From: Marcelo Tosatti <mtosatti@redhat.com>
To: qemu-devel@nongnu.org
Cc: Avi Kivity <avi@redhat.com>, Gleb Natapov <gleb@redhat.com>
Subject: [Qemu-devel] document QEMU<->ACPIBIOS PCI hotplug interface
Date: Mon, 20 Dec 2010 15:09:17 -0200 [thread overview]
Message-ID: <20101220170917.GA30684@amt.cnet> (raw)
In-Reply-To: <20101208171136.GA10213@amt.cnet>
Document how QEMU communicates with ACPI BIOS
for PCI hotplug.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
--- /dev/null 2010-12-14 09:23:48.414180082 -0200
+++ qemu/docs/specs/acpi_pci_hotplug.txt 2010-12-20 15:00:26.000000000 -0200
@@ -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 0xafe00-0xafe04):
+-----------------------------------------
+
+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):
+---------------------------------------------------------------
+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):
+-----------------------------------------------------
+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):
+----------------------------------------
+
+Used by ACPI BIOS _EJ0 method to request device removal. One bit per slot.
+Reads return 0.
+
+PCI removability status (IO port 0xae0c-0xae0f):
+-----------------------------------------------
+
+Used by ACPI BIOS _RMV method to indicate removability status to OS. One
+bit per slot.
+
+
next prev parent reply other threads:[~2010-12-20 17:36 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-08 17:11 [Qemu-devel] acpi_piix4: expose no_hotplug attribute via i/o port Marcelo Tosatti
2010-12-20 17:09 ` Marcelo Tosatti [this message]
2010-12-20 20:11 ` [Qemu-devel] document QEMU<->ACPIBIOS PCI hotplug interface Blue Swirl
2010-12-21 14:39 ` Marcelo Tosatti
2010-12-21 14:41 ` [Qemu-devel] PATCH: document QEMU<->ACPIBIOS PCI hotplug interface (v2) Marcelo Tosatti
2010-12-21 14:50 ` [Qemu-devel] " Avi Kivity
2011-01-05 16:00 ` [Qemu-devel] Re: acpi_piix4: expose no_hotplug attribute via i/o port Michael S. Tsirkin
2011-01-05 16:02 ` Michael S. Tsirkin
2011-01-05 19:32 ` Michael S. Tsirkin
2011-01-06 18:48 ` Marcelo Tosatti
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