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    SubjectRe: [PATCH 09/18] iommu/vt-d: Enlightened PASID allocation
    On Tue, 9 Apr 2019 13:08:59 +0300
    Andriy Shevchenko <andriy.shevchenko@linux.intel.com> wrote:

    > On Mon, Apr 08, 2019 at 04:59:24PM -0700, Jacob Pan wrote:
    > > From: Lu Baolu <baolu.lu@linux.intel.com>
    > >
    > > If Intel IOMMU runs in caching mode, a.k.a. virtual IOMMU, the
    > > IOMMU driver should rely on the emulation software to allocate
    > > and free PASID IDs. The Intel vt-d spec revision 3.0 defines a
    > > register set to support this. This includes a capability register,
    > > a virtual command register and a virtual response register. Refer
    > > to section 10.4.42, 10.4.43, 10.4.44 for more information.
    > >
    > > This patch adds the enlightened PASID allocation/free interfaces
    > > via the virtual command register.
    >
    > > + pr_debug("vcmd alloc pasid\n");
    >
    > Perhaps tracepoints should be in use?
    > OTOH we have function tracer, so, this message in any case is a noise.
    > And this is applicable to other similar cases.
    >

    Agreed, I added that for debug purpose.

    Thanks,

    Jacob

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