On Mon, 8 Dec 2014 22:57:05 +0200
"Michael S. Tsirkin" <m...@redhat.com> wrote:
> On Mon, Dec 08, 2014 at 04:08:00PM +0000, Igor Mammedov wrote:
> > ACPI parser in XP considers PNP0A06 devices of CPU and
> > memory hotplug as duplicates. Adding unique _UID
> > to CPU hotplug device fixes BSOD.
> >
> > Signed-off-by: Igor Mammedov <imamm...@redhat.com>
>
> And let's add them for memory hotplug as well?
XP doesn't support it.
> Also, if we do stable branch release, we probably
> want to only do it for memory hotplug in a separate
> patch, right?
> This way users who don't enable memory hotplug
> are unaffected, reduces risk slightly.
Memory hotplug device already has _UID, so it doesn't need patching.
This patch just fixes BSOD if QEMU has been started with
hotplug enabled i.e. for example -m 2G,slots=2,maxmem=4G,
and prevents clashing between memory hotplug and
cpu hotplug devices on XP (i.e. XP specific quirk).
I've tested it with XPsp3 and all later version upto WS2012R2.
>
> > ---
> > hw/i386/acpi-dsdt-cpu-hotplug.dsl | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> > b/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> > index 34aab5a..268d870 100644
> > --- a/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> > +++ b/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> > @@ -94,6 +94,7 @@ Scope(\_SB) {
> >
> > Device(CPU_HOTPLUG_RESOURCE_DEVICE) {
> > Name(_HID, EisaId("PNP0A06"))
> > + Name(_UID, "CPU hotplug resources")
> >
> > Name(_CRS, ResourceTemplate() {
> > IO(Decode16, CPU_STATUS_BASE, CPU_STATUS_BASE, 0,
> > CPU_STATUS_LEN)
> > --
> > 1.8.3.1
