diff options
| author | Vivek Goyal <vgoyal@in.ibm.com> | 2006-01-11 22:46:21 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-11 19:05:01 -0800 |
| commit | af5b98042452cc6f50de8afa9d079bda8556d74d (patch) | |
| tree | bcfbd3e0ed8daae81ddd7098346334aea93e1d94 | |
| parent | 79f12614a6537cc3ac9ca4d1ea26f6e4f4a34aee (diff) | |
| download | linux-af5b98042452cc6f50de8afa9d079bda8556d74d.tar.bz2 | |
[PATCH] x86_64: ioapic virtual wire mode fix
o Currently, during kexec reboot, IOAPIC is re-programmed back to virtual
wire mode if there was an i8259 connected to it. This enables getting
timer interrupts in second kernel in legacy mode.
o After putting into virtual wire mode, IOAPIC delivers the i8259 interrupts
to CPU0. This works well for kexec but not for kdump as we might crash
on a different CPU and second kernel will not see timer interrupts.
o This patch modifies the redirection table entry to deliver the timer
interrupts to the cpu we are rebooting (instead of hardcoding to zero).
This ensures that second kernel receives timer interrupts even on a
non-boot cpu.
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/x86_64/kernel/io_apic.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c index 6c938c60fa3b..fd1e7c36dc23 100644 --- a/arch/x86_64/kernel/io_apic.c +++ b/arch/x86_64/kernel/io_apic.c @@ -1307,7 +1307,8 @@ void disable_IO_APIC(void) entry.dest_mode = 0; /* Physical */ entry.delivery_mode = dest_ExtINT; /* ExtInt */ entry.vector = 0; - entry.dest.physical.physical_dest = 0; + entry.dest.physical.physical_dest = + GET_APIC_ID(apic_read(APIC_ID)); /* * Add it to the IO-APIC irq-routing table: |