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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI updates from Rafael Wysocki:
"These include new ACPICA material, a rework of the ACPI thermal
driver, a switch-over of the ACPI processor driver to using _OSC
instead of (long deprecated) _PDC for CPU initialization, a rework of
firmware notifications handling in several drivers, fixes and cleanups
for suspend-to-idle handling on AMD systems, ACPI backlight driver
updates and more.
Specifics:
- Update the ACPICA code in the kernel to upstream revision 20230628
including the following changes:
- Suppress a GCC 12 dangling-pointer warning (Philip Prindeville)
- Reformat the ACPI_STATE_COMMON macro and its users (George Guo)
- Replace the ternary operator with ACPI_MIN() (Jiangshan Yi)
- Add support for _DSC as per ACPI 6.5 (Saket Dumbre)
- Remove a duplicate macro from zephyr header (Najumon B.A)
- Add data structures for GED and _EVT tracking (Jose Marinho)
- Fix misspelled CDAT DSMAS define (Dave Jiang)
- Simplify an error message in acpi_ds_result_push() (Christophe
Jaillet)
- Add a struct size macro related to SRAT (Dave Jiang)
- Add AML_NO_OPERAND_RESOLVE flag to Timer (Abhishek Mainkar)
- Add support for RISC-V external interrupt controllers in MADT
(Sunil V L)
- Add RHCT flags, CMO and MMU nodes (Sunil V L)
- Change ACPICA version to 20230628 (Bob Moore)
- Introduce new wrappers for ACPICA notify handler install/remove and
convert multiple drivers to using their own Notify() handlers
instead of the ACPI bus type .notify() slated for removal (Michal
Wilczynski)
- Add backlight=native DMI quirk for Apple iMac12,1 and iMac12,2
(Hans de Goede)
- Put ACPI video and its child devices explicitly into D0 on boot to
avoid platform firmware confusion (Kai-Heng Feng)
- Add backlight=native DMI quirk for Lenovo Ideapad Z470 (Jiri Slaby)
- Support obtaining physical CPU ID from MADT on LoongArch (Bibo Mao)
- Convert ACPI CPU initialization to using _OSC instead of _PDC that
has been depreceted since 2018 and dropped from the specification
in ACPI 6.5 (Michal Wilczynski, Rafael Wysocki)
- Drop non-functional nocrt parameter from ACPI thermal (Mario
Limonciello)
- Clean up the ACPI thermal driver, rework the handling of firmware
notifications in it and make it provide a table of generic trip
point structures to the core during initialization (Rafael Wysocki)
- Defer enumeration of devices with _DEP pointing to IVSC (Wentong
Wu)
- Install SystemCMOS address space handler for ACPI000E (TAD) to meet
platform firmware expectations on some platforms (Zhang Rui)
- Fix finding the generic error data in the ACPi extlog driver for
compatibility with old and new firmware interface versions
(Xiaochun Lee)
- Remove assorted unused declarations of functions (Yue Haibing)
- Move AMBA bus scan handling into arm64 specific directory (Sudeep
Holla)
- Fix and clean up suspend-to-idle interface for AMD systems (Mario
Limonciello, Andy Shevchenko)
- Fix string truncation warning in pnpacpi_add_device() (Sunil V L)"
* tag 'acpi-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (66 commits)
ACPI: x86: s2idle: Add a function to get LPS0 constraint for a device
ACPI: x86: s2idle: Add for_each_lpi_constraint() helper
ACPI: x86: s2idle: Add more debugging for AMD constraints parsing
ACPI: x86: s2idle: Fix a logic error parsing AMD constraints table
ACPI: x86: s2idle: Catch multiple ACPI_TYPE_PACKAGE objects
ACPI: x86: s2idle: Post-increment variables when getting constraints
ACPI: Adjust #ifdef for *_lps0_dev use
ACPI: TAD: Install SystemCMOS address space handler for ACPI000E
ACPI: Remove assorted unused declarations of functions
ACPI: extlog: Fix finding the generic error data for v3 structure
PNP: ACPI: Fix string truncation warning
ACPI: Remove unused extern declaration acpi_paddr_to_node()
ACPI: video: Add backlight=native DMI quirk for Apple iMac12,1 and iMac12,2
ACPI: video: Put ACPI video and its child devices into D0 on boot
ACPI: processor: LoongArch: Get physical ID from MADT
ACPI: scan: Defer enumeration of devices with a _DEP pointing to IVSC device
ACPI: thermal: Eliminate code duplication from acpi_thermal_notify()
ACPI: thermal: Drop unnecessary thermal zone callbacks
ACPI: thermal: Rework thermal_get_trend()
ACPI: thermal: Use trip point table to register thermal zones
...
