linux-rng/arch/x86/kernel/apic, branch master

Merge tag 'x86_cpu_for_v7.3_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2026-08-19T02:09:42Z

Pull x86 cpuid updates from Borislav Petkov: - Get rid of static_cpu_has() - one less API to care about testing CPU features - Unify the handling of CPU core types (performance, efficient, etc) by mapping the vendor-specific types to Linux ones - Continuation of the work of Ahmed Darwish to centralize CPUID leaf representation * tag 'x86_cpu_for_v7.3_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/CPU: Rename struct cpuid_read_output to struct cpuid_output x86/cpu/scattered: Sort it properly x86/cpu: Use parsed CPUID(0x1) x86/lib: Add CPUID(0x1) family and model calculation x86/cpu: Use parsed CPUID(0x0) x86/cpu/transmeta: Rescan CPUID(0x1) after modifying capabilities x86/topology: Add TOPO_CPU_TYPE_LOW_POWER x86/topology: Name the AMD core-type values x86/topo: Map vendor CPU types to generic Linux such types x86/bugs: Don't use cpu-type matching in cpu_vuln_blacklist x86/cpu: Hide and rename static_cpu_has()

Merge tag 'x86_cleanups_for_v7.3_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2026-08-19T01:34:58Z

Pull x86 cleanups from Borislav Petkov: - The usual pile of smallish cleanups and fixlets all over the place * tag 'x86_cleanups_for_v7.3_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/cpu: Remove unnecessary __maybe_unused annotations x86/msr: Document the I/O-like write semantics in the msr driver x86/apic: Ensure ICR register write value is handled as 32 bits x86/boot/compressed/head_64.S: Clean up SEV-related comments Documentation/arch/x86/amd-memory-encryption.rst: Fix typo x86/platform/quark: Fix kernel-doc warnings in imr.c x86/ras: Move contents from arch/x86/ras/Kconfig into drivers/ras/Kconfig x86/cpu: Move intel_get_platform_id() to cpu/intel.c x86/mm: Fix typo in comment x86/fpu: Fix kernel-doc formatting above fpu_enable_guest_xfd_features() x86/cfi: Use symmetric SYM_START and SYM_END in __CFI_TYPE() x86/cfi: Add __init_or_module annotations for fineibt

x86/apic: Ensure ICR register write value is handled as 32 bits

2026-07-20T18:58:50Z

The low 32-bit ICR data is prepared by __prepare_ICR(), which returns a 32-bit value. However, when this value is assigned to a new variable, it's easy to mistakenly declare that variable with a different width. To avoid this class of mistakes, use __prepare_ICR() directly as the function argument instead of storing its result in an intermediate variable. This also shaves off a bunch of lines in the code. There should be no functionality change resulting from this. Signed-off-by: Melody Wang Signed-off-by: Borislav Petkov (AMD) Acked-by: Thomas Gleixner Link: https://patch.msgid.link/20260708012117.177959-1-huibo.wang@amd.com

x86/cpu: Hide and rename static_cpu_has()

2026-07-07T04:34:26Z

cpu_feature_enabled() is the one to use to test feature flags so hide the static thing which doesn't pay attention to disabled mask bits anyway. Use the following command to do the replacement: $ git grep --files-with-matches -w static_cpu_has -- ':(exclude)*cpufeature.h' \ | xargs sed -i 's/static_cpu_has(/cpu_feature_enabled\(/g' There should be no functional changes resulting from this. Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Nikolay Borisov Link: https://patch.msgid.link/20260620015041.336288-1-bp@kernel.org

x86/apic: Stop using 32-bit MSR interfaces

2026-07-02T09:54:52Z

The 32-bit MSR interfaces rdmsr() and wrmsr() are planned to be removed. Use the related 64-bit variants instead. Signed-off-by: Juergen Gross Signed-off-by: Ingo Molnar Link: https://patch.msgid.link/20260629060526.3638272-19-jgross@suse.com

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2026-06-25T17:21:13Z

Pull kvm fixes from Paolo Bonzini: "s390: - Fix S390_USER_OPEREXEC so it can now be enabled regardless of other unrelated capabilities - Fix handling of the _PAGE_UNUSED pte bit that could lead to guest memory corruption in some scenarios - A bunch of misc gmap fixes (locking, behaviour under memory pressure) - Fix CMMA dirty tracking x86: - Tidy up some WARN_ON() and BUG_ON(), replacing them with WARN_ON_ONCE() or KVM_BUG_ON(). All of these have obviously never triggered, or somebody would have been annoyed earlier, but still... - Fix missing interrupt due to stale CR8 intercept - Add a statistic that can come in handy to debug leaks as well as the vulnerability to a class of recently-discovered issues - Do not ask arch/x86/kernel to export default_cpu_present_to_apicid() just for KVM" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (22 commits) x86/apic: KVM: Use cpu_physical_id() to get APIC ID of running vCPU for AVIC KVM: x86/mmu: Expose number of shadow MMU shadow pages as a stat KVM: x86: Unconditionally recompute CR8 intercept on PPR update KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode KVM: x86: WARN (once) if RTC pending EOI tracking goes off the rails KVM: x86: WARN and fail kvm_set_irq() if a PIC or I/O APIC vector is invalid KVM: x86: Bug the VM, not the kernel, if the ISR count {under,over}flows KVM: x86/mmu: Bug the VM, not the host kernel, if KVM write-protects upper SPTEs KVM: x86: Replace BUG_ON() with WARN_ON_ONCE() on "bad" nested GPA translation KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned() KVM: s390: Return failure in case of failure in kvm_s390_set_cmma_bits() KVM: s390: selftests: Fix cmma selftest KVM: s390: Fix cmma dirty tracking KVM: s390: Fix locking in kvm_s390_set_mem_control() KVM: s390: Fix handle_{sske,pfmf} under memory pressure KVM: s390: Fix code typo in gmap_protect_asce_top_level() KVM: s390: Do not set special large pages dirty KVM: s390: Fix dat_peek_cmma() overflow s390/mm: Fix handling of _PAGE_UNUSED pte bit KVM: s390: Fix typo in UCONTROL documentation ...

