Re: [Qemu-devel] [PATCH] acpi: Make TPM 2.0 with TIS available as MSFT0101

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Jan 28, 2019 at 03:45:53PM +0100, Igor Mammedov wrote:
> On Fri, 25 Jan 2019 16:00:58 -0500
> Stefan Berger <stefanb@linux.ibm.com> wrote:
> 
> > This patch makes the a TPM 2.0 with TIS interface available under the
> > HID 'MSF0101'. This is supported by Linux and also Windows now
> MSF0101 is relatively recent addition to Linux,
> are there in wild (old) kernels that worked with PNP0C31 but won't work
> with MSF0101?

Well what would you do? You either have TPM 2.0 or you don't.
If you have a 2.0 backend you need to expose it as 2.0
to the frontend right?

> > recognizes the TPM 2.0 with TIS interface. Leave the TPM 1.2 as before.
> > 
> > Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
> > ---
> >  hw/i386/acpi-build.c | 12 ++++++++++--
> >  1 file changed, 10 insertions(+), 2 deletions(-)
> > 
> > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > index 2e21a31f82..f51225b4a7 100644
> > --- a/hw/i386/acpi-build.c
> > +++ b/hw/i386/acpi-build.c
> > @@ -2141,8 +2141,16 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
> >              build_append_pci_bus_devices(scope, bus, pm->pcihp_bridge_en);
> >  
> >              if (TPM_IS_TIS(tpm)) {
> > -                dev = aml_device("ISA.TPM");
> > -                aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0C31")));
> > +                if (misc->tpm_version == TPM_VERSION_2_0) {
> > +                    dev = aml_device("TPM");
> > +                    aml_append(dev, aml_name_decl("_HID",
> > +                                                  aml_string("MSFT0101")));
> > +                } else {
> > +                    dev = aml_device("ISA.TPM");
> > +                    aml_append(dev, aml_name_decl("_HID",
> > +                                                  aml_eisaid("PNP0C31")));
> > +                }
> > +
> >                  aml_append(dev, aml_name_decl("_STA", aml_int(0xF)));
> >                  crs = aml_resource_template();
> >                  aml_append(crs, aml_memory32_fixed(TPM_TIS_ADDR_BASE,