Re: [PATCH v3 12/13] PCI/TSM: support TDI related operations for host TSM driver

[Xu Yilun <yilun.xu@linux.intel.com>]

On Thu, May 15, 2025 at 10:47:31PM -0700, Dan Williams wrote:
> From: Xu Yilun <yilun.xu@linux.intel.com>
> 
> Add kAPIs pci_tsm_{bind,unbind,guest_req}() for PCI devices.
> 
> pci_tsm_bind/unbind() are supposed to be called by kernel components
> which manages the virtual device. The verb 'bind' means VMM does extra
> configurations to make the assigned device ready to be validated by
> CoCo VM as TDI (TEE Device Interface). Usually these configurations
> include assigning device ownership and MMIO ownership to CoCo VM, and
> move the TDI to CONFIG_LOCKED TDISP state by LOCK_INTERFACE_REQUEST
> TDISP message. The detailed operations are specific to platform TSM
> firmware so need to be supported by vendor TSM drivers.
> 
> pci_tsm_guest_req() supports a channel for CoCo VM to directly talk
> to TSM firmware about further TDI operations after TDI is bound, e.g.
> get device interface report, certifications & measurements. So this kAPI
> is supposed to be called from KVM vmexit handler.

To clarify, this commit message is staled. We are proposing existing to
QEMU, then pass to TSM through IOMMUFD VDEVICE.

Thanks,
Yilun