tree bc97c67e5bdca872452c3ab163954de436404fc3
parent 0c09fe0847ee842c8a0b421b23569e190e9ceff9
author Will Deacon <will@kernel.org> 1635347245 +0100
committer Will Deacon <will@kernel.org> 1638373699 +0000

irqchip/gic-v3-its: Mark some in-memory data structures as 'decrypted'

The GICv3 ITS driver allocates memory for its tables using alloc_pages()
and performs explicit cache maintenance if necessary. On systems such
as those running pKVM, where the memory encryption API is implemented,
memory shared with the ITS must first be transitioned to the "decrypted"
state, as it would be if allocated via the DMA API.

Allow pKVM guests to interact with an ITS emulation by ensuring that the
shared pages are decrypted at the point of allocation and encrypted
again upon free().

Signed-off-by: Will Deacon <will@kernel.org>