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KVM: arm64: Remove size-order align in the nVHE hyp private VA range

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commit f922c13e77 ("KVM: arm64: Introduce
pkvm_alloc_private_va_range()") and commit 92abe0f81e ("KVM: arm64:
Introduce hyp_alloc_private_va_range()") added an alignment for the
start address of any allocation into the nVHE hypervisor private VA
range.

This alignment (order of the size of the allocation) intends to enable
efficient stack verification (if the PAGE_SHIFT bit is zero, the stack
pointer is on the guard page and a stack overflow occurred).

But this is only necessary for stack allocation and can waste a lot of
VA space. So instead make stack-specific functions, handling the guard
page requirements, while other users (e.g.  fixmap) will only get page
alignment.

Reviewed-by: Kalesh Singh <kaleshsingh@google.com>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230811112037.1147863-1-vdonnefort@google.com
This commit is contained in:
Vincent Donnefort 2023-08-11 12:20:37 +01:00 • committed by Marc Zyngier
commit f156a7d13f
6 changed files with 138 additions and 85 deletions
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