similar to: [PATCH 06/27] xen, smpboot: Use generic SMP booting infrastructure

From: Joerg Roedel <jroedel at suse.de> The IDT on 64bit contains vectors which use paranoid_entry() and/or IST stacks. To make these vectors work the TSS and the getcpu GDT entry need to be set up before the IDT is loaded. Signed-off-by: Joerg Roedel <jroedel at suse.de> --- arch/x86/include/asm/processor.h | 1 + arch/x86/kernel/cpu/common.c | 23 +++++++++++++++++++++++

Current kernel, and I just booted, and dmesg shows, of the 32 cores, 0, 2, 4 and 6 ok, and *all* other show "is now offline. What's happening here? mark

m.roth at 5-cent.us wrote: > Current kernel, and I just booted, and dmesg shows, of the 32 cores, 0, 2, > 4 and 6 ok, and *all* other show "is now offline. > > What's happening here? > A followup: I also find a core in /var/spool/abrt, and "reason" is kernel BUG at mm/slub.c:3601! In googling, I see threads about incorrect calculation of slabs. Following one

m.roth at 5-cent.us wrote: > m.roth at 5-cent.us wrote: >> Current kernel, and I just booted, and dmesg shows, of the 32 cores, 0, >> 2, 4 and 6 ok, and *all* other show "is now offline. >> >> What's happening here? <snip> Ok, more info. I found how to online a CPU - echo 1 > /sys/devices/system/cpu/cpu23/online Perhaps I should have started with 1,3,

>From: Tristan Gingold >Sent: 2006年5月23日 15:30 > >Le Lundi 22 Mai 2006 17:44, Keir Fraser a écrit : >> On 22 May 2006, at 08:57, Tristan Gingold wrote: >> > this patch creates a new file: cpuhotplug.c. The content is the >xenbus >> > handler part of smpboot.c. The purpose is to be able to share this >> > part with >> > other architectures.

On Mon, Sep 07, 2020 at 03:16:08PM +0200, Joerg Roedel wrote: > From: Joerg Roedel <jroedel at suse.de> > > The IDT on 64bit contains vectors which use paranoid_entry() and/or IST > stacks. To make these vectors work the TSS and the getcpu GDT entry need > to be set up before the IDT is loaded. > > Signed-off-by: Joerg Roedel <jroedel at suse.de> > --- >

From: Joerg Roedel <jroedel at suse.de> Set up the TSS for starting APs before they are kicked. This allows the APs to use IST in early exception handling. Also load the TSS early if the TSS entry in the GDT is present. This makes sure a TSS is only loaded when it has been set up. Signed-off-by: Joerg Roedel <jroedel at suse.de> Link: