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SubjectRe: [PATCH] x86/speculation: Add document to describe Spectre and its mitigations

On 12/21/2018 05:17 PM, Tim Chen wrote:
> On 12/21/18 1:59 PM, Ben Greear wrote:
>> On 12/21/18 9:44 AM, Tim Chen wrote:
>>> Thomas,
>>> Andi and I have made an update to our draft of the Spectre admin guide.
>>> We may be out on Christmas vacation for a while. But we want to
>>> send it out for everyone to take a look.
>> Can you add a section on how to compile out all mitigations that have anything
>> beyond negligible performance impact for those running systems where performance
>> is more important than security?
> If you don't worry about security and performance is paramount, then
> boot with "nospectre_v2". That's explained in the document.

There seem to be lots of different variants of this type of problem. It was not clear
to me that just doing nospectre_v2 would be sufficient to get back full performance.

And anyway, I would like to compile the kernel to not need that command-line option,
so I am still interesting in what compile options need to be set to what values...


Ben Greear <>
Candela Technologies Inc

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