Messages in this thread | | | Subject | Re: [PATCH v4 11/15] pci: Add pci_iomap_shared{,_range} | From | "Kuppuswamy, Sathyanarayanan" <> | Date | Mon, 23 Aug 2021 17:30:54 -0700 |
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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@linux.intel.com> >> Signed-off-by: Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@linux.intel.com> > 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
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