[pull] master from torvalds:master#121
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pull[bot] merged 24 commits intolambdafunc:masterfrom Mar 31, 2024
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Add a new word for scattered features because all free bits among the existing Linux-defined auxiliary flags have been exhausted. Signed-off-by: Sandipan Das <sandipan.das@amd.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/8380d2a0da469a1f0ad75b8954a79fb689599ff6.1711091584.git.sandipan.das@amd.com
Currently, the LBR code assumes that LBR Freeze is supported on all processors when X86_FEATURE_AMD_LBR_V2 is available i.e. CPUID leaf 0x80000022[EAX] bit 1 is set. This is incorrect as the availability of the feature is additionally dependent on CPUID leaf 0x80000022[EAX] bit 2 being set, which may not be set for all Zen 4 processors. Define a new feature bit for LBR and PMC freeze and set the freeze enable bit (FLBRI) in DebugCtl (MSR 0x1d9) conditionally. It should still be possible to use LBR without freeze for profile-guided optimization of user programs by using an user-only branch filter during profiling. When the user-only filter is enabled, branches are no longer recorded after the transition to CPL 0 upon PMI arrival. When branch entries are read in the PMI handler, the branch stack does not change. E.g. $ perf record -j any,u -e ex_ret_brn_tkn ./workload Since the feature bit is visible under flags in /proc/cpuinfo, it can be used to determine the feasibility of use-cases which require LBR Freeze to be supported by the hardware such as profile-guided optimization of kernels. Fixes: ca5b7c0 ("perf/x86/amd/lbr: Add LbrExtV2 branch record support") Signed-off-by: Sandipan Das <sandipan.das@amd.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/69a453c97cfd11c6f2584b19f937fe6df741510f.1711091584.git.sandipan.das@amd.com
Fix: Documentation/arch/x86/resctrl.rst:577: WARNING: Title underline too short. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Tony Luck <tony.luck@intel.com> Link: https://lore.kernel.org/r/20240325121750.265d655c@canb.auug.org.au
…be mapped." This reverts commit d794734. While the original change tries to fix a bug, it also unintentionally broke existing systems, see the regressions reported at: https://lore.kernel.org/all/3a1b9909-45ac-4f97-ad68-d16ef1ce99db@pavinjoseph.com/ Since d794734 was also marked for -stable, let's back it out before causing more damage. Note that due to another upstream change the revert was not 100% automatic: 0a845e0 mm/treewide: replace pud_large() with pud_leaf() Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: <stable@vger.kernel.org> Cc: Russ Anderson <rja@hpe.com> Cc: Steve Wahl <steve.wahl@hpe.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Link: https://lore.kernel.org/all/3a1b9909-45ac-4f97-ad68-d16ef1ce99db@pavinjoseph.com/ Fixes: d794734 ("x86/mm/ident_map: Use gbpages only where full GB page should be mapped.")
-fsanitize=thread (KCSAN) is at the moment incompatible with named address spaces in a similar way as KASAN - see GCC PR sanitizer/111736: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111736 The patch disables named address spaces with KCSAN. Reported-by: kernel test robot <oliver.sang@intel.com> Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20240325110128.615933-1-ubizjak@gmail.com
An old, invalid record should be cleared and skipped. Currently, the record is cleared in ERST, but it is not skipped. This leads to a NULL pointer dereference when attempting to copy the old record to the new record. Continue the loop after clearing an old, invalid record to skip it. Fixes: 6f15e61 ("RAS: Introduce a FRU memory poison manager") Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Tested-by: Muralidhara M K <muralidhara.mk@amd.com> Link: https://lore.kernel.org/r/20240319113322.280096-2-yazen.ghannam@amd.com
