Re: [PATCH V1 3/6] xen/virtio: Add option to restrict memory access under Xen

From: Boris Ostrovsky
Date: Sun Apr 24 2022 - 14:11:00 EST

On 4/24/22 12:53 PM, Oleksandr wrote:

On 23.04.22 19:40, Christoph Hellwig wrote:

+int arch_has_restricted_virtio_memory_access(void)
+    return (xen_has_restricted_virtio_memory_access() ||
+            cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT));
So instead of hardcoding Xen here, this seems like a candidate for
another cc_platform_has flag.

I have a limited knowledge of x86 and Xen on x86.

Would the Xen specific bits fit into Confidential Computing Platform checks? I will let Juergen/Boris comment on this.

This is unrelated to confidential so I don't think we can add another CC_ flag.

Would arch/x86/kernel/cpu/hypervisor.c be a better home for this?