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https://www.linuxquestions.org/questions/linux-hardware-18/mp-bios-bug-8254-timer-not-connected-use-noapic-option-to-boot-591891/
Nov 26, 2016 · MP-BIOS BUG 8254 timer not connected - use noapic option to boot Maybe most of you used some Ubuntu version. What I am talking about is the "MP-BIOS bug: 8254 timer not connected" message that one would get when booting a live CD with a Linux distro.
https://www.redhat.com/archives/fedora-test-list/2008-January/msg00296.html
as only one CPU will run, pluss other related problems. I think the 8254 is used for trottling and such. This timer may also involve the interrupt structure. The wrong addressing may be the reason for the later problems seen in the "dmesg" files that I included. For some reason, when the …
https://pdos.csail.mit.edu/6.828/2016/readings/ia32/ioapic.pdf
APICREQ# O APIC REQUEST: APICREQ# is asserted prior to the APIC sending an interrupt message over the APIC data bus. This is the request part of a handshake that insures system level buffer coherency prior to sending an interrupt over the APIC bus. This signal is tri-stated during reset. This signal has an internal pull-up resistor.
https://askubuntu.com/questions/729727/mp-bios-bug8254-timer-not-connected-to-io-apic-error-on-vostro-1000-liveusb/729758
I'm trying to install lubuntu on to my Dell Vostro 1000. I'm using a LiveUsb (via pendrive). I get the start up screen and when I choose try lubuntu without installing I get this message: Mp-bio...
https://bugzilla.redhat.com/show_bug.cgi?id=698842
Description of problem: Boot up a rhel5.6 guest, using kvmclock, guest always panic. ACPI: Core revision 20060707 ..MP-BIOS bug: 8254 timer not connected to IO-APIC Kernel panic - not syncing: IO-APIC + timer doesn't work!
https://bbs.archlinux.org/viewtopic.php?id=109042
Nov 28, 2010 · Re: MP-BIOS bug: 8254 timer not connected to IO-APIC It's the kernel trying to work around a timer (clock) bug in your bios, but as you can see it succeeds with the third method. If updating your bios doesn't improve this, you may decide to file a support request with Compaq, but chances are slim they will proceed with it since this is an older ...
https://terenceli.github.io/%E6%8A%80%E6%9C%AF/2018/09/06/qemu-interrupt-emulation
In this function it calls ‘ioapic_service’ to delivery interrupt to the LAPIC. This is through ‘stl_le_phys’, this will cause the apic’s MMIO write function being called, which is ‘apic_mem_writel’. APIC can call ‘apic_update_irq’ to process interrupt. THen ‘cpu_interrupt’ and finally ‘kvm_handle_interrupt’ is called.
https://en.wikipedia.org/wiki/IO-APIC
In computing, Intel's Advanced Programmable Interrupt Controller (APIC) is a family of interrupt controllers.As its name suggests, the APIC is more advanced than Intel's 8259 Programmable Interrupt Controller (PIC), particularly enabling the construction of multiprocessor systems. It is one of several architectural designs intended to solve interrupt routing efficiency issues in multiprocessor ...
https://marc.info/?l=freebsd-smp&m=104441266503132
[prev in list] [next in list] [prev in thread] [next in thread] List: freebsd-smp Subject: Re: Broken MP table: BIOS or hardware? From ... Interrupt-driven port ppi0: <Parallel I/O> on ppbus0 APIC_IO: Testing 8254 interrupt delivery APIC_IO: Broken MP table detected: 8254 is not connected to IOAPIC #0 intpin 2 ^^^^^ Is this purely a BIOS issue? ...
https://sites.google.com/site/masumzh/articles/hypervisor-based-virtualization/io-and-interrupt-virtualization
Virtual-interrupt delivery has the same priority as that of VM exits due to the 1-setting of the “interrupt-window exiting” VM-execution control.1 Thus, non-maskable interrupts (NMIs) and higher priority events take priority over delivery of a virtual interrupt; delivery of a virtual interrupt takes priority over external interrupts and ...
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