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[PATCH v4 0/4 + v1 0/1] x86/spec-ctrl: IBPB improvements
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 14 Feb 2023 17:09:38 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 14 Feb 2023 16:10:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Versions of the two final patches were submitted standalone earlier
on. The series here tries to carry out a suggestion from Andrew,
which the two of us have been discussing. Then said previously posted
patches are re-based on top, utilizing the new functionality.
Xen:
1: spec-ctrl: add logic to issue IBPB on exit to guest
2: spec-ctrl: defer context-switch IBPB until guest entry
3: limit issuing of IBPB during context switch
4: PV: issue branch prediction barrier when switching 64-bit guest to kernel
mode
Linux (new):
1: x86/Xen: make use of IBPB controlling VM assist
Jan
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