x86/apic: KVM: Use cpu_physical_id() to get APIC ID of running vCPU for AVIC

2026-06-24T11:52:24Z

Use cpu_physical_id() instead of default_cpu_present_to_apicid() when getting the APIC ID of the pCPU on which a vCPU is running/loaded, as the kernel has gone way off the rails if a vCPU is loaded on a pCPU that has been physically removed from the system. Even if the impossible were to happen, the absolutely worst case scenario is that hardware will ring the AIVC doorbell on the wrong pCPU, i.e. a severely broken system will experience mild performance issues. Kill off KVM's superfluous kvm_cpu_get_apicid() wrapper along with the for-KVM export of default_cpu_present_to_apicid(), as they existed purely for the wonky AVIC usage. Cc: Kai Huang Cc: Yosry Ahmed Signed-off-by: Sean Christopherson Acked-by: Naveen N Rao (AMD) Reviewed-by: Kai Huang Reviewed-by: Yosry Ahmed Message-ID: <20260612185459.591892-1-seanjc@google.com> Signed-off-by: Paolo Bonzini

Merge tag 'x86-cpu-2026-06-14' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip

2026-06-15T09:55:17Z

Pull x86 cpuid updates from Ingo Molnar: - CPUID API updates (Ahmed S. Darwish): - Introduce a centralized CPUID parser - Introduce a centralized CPUID data model - Introduce - Rename cpuid_leaf()/cpuid_subleaf() APIs - treewide: Explicitly include the x86 CPUID headers - Update to x86-cpuid-db v3.1 (Maciej Wieczor-Retman) - Continued removal of pre-i586 support and related simplifications (Ingo Molnar) - Add Intel CPU model number for rugged Panther Lake (Tony Luck) - Misc fixes, updates and cleanups by Arnd Bergmann, Chao Gao, Lukas Bulwahn, Sohil Mehta, Maciej Wieczor-Retman. * tag 'x86-cpu-2026-06-14' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip: (25 commits) x86/cpu: Make CONFIG_X86_CX8 unconditional x86/cpu: Remove unused !CONFIG_X86_TSC code x86/cpuid: Update bitfields to x86-cpuid-db v3.1 tools/x86/kcpuid: Update bitfields to x86-cpuid-db v3.1 x86/cpu: Make CONFIG_X86_TSC unconditional MAINTAINERS: Drop obsolete FPU EMULATOR section x86/cpu: Fix a F00F bug warning and clean up surrounding code x86/cpu: Add Intel CPU model number for rugged Panther Lake x86/cpuid: Introduce a centralized CPUID parser x86/cpu: Introduce a centralized CPUID data model x86/cpuid: Introduce x86/cpuid: Rename cpuid_leaf()/cpuid_subleaf() APIs x86/cpu: Do not include the CPUID API header in asm/processor.h Documentation: core-api/cpu_hotplug: Remove stale cpu0_hotplug docs x86/cpu, cpufreq: Remove AMD ELAN support x86/fpu: Remove the math-emu/ FPU emulation library x86/fpu: Remove the 'no387' boot option x86/fpu: Remove MATH_EMULATION and related glue code treewide: Explicitly include the x86 CPUID headers x86/cpu: Remove the CONFIG_X86_INVD_BUG quirk ...

x86/irq: Move IOAPIC misrouted and PIC/APIC error counts into irq_stats

2026-05-26T14:21:12Z

The special treatment of these counts is just adding extra code for no real value. The irq_stats mechanism allows to suppress output of counters, which should never happen by default and provides a mechanism to enable them for the rare case that they occur. Move the IOAPIC misrouted and the PIC/APIC error counts into irq_stats, mark them suppressed by default and update the sites which increment them. This changes the output format of 'ERR' and 'MIS' in case there are events to the regular per CPU display format and otherwise suppresses them completely. As a side effect this removes the arch_cpu_stat() mechanism from proc/stat which was only there to account for the error interrupts on x86 and missed to take the misrouted ones into account. Signed-off-by: Thomas Gleixner Tested-by: Michael Kelley Reviewed-by: Radu Rendec Link: https://patch.msgid.link/20260517194931.361942103@kernel.org

x86/irq: Suppress unlikely interrupt stats by default

2026-05-26T14:21:12Z

Unlikely interrupt counters like the spurious vector and the synthetic APIC ICR read retry show up in /proc/interrupts with all counts 0 most of the time. As these are events which should never happen, suppress them by default and enable them for output when they actually happen. This requires a seperate bitmap as the description array is marked __ro_after_init. With that bitmap in place it becomes RO data. Signed-off-by: Thomas Gleixner Tested-by: Michael Kelley Reviewed-by: Radu Rendec Link: https://patch.msgid.link/20260517194931.276486277@kernel.org