On Mon, Jan 29, 2018 at 10:30:05AM -0800, H. Peter Anvin wrote:
On 01/29/18 10:26, Andy Lutomirski wrote:
That will utterly suck on non-UMIP machines that have hypervisor-provided UMIP emulation.
Is that a valid thing to optimize for, especially given that paranoid entries aren't the most common anyway?
A bunch of people seem to care about NMI performance for perf.
That wasn't really the question...
And the current patch set works without this trick.
But I believe the tricks it uses are fragile.
FWIW, if we switch all entries to the entry text trampoline, we get direct percpu access for free.
That might be a better option.
Has there been any conclusion to this thread? I can still reproduce the issue on mainline and next.
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