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>

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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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7

arch/x86/kernel/cpu/mshyperv.c

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2

include/linux/swiotlb.h

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45

kernel/dma/swiotlb.c

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