On Thu, Apr 21, 2016 at 08:25:45AM -0700, Andy Lutomirski wrote:
> Didn't I?
Bah, I cut off the line which has the "=a" and then did the commenting.
Sorry about the noise.
> I thought about it, and there were two reasons:
>
> 1. I don't think we want to use __getcpu in the kernel. LSL is fairly
On Thu, Apr 21, 2016 at 5:16 AM, Borislav Petkov wrote:
> On Wed, Apr 20, 2016 at 06:16:01PM -0700, Andy Lutomirski wrote:
>> Also, it's time for someone to do UMIP. I'll see if I can convince
>> someone in KVM land to emulate it to make it easier to test.
>
> That'll be fun - we can simply set t
On Wed, Apr 20, 2016 at 06:16:01PM -0700, Andy Lutomirski wrote:
> Also, it's time for someone to do UMIP. I'll see if I can convince
> someone in KVM land to emulate it to make it easier to test.
That'll be fun - we can simply set that bit in CR4 and see who screams
:-P
> Changes from v1:
> -
RDPID is a new instruction that reads MSR_TSC_AUX quickly. This
should be considerably faster than reading the GDT. Add a
cpufeature for it and use it from __vdso_getcpu when available.
Signed-off-by: Andy Lutomirski
---
I don't have a Cannonlake CPU (or whatever CPU I'd need for this).
Could
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