Currently, the size of the locally cached FRU record structures is based on the module parameter "max_nr_entries". This creates issues when restoring records if a user changes the parameter. If the number of entries is reduced, then old, larger records will not be restored. The opportunity to take action on the saved data is missed. Also, new records will be created and written to storage, even as the old records remain in storage, resulting in wasted space. If the number of entries is increased, then the length of the old, smaller records will not be adjusted. This causes a checksum failure which leads to the old record being cleared from storage. Again this results in another missed opportunity for action on the saved data. Allocate the temporary record with the maximum possible size based on the current maximum number of supported entries (255). This allows the ERST read operation to succeed if max_nr_entries has been increased. Warn the user if a saved record exceeds the expected size and fail to load the module. This allows the user to adjust the module parameter without losing data or the opportunity to restore larger records. Increase the size of a saved record up to the current max_rec_len. The checksum will be recalculated, and the updated record will be written to storage. Fixes: 6f15e61 ("RAS: Introduce a FRU memory poison manager") Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Tested-by: Muralidhara M K <muralidhara.mk@amd.com> Link: https://lore.kernel.org/r/20240319113322.280096-3-yazen.ghannam@amd.com
There is a problem when a driver requests a shared interrupt line to run a threaded handler on it without IRQF_ONESHOT set if that flag has been set already for the IRQ in question by somebody else. Namely, the request fails which usually leads to a probe failure even though the driver might have worked just fine with IRQF_ONESHOT, but it does not want to use it by default. Currently, the only way to handle this is to try to request the IRQ without IRQF_ONESHOT, but with IRQF_PROBE_SHARED set and if this fails, try again with IRQF_ONESHOT set. However, this is a bit cumbersome and not very clean. When commit 7a36b90 ("ACPI: OSL: Use a threaded interrupt handler for SCI") switched the ACPI subsystem over to using a threaded interrupt handler for the SCI, it had to use IRQF_ONESHOT for it because that's required due to the way the SCI handler works (it needs to walk all of the enabled GPEs before the interrupt line can be unmasked). The SCI interrupt line is not shared with other users very often due to the SCI handling overhead, but on sone systems it is shared and when the other user of it attempts to install a threaded handler, a flags mismatch related to IRQF_ONESHOT may occur. As it turned out, that happened to the pinctrl-amd driver and so commit 4451e8e ("pinctrl: amd: Add IRQF_ONESHOT to the interrupt request") attempted to address the issue by adding IRQF_ONESHOT to the interrupt flags in that driver, but this is now causing an IRQF_ONESHOT-related mismatch to occur on another system which cannot boot as a result of it. Clearly, pinctrl-amd can work with IRQF_ONESHOT if need be, but it should not set that flag by default, so it needs a way to indicate that to the interrupt subsystem. To that end, introdcuce a new interrupt flag, IRQF_COND_ONESHOT, which will only have effect when the IRQ line is shared and IRQF_ONESHOT has been set for it already, in which case it will be promoted to the latter. This is sufficient for drivers sharing the interrupt line with the SCI as it is requested by the ACPI subsystem before any drivers are probed, so they will always see IRQF_ONESHOT set for the interrupt in question. Fixes: 4451e8e ("pinctrl: amd: Add IRQF_ONESHOT to the interrupt request") Reported-by: Francisco Ayala Le Brun <francisco@videowindow.eu> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Cc: 6.8+ <stable@vger.kernel.org> # 6.8+ Closes: https://lore.kernel.org/lkml/CAN-StX1HqWqi+YW=t+V52-38Mfp5fAz7YHx4aH-CQjgyNiKx3g@mail.gmail.com/ Link: https://lore.kernel.org/r/12417336.O9o76ZdvQC@kreacher
armada_370_xp_msi_reenable_percpu() is only defined when CONFIG_PCI_MSI is
enabled, and only called when SMP is enabled.
Without CONFIG_SMP, there are no callers, which results in a build time
warning instead:
drivers/irqchip/irq-armada-370-xp.c:319:13: error: 'armada_370_xp_msi_reenable_percpu' defined but not used [-Werror=unused-function]
319 | static void armada_370_xp_msi_reenable_percpu(void) {}
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mark the function as __maybe_unused to avoid adding more complexity
to the #ifdefs.
Fixes: 8ca61cd ("irqchip/armada-370-xp: Enable MSI affinity configuration")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20240322125838.901649-1-arnd@kernel.org
…nd later AMD processors based on Zen 2 and later microarchitectures do not support PMCx087 (instruction pipe stalls) which is used as the backing event for "stalled-cycles-frontend" and "stalled-cycles-backend". Use PMCx0A9 (cycles where micro-op queue is empty) instead to count frontend stalls and remove the entry for backend stalls since there is no direct replacement. Signed-off-by: Sandipan Das <sandipan.das@amd.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Ian Rogers <irogers@google.com> Fixes: 3fe3331 ("perf/x86/amd: Add event map for AMD Family 17h") Link: https://lore.kernel.org/r/03d7fc8fa2a28f9be732116009025bdec1b3ec97.1711352180.git.sandipan.das@amd.com
Add the "ref-cycles" event for AMD processors based on Zen 4 and later microarchitectures. The backing event is based on PMCx120 which counts cycles not in halt state in P0 frequency (same as MPERF). Signed-off-by: Sandipan Das <sandipan.das@amd.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Ian Rogers <irogers@google.com> Link: https://lore.kernel.org/r/089155f19f7c7e65aeb1caa727a882e2ca9b8b04.1711352180.git.sandipan.das@amd.com
The commit to improve NMI stall debuggability: 344da54 ("x86/nmi: Print reasons why backtrace NMIs are ignored") ... has shown value, but widespread use has also identified a few opportunities for improvement. The systems have (as usual) shown far more creativity than that commit's author, demonstrating yet again that failing CPUs can do whatever they want. In addition, the current message format is less friendly than one might like to those attempting to use these messages to identify failing CPUs. Therefore, separately flag CPUs that, during the full time that the stack-backtrace request was waiting, were always in an NMI handler, were never in an NMI handler, or exited one NMI handler. Also, split the message identifying the CPU and the time since that CPU's last NMI-related activity so that a single line identifies the CPU without any other variable information, greatly reducing the processing overhead required to identify repeat-offender CPUs. Co-developed-by: Breno Leitao <leitao@debian.org> Signed-off-by: Breno Leitao <leitao@debian.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/ab4d70c8-c874-42dc-b206-643018922393@paulmck-laptop
In a similar fashion to b388e57 ("x86/vdso: Fix rethunk patching for vdso-image-{32,64}.o") annotate vdso-image-x32.o too for objtool so that it gets annotated properly and the unused return thunk warning doesn't fire. Reported-by: kernel test robot <oliver.sang@intel.com> Closes: https://lore.kernel.org/oe-lkp/202403251454.23df6278-lkp@intel.com Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/202403251454.23df6278-lkp@intel.com
SEV-SNP requires encrypted memory to be validated before access. Because the ROM memory range is not part of the e820 table, it is not pre-validated by the BIOS. Therefore, if a SEV-SNP guest kernel wishes to access this range, the guest must first validate the range. The current SEV-SNP code does indeed scan the ROM range during early boot and thus attempts to validate the ROM range in probe_roms(). However, this behavior is neither sufficient nor necessary for the following reasons: * With regards to sufficiency, if EFI_CONFIG_TABLES are not enabled and CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK is set, the kernel will attempt to access the memory at SMBIOS_ENTRY_POINT_SCAN_START (which falls in the ROM range) prior to validation. For example, Project Oak Stage 0 provides a minimal guest firmware that currently meets these configuration conditions, meaning guests booting atop Oak Stage 0 firmware encounter a problematic call chain during dmi_setup() -> dmi_scan_machine() that results in a crash during boot if SEV-SNP is enabled. * With regards to necessity, SEV-SNP guests generally read garbage (which changes across boots) from the ROM range, meaning these scans are unnecessary. The guest reads garbage because the legacy ROM range is unencrypted data but is accessed via an encrypted PMD during early boot (where the PMD is marked as encrypted due to potentially mapping actually-encrypted data in other PMD-contained ranges). In one exceptional case, EISA probing treats the ROM range as unencrypted data, which is inconsistent with other probing. Continuing to allow SEV-SNP guests to use garbage and to inconsistently classify