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git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen updates from Juergen Gross:
- a bunch of minor cleanups
- a patch adding irqfd support for virtio backends running as user
daemon supporting Xen guests
* tag 'for-linus-6.6-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen: privcmd: Add support for irqfd
xen/xenbus: Avoid a lockdep warning when adding a watch
xen: Fix one kernel-doc comment
xen: xenbus: Use helper function IS_ERR_OR_NULL()
xen: Switch to use kmemdup() helper
xen-pciback: Remove unused function declarations
x86/xen: Make virt_to_pfn() a static inline
xen: remove a confusing comment on auto-translated guest I/O
xen/evtchn: Remove unused function declaration xen_set_affinity_evtchn()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull misc x86 cleanups from Ingo Molnar:
"The following commit deserves special mention:
22dc02f81cddd Revert "sched/fair: Move unused stub functions to header"
This is in x86/cleanups, because the revert is a re-application of a
number of cleanups that got removed inadvertedly"
[ This also effectively undoes the amd_check_microcode() microcode
declaration change I had done in my microcode loader merge in commit
42a7f6e3ffe0 ("Merge tag 'x86_microcode_for_v6.6_rc1' [...]").
I picked the declaration change by Arnd from this branch instead,
which put it in <asm/processor.h> instead of <asm/microcode.h> like I
had done in my merge resolution - Linus ]
* tag 'x86-cleanups-2023-08-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/platform/uv: Refactor code using deprecated strncpy() interface to use strscpy()
x86/hpet: Refactor code using deprecated strncpy() interface to use strscpy()
x86/platform/uv: Refactor code using deprecated strcpy()/strncpy() interfaces to use strscpy()
x86/qspinlock-paravirt: Fix missing-prototype warning
x86/paravirt: Silence unused native_pv_lock_init() function warning
x86/alternative: Add a __alt_reloc_selftest() prototype
x86/purgatory: Include header for warn() declaration
x86/asm: Avoid unneeded __div64_32 function definition
Revert "sched/fair: Move unused stub functions to header"
x86/apic: Hide unused safe_smp_processor_id() on 32-bit UP
x86/cpu: Fix amd_check_microcode() declaration
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf event updates from Ingo Molnar:
- AMD IBS improvements
- Intel PMU driver updates
- Extend core perf facilities & the ARM PMU driver to better handle ARM big.LITTLE events
- Micro-optimize software events and the ring-buffer code
- Misc cleanups & fixes
* tag 'perf-core-2023-08-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/uncore: Remove unnecessary ?: operator around pcibios_err_to_errno() call
perf/x86/intel: Add Crestmont PMU
x86/cpu: Update Hybrids
x86/cpu: Fix Crestmont uarch
x86/cpu: Fix Gracemont uarch
perf: Remove unused extern declaration arch_perf_get_page_size()
perf: Remove unused PERF_PMU_CAP_HETEROGENEOUS_CPUS capability
arm_pmu: Remove unused PERF_PMU_CAP_HETEROGENEOUS_CPUS capability
perf/x86: Remove unused PERF_PMU_CAP_HETEROGENEOUS_CPUS capability
arm_pmu: Add PERF_PMU_CAP_EXTENDED_HW_TYPE capability
perf/x86/ibs: Set mem_lvl_num, mem_remote and mem_hops for data_src
perf/mem: Add PERF_MEM_LVLNUM_NA to PERF_MEM_NA
perf/mem: Introduce PERF_MEM_LVLNUM_UNC
perf/ring_buffer: Use local_try_cmpxchg in __perf_output_begin
locking/arch: Avoid variable shadowing in local_try_cmpxchg()
perf/core: Use local64_try_cmpxchg in perf_swevent_set_period
perf/x86: Use local64_try_cmpxchg
perf/amd: Prevent grouping of IBS events
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git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi
Pull EFI updates from Ard Biesheuvel:
"This primarily covers some cleanup work on the EFI runtime wrappers,
which are shared between all EFI architectures except Itanium, and
which provide some level of isolation to prevent faults occurring in
the firmware code (which runs at the same privilege level as the
kernel) from bringing down the system.
Beyond that, there is a fix that did not make it into v6.5, and some
doc fixes and dead code cleanup.
- one bugfix for x86 mixed mode that did not make it into v6.5
- first pass of cleanup for the EFI runtime wrappers
- some cosmetic touchups"
* tag 'efi-next-for-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi:
x86/efistub: Fix PCI ROM preservation in mixed mode
efi/runtime-wrappers: Clean up white space and add __init annotation
acpi/prmt: Use EFI runtime sandbox to invoke PRM handlers
efi/runtime-wrappers: Don't duplicate setup/teardown code
efi/runtime-wrappers: Remove duplicated macro for service returning void
efi/runtime-wrapper: Move workqueue manipulation out of line
efi/runtime-wrappers: Use type safe encapsulation of call arguments
efi/riscv: Move EFI runtime call setup/teardown helpers out of line
efi/arm64: Move EFI runtime call setup/teardown helpers out of line
efi/riscv: libstub: Fix comment about absolute relocation
efi: memmap: Remove kernel-doc warnings
efi: Remove unused extern declaration efi_lookup_mapped_addr()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 microcode loading updates from Borislav Petkov:
"The first, cleanup part of the microcode loader reorg tglx has been
working on. The other part wasn't fully ready in time so it will
follow on later.
This part makes the loader core code as it is practically enabled on
pretty much every baremetal machine so there's no need to have the
Kconfig items.
