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arm64: fix documentation on kernel pages mappings to HYP VA

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The Documentation/arm64/memory.txt says:
When using KVM, the hypervisor maps kernel pages in EL2, at a fixed
offset from the kernel VA (top 24bits of the kernel VA set to zero):

In fact, kernel addresses are transleted to HYP with kern_hyp_va macro,
which has more options, and none of them assumes clearing of top 24bits
of the kernel VA.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
[will: removed gory details]
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Yury Norov 2017-09-13 21:08:30 +03:00 committed by Will Deacon
parent eef94a3d09
commit 9339fd348d
1 changed files with 5 additions and 5 deletions
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10
Documentation/arm64/memory.txt
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@ -86,9 +86,9 @@ Translation table lookup with 64KB pages:
+-------------------------------------------------> [63] TTBR0/1
When using KVM, the hypervisor maps kernel pages in EL2, at a fixed
offset from the kernel VA (top 24bits of the kernel VA set to zero):
When using KVM without the Virtualization Host Extensions, the hypervisor
maps kernel pages in EL2 at a fixed offset from the kernel VA. See the
kern_hyp_va macro for more details.
Start End Size Use
-----------------------------------------------------------------------
0000004000000000 0000007fffffffff 256GB kernel objects mapped in HYP
When using KVM with the Virtualization Host Extensions, no additional
mappings are created, since the host kernel runs directly in EL2.