diff options
| author | Alex Williamson <alex.williamson@redhat.com> | 2012-04-05 11:07:08 -0600 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2012-04-15 12:17:22 +0300 |
| commit | ba737541edddf9d0026460eb7b1d1c599b4c8ae9 (patch) | |
| tree | 46c6aeb0792aeb7cf0dc7ef404063d5cbf60d4d2 /docs | |
| parent | 2ba1d381c2f5f5868fe071b45977c2ed459d78f0 (diff) | |
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
as read-only registers.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/specs/acpi_pci_hotplug.txt | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/docs/specs/acpi_pci_hotplug.txt b/docs/specs/acpi_pci_hotplug.txt index f0f74a7c7c..1e2c8a22eb 100644 --- a/docs/specs/acpi_pci_hotplug.txt +++ b/docs/specs/acpi_pci_hotplug.txt @@ -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): ---------------------------------------- |