On Wed, Oct 10, 2012 at 12:32:50AM +0200, Andre Przywara wrote:
> On 10/09/2012 05:51 PM, Konrad Rzeszutek Wilk wrote:
> >On Tue, Oct 09, 2012 at 05:38:34PM +0200, Andre Przywara wrote:
> >>In check_hw_exists() we try to detect non-emulated MSR accesses
> >>by writing an arbitrary value into one of
On 10/09/2012 05:51 PM, Konrad Rzeszutek Wilk wrote:
On Tue, Oct 09, 2012 at 05:38:34PM +0200, Andre Przywara wrote:
In check_hw_exists() we try to detect non-emulated MSR accesses
by writing an arbitrary value into one of the PMU registers
and check if it's value after a readout is still the sa
On Tue, Oct 09, 2012 at 05:38:34PM +0200, Andre Przywara wrote:
> In check_hw_exists() we try to detect non-emulated MSR accesses
> by writing an arbitrary value into one of the PMU registers
> and check if it's value after a readout is still the same.
> This algorithm silently assumes that the reg
On Tue, 2012-10-09 at 17:38 +0200, Andre Przywara wrote:
> First you need an AMD family 10h/12h CPU. These do not reset the
> PERF_CTR registers on a reboot.
> Now you boot bare metal Linux, which goes successfully through this
> check, but leaves the magic value of 0xabcd in the register. You
> do
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