Bug 218822
Summary: | PAE 4GB bug in hypervisor when using HVM guests with > 4 GB ram | ||
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Product: | Red Hat Enterprise Linux 5 | Reporter: | Daniel Berrangé <berrange> |
Component: | xen | Assignee: | Xen Maintainance List <xen-maint> |
Status: | CLOSED ERRATA | QA Contact: | |
Severity: | medium | Docs Contact: | |
Priority: | medium | ||
Version: | 5.0 | ||
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | i386 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | RHEA-2007-0635 | Doc Type: | Bug Fix |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2007-11-07 17:08:57 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: | |||
Bug Depends On: | |||
Bug Blocks: | 218820 |
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release. Switching to MODIFIED since we got the patch in changeset 12732 for free as part of the 3.1 hypervisor/qemu rebase. 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/RHEA-2007-0635.html |
Description of problem: See upstream changeset 12732. The following is a note about it from Tim Deegan: [quote] > changeset: 12732:7df4d8cfba3b2fbd12ac1f287ab854ff4b242721 > user: Tim Deegan <Tim.Deegan> > date: Tue Dec 05 12:42:29 2006 +0000 > files: xen/arch/x86/mm/shadow/common.c > description: > [XEN] sh_gfn_to_mfn_foreign() must handle guest pfns above 4GB on PAE > Signed-off-by: Tim Deegan <Tim.Deegan> > > > And wondered if you had any further information about the problems we'd see > without this patch. Would it simply be psuedo-random crashes of the guest, > or would the HV itself crash ? And is there any easy way to reproduce the > problem for testing For translated PAE guests on PAE hosts, where the guest has more than 4GB of RAM, you would see memory corruption within the guest, but not Xen crashes. Since without Intel's map-cache patch we can't start HVM guests with more than 2GB of RAM on PAE anyway, it's not been a problem. The Intel developers working on the map-cache patch reported it; I don't know what particular symptoms they were seeing. Potentially this could cause memory corruption in translated-mode PV guests (i.e. paravirt-ops kernels) with more than 4GB of RAM; I've not been testing that case. [/quote] Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info: