Bug 732752
Summary: | exclude VMX_PROCBASED_CTL2 from the MSRs a VMX guest is allowed to access | ||||||
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Product: | Red Hat Enterprise Linux 5 | Reporter: | Paolo Bonzini <pbonzini> | ||||
Component: | kernel-xen | Assignee: | Paolo Bonzini <pbonzini> | ||||
Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> | ||||
Severity: | unspecified | Docs Contact: | |||||
Priority: | unspecified | ||||||
Version: | 5.7 | CC: | drjones, imammedo, leiwang, lersek, mrezanin, pmatouse, qguan, qwan | ||||
Target Milestone: | rc | ||||||
Target Release: | --- | ||||||
Hardware: | Unspecified | ||||||
OS: | Unspecified | ||||||
Whiteboard: | |||||||
Fixed In Version: | kernel-2.6.18-284.el5 | Doc Type: | Bug Fix | ||||
Doc Text: | Story Points: | --- | |||||
Clone Of: | Environment: | ||||||
Last Closed: | 2012-02-21 03:53:36 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: | 514490 | ||||||
Attachments: |
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Description
Paolo Bonzini
2011-08-23 13:49:04 UTC
The MSR write ultimately becomes a no-op, while other VMX registers fail and inject a #GP in the guest (the #GP in turn is trapped if using wrmsr_safe and becomes an EFAULT). Created attachment 519794 [details]
test module
The test module should print "failed" twice.
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. Patch(es) available in kernel-2.6.18-284.el5 You can download this test kernel (or newer) from http://people.redhat.com/jwilson/el5 Detailed testing feedback is always welcomed. Patch(es) available in kernel-2.6.18-284.el5 You can download this test kernel (or newer) from http://people.redhat.com/jwilson/el5 Detailed testing feedback is always welcomed. Verified with kernel-xen-2.6.18-300.el5. On the 5.7 GA kernel host, insmod the module in comment 2 within HVM guests(RHEL5.7 i386, x86_64 and RHEL6.1 i386), got the following messages in dmesg: $ dmesg Check MSR write failed -14 MSR write succeeded 0 After update host to kernel-xen-2.6.18-300.el5, got the following messages: $ dmesg Check MSR write failed -14 MSR write failed -14 Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2012-0150.html |