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
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 the PMU
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
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
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
>
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 register does not contain
the magic value already, which is wrong in at
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 register does not contain
the magic value already, which is wrong in at
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 register does not contain
the magic value already, which is wrong in at
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 register does not contain
the magic value already, which is wrong in at
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
don't
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
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
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