch to a 52-bit one if the placement of the kernel in DRAM requires it. This is guaranteed not to happen unless the system is actually 52-bit VA capable. Fixes: 90ec95cda9 ("arm64: mm: Introduce VA_BITS_MIN") Reported-by: Mark Salter <msalter@redhat.com> Link: http://lore.kernel.org/r/20210310003216.410037-1-msalter@redhat.com Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20210310171515.416643-2-ardb@kernel.org Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-03-17 17:06:34 +01:00
..
probes	arm64: uprobe: Return EOPNOTSUPP for AARCH32 instruction probing	2021-03-04 11:38:36 +01:00
vdso	More arm64 updates for 5.10	2020-10-23 09:46:16 -07:00
vdso32	arm64: vdso32: Allow ld.lld to properly link the VDSO	2020-10-26 13:17:41 +00:00
.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
acpi.c	arm64: permit ACPI core to map kernel memory used for table overrides	2020-09-30 22:27:51 +01:00
acpi_numa.c
acpi_parking_protocol.c
alternative.c	arm64/alternatives: don't patch up internal branches	2020-07-09 14:57:59 +01:00
armv8_deprecated.c	sysctl: pass kernel pointers to ->proc_handler	2020-04-27 02:07:40 -04:00
asm-offsets.c	KVM: arm64: Make struct kvm_regs userspace-only	2020-07-07 09:28:38 +01:00
cacheinfo.c
cpu-reset.h
cpu-reset.S	arm64/relocate_kernel: remove redundant code	2020-09-11 19:06:25 +01:00
cpu_errata.c	arm64: cpu_errata: Apply Erratum 845719 to KRYO2XX Silver	2020-11-13 09:47:08 +00:00
cpu_ops.c	arm64: Introduce get_cpu_ops() helper function	2020-03-24 17:24:19 +00:00
cpufeature.c	arm64: Extend workaround for erratum 1024718 to all versions of Cortex-A55	2021-03-04 11:38:35 +01:00
cpuidle.c	arm64: Introduce get_cpu_ops() helper function	2020-03-24 17:24:19 +00:00
cpuinfo.c	arm64: avoid -Woverride-init warning	2020-10-28 13:38:36 +00:00
crash_core.c	arm64/crash_core: Export TCR_EL1.T1SZ in vmcoreinfo	2020-07-02 17:56:49 +01:00
crash_dump.c
debug-monitors.c	arm64: Improve diagnostics when trapping BRK with FAULT_BRK_IMM	2020-09-18 16:35:54 +01:00
efi-entry.S	arm64 updates for 5.8	2020-06-01 15:18:27 -07:00
efi-header.S	arm64: efi: increase EFI PE/COFF header padding to 64 KB	2020-10-28 14:02:03 +00:00
efi-rt-wrapper.S	Merge branch 'for-next/scs' into for-next/core	2020-05-28 18:03:40 +01:00
efi.c	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
entry-common.c	arm64: entry: fix EL1 debug transitions	2020-11-30 12:11:38 +00:00
entry-fpsimd.S	arm64/sve: Implement a helper to load SVE registers from FPSIMD state	2020-09-21 18:06:33 +01:00
entry-ftrace.S	arm64: entry-ftrace.S: Update comment to indicate that x18 is live	2020-05-18 17:47:50 +01:00
entry.S	arm64: entry: fix non-NMI user<->kernel transitions	2020-11-30 12:11:38 +00:00
fpsimd.c	arm64: reject prctl(PR_PAC_RESET_KEYS) on compat tasks	2020-10-15 10:50:09 +01:00
ftrace.c	arm64: ftrace: Change CONFIG_FTRACE_WITH_REGS to CONFIG_DYNAMIC_FTRACE_WITH_REGS	2020-06-08 15:44:59 +01:00
head.S	arm64: mm: use a 48-bit ID map when possible on 52-bit VA builds	2021-03-17 17:06:34 +01:00
hibernate-asm.S	arm64: kernel: Convert to modern annotations for assembly functions	2020-05-04 12:46:03 +01:00
hibernate.c	Merge branch 'for-next/mte' into for-next/core	2020-10-02 12:16:11 +01:00
hw_breakpoint.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
hyp-stub.S	arm64: kernel: Convert to modern annotations for assembly functions	2020-05-04 12:46:03 +01:00
image-vars.h	KVM/arm64 fixes for 5.10, take #1	2020-10-30 13:25:09 -04:00
image.h	arm64: get rid of TEXT_OFFSET	2020-09-07 15:00:52 +01:00
insn.c	arm64: kprobe: disable probe of fault prone ptrauth instruction	2020-09-14 12:07:02 +01:00
io.c
irq.c	arm64: entry: move el1 irq/nmi logic to C	2020-11-30 12:11:38 +00:00
jump_label.c
kaslr.c	arm64: kaslr: Use standard early random function	2020-08-07 09:10:11 -07:00
