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docs: Extend the list of TDX guest limitations

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Adding a new limitation related to the TDX guest kernel as it doesn't
allow for most ACPI devices, meaning the PCI hotplug through ACPI isn't
supported unless we use 'tdx_disable_filter' boot parameter.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
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Sebastien Boeuf
2022-07-26 16:56:14 +02:00
parent f8f0b40e94
commit f4e2198767
1 changed files with 12 additions and 2 deletions
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docs/intel_tdx.md
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@@ -103,8 +103,18 @@ option as well.
--disk path=tdx_guest_img --disk path=tdx_guest_img
``` ```
### Guest kernel disables serial ports ### Guest kernel limitations
#### Serial ports disabled
The latest guest kernel that can be found in the latest image The latest guest kernel that can be found in the latest image
`td-guest-rhel8.5.raw` disabled the support for serial ports. This means adding `td-guest-rhel8.5.raw` disabled the support for serial ports. This means adding
`console=ttyS0` will have no effect and will not print any log from the guest. `console=ttyS0` will have no effect and will not print any log from the guest.
#### PCI hotplug through ACPI
Unless you run the guest kernel with the parameter `tdx_disable_filter`, ACPI
devices responsible for handling PCI hotplug (PCI hotplug controller, PCI
Express Bus and Generic Event Device) will not be allowed, therefore the
corresponding drivers will not be loaded and the PCI hotplug feature will not
be supported.