Bug 738632 - Windows 2008 doesnt detect KVM serial port
Summary: Windows 2008 doesnt detect KVM serial port
Alias: None
Product: Fedora
Classification: Fedora
Component: qemu
Version: 15
Hardware: x86_64
OS: Windows
Target Milestone: ---
Assignee: Fedora Virtualization Maintainers
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2011-09-15 12:33 UTC by mathias
Modified: 2013-01-10 00:20 UTC (History)
16 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2012-07-08 23:53:05 UTC

Attachments (Terms of Use)

Description mathias 2011-09-15 12:33:21 UTC
Description of problem:

Win 2008 R2 (tested with and without SP1) doesnt detect qemu/kvm's virtual serial ports (neither default pty nor "real" physical host tty port)

Version-Release number of selected component (if applicable):

fedora 15 (host)
ms windows server 2008 r2 (guest)

How reproducible:

Steps to Reproduce:
1. create a vm using virt-manager install windows 2008 r2 and boot
2. look for serial port (there should be one, the default pty port)
3. manually try to add serial port using device manager -> add legay hardware
Actual results:

error code 34, resources are already in use
I/O address 0x3F8 is already in use by "PCI-Bus"
IRQ 4 is already in use by "ACPI x64-based PC"

Expected results:

a just-working com port;-)

Additional info:

windows seems not detecting the com port because the i/o address and irq is already in use, but why? i think those addresses are default for first COM port! if i boot linux in that VM, the com port works using exactly those address and irq!

Comment 1 mathias 2011-09-16 12:24:39 UTC
i have found a way to force windows using default I/O address and IRQ by disabling "auto config" under device-manager->serial-port (manually created) -> ressources.

after that you have to reboot and -> IT WORKS!!!

but why auto-detection doesn't work by default is still very strange...

now there is still bug 596553 (https://bugzilla.redhat.com/show_bug.cgi?id=596553) with that "opening backend tty failed" error but this is another story and there also is a workaround....

Comment 2 Fedora Admin XMLRPC Client 2012-03-15 17:54:06 UTC
This package has changed ownership in the Fedora Package Database.  Reassigning to the new owner of this component.

Comment 3 Cole Robinson 2012-05-29 00:38:42 UTC
F15 is end of life in a month. Mathias, are you seeing this issue on a more recent fedora? If so we can follow up from there.

Comment 4 Cole Robinson 2012-07-08 23:53:05 UTC
F15 is end of life now, so closing. Please reopen if you still see this with F16 or later

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