lkml.org 
[lkml]   [2007]   [Nov]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] kexec: force x86_64 arches to boot kdump kernels on boot cpu
    On Fri, Nov 30, 2007 at 12:59:26AM -0800, Yinghai Lu wrote:
    > On Nov 29, 2007 6:54 PM, Eric W. Biederman <ebiederm@xmission.com> wrote:
    > > Ben Woodard <woodard@redhat.com> writes:
    > >
    > >
    > > > Eric W. Biederman wrote:
    > > >> Vivek Goyal <vgoyal@redhat.com> writes:
    > > >>
    > > >>> Ok. Got it. So in this case we route the interrupts directly through LAPIC
    > > >>> and put LVT0 in ExtInt mode and IOAPIC is bypassed.
    > > >>>
    > > >>> I am looking at Intel Multiprocessor specification v1.4 and as per figure
    > > >>> 3-3 on page 3-9, 8259 is connected to LINTIN0 line, which in turn is
    > > >>> connected to LINTIN0 pin on all processors. If that is the case, even in
    > > >>> this mode, all the CPU should see the timer interrupts (which is coming
    > > >>> from 8259)?
    > > >>
    >
    > there is two mode for mcp55. bios should have one option about virtul
    > wired to LVT0 of BSP or IOAPIC pin 0.
    > or the option like hpet route to ioapic pin 2.
    >

    That's interesting. So with BIOS options I can force timer
    interrupts to be routed through IOAPIC? That would enable us to get
    timer interrupts on any of the cpus in legacy mode. Ben, can you give it
    a try?

    > for kdump fix, could enable LVT0 of CPU for kdump and disable that for BSP?

    We would not know the crashing cpu in advance hence can't set it.

    Thanks
    Vivek
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-11-30 15:39    [W:0.044 / U:120.616 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site