From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from [140.186.70.92] (port=47204 helo=eggs.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1Pch4R-0004BV-UM
	for qemu-devel@nongnu.org; Tue, 11 Jan 2011 11:29:25 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <mtosatti@redhat.com>) id 1Pch2Z-0002lU-Dv
	for qemu-devel@nongnu.org; Tue, 11 Jan 2011 11:27:35 -0500
Received: from mx1.redhat.com ([209.132.183.28]:51706)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <mtosatti@redhat.com>) id 1Pch2Z-0002lE-6Y
	for qemu-devel@nongnu.org; Tue, 11 Jan 2011 11:25:47 -0500
Received: from int-mx09.intmail.prod.int.phx2.redhat.com
	(int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22])
	by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id p0BGPjSd008854
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK)
	for <qemu-devel@nongnu.org>; Tue, 11 Jan 2011 11:25:46 -0500
Message-Id: <20110111162353.910330983@redhat.com>
Date: Tue, 11 Jan 2011 14:20:38 -0200
From: Marcelo Tosatti <mtosatti@redhat.com>
References: <20110111162037.699979125@redhat.com>
Content-Disposition: inline; filename=document-acpi-pci-hotplug
Subject: [Qemu-devel] [patch 1/2] document QEMU<->ACPIBIOS PCI hotplug
	interface
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>, qemu-devel@nongnu.org

Document how QEMU communicates with ACPI BIOS for PCI hotplug.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: qemu/docs/specs/acpi_pci_hotplug.txt
===================================================================
--- /dev/null
+++ qemu/docs/specs/acpi_pci_hotplug.txt
@@ -0,0 +1,39 @@
+QEMU<->ACPI BIOS PCI hotplug interface
+--------------------------------------
+
+QEMU supports PCI hotplug via ACPI, for PCI bus 0. This document
+describes the interface between QEMU and the ACPI BIOS.
+
+ACPI GPE block (IO ports 0xafe0-0xafe3, byte access):
+-----------------------------------------
+
+Generic ACPI GPE block. Bit 1 (GPE.1) used to notify PCI hotplug/eject
+event to ACPI BIOS, via SCI interrupt.
+
+PCI slot injection notification pending (IO port 0xae00-0xae03, 4-byte access):
+---------------------------------------------------------------
+Slot injection notification pending. One bit per slot.
+
+Read by ACPI BIOS GPE.1 handler to notify OS of injection
+events.
+
+PCI slot removal notification (IO port 0xae04-0xae07, 4-byte access):
+-----------------------------------------------------
+Slot removal notification pending. One bit per slot.
+
+Read by ACPI BIOS GPE.1 handler to notify OS of removal
+events.
+
+PCI device eject (IO port 0xae08-0xae0b, 4-byte access):
+----------------------------------------
+
+Used by ACPI BIOS _EJ0 method to request device removal. One bit per slot.
+Reads return 0.
+
+PCI removability status (IO port 0xae0c-0xae0f, 4-byte access):
+-----------------------------------------------
+
+Used by ACPI BIOS _RMV method to indicate removability status to OS. One
+bit per slot.
+
+