Hi, Dave,
On Fri, Jun 26, 2020 at 11:23:12AM -0700, Dave Hansen wrote:
> On 6/26/20 11:10 AM, Luck, Tony wrote:
> > On Fri, Jun 26, 2020 at 11:44:50AM +0200, Peter Zijlstra wrote:
> >> On Thu, Jun 25, 2020 at 01:17:22PM -0700, Fenghua Yu wrote:
> >>
> >>> +static bool fixup_pasid_exception(void)
>
On 6/26/20 11:10 AM, Luck, Tony wrote:
> On Fri, Jun 26, 2020 at 11:44:50AM +0200, Peter Zijlstra wrote:
>> On Thu, Jun 25, 2020 at 01:17:22PM -0700, Fenghua Yu wrote:
>>
>>> +static bool fixup_pasid_exception(void)
>>> +{
>>> + if (!IS_ENABLED(CONFIG_INTEL_IOMMU_SVM))
>>> + return fals
Hi, Peter,
On Fri, Jun 26, 2020 at 11:44:50AM +0200, Peter Zijlstra wrote:
> On Thu, Jun 25, 2020 at 01:17:22PM -0700, Fenghua Yu wrote:
>
> > +static bool fixup_pasid_exception(void)
> > +{
> > + if (!IS_ENABLED(CONFIG_INTEL_IOMMU_SVM))
> > + return false;
> > + if (!static_cpu_has
On Fri, Jun 26, 2020 at 11:10:00AM -0700, Luck, Tony wrote:
> Do we have a standard way of coding for a feature that depends on multiple
> other features? For this case the system needs to both suport the ENQCMD
> instruction, and also have kernel code that programs the IOMMU.
Yes, you need both.
On Fri, Jun 26, 2020 at 11:44:50AM +0200, Peter Zijlstra wrote:
> On Thu, Jun 25, 2020 at 01:17:22PM -0700, Fenghua Yu wrote:
>
> > +static bool fixup_pasid_exception(void)
> > +{
> > + if (!IS_ENABLED(CONFIG_INTEL_IOMMU_SVM))
> > + return false;
> > + if (!static_cpu_has(X86_FEATURE
On Thu, Jun 25, 2020 at 01:17:22PM -0700, Fenghua Yu wrote:
> +static bool fixup_pasid_exception(void)
> +{
> + if (!IS_ENABLED(CONFIG_INTEL_IOMMU_SVM))
> + return false;
> + if (!static_cpu_has(X86_FEATURE_ENQCMD))
> + return false;
elsewhere you had another varia
Hi Fenghua,
On 2020/6/26 4:17, Fenghua Yu wrote:
A #GP fault is generated when ENQCMD instruction is executed without
a valid PASID value programmed in the current thread's PASID MSR. The
#GP fault handler will initialize the MSR if a PASID has been allocated
for this process.
Decoding the user
