Re: [Qemu-devel] OVMF, Q35 and USB keyboard/mouse

["Gabriel L. Somlo" <gsomlo@gmail.com>]

On Fri, Sep 12, 2014 at 11:17:35AM +0200, BALATON Zoltan wrote:
> On Thu, 11 Sep 2014, Gabriel L. Somlo wrote:
> >On Thu, Sep 11, 2014 at 11:34:03PM +0200, Alexander Graf wrote:
> >>XNU also populates its device tree based on the DSDT. Maybe there's a
> >>subtle difference there?
> >
> >This was the low hanging fruit, so I checked it first :) Pulled the
> >DSDT using the OS X version of "DSDTEditor" (found on insanelymac)
> >on both the Chameleon q35 version which had all three UHCIs and from
> >the OVMF q35 version which only showed UHCI3. The two DSDTs looked
> >absolutely identical (no output from diff)...
> 
> You may also look for differences in USB devices in the ouput of ioreg.
> Maybe that shows something. (It's basically what you can see in System
> Profiler but easier to compare with diff and may have additional data.)

Other than lots of off-by-a-few key values, the main two hunks of the
diff between the Chameleon and OVMF instances of a Q35 OSX guest are
simply the missing two "AppleUSBUHCI" arrays:

-	<key>IORegistryEntryChildren</key>
-	<array>
-		<dict>
-			<key>CFBundleIdentifier</key>
-			<string>com.apple.driver.AppleUSBUHCI</string>
-			<key>Card Type</key>
-			<string>PCI</string>
-			<key>Companion</key>
-			<string>yes</string>
-			<key>Errata</key>
-			<integer>0</integer>
-			<key>IOClass</key>
-			<string>AppleUSBUHCI</string>
-			<key>IOMatchCategory</key>
-			<string>IODefaultMatchCategory</string>
-			<key>IOObjectClass</key>
-			<string>AppleUSBUHCI</string>
-			<key>IOObjectRetainCount</key>
-			<integer>11</integer>
-			<key>IOPCIClassMatch</key>
-			<string>0x0C030000</string>
-			<key>IOPowerManagement</key>
-			<dict>
-				<key>ChildrenPowerState</key>
-				<integer>3</integer>
-				<key>CurrentPowerState</key>
-				<integer>3</integer>
-				<key>DevicePowerState</key>
-				<integer>3</integer>
-				<key>DriverPowerState</key>
-				<integer>3</integer>
-				<key>MaxPowerState</key>
-				<integer>4</integer>
-			</dict>
-			<key>IOProbeScore</key>
-			<integer>0</integer>
-			<key>IOProviderClass</key>
-			<string>IOPCIDevice</string>
-			<key>IORegistryEntryChildren</key>
-			<array>
-				<dict>
-					<key>AAPL,current-extra-in-sleep</key>
-					<integer>500</integer>
... etc.

Together, the ioreg xml output files are 50K lines, so I figured I'd
try to spare everyone the pain (but I do have them and can attach them
in private mail in case you think they're worth a second look).

Thanks,
--Gabriel