In addition, there are cleanups which prepare for future feature
enablement"
* tag 'x86_microcode_for_v6.6_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/microcode: Remove remaining references to CONFIG_MICROCODE_AMD
x86/microcode/intel: Remove pointless mutex
x86/microcode/intel: Remove debug code
x86/microcode: Move core specific defines to local header
x86/microcode/intel: Rename get_datasize() since its used externally
x86/microcode: Make reload_early_microcode() static
x86/microcode: Include vendor headers into microcode.h
x86/microcode/intel: Move microcode functions out of cpu/intel.c
x86/microcode: Hide the config knob
x86/mm: Remove unused microcode.h include
x86/microcode: Remove microcode_mutex
x86/microcode/AMD: Rip out static buffers
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 SEV updates from Borislav Petkov:
- Handle the case where the beginning virtual address of the address
range whose SEV encryption status needs to change, is not page
aligned so that callers which round up the number of pages to be
decrypted, would mark a trailing page as decrypted and thus cause
corruption during live migration.
- Return an error from the #VC handler on AMD SEV-* guests when the
debug registers swapping is enabled as a DR7 access should not happen
then - that register is guest/host switched.
* tag 'x86_sev_for_v6.6_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/sev: Make enc_dec_hypercall() accept a size instead of npages
x86/sev: Do not handle #VC for DR7 read/write
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 boot updates from Borislav Petkov:
"Avoid the baremetal decompressor code when booting on an EFI machine.
This is mandated by the current tightening of EFI executables
requirements when used in a secure boot scenario. More specifically,
an EFI executable cannot have a single section with RWX permissions,
which conflicts with the in-place kernel decompression that is done
today.
Instead, the things required by the booting kernel image are done in
the EFI stub now.
Work by Ard Biesheuvel"
* tag 'x86_boot_for_v6.6_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits)
x86/efistub: Avoid legacy decompressor when doing EFI boot
x86/efistub: Perform SNP feature test while running in the firmware
efi/libstub: Add limit argument to efi_random_alloc()
x86/decompressor: Factor out kernel decompression and relocation
x86/decompressor: Move global symbol references to C code
decompress: Use 8 byte alignment
x86/efistub: Prefer EFI memory attributes protocol over DXE services
x86/efistub: Perform 4/5 level paging switch from the stub
x86/decompressor: Merge trampoline cleanup with switching code
x86/decompressor: Pass pgtable address to trampoline directly
x86/decompressor: Only call the trampoline when changing paging levels
x86/decompressor: Call trampoline directly from C code
x86/decompressor: Avoid the need for a stack in the 32-bit trampoline
x86/decompressor: Use standard calling convention for trampoline
x86/decompressor: Call trampoline as a normal function
x86/decompressor: Assign paging related global variables earlier
x86/decompressor: Store boot_params pointer in callee save register
x86/efistub: Clear BSS in EFI handover protocol entrypoint
x86/decompressor: Avoid magic offsets for EFI handover entrypoint
x86/efistub: Simplify and clean up handover entry code
...
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull CPU hotplug updates from Thomas Gleixner:
"Updates for the CPU hotplug core:
- Support partial SMT enablement.
So far the sysfs SMT control only allows to toggle between SMT on
and off. That's sufficient for x86 which usually has at max two
threads except for the Xeon PHI platform which has four threads per
core
Though PowerPC has up to 16 threads per core and so far it's only
possible to control the number of enabled threads per core via a
command line option. There is some way to control this at runtime,
but that lacks enforcement and the usability is awkward
This update expands the sysfs interface and the core infrastructure
to accept numerical values so PowerPC can build SMT runtime control
for partial SMT enablement on top
The core support has also been provided to the PowerPC maintainers
who added the PowerPC related changes on top
- Minor cleanups and documentation updates"
* tag 'smp-core-2023-08-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
Documentation: core-api/cpuhotplug: Fix state names
cpu/hotplug: Remove unused function declaration cpu_set_state_online()
cpu/SMT: Fix cpu_smt_possible() comment
cpu/SMT: Allow enabling partial SMT states via sysfs
cpu/SMT: Create topology_smt_thread_allowed()
cpu/SMT: Remove topology_smt_supported()
cpu/SMT: Store the current/max number of threads
cpu/SMT: Move smt/control simple exit cases earlier
cpu/SMT: Move SMT prototypes into cpu_smt.h
cpu/hotplug: Remove dependancy against cpu_primary_thread_mask
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Merge ACPI processor driver changes for 6.6-rc1:
- Support obtaining physical CPU ID from MADT on LoongArch (Bibo Mao).
- Convert ACPI CPU initialization to using _OSC instead of _PDC that
has been depreceted since 2018 and dropped from the specification in
ACPI 6.5 (Michal Wilczynski, Rafael Wysocki).