ROM range encryption status can trigger undesirable behavior. For instance, if garbage bytes appear to be a valid signature, memory may be unnecessarily reserved for the ROM range. Future code or other use cases may result in more problematic (arbitrary) behavior that should be avoided. While one solution would be to overhaul the early PMD mapping to always treat the ROM region of the PMD as unencrypted, SEV-SNP guests do not currently rely on data from the ROM region during early boot (and even if they did, they would be mostly relying on garbage data anyways). As a simpler solution, skip the ROM range scans (and the otherwise- necessary range validation) during SEV-SNP guest early boot. The potential SEV-SNP guest crash due to lack of ROM range validation is thus avoided by simply not accessing the ROM range. In most cases, skip the scans by overriding problematic x86_init functions during sme_early_init() to SNP-safe variants, which can be likened to x86_init overrides done for other platforms (ex: Xen); such overrides also avoid the spread of cc_platform_has() checks throughout the tree. In the exceptional EISA case, still use cc_platform_has() for the simplest change, given (1) checks for guest type (ex: Xen domain status) are already performed here, and (2) these checks occur in a subsys initcall instead of an x86_init function. [ bp: Massage commit message, remove "we"s. ] Fixes: 9704c07 ("x86/kernel: Validate ROM memory before accessing when SEV-SNP is active") Signed-off-by: Kevin Loughlin <kevinloughlin@google.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Cc: <stable@kernel.org> Link: https://lore.kernel.org/r/20240313121546.2964854-1-kevinloughlin@google.com
A new helper was introduced for RAS modules to be able to get the RAS subsystem debugfs root directory. The helper is defined in debugfs.c which is only built when CONFIG_DEBUG_FS=y. However, it's possible that the modules would include debugfs support for optional functionality. One current example is the fmpm module. In this case, a build error will occur when CONFIG_RAS_FMPM is selected and CONFIG_DEBUG_FS=n. Add an inline helper function stub for the CONFIG_DEBUG_FS=n case as the fmpm module can function without the debugfs functionality too. Fixes: 9d2b6fa ("RAS: Export helper to get ras_debugfs_dir") Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218640 Reported-by: anthony s. knowles <akira.2020@protonmail.com> Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Tested-by: anthony s. knowles <akira.2020@protonmail.com> Link: https://lore.kernel.org/r/20240325183755.776-1-bp@alien8.de
Anna-Maria and Frederic are working in this area for years. Volunteer them into co-maintainer roles. While at it bring the file lists up to date. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: Anna-Maria Behnsen <anna-maria@linutronix.de> Acked-by: Frederic Weisbecker <frederic@kernel.org> Link: https://lore.kernel.org/r/20240325172048.548199937@linutronix.de
Commit c33621b ("x86/virt/tdx: Wire up basic SEAMCALL functions") introduced a new instance of core-y instead of the standardized obj-y syntax. X86 Makefiles descend into subdirectories of arch/x86/virt inconsistently; into arch/x86/virt/ via core-y defined in arch/x86/Makefile, but into arch/x86/virt/svm/ via obj-y defined in arch/x86/Kbuild. This is problematic when you build a single object in parallel because multiple threads attempt to build the same file. $ make -j$(nproc) arch/x86/virt/vmx/tdx/seamcall.o [ snip ] AS arch/x86/virt/vmx/tdx/seamcall.o AS arch/x86/virt/vmx/tdx/seamcall.o fixdep: error opening file: arch/x86/virt/vmx/tdx/.seamcall.o.d: No such file or directory make[4]: *** [scripts/Makefile.build:362: arch/x86/virt/vmx/tdx/seamcall.o] Error 2 Use the obj-y syntax, as it works correctly. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20240330060554.18524-1-masahiroy@kernel.org
When compiling the v6.9-rc1 kernel with the x32 compiler, the following
errors are reported. The reason is that we take an "unsigned long"
variable and print it using "PRIx64" format string.
In file included from check.c:16:
check.c: In function ‘add_dead_ends’:
/usr/src/git/linux-2.6/tools/objtool/include/objtool/warn.h:46:17: error: format ‘%llx’ expects argument of type ‘long long unsigned int’, but argument 5 has type ‘long unsigned int’ [-Werror=format=]
46 | "%s: warning: objtool: " format "\n", \
| ^~~~~~~~~~~~~~~~~~~~~~~~
check.c:613:33: note: in expansion of macro ‘WARN’
613 | WARN("can't find unreachable insn at %s+0x%" PRIx64,
| ^~~~
...
