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swiotlb: Remove bounce buffer remapping for Hyper-V

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With changes to how Hyper-V guest VMs flip memory between private
(encrypted) and shared (decrypted), creating a second kernel virtual
mapping for shared memory is no longer necessary. Everything needed
for the transition to shared is handled by set_memory_decrypted().

As such, remove swiotlb_unencrypted_base and the associated
code.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/1679838727-87310-8-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Michael Kelley
2023-03-26 06:52:02 -07:00
committed by Wei Liu
parent 21eb596fce
commit 0459ff4873
3 changed files with 2 additions and 52 deletions
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2
include/linux/swiotlb.h
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@@ -180,6 +180,4 @@ static inline bool is_swiotlb_for_alloc(struct device *dev)
}
#endif /* CONFIG_DMA_RESTRICTED_POOL */
extern phys_addr_t swiotlb_unencrypted_base;
#endif /* __LINUX_SWIOTLB_H */