linux

iv/linux

History

Miroslav Benes 05df3bdbc2 x86/xen: Make the secondary CPU idle tasks reliable

commit c3881eb58d56116c79ac4ee4f40fd15ead124c4b upstream.

The unwinder reports the secondary CPU idle tasks' stack on XEN PV as
unreliable, which affects at least live patching.
cpu_initialize_context() sets up the context of the CPU through
VCPUOP_initialise hypercall. After it is woken up, the idle task starts
in cpu_bringup_and_idle() function and its stack starts at the offset
right below pt_regs. The unwinder correctly detects the end of stack
there but it is confused by NULL return address in the last frame.

Introduce a wrapper in assembly, which just calls
cpu_bringup_and_idle(). The return address is thus pushed on the stack
and the wrapper contains the annotation hint for the unwinder regarding
the stack state.

Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Markus Boehme <markubo@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2022-05-25 09:14:31 +02:00

alpha

alpha: Declare virt_to_phys and virt_to_bus parameter as pointer to volatile

2021-09-30 10:09:26 +02:00

arc

ARC: entry: fix syscall_trace_exit argument

2022-04-27 13:50:49 +02:00

arm

arm[64]/memremap: don't abuse pfn_valid() to ensure presence of linear map

2022-05-18 09:47:28 +02:00

arm64

arm[64]/memremap: don't abuse pfn_valid() to ensure presence of linear map