[Xen-devel] [PATCH 0/4] HVM Virtual S3

["Yu, Ke" <ke.yu@xxxxxxxxx>]

[PATCH 0/4] HVM Virtual S3

These set of patches are our prototype for HVM virtual ACPI S3 support:
 - patch 1/4: Xen interface for HVM S3
 - patch 2/4: QEMU interface for HVM S3
 - patch 3/4: rombios interface for HVM S3
 - patch 4/4: xend interface for HVM S3

The main idea is:
- emulate ACPI PM1A control resiger in QEMU to capture guest S3 request
- when QEMU capture guest S3 request, it call hypercall to trap to Xen
- Xen will suspend HVM by reseting all vcpus
- on resume, "xm resume" will call hypercall to trap to Xen
- Xen will resume HVM by setting HVM vcpu EIP to VMXASSIST BASE, which
will start rombios post code
- rombios post code will start s3 resume by jumping to wakeup vector set
by guest OS.

How to use it:
- apply this patch to changeset 15050:05c128b0188a
- create and boot HVM domain 
- In HVM guest, enter S3 state
  * for Linux, "echo mem >/sys/power/state"
  * for Windows, shutdown windows by Standby
- to resume HVM domain, "xm resume <domid>"

Note: FC6 guest can successfully S3 suspend/resume in both text mode and
X window. However, Windows guest can not suspend, because the windows
driver for QEMU VGA and monitor has no power management support, and
windows refuse to enter S3 sleep state. 

Kevin/Ke

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