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acpi_piix4: Disallow write to up/down PCI hotplug registers

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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
as read-only registers.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Williamson 2012-04-05 11:07:08 -06:00 • committed by Michael S. Tsirkin
parent 2ba1d381c2
commit ba737541ed
2 changed files with 15 additions and 31 deletions
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4
docs/specs/acpi_pci_hotplug.txt
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@ -15,14 +15,14 @@ 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.
events. Read-only.
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.
events. Read-only.
PCI device eject (IO port 0xae08-0xae0b, 4-byte access):
----------------------------------------