* acpi-processor:
ACPI: processor: LoongArch: Get physical ID from MADT
ACPI: processor: Refine messages in acpi_early_processor_control_setup()
ACPI: processor: Remove acpi_hwp_native_thermal_lvt_osc()
ACPI: processor: Use _OSC to convey OSPM processor support information
ACPI: processor: Introduce acpi_processor_osc()
ACPI: processor: Set CAP_SMP_T_SWCOORD in arch_acpi_set_proc_cap_bits()
ACPI: processor: Clear C_C2C3_FFH and C_C1_FFH in arch_acpi_set_proc_cap_bits()
ACPI: processor: Rename ACPI_PDC symbols
ACPI: processor: Refactor arch_acpi_set_pdc_bits()
ACPI: processor: Move processor_physically_present() to acpi_processor.c
ACPI: processor: Move MWAIT quirk out of acpi_processor.c
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enc_dec_hypercall() accepted a page count instead of a size, which
forced its callers to round up. As a result, non-page aligned
vaddrs caused pages to be spuriously marked as decrypted via the
encryption status hypercall, which in turn caused consistent
corruption of pages during live migration. Live migration requires
accurate encryption status information to avoid migrating pages
from the wrong perspective.
Fixes: 064ce6c550a0 ("mm: x86: Invoke hypercall when page encryption status is changed")
Signed-off-by: Steve Rutherford <srutherford@google.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Tested-by: Ben Hillier <bhillier@google.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230824223731.2055016-1-srutherford@google.com
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__efi_call_virt() exists as an alternative for efi_call_virt() for the
sole reason that ResetSystem() returns void, and so we cannot use a call
to it in the RHS of an assignment.
Given that there is only a single user, let's drop the macro, and expand
it into the caller. That way, the remaining macro can be tightened
somewhat in terms of type safety too.
Note that the use of typeof() on the runtime service invocation does not
result in an actual call being made, but it does require a few pointer
types to be fixed up and converted into the proper function pointer
prototypes.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
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Making virt_to_pfn() a static inline taking a strongly typed
(const void *) makes the contract of a passing a pointer of that
type to the function explicit and exposes any misuse of the
macro virt_to_pfn() acting polymorphic and accepting many types
such as (void *), (unitptr_t) or (unsigned long) as arguments
without warnings.
Also fix all offending call sites to pass a (void *) rather
than an unsigned long. Since virt_to_mfn() is wrapping
virt_to_pfn() this function has become polymorphic as well
so the usage need to be fixed up.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20230810-virt-to-phys-x86-xen-v1-1-9e966d333e7a@linaro.org
Signed-off-by: Juergen Gross <jgross@suse.com>
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Similar to how it doesn't make sense to have UNTRAIN_RET have two
untrain calls, it also doesn't make sense for VMEXIT to have an extra
IBPB call.
This cures VMEXIT doing potentially unret+IBPB or double IBPB.
Also, the (SEV) VMEXIT case seems to have been overlooked.
Redefine the meaning of the synthetic IBPB flags to:
- ENTRY_IBPB -- issue IBPB on entry (was: entry + VMEXIT)
- IBPB_ON_VMEXIT -- issue IBPB on VMEXIT
And have 'retbleed=ibpb' set *BOTH* feature flags to ensure it retains
the previous behaviour and issues IBPB on entry+VMEXIT.
The new 'srso=ibpb_vmexit' option only sets IBPB_ON_VMEXIT.
Create UNTRAIN_RET_VM specifically for the VMEXIT case, and have that
check IBPB_ON_VMEXIT.
All this avoids having the VMEXIT case having to check both ENTRY_IBPB
and IBPB_ON_VMEXIT and simplifies the alternatives.
Fixes: fb3bd914b3ec ("x86/srso: Add a Speculative RAS Overflow mitigation")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230814121149.109557833@infradead.org
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Since there can only be one active return_thunk, there only needs be
one (matching) untrain_ret. It fundamentally doesn't make sense to
allow multiple untrain_ret at the same time.
Fold all the 3 different untrain methods into a single (temporary)
helper stub.
Fixes: fb3bd914b3ec ("x86/srso: Add a Speculative RAS Overflow mitigation")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230814121149.042774962@infradead.org
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For a more consistent namespace.
[ bp: Fixup names in the doc too. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230814121148.976236447@infradead.org
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Rename the original retbleed return thunk and untrain_ret to
retbleed_return_thunk() and retbleed_untrain_ret().
No functional changes.
Suggested-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230814121148.909378169@infradead.org
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Use the existing configurable return thunk. There is absolute no
justification for having created this __x86_return_thunk alternative.
To clarify, the whole thing looks like:
Zen3/4 does:
srso_alias_untrain_ret:
nop2
lfence
jmp srso_alias_return_thunk
int3
srso_alias_safe_ret: // aliasses srso_alias_untrain_ret just so
add $8, %rsp
ret
int3
srso_alias_return_thunk:
call srso_alias_safe_ret
ud2
While Zen1/2 does:
srso_untrain_ret:
movabs $foo, %rax
lfence
call srso_safe_ret (jmp srso_return_thunk ?)
int3
srso_safe_ret: // embedded in movabs instruction
add $8,%rsp
ret
int3
srso_return_thunk:
call srso_safe_ret
ud2
While retbleed does:
zen_untrain_ret:
test $0xcc, %bl
lfence
jmp zen_return_thunk
int3
zen_return_thunk: // embedded in the test instruction
ret
int3
Where Zen1/2 flush the BTB entry using the instruction decoder trick
(test,movabs) Zen3/4 use BTB aliasing. SRSO adds a return sequence
(srso_safe_ret()) which forces the function return instruction to
speculate into a trap (UD2). This RET will then mispredict and
execution will continue at the return site read from the top of the
stack.