kexec_image.c	arm64: kexec_file: Fix sparse warning	2020-11-10 13:11:44 +00:00
kgdb.c	arm64: kgdb: Fix single-step exception handling oops	2020-07-08 22:18:54 +01:00
kuser32.S
machine_kexec.c	arm64: fix the flush_icache_range arguments in machine_kexec	2020-05-11 12:02:14 +01:00
machine_kexec_file.c	arm64: kexec_file: fix memory leakage in create_dtb() when fdt_open_into() fails	2021-03-04 11:38:36 +01:00
Makefile	Merge branch 'for-next/mte' into for-next/core	2020-10-02 12:16:11 +01:00
module-plts.c	arm64/module: set trampoline section flags regardless of CONFIG_DYNAMIC_FTRACE	2020-09-02 08:35:33 +01:00
module.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
mte.c	arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page	2021-02-17 11:02:28 +01:00
paravirt.c	arm64: paravirt: Initialize steal time when cpu is online	2020-09-17 18:12:18 +01:00
pci.c	PCI: Constify struct pci_ecam_ops	2020-05-01 16:28:59 +01:00
perf_callchain.c	arm64: stacktrace: Make stack walk callback consistent with generic code	2020-09-18 14:24:16 +01:00
perf_event.c	arm64: perf: Fix 64-bit event counter read truncation	2021-03-17 17:06:28 +01:00
perf_regs.c	perf/arch: Remove perf_sample_data::regs_user_copy	2020-11-09 18:12:34 +01:00
pointer_auth.c	arm64: reject prctl(PR_PAC_RESET_KEYS) on compat tasks	2020-10-15 10:50:09 +01:00
process.c	arm64 fixes for -rc7	2020-12-02 12:27:37 -08:00
proton-pack.c	arm64: proton-pack: Add KRYO2XX silver CPUs to spectre-v2 safe-list	2020-11-13 09:47:08 +00:00
psci.c	arm64: psci: Avoid printing in cpu_psci_cpu_die()	2020-11-10 13:11:44 +00:00
ptrace.c	arm64: ptrace: Fix seccomp of traced syscall -1 (NO_SYSCALL)	2021-03-04 11:38:32 +01:00
reloc_test_core.c
reloc_test_syms.S	arm64: kernel: Convert to modern annotations for assembly functions	2020-05-04 12:46:03 +01:00
relocate_kernel.S	arm64/relocate_kernel: remove redundant code	2020-09-11 19:06:25 +01:00
return_address.c	arm64: stacktrace: Make stack walk callback consistent with generic code	2020-09-18 14:24:16 +01:00
scs.c	scs: Move DEFINE_SCS macro into core code	2020-05-18 17:47:48 +01:00
sdei.c	arm64: entry: fix NMI {user, kernel}->kernel transitions	2020-11-30 12:11:38 +00:00
setup.c	memblock: use separate iterators for memory and reserved regions	2020-10-13 18:38:35 -07:00
signal.c	arm64: entry: remove redundant IRQ flag tracing	2021-01-27 11:55:07 +01:00
signal32.c	arm64: compat: Always use sigpage for sigreturn trampoline	2020-06-23 14:56:24 +01:00
sigreturn32.S
sleep.S	Merge branch 'for-next/bti' into for-next/core	2020-05-28 18:00:51 +01:00
smccc-call.S	arm64/kernel: Remove needless Call Frame Information annotations	2020-09-01 09:50:36 +02:00
smp.c	arm64: smp: Tell RCU about CPUs that fail to come online	2020-11-10 13:11:44 +00:00
smp_spin_table.c	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
stacktrace.c	arm64: Move console stack display code to stacktrace.c	2020-09-21 19:43:03 +01:00
suspend.c	arm64: spectre: Prevent lockdep splat on v4 mitigation enable path	2021-03-04 11:38:36 +01:00
sys.c
sys32.c
sys_compat.c	arm64: Silence clang warning on mismatched value/register sizes	2019-10-28 09:13:21 +00:00
syscall.c	arm64: entry: remove redundant IRQ flag tracing	2021-01-27 11:55:07 +01:00
time.c	arm64: time: Replace <linux/clk-provider.h> by <linux/of_clk.h>	2020-02-12 17:26:38 +00:00
topology.c	Power management updates for 5.10-rc1	2020-10-14 10:45:41 -07:00
trace-events-emulation.h
traps.c	arm64: entry: fix NMI {user, kernel}->kernel transitions	2020-11-30 12:11:38 +00:00
vdso.c	arm64: vdso: Fix unusual formatting in *setup_additional_pages()	2020-09-01 13:37:57 +01:00
vmlinux.lds.S	arm64: vmlinux.lds: account for spurious empty .igot.plt sections	2020-10-28 13:44:24 +00:00