Re: Early boot regression from f0551af0213 ("x86/topology: Ignore non-present APIC IDs in a present package")

From: Lyude Paul
Date: Mon May 13 2024 - 19:33:29 EST


Oh! I am not sure what changed, but I realized that you might also want to see
the serial output from the debugging patch that you had sent me a while ago.
So I just built that against the 6.9 kernel and it actually seems to boot
without needing me to pass intremap=off. So it seems like that might actually
be a fix!

On Mon, 2024-05-13 at 19:18 -0400, Lyude Paul wrote:
> On Mon, 2024-05-13 at 16:08 +0200, Thomas Gleixner wrote:
> > On Wed, May 08 2024 at 19:21, Lyude Paul wrote:
> > > Regarding the test results - I tried possible_cpus all the way up to 17
> > > and nothing got the machine to boot. However, possible_cpus=8
> > > intremap=off did get the machine to boot successfully
> >
> > Oh. That's interesting.
> >
> > Does v6.9 (released yesterday) boot with just 'intremap=off' too?
>
> Yes - it still boots. As well I finally got the serial console adapter in, but
> I don't see any additional output:
>
> [ 0.146896] printk: legacy console [tty0] enabled
> [ 0.147433] printk: legacy console [ttyS0] enabled
> [ 1.951453] ACPI: Core revision 20230628
> [ 1.955466] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 133484873504 ns
> [ 1.964698] APIC: Switch to symmetric I/O mode setup
> [ 1.970973] AMD-Vi: Using global IVHD EFR:0xf77ef22294ada, EFR2:0x0
> [ 1.978491] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
> [ 1.996945] Kernel panic - not syncing: timer doesn't work through Interrupt-remapped IO-APIC
> [ 2.005376] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.9.0Lyude-Test+ #7
> [ 2.012248] Hardware name: MSI MS-7A39/A320M GAMING PRO (MS-7A39), BIOS 1.I0 01/22/2019
> [ 2.020160] Call Trace:
> [ 2.022584] <TASK>
> [ 2.024666] dump_stack_lvl+0x5d/0x80
> [ 2.028499] panic+0x118/0x2c8
> [ 2.031522] ? timer_irq_works+0x54/0xf0
> [ 2.035408] panic_if_irq_remap.cold+0x5/0x9
> [ 2.039631] setup_IO_APIC+0x398/0x860
> [ 2.043475] ? _raw_spin_unlock_irqrestore+0x1d/0x40
> [ 2.048393] ? clear_IO_APIC_pin+0x125/0x1e0
> [ 2.052617] apic_intr_mode_init+0xcc/0xe0
> [ 2.056672] x86_late_time_init+0x24/0x40
> [ 2.060820] start_kernel+0x8be/0x960
> [ 2.064446] x86_64_start_reservations+0x24/0x30
> [ 2.069015] x86_64_start_kernel+0x95/0xa0
> [ 2.073069] common_startup_64+0x13e/0x141
> [ 2.077280] </TASK>
> [ 2.079447] ---[ end Kernel panic - not syncing: timer doesn't work through Interrupt-remapped IO-APIC ]---
>
>
> >
> > Thanks,
> >
> > tglx
> >
>

--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat