Bug 243979 - PV-on-HVM interrupts not delivered promptly in APIC mode
PV-on-HVM interrupts not delivered promptly in APIC mode
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel-xen (Show other bugs)
5.0
All Linux
low Severity low
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Assigned To: Rik van Riel
Martin Jenner
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Depends On:
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Reported: 2007-06-13 02:42 EDT by Herbert Xu
Modified: 2007-11-30 17:07 EST (History)
1 user (show)

See Also:
Fixed In Version: RHBA-2007-0959
Doc Type: Bug Fix
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Last Closed: 2007-11-07 14:53:06 EST
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Description Herbert Xu 2007-06-13 02:42:16 EDT
The delivery of PV-on-HVM interrupts are broken in APIC mode.  When the guest is
woken up it fails to inject an interrupt immediately into it.  Therefore the
interrupt is only delivered when the next interrupt (usually a timer interrupt)
is injected.

Booting with noapic cures the problem.  The problem is also fixed in Xen 3.1.
Comment 1 Rik van Riel 2007-06-13 09:38:56 EDT
We should be fine for RHEL 5.1 then, since we are upgrading the hypervisor to 
version 3.1.
Comment 2 Rik van Riel 2007-06-29 14:28:09 EDT
The Xen 3.1.0 hypervisor got merged in 2.6.18-29.el5.
Comment 3 Red Hat Bugzilla 2007-07-24 20:51:50 EDT
change QA contact
Comment 6 errata-xmlrpc 2007-11-07 14:53:06 EST
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2007-0959.html

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