Re: [PATCH v2 02/12] x86/ioapic: Gate decrypted mapping on cc_platform_has() attribute

Dave Hansen
2022-11-12T00:21:58Z

On 11/10/22 22:21, Michael Kelley wrote:
> * Ensure fixmaps for IOAPIC MMIO respect memory encryption pgprot
> * bits, just like normal ioremap():
> */
> - flags = pgprot_decrypted(flags);
> + if (!cc_platform_has(CC_ATTR_HAS_PARAVISOR))
> + flags = pgprot_decrypted(flags);

This begs the question whether *all* paravisors will want to avoid a
decrypted ioapic mapping. Is this _fundamental_ to paravisors, or it is
an implementation detail of this _individual_ paravisor?