The branch stable/15 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=2079e5864f204c552b82b63809e1b39b13ccfd3c
commit 2079e5864f204c552b82b63809e1b39b13ccfd3c Author: Konstantin Belousov <[email protected]> AuthorDate: 2025-12-09 02:18:21 +0000 Commit: Konstantin Belousov <[email protected]> CommitDate: 2026-01-25 00:23:34 +0000 x86: mask all LAPIC vectors early, before BSP interrupts are enabled (cherry picked from commit 11f954b021a1aadde1d03d40ed5d6b529e14da98) --- sys/x86/x86/local_apic.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/sys/x86/x86/local_apic.c b/sys/x86/x86/local_apic.c index aecad4cbd463..053d9814c14c 100644 --- a/sys/x86/x86/local_apic.c +++ b/sys/x86/x86/local_apic.c @@ -428,6 +428,7 @@ lapic_is_x2apic(void) (APICBASE_X2APIC | APICBASE_ENABLED)); } +static void lapic_early_mask_vecs(void); static void lapic_enable(void); static void lapic_resume(struct pic *pic, bool suspend_cancelled); static void lapic_timer_oneshot(struct lapic *); @@ -553,6 +554,7 @@ lapic_init(vm_paddr_t addr) /* Perform basic initialization of the BSP's local APIC. */ lapic_enable(); + lapic_early_mask_vecs(); /* Set BSP's per-CPU local APIC ID. */ PCPU_SET(apic_id, lapic_id()); @@ -791,6 +793,32 @@ lapic_xapic_mode(void) intr_restore(saveintr); } +static void +lapic_early_mask_vec(const struct lvt *l) +{ + uint32_t v; + + if (l->lvt_masked != 0) { + v = lapic_read32(l->lvt_reg); + v |= APIC_LVT_M; + lapic_write32(l->lvt_reg, v); + } +} + +/* Done on BSP only */ +static void +lapic_early_mask_vecs(void) +{ + int elvt_count, i; + + for (i = 0; i < APIC_LVT_MAX; i++) + lapic_early_mask_vec(&lvts[i]); + + elvt_count = amd_read_elvt_count(); + for (i = 0; i < elvt_count; i++) + lapic_early_mask_vec(&elvts[i]); +} + void lapic_setup(int boot) {
