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Bug 637658

Summary: [RHEL 4.8] 32-bit pvhvm guest on 64-bit host crash w/xm mem-set
Product: Red Hat Enterprise Linux 4 Reporter: Lei Wang <leiwang>
Component: kernel-xenAssignee: Radim Krčmář <rkrcmar>
Status: CLOSED ERRATA QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: low    
Version: 4.8CC: drjones, jarod, jlv, leiwang, mjenner, mshao, pbonzini, xen-maint, yuzhang
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 605697 Environment:
Last Closed: 2011-02-16 16:06:23 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: 605697    
Bug Blocks: 458302, 605694    
Attachments:
Description Flags
Prevent crashing of x86 guest on x86_64 host by checking for -ENOSYS first. none

Comment 2 Radim Krčmář 2010-09-27 12:25:02 UTC 
Created attachment 449875 [details]
Prevent crashing of x86 guest on x86_64 host by checking for -ENOSYS first.

The ballooning driver has not changed much between rhel4 and rhel5 kernels, so this patch is has only different line numbers compared to patch for bug 605697.
Comment 3 RHEL Program Management 2010-10-12 17:50:49 UTC 
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.
Comment 4 Vivek Goyal 2010-10-14 14:43:42 UTC 
Committed in 89.43.EL . RPMS are available at http://people.redhat.com/vgoyal/rhel4/
Comment 8 Yufang Zhang 2011-01-07 05:31:45 UTC 
QA verified this bug with -94 kernel:

Reproduce this bug with -89 kernel:
Try to change memory size of 32bit HVM guest on 64bit host, the guest would crash. 

With -94 kernel in the guest, doing the same steps would not trigger crashing, although the guest memory size wouldn't change as requested. I think it is expected, as the patch shows:

+	ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
+	switch (ret) {
+	case 0:
+		return 1;
+	case -ENOSYS:
+	default:
+		WPRINTK("ballooning: changing reservation is not supported\n");
+		return 0;
+	}
+}
 

So change this bug to VERIFIED.
Comment 9 errata-xmlrpc 2011-02-16 16:06:23 UTC 
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 therefore 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/RHSA-2011-0263.html