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# Date Author Comment
31745aab 04/15/2012 12:17 pm Alex Williamson

acpi_piix4: Remove PCI_RMV_BASE write code

Clarify this register as read-only and remove write code. No
change in existing behavior.

Signed-off-by: Alex Williamson <>
Signed-off-by: Michael S. Tsirkin <>
9290f364 04/15/2012 12:17 pm Alex Williamson

acpi_piix4: Re-define PCI hotplug eject register read

The PCI hotplug eject register has always returned 0, so let's redefine
it as a hotplug feature register. The existing model of using separate
up & down read-only registers and an eject via write to this register...
ba737541 04/15/2012 12:17 pm Alex Williamson

acpi_piix4: Disallow write to up/down PCI hotplug registers

The write side of these registers is never used and actually can't be
used as defined because any read/modify/write sequence from the guest
potentially races with qemu. Drop the write support and define these...
9c046d96 01/17/2011 05:29 pm Marcelo Tosatti

document QEMU<->ACPIBIOS PCI hotplug interface

Document how QEMU communicates with ACPI BIOS for PCI hotplug.

Signed-off-by: Marcelo Tosatti <>
Signed-off-by: Michael S. Tsirkin <>