This patch series introduces the initial support for guest suspend
and resume on ARM platforms using the PSCI SYSTEM_SUSPEND interface. The main
goal is to allow ARM guests to request suspension using PSCI and be resumed
by the control domain (e.g., via "xl resume").
Background
The PSCI SYSTEM_SUSPEND call is part of the PSCI v1.0+ specification and is
used by guests to enter the deepest possible power state. On Xen/ARM, we
emulate this interface in the virtual PSCI (vPSCI) layer for guests.
This series includes:
1. A new vPSCI implementation of the PSCI SYSTEM_SUSPEND function for guests
2. Documentation updates to SUPPORT.md to reflect PSCI and vPSCI support status
3. Enabling "xl resume" command compilation for ARM, which was previously
disabled
Usage
For Linux-based guests:
- Suspend can be triggered using: "echo mem > /sys/power/state" or "systemctl
suspend"
- Resume can be performed from control domain using: "xl resume <domain>"
For more information, refer to the official Linux kernel documentation on power
management.
Note that currently, SYSTEM_SUSPEND is supported only for guest domains (not for
the hardware domain).
---
This is the first part of previous patch series and originally consist only
with necessary changes needed for guest domain suspend.
The second part can be found here:
https://patchew.org/Xen/[email protected]/
---
Changes in V15:
- add forward declaration of vcpu and domain structures to asm/suspend.h
- minor fixes after review
Mykola Kvach (4):
xen/arm: Implement PSCI SYSTEM_SUSPEND call for guests
tools/xl: Allow compilation of 'xl resume' command on Arm
SUPPORT.md: Document PSCI SYSTEM_SUSPEND support for guests
CHANGELOG: Document guest suspend/resume to RAM support on Arm
CHANGELOG.md | 4 +
SUPPORT.md | 5 +-
tools/include/libxl.h | 1 -
tools/xl/xl.h | 4 +-
tools/xl/xl_cmdtable.c | 4 +-
tools/xl/xl_migrate.c | 2 +-
tools/xl/xl_saverestore.c | 2 +-
tools/xl/xl_vmcontrol.c | 12 +--
xen/arch/arm/domain.c | 41 +++++++++
xen/arch/arm/include/asm/domain.h | 2 +
xen/arch/arm/include/asm/perfc_defn.h | 1 +
xen/arch/arm/include/asm/psci.h | 2 +
xen/arch/arm/include/asm/suspend.h | 27 ++++++
xen/arch/arm/include/asm/vpsci.h | 5 +-
xen/arch/arm/vpsci.c | 116 +++++++++++++++++++++-----
xen/common/domain.c | 5 ++
xen/include/xen/suspend.h | 25 ++++++
17 files changed, 221 insertions(+), 37 deletions(-)
create mode 100644 xen/arch/arm/include/asm/suspend.h
create mode 100644 xen/include/xen/suspend.h
--
2.43.0
