* Thomas Gleixner wrote:
> On Mon, 21 Nov 2016, Peter Zijlstra wrote:
> > On Mon, Nov 21, 2016 at 09:16:44AM +0100, Thomas Gleixner wrote:
> > > On Sun, 20 Nov 2016, Peter Zijlstra wrote:
> > > > On Sat, Nov 19, 2016 at 01:47:37PM -, Thomas Gleixner wrote:
> > > > > When entering idle, it's
On Mon, 21 Nov 2016, Peter Zijlstra wrote:
> On Mon, Nov 21, 2016 at 09:16:44AM +0100, Thomas Gleixner wrote:
> > On Sun, 20 Nov 2016, Peter Zijlstra wrote:
> > > On Sat, Nov 19, 2016 at 01:47:37PM -, Thomas Gleixner wrote:
> > > > When entering idle, it's a good oportunity to verify that the T
Thomas Gleixner writes:
> When entering idle, it's a good oportunity to verify that the TSC_ADJUST
> MSR has not been tampered with (BIOS hiding SMM cycles). If tampering is
> detected, emit a warning and restore it to the previous value.
idle entry is a time critical code path too, because idle
On Mon, Nov 21, 2016 at 09:16:44AM +0100, Thomas Gleixner wrote:
> On Sun, 20 Nov 2016, Peter Zijlstra wrote:
> > On Sat, Nov 19, 2016 at 01:47:37PM -, Thomas Gleixner wrote:
> > > When entering idle, it's a good oportunity to verify that the TSC_ADJUST
> > > MSR has not been tampered with (BIO
On Sun, 20 Nov 2016, Peter Zijlstra wrote:
> On Sat, Nov 19, 2016 at 01:47:37PM -, Thomas Gleixner wrote:
> > When entering idle, it's a good oportunity to verify that the TSC_ADJUST
> > MSR has not been tampered with (BIOS hiding SMM cycles). If tampering is
> > detected, emit a warning and re
On Sat, Nov 19, 2016 at 01:47:37PM -, Thomas Gleixner wrote:
> When entering idle, it's a good oportunity to verify that the TSC_ADJUST
> MSR has not been tampered with (BIOS hiding SMM cycles). If tampering is
> detected, emit a warning and restore it to the previous value.
> +++ b/arch/x86/k
When entering idle, it's a good oportunity to verify that the TSC_ADJUST
MSR has not been tampered with (BIOS hiding SMM cycles). If tampering is
detected, emit a warning and restore it to the previous value.
This is especially important for machines, which mark the TSC reliable
because there is n
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