| Date | Mon, 4 Mar 2019 16:55:05 -0500 | From | Konrad Rzeszutek Wilk <> | Subject | Re: [PATCH v4 00/17] x86/split_lock: Enable #AC exception for split locked accesses |
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> This capability may also find usage in cloud. A user process with split > lock running in one guest can block other cores from accessing shared > memory during its split locked memory access. That may cause overall > system performance degradation.
"shared memory" ? As in memory shared between two guests?
> > Split lock may open a security hole where malicious user code may slow > down overall system by executing instructions with split lock.
How much slowdown are we talking?
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