On 8/23/21 4:56 PM, Michael S. Tsirkin wrote:
Add a new variant of pci_iomap for mapping all PCI resources
of a devices as shared memory with a hypervisor in a confidential
guest.
Signed-off-by: Andi Kleen<ak@xxxxxxxxxxxxxxx>
Signed-off-by: Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
I'm a bit puzzled by this part. So why should the guest*not* map
pci memory as shared? And if the answer is never (as it seems to be)
then why not just make regular pci_iomap DTRT?
It is in the context of confidential guest (where VMM is un-trusted). So
we don't want to make all PCI resource as shared. It should be allowed
only for hardened drivers/devices.
--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer
