[Qemu-devel] Re: PATCH: document QEMU<->ACPIBIOS PCI hotplug interface (v2)

[Avi Kivity <avi@redhat.com>]

On 12/21/2010 04:41 PM, Marcelo Tosatti wrote:
> 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 0xafe0-0xafe3):
> +-----------------------------------------
> +
> +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.
> +
> +

Do we support byte and word access to those ports, or just dword access?

With this documentation, I'm fine with the _RMV DSDT patch.

-- 
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