KVM: arm64: Add guard pages for pKVM (protected nVHE) hypervisor stack

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Map the stack pages in the flexible private VA range and allocate
guard pages below the stack as unbacked VA space. The stack is aligned
so that any valid stack address has PAGE_SHIFT bit as 1 - this is used
for overflow detection (implemented in a subsequent patch in the series)

Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220420214317.3303360-5-kaleshsingh@google.com

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Kalesh Singh 2022-04-20 14:42:55 -07:00 • committed by Marc Zyngier

parent ce3354318a

commit 1a919b17ef

1 changed files with 28 additions and 3 deletions

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arch/arm64/kvm/hyp/nvhe/setup.c

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