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[Xen-devel] Current HVM acpi support is broken

To: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>, <Keir.Fraser@xxxxxxxxxxxx>, <Christian.Limpach@xxxxxxxxxxxx>
Subject: [Xen-devel] Current HVM acpi support is broken
From: "Wang, Winston L" <winston.l.wang@xxxxxxxxx>
Date: Tue, 8 Aug 2006 10:46:54 -0700
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Tang Liang <tangliang@xxxxxxxxxx>
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Thread-topic: Current HVM acpi support is broken
Hi Christian, Ian and Kair,

I think current hvm acpi support is broken. 
We noticed qemu to 0.82 with acpi support is introduced on changset
10957, it is conflict with xen hvm acpi code, in ../ioemu/hw/cp.c start
from ln 860: 

    cmos_init(ram_size, boot_device, bs_table, timeoffset);

    /* using PIIX4 acpi model */
    if (pci_enabled && acpi_enabled)
        pci_piix4_acpi_init(pci_bus, piix3_devfn + 3);

    if (pci_enabled && usb_enabled) {
        usb_uhci_init(pci_bus, piix3_devfn + 2);

    if (pci_enabled && acpi_enabled && 0) {
        piix4_pm_init(pci_bus, piix3_devfn + 3);
    /* XXX: should be done in the Bochs BIOS */
    if (pci_enabled) {
        if (acpi_enabled)

The above code generate two acpi tables and acpi pci piix func3 device
when acpi=1 in hvm guest platform.

Two sets of acpi can not co-exist:) What acpi set do we need to keep?
What is the advatage for that?

We are cureent have to use changset 10955 puls acpi_init_fix.patch for
acpi related development.



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