linux-kernel - [PATCH v3 0/2] x86/xen: Make idle tasks reliable

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Date:   Thu, 26 Mar 2020 10:26:01 +0100
From:   Miroslav Benes <mbenes@...e.cz>
To:     boris.ostrovsky@...cle.com, jgross@...e.com,
        sstabellini@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, jpoimboe@...hat.com
Cc:     x86@...nel.org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
        jslaby@...e.cz, andrew.cooper3@...rix.com, jbeulich@...e.com,
        Miroslav Benes <mbenes@...e.cz>
Subject: [PATCH v3 0/2] x86/xen: Make idle tasks reliable

The unwinder reports idle tasks' stack on XEN PV as unreliable which
complicates things for at least live patching. The two patches in the
series try to amend that by using similar approach as non-XEN x86 does.

v2->v3:
- change prototype of asm_cpu_bringup_and_idle()
- replace %_ASM_SP with %rsp and %esp respectively
- fix build for !CONFIG_XEN_PV_SMP

v1->v2:
- call instruction used instead of push+jmp
- initial_stack used directly

v1 https://lore.kernel.org/live-patching/20200312142007.11488-1-mbenes@suse.cz/
v2 https://lore.kernel.org/live-patching/20200319095606.23627-1-mbenes@suse.cz/

Miroslav Benes (2):
  x86/xen: Make the boot CPU idle task reliable
  x86/xen: Make the secondary CPU idle tasks reliable

 arch/x86/xen/smp_pv.c   |  3 ++-
 arch/x86/xen/xen-head.S | 18 ++++++++++++++++--
 2 files changed, 18 insertions(+), 3 deletions(-)

-- 
2.25.1