Pick one of three options at boot (evey function can only ever return
once).
[ bp: Fixup commit message uarch details and add them in a comment in
the code too. Add a comment about the srso_select_mitigation()
dependency on retbleed_select_mitigation(). Add moar ifdeffery for
32-bit builds. Add a dummy srso_untrain_ret_alias() definition for
32-bit alternatives needing the symbol. ]
Fixes: fb3bd914b3ec ("x86/srso: Add a Speculative RAS Overflow mitigation")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230814121148.842775684@infradead.org
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There is infrastructure to rewrite return thunks to point to any
random thunk one desires, unwrap that from CALL_THUNKS, which up to
now was the sole user of that.
[ bp: Make the thunks visible on 32-bit and add ifdeffery for the
32-bit builds. ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230814121148.775293785@infradead.org
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retpolines and IBT
The kprobes optimization check can_optimize() calls
insn_is_indirect_jump() to detect indirect jump instructions in
a target function. If any is found, creating an optprobe is disallowed
in the function because the jump could be from a jump table and could
potentially land in the middle of the target optprobe.
With retpolines, insn_is_indirect_jump() additionally looks for calls to
indirect thunks which the compiler potentially used to replace original
jumps. This extra check is however unnecessary because jump tables are
disabled when the kernel is built with retpolines. The same is currently
the case with IBT.
Based on this observation, remove the logic to look for calls to
indirect thunks and skip the check for indirect jumps altogether if the
kernel is built with retpolines or IBT. Remove subsequently the symbols
__indirect_thunk_start and __indirect_thunk_end which are no longer
needed.
Dropping this logic indirectly fixes a problem where the range
[__indirect_thunk_start, __indirect_thunk_end] wrongly included also the
return thunk. It caused that machines which used the return thunk as
a mitigation and didn't have it patched by any alternative ended up not
being able to use optprobes in any regular function.
Fixes: 0b53c374b9ef ("x86/retpoline: Use -mfunction-return")
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Suggested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20230711091952.27944-3-petr.pavlu@suse.com
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Initially, it was thought that doing an innocuous division in the #DE
handler would take care to prevent any leaking of old data from the
divider but by the time the fault is raised, the speculation has already
advanced too far and such data could already have been used by younger
operations.
Therefore, do the innocuous division on every exit to userspace so that
userspace doesn't see any potentially old data from integer divisions in
kernel space.
Do the same before VMRUN too, to protect host data from leaking into the
guest too.
Fixes: 77245f1c3c64 ("x86/CPU/AMD: Do not leak quotient data after a division by 0")
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/20230811213824.10025-1-bp@alien8.de
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There is no reason to expose all of this globally. Move everything which is
not required outside of the microcode specific code to local header files
and into the respective source files.
No functional change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230812195727.952876381@linutronix.de
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Rename get_datasize() to intel_microcode_get_datasize() and make it an inline.
[ tglx: Make the argument typed and fix up the IFS code ]
Suggested-by: Boris Petkov <bp@alien8.de>
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230812195727.894165745@linutronix.de
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fe055896c040 ("x86/microcode: Merge the early microcode loader") left this
needlessly public. Git archaeology provided by Borislav.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230812195727.834943153@linutronix.de
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Currently vendor specific headers are included explicitly when used in
common code. Instead, include the vendor specific headers in
microcode.h, and include that in all usages.
No functional change.
Suggested-by: Boris Petkov <bp@alien8.de>
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230812195727.776541545@linutronix.de
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There is really no point to have that in the CPUID evaluation code. Move it
into the Intel-specific microcode handling along with the data
structures, defines and helpers required by it. The exports need to stay
for IFS.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230812195727.719202319@linutronix.de
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In reality CONFIG_MICROCODE is enabled in any reasonable configuration when
Intel or AMD support is enabled. Accommodate to reality.
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230812195727.660453052@linutronix.de
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The only remaining consumer is new_inode, where it showed up in 2001 as
commit c37fa164f793 ("v2.4.9.9 -> v2.4.9.10") in a historical repo [1]
with a changelog which does not mention it.
Since then the line got only touched up to keep compiling.
While it may have been of benefit back in the day, it is guaranteed to
at best not get in the way in the multicore setting -- as the code
performs *a lot* of work between the prefetch and actual lock acquire,
any contention means the cacheline is already invalid by the time the
routine calls spin_lock(). It adds spurious traffic, for short.
On top of it prefetch is notoriously tricky to use for single-threaded
purposes, making it questionable from the get go.
As such, remove it.
I admit upfront I did not see value in benchmarking this change, but I
can do it if that is deemed appropriate.
Removal from new_inode and of the entire thing are in the same patch as
requested by Linus, so whatever weird looks can be directed at that guy.
Link: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/fs/inode.c?id=c37fa164f793735b32aa3f53154ff1a7659e6442 [1]
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Borislav Petkov:
- Do not parse the confidential computing blob on non-AMD hardware as
it leads to an EFI config table ending up unmapped
- Use the correct segment selector in the 32-bit version of getcpu() in
the vDSO
- Make sure vDSO and VVAR regions are placed in the 47-bit VA range
even on 5-level paging systems
- Add models 0x90-0x91 to the range of AMD Zenbleed-affected CPUs
* tag 'x86_urgent_for_v6.5_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/cpu/amd: Enable Zenbleed fix for AMD Custom APU 0405
x86/mm: Fix VDSO and VVAR placement on 5-level paging machines
x86/linkage: Fix typo of BUILD_VDSO in asm/linkage.h
x86/vdso: Choose the right GDT_ENTRY_CPUNODE for 32-bit getcpu() on 64-bit kernel
x86/sev: Do not try to parse for the CC blob on non-AMD hardware
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 mitigation fixes from Borislav Petkov:
"The first set of fallout fixes after the embargo madness. There will
be another set next week too.
- A first series of cleanups/unifications and documentation
improvements to the SRSO and GDS mitigations code which got
postponed to after the embargo date
- Fix the SRSO aliasing addresses assertion so that the LLVM linker
can parse it too"
* tag 'x86_bugs_for_v6.5_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
driver core: cpu: Fix the fallback cpu_show_gds() name
x86: Move gds_ucode_mitigated() declaration to header
x86/speculation: Add cpu_show_gds() prototype
driver core: cpu: Make cpu_show_not_affected() static
x86/srso: Fix build breakage with the LLVM linker
Documentation/srso: Document IBPB aspect and fix formatting
driver core: cpu: Unify redundant silly stubs
Documentation/hw-vuln: Unify filename specification in index
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI fixes from Rafael Wysocki:
"Rework the handling of interrupt overrides on AMD Zen-based machines
to avoid recently introduced regressions (Hans de Goede).
Note that this is intended as a short-term mitigation for 6.5 and the
long-term approach will be to attempt to use the configuration left by
the BIOS, but it requires more investigation"
* tag 'acpi-6.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI: resource: Add IRQ override quirk for PCSpecialist Elimina Pro 16 M
ACPI: resource: Honor MADT INT_SRC_OVR settings for IRQ1 on AMD Zen
ACPI: resource: Always use MADT override IRQ settings for all legacy non i8042 IRQs
ACPI: resource: revert "Remove "Zen" specific match and quirks"
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The declaration got placed in the .c file of the caller, but that
causes a warning for the definition:
arch/x86/kernel/cpu/bugs.c:682:6: error: no previous prototype for 'gds_ucode_mitigated' [-Werror=missing-prototypes]
Move it to a header where both sides can observe it instead.
Fixes: 81ac7e5d74174 ("KVM: Add GDS_NO support to KVM")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Cc: stable@kernel.org
Link: https://lore.kernel.org/all/20230809130530.1913368-2-arnd%40kernel.org
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Give the hybrid thingies their own section, appropriately between Core
and Atom.
Add the Raptor Lake uarch names.
Put Lunar Lake after Arrow Lake per interweb guidance.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230807150405.828551866@infradead.org
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Sierra Forest and Grand Ridge are both E-core only using Crestmont
micro-architecture, They fit the pre-existing naming scheme prefectly
fine, adhere to it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230807150405.757666627@infradead.org
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Alderlake N is an E-core only product using Gracemont
micro-architecture. It fits the pre-existing naming scheme perfectly
fine, adhere to it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230807150405.686834933@infradead.org
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On AMD Zen acpi_dev_irq_override() by default prefers the DSDT IRQ 1
settings over the MADT settings.
This causes the keyboard to malfunction on some laptop models
(see Links), all models from the Links have an INT_SRC_OVR MADT entry
for IRQ 1.
Fixes: a9c4a912b7dc ("ACPI: resource: Remove "Zen" specific match and quirks")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217336
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217394
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217406
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Under certain circumstances, an integer division by 0 which faults, can
leave stale quotient data from a previous division operation on Zen1
microarchitectures.
Do a dummy division 0/1 before returning from the #DE exception handler
in order to avoid any leaks of potentially sensitive data.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The BUILD_VDSO macro was incorrectly spelled as BULID_VDSO in
asm/linkage.h. This causes the !defined(BULID_VDSO) directive to always
evaluate to true.
Correct the spelling to BUILD_VDSO.
Fixes: bea75b33895f ("x86/Kconfig: Introduce function padding")
Signed-off-by: Jinghao Jia <jinghao@linux.ibm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/20230808182353.76218-1-jinghao@linux.ibm.com
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kernel
The vDSO getcpu() reads CPU ID from the GDT_ENTRY_CPUNODE entry when the RDPID
instruction is not available. And GDT_ENTRY_CPUNODE is defined as 28 on 32-bit
Linux kernel and 15 on 64-bit. But the 32-bit getcpu() on 64-bit Linux kernel
is compiled with 32-bit Linux kernel GDT_ENTRY_CPUNODE, i.e., 28, beyond the
64-bit Linux kernel GDT limit. Thus, it just fails _silently_.
When BUILD_VDSO32_64 is defined, choose the 64-bit Linux kernel GDT definitions
to compile the 32-bit getcpu().
Fixes: 877cff5296faa6e ("x86/vdso: Fake 32bit VDSO build on 64bit compile for vgetcpu")
Reported-by: kernel test robot <yujie.liu@intel.com>
Reported-by: Shan Kang <shan.kang@intel.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230322061758.10639-1-xin3.li@intel.com
Link: https://lore.kernel.org/oe-lkp/202303020903.b01fd1de-yujie.liu@intel.com
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86/gds fixes from Dave Hansen:
"Mitigate Gather Data Sampling issue:
- Add Base GDS mitigation
- Support GDS_NO under KVM
- Fix a documentation typo"
* tag 'gds-for-linus-2023-08-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
Documentation/x86: Fix backwards on/off logic about YMM support
KVM: Add GDS_NO support to KVM
x86/speculation: Add Kconfig option for GDS
x86/speculation: Add force option to GDS mitigation
x86/speculation: Add Gather Data Sampling mitigation
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86/srso fixes from Borislav Petkov:
"Add a mitigation for the speculative RAS (Return Address Stack)
overflow vulnerability on AMD processors.
In short, this is yet another issue where userspace poisons a
microarchitectural structure which can then be used to leak privileged
information through a side channel"
* tag 'x86_bugs_srso' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/srso: Tie SBPB bit setting to microcode patch detection
x86/srso: Add a forgotten NOENDBR annotation
x86/srso: Fix return thunks in generated code
x86/srso: Add IBPB on VMEXIT
x86/srso: Add IBPB
x86/srso: Add SRSO_NO support
x86/srso: Add IBPB_BRTYPE support
x86/srso: Add a Speculative RAS Overflow mitigation
x86/bugs: Increase the x86 bugs vector size to two u32s
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The bare metal decompressor code was never really intended to run in a
hosted environment such as the EFI boot services, and does a few things
that are becoming problematic in the context of EFI boot now that the
logo requirements are getting tighter: EFI executables will no longer be
allowed to consist of a single executable section that is mapped with
read, write and execute permissions if they are intended for use in a
context where Secure Boot is enabled (and where Microsoft's set of
certificates is used, i.e., every x86 PC built to run Windows).
To avoid stepping on reserved memory before having inspected the E820
tables, and to ensure the correct placement when running a kernel build
that is non-relocatable, the bare metal decompressor moves its own
executable image to the end of the allocation that was reserved for it,
in order to perform the decompression in place. This means the region in
question requires both write and execute permissions, which either need
to be given upfront (which EFI will no longer permit), or need to be
applied on demand using the existing page fault handling framework.
However, the physical placement of the kernel is usually randomized
anyway, and even if it isn't, a dedicated decompression output buffer
can be allocated anywhere in memory using EFI APIs when still running in
the boot services, given that EFI support already implies a relocatable
kernel. This means that decompression in place is never necessary, nor
is moving the compressed image from one end to the other.
Since EFI already maps all of memory 1:1, it is also unnecessary to
create new page tables or handle page faults when decompressing the
kernel. That means there is also no need to replace the special
exception handlers for SEV. Generally, there is little need to do
any of the things that the decompressor does beyond
- initialize SEV encryption, if needed,
- perform the 4/5 level paging switch, if needed,
- decompress the kernel
- relocate the kernel
So do all of this from the EFI stub code, and avoid the bare metal
decompressor altogether.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230807162720.545787-24-ardb@kernel.org
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Before refactoring the EFI stub boot flow to avoid the legacy bare metal
decompressor, duplicate the SNP feature check in the EFI stub before
handing over to the kernel proper.