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: linux-kernel@vger.kernel.org
…inux/kernel/git/tip/tip
Pull x86 fixes from Borislav Petkov:
- Make sure single object builds in arch/x86/virt/ ala
make ... arch/x86/virt/vmx/tdx/seamcall.o
work again
- Do not do ROM range scans and memory validation when the kernel is
running as a SEV-SNP guest as those can get problematic and, before
that, are not really needed in such a guest
- Exclude the build-time generated vdso-image-x32.o object from objtool
validation and in particular the return sites in there due to a
warning which fires when an unpatched return thunk is being used
- Improve the NMI CPUs stall message to show additional information
about the state of each CPU wrt the NMI handler
- Enable gcc named address spaces support only on !KCSAN configs due to
compiler options incompatibility
- Revert a change which was trying to use GB pages for mapping regions
only when the regions would be large enough but that change lead to
kexec failing
- A documentation fixlet
* tag 'x86_urgent_for_v6.9_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/build: Use obj-y to descend into arch/x86/virt/
x86/sev: Skip ROM range scans and validation for SEV-SNP guests
x86/vdso: Fix rethunk patching for vdso-image-x32.o too
x86/nmi: Upgrade NMI backtrace stall checks & messages
x86/percpu: Disable named address spaces for KCSAN
Revert "x86/mm/ident_map: Use gbpages only where full GB page should be mapped."
Documentation/x86: Fix title underline length
…cm/linux/kernel/git/tip/tip Pull objtool fix from Borislav Petkov: - Fix a format specifier build error in objtool during an x32 build * tag 'objtool_urgent_for_v6.9_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: objtool: Fix compile failure when using the x32 compiler
…m/linux/kernel/git/tip/tip Pull timers update from Borislav Petkov: - Volunteer in Anna-Maria and Frederic as timers co-maintainers so that tglx can relax more :-P * tag 'timers_urgent_for_v6.9_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: MAINTAINERS: Add co-maintainers for time[rs]
…linux/kernel/git/tip/tip Pull x86 perf fixes from Borislav Petkov: - Define the correct set of default hw events on AMD Zen4 - Use the correct stalled cycles PMCs on AMD Zen2 and newer - Fix detection of the LBR freeze feature on AMD * tag 'perf_urgent_for_v6.9_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86/amd/core: Define a proper ref-cycles event for Zen 4 and later perf/x86/amd/core: Update and fix stalled-cycles-* events for Zen 2 and later perf/x86/amd/lbr: Use freeze based on availability x86/cpufeatures: Add new word for scattered features
…inux/kernel/git/tip/tip Pull irq fixes from Borislav Petkov: - Fix an unused function warning on irqchip/irq-armada-370-xp - Fix the IRQ sharing with pinctrl-amd and ACPI OSL * tag 'irq_urgent_for_v6.9_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: irqchip/armada-370-xp: Suppress unused-function warning genirq: Introduce IRQF_COND_ONESHOT and use it in pinctrl-amd
…linux/kernel/git/ras/ras Pull EDAC fixes from Borislav Petkov: - Fix more issues in the AMD FMPM driver * tag 'edac_urgent_for_v6.9_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras: RAS: Avoid build errors when CONFIG_DEBUG_FS=n RAS/AMD/FMPM: Safely handle saved records of various sizes RAS/AMD/FMPM: Avoid NULL ptr deref in get_saved_records()
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Passing a sufficient amount of imix entries leads to invalid access to the pkt_dev->imix_entries array because of the incorrect boundary check. UBSAN: array-index-out-of-bounds in net/core/pktgen.c:874:24 index 20 is out of range for type 'imix_pkt [20]' CPU: 2 PID: 1210 Comm: bash Not tainted 6.10.0-rc1 #121 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Call Trace: <TASK> dump_stack_lvl lib/dump_stack.c:117 __ubsan_handle_out_of_bounds lib/ubsan.c:429 get_imix_entries net/core/pktgen.c:874 pktgen_if_write net/core/pktgen.c:1063 pde_write fs/proc/inode.c:334 proc_reg_write fs/proc/inode.c:346 vfs_write fs/read_write.c:593 ksys_write fs/read_write.c:644 do_syscall_64 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:130 Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 52a62f8 ("pktgen: Parse internet mix (imix) input") Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru> [ fp: allow to fill the array completely; minor changelog cleanup ] Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
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