[MODERATED] Re: [PATCH v6 5/9] TAAv6 5

[Pawan Gupta <pawan.kumar.gupta@linux.intel.com>]

On Thu, Oct 10, 2019 at 08:50:11AM +0200, speck for Greg KH wrote:
> On Wed, Oct 09, 2019 at 04:26:56PM -0700, speck for Pawan Gupta wrote:
> > Add the sysfs reporting file for TSX Async Abort. It exposes the
> > vulnerability and the mitigation state similar to the existing files for
> > the other hardware vulnerabilities.
> > 
> > sysfs file path is:
> > /sys/devices/system/cpu/vulnerabilities/tsx_async_abort
> > 
> > Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
> > Reviewed-by: Mark Gross <mgross@linux.intel.com>
> > Reviewed-by: Tony Luck <tony.luck@intel.com>
> > Tested-by: Neelima Krishnan <neelima.krishnan@intel.com>
> > ---
> >  arch/x86/kernel/cpu/bugs.c | 23 +++++++++++++++++++++++
> >  drivers/base/cpu.c         |  9 +++++++++
> >  include/linux/cpu.h        |  3 +++
> >  3 files changed, 35 insertions(+)
> > 
> > diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
> > index 0b7c7a826580..073687ddd06d 100644
> > --- a/arch/x86/kernel/cpu/bugs.c
> > +++ b/arch/x86/kernel/cpu/bugs.c
> > @@ -1451,6 +1451,21 @@ static ssize_t mds_show_state(char *buf)
> >  		       sched_smt_active() ? "vulnerable" : "disabled");
> >  }
> >  
> > +static ssize_t tsx_async_abort_show_state(char *buf)
> > +{
> > +	if ((taa_mitigation == TAA_MITIGATION_TSX_DISABLE) ||
> > +	    (taa_mitigation == TAA_MITIGATION_OFF))
> > +		return sprintf(buf, "%s\n", taa_strings[taa_mitigation]);
> > +
> > +	if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
> > +		return sprintf(buf, "%s; SMT Host state unknown\n",
> > +			       taa_strings[taa_mitigation]);
> > +	}
> > +
> > +	return sprintf(buf, "%s; SMT %s\n", taa_strings[taa_mitigation],
> 
> Shouldn't that be:
> 	return sprintf(buf, "%s: SMT %s\n", taa_strings[taa_mitigation],
> 
> Use a ':' and not a ';'

Oh, ';' is the separator between the main mitigation and the SMT status.

This is the sample output:

	"Mitigation: Clear CPU buffers; SMT vulnerable"
                                      ^
This follows the MDS nomenclature.

Thanks,
Pawan