The SNP feature check can be performed while running under the EFI boot
services, which means it can force the boot to fail gracefully and
return an error to the bootloader if the loaded kernel does not
implement support for all the features that the hypervisor enabled.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230807162720.545787-23-ardb@kernel.org
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Factor out the decompressor sequence that invokes the decompressor,
parses the ELF and applies the relocations so that it can be called
directly from the EFI stub.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230807162720.545787-21-ardb@kernel.org
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git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv fixes from Wei Liu:
- Fix a bug in a python script for Hyper-V (Ani Sinha)
- Workaround a bug in Hyper-V when IBT is enabled (Michael Kelley)
- Fix an issue parsing MP table when Linux runs in VTL2 (Saurabh
Sengar)
- Several cleanup patches (Nischala Yelchuri, Kameron Carr, YueHaibing,
ZhiHu)
* tag 'hyperv-fixes-signed-20230804' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
Drivers: hv: vmbus: Remove unused extern declaration vmbus_ontimer()
x86/hyperv: add noop functions to x86_init mpparse functions
vmbus_testing: fix wrong python syntax for integer value comparison
x86/hyperv: fix a warning in mshyperv.h
x86/hyperv: Disable IBT when hypercall page lacks ENDBR instruction
x86/hyperv: Improve code for referencing hyperv_pcpu_input_arg
Drivers: hv: Change hv_free_hyperv_page() to take void * argument
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__pv_queued_spin_unlock_slowpath() is defined in a header file as
a global function, and designed to be called from inline asm, but
there is no prototype visible in the definition:
kernel/locking/qspinlock_paravirt.h:493:1: error: no previous \
prototype for '__pv_queued_spin_unlock_slowpath' [-Werror=missing-prototypes]
Add this to the x86 header that contains the inline asm calling it,
and ensure this gets included before the definition, rather than
after it.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230803082619.1369127-8-arnd@kernel.org
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The native_pv_lock_init() function is only used in SMP configurations
and declared in asm/qspinlock.h which is not used in UP kernels, but
the function is still defined for both, which causes a warning:
arch/x86/kernel/paravirt.c:76:13: error: no previous prototype for 'native_pv_lock_init' [-Werror=missing-prototypes]
Move the declaration to asm/paravirt.h so it is visible even
with CONFIG_SMP but short-circuit the definition to turn it
into an empty function.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230803082619.1369127-7-arnd@kernel.org
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The __div64_32() function is provided for 32-bit architectures that
don't have a custom do_div() implementation. x86_32 has one, and
does not use the header file that declares the function prototype,
so the definition causes a W=1 warning:
lib/math/div64.c:31:32: error: no previous prototype for '__div64_32' [-Werror=missing-prototypes]
Define an empty macro to prevent the function definition from getting
built, which avoids the warning and saves a little .text space.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230803082619.1369127-4-arnd@kernel.org
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The newly added amd_check_microcode() function has two conflicting definitions
if CONFIG_CPU_SUP_AMD is enabled and CONFIG_MICROCODE_AMD is disabled. Since
the header with the stub definition is not included in cpu/amd.c, this only
causes a -Wmissing-prototype warning with W=1:
arch/x86/kernel/cpu/amd.c:1289:6: error: no previous prototype for 'amd_check_microcode' [-Werror=missing-prototypes]
Adding the missing #include shows the other problem:
arch/x86/kernel/cpu/amd.c:1290:6: error: redefinition of 'amd_check_microcode'
arch/x86/include/asm/microcode_amd.h:58:20: note: previous definition of 'amd_check_microcode' with type 'void(void)'
Move the declaration into a more appropriate header that is already
included, with the #ifdef check changed to match the definition's.
Fixes: 522b1d69219d8 ("x86/cpu/amd: Add a Zenbleed fix")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230725121751.2007665-1-arnd@kernel.org
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Pull kvm fixes from Paolo Bonzini:
"x86:
- Do not register IRQ bypass consumer if posted interrupts not
supported
- Fix missed device interrupt due to non-atomic update of IRR
- Use GFP_KERNEL_ACCOUNT for pid_table in ipiv
- Make VMREAD error path play nice with noinstr
- x86: Acquire SRCU read lock when handling fastpath MSR writes
- Support linking rseq tests statically against glibc 2.35+
- Fix reference count for stats file descriptors
- Detect userspace setting invalid CR0
Non-KVM:
- Remove coccinelle script that has caused multiple confusion
("debugfs, coccinelle: check for obsolete DEFINE_SIMPLE_ATTRIBUTE()
usage", acked by Greg)"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (21 commits)
KVM: selftests: Expand x86's sregs test to cover illegal CR0 values
KVM: VMX: Don't fudge CR0 and CR4 for restricted L2 guest
KVM: x86: Disallow KVM_SET_SREGS{2} if incoming CR0 is invalid
Revert "debugfs, coccinelle: check for obsolete DEFINE_SIMPLE_ATTRIBUTE() usage"
KVM: selftests: Verify stats fd is usable after VM fd has been closed
KVM: selftests: Verify stats fd can be dup()'d and read
KVM: selftests: Verify userspace can create "redundant" binary stats files
KVM: selftests: Explicitly free vcpus array in binary stats test
KVM: selftests: Clean up stats fd in common stats_test() helper
KVM: selftests: Use pread() to read binary stats header
KVM: Grab a reference to KVM for VM and vCPU stats file descriptors
selftests/rseq: Play nice with binaries statically linked against glibc 2.35+
Revert "KVM: SVM: Skip WRMSR fastpath on VM-Exit if next RIP isn't valid"
KVM: x86: Acquire SRCU read lock when handling fastpath MSR writes
KVM: VMX: Use vmread_error() to report VM-Fail in "goto" path
KVM: VMX: Make VMREAD error path play nice with noinstr
KVM: x86/irq: Conditionally register IRQ bypass consumer again
KVM: X86: Use GFP_KERNEL_ACCOUNT for pid_table in ipiv
KVM: x86: check the kvm_cpu_get_interrupt result before using it
KVM: x86: VMX: set irr_pending in kvm_apic_update_irr
...
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