On 2015/10/30 2:17, Wei Huang wrote: > On 10/29/2015 09:27 AM, Shannon Zhao wrote: >> ACPI SPEC 5.0 defines GPIO-signaled ACPI Events for Hardware-reduced >> platforms(like ARM). It uses GPIO pin to trigger an event to the guest. >> For QEMU, here we add PL061 GPIO controller and use PIN 3 for >> system_powerdown, reserving PIN 0, 1, 2 for PCI hotplug, CPU hotplug and >> memory hotplug. >> >> This patchset adds system_powerdown support on ARM through both ACPI and >> DT ways. It adds a GPIO controller(here is PL061) in machine virt and >> uses GPIO-singled event for ACPI while gpio-keys for DT. It can be >> fetched from [1] and has been tested for the guests starting by ACPI or >> DT while guests use systemd or acpid. >> >> a) ACPI way. Since Graeme send a patchset to make ACPI on ARM64 support >> amba device[2], it could use PL061 directly without modification to its >> kernel driver code. In addition, we should use ACPI to start VM, >> referring to below script. QEMU_EFI.fd can be fetched from [3]. > > Hi Shannon, > > Thanks for re-sending it. This is a desired feature because we don't > want to rely on tricks (such as guest-agent) for external VM power > management. I have tested V1 recently by back-porting to my in-house > kernel; it worked well. > > I will help review this new version. > Thanks for your help:)
-- Shannon
