Xen Project Meltdown and Spectre Technical FAQ: Difference between revisions
Lars.kurth (talk | contribs) |
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Released: |
Released: |
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* '''Vixen''' (see [http://xenbits.xen.org/xsa/advisory-254.html XSA-254]) |
* '''Vixen''' (see [http://xenbits.xen.org/xsa/advisory-254.html XSA-254]) |
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* '''Comet''' (see [http://xenbits.xen.org/xsa/advisory-254.html XSA-254]) - only for Xen 4.10 |
* '''Comet''' (see [http://xenbits.xen.org/xsa/advisory-254.html XSA-254]) - only for Xen 4.10 and 4.8 |
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Development versions (older and ongoing): |
Development versions (older and ongoing): |
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Revision as of 08:33, 17 January 2018
What is the plan going forward?
It is still emerging, but we are looking at
- Short Term Plan v2
- Short Term Plan v1 (superseded by v2)
Where can I find the current patch series that fixes Meltdown/SP3
For guests with legacy PV kernels which cannot be run in HVM or PVH mode directly, we have developed two "shim" hypervisors that allow PV guests to run in HVM mode or PVH mode. The HVM shim (codenamed "Vixen") is available now (please refer to XSA-254 for more details). We expect to have the PVH shim (codenamed "Comet") available within a few days.
Released:
Development versions (older and ongoing):
- Comet: Run PV in PVH container (Citrix)
- Vixen: A PV-in-HVM shim (Amazon)
- x86: initial simplistic Meltdown mitigation
- Note that newer versions of these patches appear at high velocity: please always check the xen-devel@ archives for the latest version
Note the following comment in the Vixen series: This series is very similar to the PVH series posted by Wei and we have been discussing how to merge efforts. We were hoping to have more time to work this out. I am posting this because I'm fairly confident that this series is complete (all PV instances in EC2 are using this) and others might find it useful. I also wanted to have more of a discussion about the best way to merge and some of the differences in designs.
Other related patches under discussion
- x86: Prerequisite work for a Xen KAISER solution - These patches are presented to start a discussion of the issues and to inform the decision on how to fix the issue for older Xen releases. The series as a whole is not in a suitable state for committing.
Where can I find the current patch series that fixes Spectre/SP2
See
- x86: Mitigations for SP2/CVE-2017-5715/Branch Target Injection
- xen/arm64: Branch predictor hardening (XSA-254 variant 2)
- Note that newer versions of these patches appear at high velocity: please always check the xen-devel@ archives for the latest version
Are there any other documents I should read?
See Respond to Meltdown and Spectre, Blog FAQ and xen-devel@ thread
