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acpi_piix4: Disallow write to up/down PCI hotplug registers
authorAlex Williamson <alex.williamson@redhat.com>
Thu, 5 Apr 2012 17:07:08 +0000 (11:07 -0600)
committerMichael S. Tsirkin <mst@redhat.com>
Sun, 15 Apr 2012 09:17:22 +0000 (12:17 +0300)
commitba737541edddf9d0026460eb7b1d1c599b4c8ae9
tree46c6aeb0792aeb7cf0dc7ef404063d5cbf60d4d2tree | snapshot
parent2ba1d381c2f5f5868fe071b45977c2ed459d78f0commit | 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>
docs/specs/acpi_pci_hotplug.txt diff | blob | history
hw/acpi_piix4.c diff | blob | history
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